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Dr. Hendri Widiyandari
Physics Department-Faculty of Mathematics and Natural Sciences-Sebelas Maret University

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0 Physics and Chemistry of Solid State
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Journal article
Published: 01 July 2021 in International Journal of Engineering
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A large amount of sludge is produced by the geothermal brine at the Dieng Geothermal power plant, exceeding 165 tons per month. This sludge is generally not utilized, except for use in landfills. The precipitate (sludge) is primarily composed of silica. The aim of this research is to synthesis mesoporous silica (SiO2) xerogel from geothermal sludge (GS) and to investigate the effects of pH as an effort to elevate the economic value of sludge through alkaline extraction followed by acidification. SiO2 xerogel was prepared by extracting the GS to become sodium silicate (Na2SiO3) assisted by a base NaOH and precipitated using H2SO4 as a gelation agent. The FTIR analysis of the SiO2 xerogel showed a group of silanol (Si-OH) and siloxane (Si-O-Si). The XRD analysis indicated that SiO2 xerogel was amorphous. Furthermore, it was observed from nitrogen absorption-desorption using BET (Breneur-Emmet-Teller) method test that decreased pH tends to the specific surface area increase, and the pore size becomes decrease. The largest specific surface area observed at SiO2 xerogel prepared at pH of 5.5 reached 400.10 m2/g with a pore size of 4.5 nm. The pore sized for all cases was in the range of 4 ~12 nm, indicating that the SiO2 xerogels were mesoporous. Pore size of the as-prepared silica affected the thermal stability property of the sample.

ACS Style

H. Widiyandari; P. Pardoyo; J. Sartika; O. A. Putra; A. Purwanto; L. Ernawati. Synthesis of Mesoporous Silica Xerogel from Geothermal Sludge using Sulfuric Acid as Gelation Agent. International Journal of Engineering 2021, 34, 1569 -1575.

AMA Style

H. Widiyandari, P. Pardoyo, J. Sartika, O. A. Putra, A. Purwanto, L. Ernawati. Synthesis of Mesoporous Silica Xerogel from Geothermal Sludge using Sulfuric Acid as Gelation Agent. International Journal of Engineering. 2021; 34 (7):1569-1575.

Chicago/Turabian Style

H. Widiyandari; P. Pardoyo; J. Sartika; O. A. Putra; A. Purwanto; L. Ernawati. 2021. "Synthesis of Mesoporous Silica Xerogel from Geothermal Sludge using Sulfuric Acid as Gelation Agent." International Journal of Engineering 34, no. 7: 1569-1575.

Conference paper
Published: 01 February 2021 in Journal of Physics: Conference Series
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A battery is a cell device that can store energy and be converted into a constant voltage. Overcharging and over-discharging conditions on the battery are often a problem. This research designed a Battery Management System (BMS) to monitor battery performance with an automatic Cut Off system. The prototype system uses a voltage divider circuit in the voltage measurement process, one channel relay as the process of cutting off the electric current and Arduino UNO microcontroller as a data processor. Testing on five cell LiFePO4 (LFP) 3.2 volt battery with 1200 mAh capacity using the charging and discharging method in measuring the battery voltage. The results of measuring the voltage in the charging process take 2 hours 25 minutes to reach a voltage of 3.26 V obtained an average error value of each cell measurement of 0.44%. While the discharging process, to reach the voltage of 2.00 V, required an emptying time of 7 hours 15 minutes for output without step-up and 2 hours 46 minutes for the output with step-up obtained an average measurement error value of each cell 1.11% and 1.39%.

ACS Style

Muhammad Nur Putra Agustina; Artono Dwijo Sutomo; Hendri Widiyandari. Design a battery management system (BMS) with an automatic cut off system on LFP (LiFePO4) battery type for powerbank application. Journal of Physics: Conference Series 2021, 1825, 012038 .

AMA Style

Muhammad Nur Putra Agustina, Artono Dwijo Sutomo, Hendri Widiyandari. Design a battery management system (BMS) with an automatic cut off system on LFP (LiFePO4) battery type for powerbank application. Journal of Physics: Conference Series. 2021; 1825 (1):012038.

Chicago/Turabian Style

Muhammad Nur Putra Agustina; Artono Dwijo Sutomo; Hendri Widiyandari. 2021. "Design a battery management system (BMS) with an automatic cut off system on LFP (LiFePO4) battery type for powerbank application." Journal of Physics: Conference Series 1825, no. 1: 012038.

Conference paper
Published: 01 February 2021 in Journal of Physics: Conference Series
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Geothermal sludge (GS) is a by-product of geothermal exploration. The geothermal power plant in Dieng, Central Java Indonesia, produces 165 ton/month GS with high silica content. This study reported the synthesis of silica xerogel from GS by ultrasonic-assisted alkali extraction-acid precipitation. The silica was extracted as sodium silicate solution using NaOH solution, which was then reacted with HCl to produce silica xerogel. The ultrasonication treatment was carried out after the aging process. The structure of silica xerogel was amorphous silica. The ultrasonication affected the increasing specific surface area. N2 adsorption-desorption BET characterization shows that the specific surface area was 162.334 m2/g before ultrasonication and increased to 302,873 m2/g after 30 minutes of ultrasonication in controlled temperature at 26°C. The initial specific surface area of GS was 100.449 m2/g. The produced silica xerogel is a mesoporous material and have a pore size in the range of 2-12 nm.

ACS Style

Hendri Widiyandari; Shabrina Hayu Adhani; Agus Subagio; Agus Purwanto. Synthesis of Silica Xerogel from Geothermal Sludge by Ultrasonic Assisted Alkali Extraction-Acid Precipitation. Journal of Physics: Conference Series 2021, 1825, 012071 .

AMA Style

Hendri Widiyandari, Shabrina Hayu Adhani, Agus Subagio, Agus Purwanto. Synthesis of Silica Xerogel from Geothermal Sludge by Ultrasonic Assisted Alkali Extraction-Acid Precipitation. Journal of Physics: Conference Series. 2021; 1825 (1):012071.

Chicago/Turabian Style

Hendri Widiyandari; Shabrina Hayu Adhani; Agus Subagio; Agus Purwanto. 2021. "Synthesis of Silica Xerogel from Geothermal Sludge by Ultrasonic Assisted Alkali Extraction-Acid Precipitation." Journal of Physics: Conference Series 1825, no. 1: 012071.

Conference paper
Published: 29 December 2020 in Materials Today: Proceedings
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This work reported synthesis of PVDF/SiO2 (Polyvinilidene fluoride/Silica) nanofiber membrane by electrospinning method that was used as a separator in li-ion battery. The effect of the SiO2 nanoparticle addition to the PVDF nanofiber membrane to improve membrane characteristics which include porosity, temperature stability, mechanical strength and the stability of battery capacity were systematically investigated. The electrospinning parameter was adjusted at a voltage of 15 kV, the flow rate of 1,5 ml/hour, the distance between needle to collector 17 cm and spinning time for 1 h. The immersion of PVDF membrane in colloid SiO2 nanoparticles was carried out for 1 h. Nanofiber membrane was characterized by SEM (Scanning Electron Microscope), n-butanol intrusion, the dimensional changes before and after heat treatment, stress–strain mechanical measurements with autograph and battery analyzer. The PVDF nanofiber membrane has a beaded fiber with an average fiber size was ∼656 nm. The nanoparticle SiO2 formed double layer on the PVDF membrane. The porosity of PVDF without SiO2 and PVDF/SiO2 3000 ppm is 57% and 70%, respectively. The effect of addition SiO2 to mechanical strength were increased until 2.7 MPa and the membrane were stable at 150 °C for 30 min. The electrochemical performance test by using the produced PVDF membrane has a higher specific capacity than using PP membrane that is 104.6 mAh/g. The addition of SiO2 nanoparticles increased the PVDF membrane capacity stability for 6 cycles by the decline of specific capacity of 42.7 mAh/g for PVDF membrane to 18.7 mAh/g with the addition of 3000 ppm SiO2 nanoparticles.

ACS Style

Hendri Widiyandari; Oki Ade Putra; Agus Purwanto; Zaenal Abidin. Synthesis of PVDF/SiO2 nanofiber membrane using electrospinning method as a Li-ion battery separator. Materials Today: Proceedings 2020, 44, 3245 -3248.

AMA Style

Hendri Widiyandari, Oki Ade Putra, Agus Purwanto, Zaenal Abidin. Synthesis of PVDF/SiO2 nanofiber membrane using electrospinning method as a Li-ion battery separator. Materials Today: Proceedings. 2020; 44 ():3245-3248.

Chicago/Turabian Style

Hendri Widiyandari; Oki Ade Putra; Agus Purwanto; Zaenal Abidin. 2020. "Synthesis of PVDF/SiO2 nanofiber membrane using electrospinning method as a Li-ion battery separator." Materials Today: Proceedings 44, no. : 3245-3248.

Journal article
Published: 26 November 2020 in Applied Sciences
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Abundantly available SiO2 (silica) has great potential as an anode material for lithium-ion batteries because it is inexpensive and flexible. However, silicon oxide-based anode material preparation usually requires many complex steps. In this article, we report a facile method for preparing a SiO2/C composite derived from coal combustion fly ash as an anode material for Li-ion batteries. SiO2 was obtained by caustic extraction and HCl precipitation. Then, the SiO2/C composite was successfully obtained by mechanical milling followed by heat treatment. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Electrochemical properties were tested using an 18650 cylindrical cell utilizing LiNi0.8Co0.15Al0.05O2 (NCA) as the counter electrode. Based on the obtained results, the physiochemical characteristics and electrochemical performance, it was determined that SiO2/C composites were greatly affected by the temperature of heat treatment. The best result was obtained with the SiO2 content of 10% w/w, heating temperature of 500 °C, initial specific discharge capacity of 586 mAh g−1 at 0.1 C (1 C = 378 mAh g−1), and reversible capacity of 87% after 20 cycles. These results confirmed that the obtained materials had good initial discharge capacity, cyclability, high performance, and exhibited great potential as an anode material for LIBs.

ACS Style

Arif Jumari; Cornelius Satria Yudha; Hendri Widiyandari; Annisa Puji Lestari; Rina Amelia Rosada; Sigit Puji Santosa; Agus Purwanto. SiO2/C Composite as a High Capacity Anode Material of LiNi0.8Co0.15Al0.05O2 Battery Derived from Coal Combustion Fly Ash. Applied Sciences 2020, 10, 8428 .

AMA Style

Arif Jumari, Cornelius Satria Yudha, Hendri Widiyandari, Annisa Puji Lestari, Rina Amelia Rosada, Sigit Puji Santosa, Agus Purwanto. SiO2/C Composite as a High Capacity Anode Material of LiNi0.8Co0.15Al0.05O2 Battery Derived from Coal Combustion Fly Ash. Applied Sciences. 2020; 10 (23):8428.

Chicago/Turabian Style

Arif Jumari; Cornelius Satria Yudha; Hendri Widiyandari; Annisa Puji Lestari; Rina Amelia Rosada; Sigit Puji Santosa; Agus Purwanto. 2020. "SiO2/C Composite as a High Capacity Anode Material of LiNi0.8Co0.15Al0.05O2 Battery Derived from Coal Combustion Fly Ash." Applied Sciences 10, no. 23: 8428.

Journal article
Published: 13 October 2020 in Applied Sciences
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Highly crystalline “zero-strain” Li4Ti5O12 (LTO) has great potential as an alternative material for the anodes in a lithium ion battery. In this research, highly crystalline LTO with impressive electrochemical characteristics was synthesized via a salt-assisted solid-state reaction using TiO2, LiOH, and various amounts of NaCl as a salt additive. The LTO particles exhibited a cubic spinel structure with homogenous micron-sized particles. The highest initial specific discharge capacity of LTO was 141.04 mAh/g with 4 wt % NaCl addition, which was tested in a full-cell (LTO/LiFePO4) battery. The battery cell showed self-recovery ability during the cycling test at 10 C-rate, which can extend the cycle life of the cell. The salt-assisted process affected the crystallinity of the LTO particles, which has a favorable effect on its electrochemical performance as anodes.

ACS Style

Agus Purwanto; Soraya Ulfa Muzayanha; Cornelius Satria Yudha; Hendri Widiyandari; Arif Jumari; Endah Retno Dyartanti; Muhammad Nizam; Muhamad Iqbal Putra. High Performance of Salt-Modified–LTO Anode in LiFePO4 Battery. Applied Sciences 2020, 10, 7135 .

AMA Style

Agus Purwanto, Soraya Ulfa Muzayanha, Cornelius Satria Yudha, Hendri Widiyandari, Arif Jumari, Endah Retno Dyartanti, Muhammad Nizam, Muhamad Iqbal Putra. High Performance of Salt-Modified–LTO Anode in LiFePO4 Battery. Applied Sciences. 2020; 10 (20):7135.

Chicago/Turabian Style

Agus Purwanto; Soraya Ulfa Muzayanha; Cornelius Satria Yudha; Hendri Widiyandari; Arif Jumari; Endah Retno Dyartanti; Muhammad Nizam; Muhamad Iqbal Putra. 2020. "High Performance of Salt-Modified–LTO Anode in LiFePO4 Battery." Applied Sciences 10, no. 20: 7135.

Journal article
Published: 03 August 2020 in Optical Materials
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In this study we investigated the use of sub-micrometer ZnO hollow spheres as anti-reflection layers (ARLs) in dye-sensitized solar cells (DSSCs). The ZnO hollow sphere was synthesized by flame spray pyrolysis (FSP) followed by post-heating treatment. The ZnO hollow sphere was analyzed via x-ray diffraction (XRD), which revealed a hexagonal-wurtzite structure. A scanning electron microscope (SEM) image showed a uniform and spherical hollow particle with a narrow size distribution of the diameter: dav ~900 nm. In this research, the DSSCs were fabricated via manual screen printing with TiO2 nanoparticles (20 nm) as transparent layers and ZnO hollow spheres as anti-reflection layers. The performance of the DSSCs was investigated using a Keithley 2440 source meter under an AM 1.5 G solar simulator with a power intensity of 100 mW/cm2. The addition of the ZnO anti-reflecting layers resulted in a four-fold improvement in the efficiency of these DSSCs. In this study, we also noted that the photocurrent density was dependent on the size of the crystals in the ZnO ARLs. The photocurrent was further improved when crystal size was increased via heat treatment. As a result, the DSSCs using ZnO hollow spheres annealed at 900 °C and coated onto TiO2 film achieved a PCE of 2.61% (Voc of 0.75 V, Jsc of 10.03 mA cm−2, ad FF of 0.35), whereas DSSCs using TiO2 with a non-annealed ZnO ARL achieved a PCE of only 2.18% (Voc of 0.78 V, Jsc of 6.78 mA cm−2, and FF of 0.34), and the DSSCs with only TiO2 showed a paltry PCE of 0.64%.

ACS Style

Hendri Widiyandari; Suwastika Wijayanti; Adi Prasetio; Agus Purwanto. ZnO hollow sphere prepared by flame spray pyrolysis serves as an anti-reflection layer that improves the performance of dye-sensitized solar cells. Optical Materials 2020, 107, 110077 .

AMA Style

Hendri Widiyandari, Suwastika Wijayanti, Adi Prasetio, Agus Purwanto. ZnO hollow sphere prepared by flame spray pyrolysis serves as an anti-reflection layer that improves the performance of dye-sensitized solar cells. Optical Materials. 2020; 107 ():110077.

Chicago/Turabian Style

Hendri Widiyandari; Suwastika Wijayanti; Adi Prasetio; Agus Purwanto. 2020. "ZnO hollow sphere prepared by flame spray pyrolysis serves as an anti-reflection layer that improves the performance of dye-sensitized solar cells." Optical Materials 107, no. : 110077.

Conference paper
Published: 02 June 2020 in Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020)
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Geothermal sludge (GS) from Dieng geothermal power plant has high Silica (SiO2) content. Silica is a functional material in industrial application. This work reported preparation of anode active material from GS silica material for li-ion battery application. The anode active material was prepared by a series of processes as follows: acidification with 3% HCL, silica extraction with 3 M NaOH and 1 M HCL, silica purification with 37% HCL, metallothermal, and combustion. Chemical composition of the samples after metallothermal process (M1) contains the pure Si of 2.26% and increased after combustion process (M1P) to 10.60%. The electrochemical measurement was conducted using a cylindrical full cell battery 18650 with NCA as cathode. The specific discharge capacity for samples of M1P, M1 and graphite are 761.16, 605.56 and 314.45 mAhg−1, respectively. These results show that GS can be used as a raw material for anode active materials in li-ion battery applications.

ACS Style

H. Widiyandari; A. S. Wijareni; R. Ardiansyah; B. Purnama; A. Purwanto. Preparation of Anode Active Material by Utilizing of Silica from Geothermal Sludge for Li-Ion Battery Application. Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020) 2020, 787 -799.

AMA Style

H. Widiyandari, A. S. Wijareni, R. Ardiansyah, B. Purnama, A. Purwanto. Preparation of Anode Active Material by Utilizing of Silica from Geothermal Sludge for Li-Ion Battery Application. Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020). 2020; ():787-799.

Chicago/Turabian Style

H. Widiyandari; A. S. Wijareni; R. Ardiansyah; B. Purnama; A. Purwanto. 2020. "Preparation of Anode Active Material by Utilizing of Silica from Geothermal Sludge for Li-Ion Battery Application." Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020) , no. : 787-799.

Journal article
Published: 01 June 2020 in Energies
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The high throughput and rapid flame-assisted spray pyrolysis method has been adapted to synthesize cathode materials LiNi0.apCo0.15Al0.035O2 (NCA). This method is considered low cost and simple. By varying the precursor solution concentration and sintering temperature, the optimal condition was established at temperature sintering of 800 °C and precursor solution concentration of 1 M. X-ray diffraction patterns showed the as-prepared NCA particles exhibit a pure well-ordered hexagonal layer structure with high crystallinity. Polyhedral shaped micro-sized particles are confirmed by SEM images. Galvanostic charge–discharge tests were conducted using cylindrical full-cell utilizing artificial graphite as the anode. The highest specific initial discharge capacity measured between 2.7 and 4.3 V is 155 mAh g−1 with capacity retention of 92% after cycled at 0.2 C for 50 cycles. Thus, this method is considered as a satisfying approach for NCA mass production.

ACS Style

Cornelius Satria Yudha; Soraya Ulfa Muzayanha; Mintarsih Rahmawati; Hendri Widiyandari; Wahyudi Sutopo; Muhammad Nizam; Sigit Puji Santosa; Agus Purwanto. Fast Production of High Performance LiNi0.815Co0.15Al0.035O2 Cathode Material via Urea-Assisted Flame Spray Pyrolysis. Energies 2020, 13, 2757 .

AMA Style

Cornelius Satria Yudha, Soraya Ulfa Muzayanha, Mintarsih Rahmawati, Hendri Widiyandari, Wahyudi Sutopo, Muhammad Nizam, Sigit Puji Santosa, Agus Purwanto. Fast Production of High Performance LiNi0.815Co0.15Al0.035O2 Cathode Material via Urea-Assisted Flame Spray Pyrolysis. Energies. 2020; 13 (11):2757.

Chicago/Turabian Style

Cornelius Satria Yudha; Soraya Ulfa Muzayanha; Mintarsih Rahmawati; Hendri Widiyandari; Wahyudi Sutopo; Muhammad Nizam; Sigit Puji Santosa; Agus Purwanto. 2020. "Fast Production of High Performance LiNi0.815Co0.15Al0.035O2 Cathode Material via Urea-Assisted Flame Spray Pyrolysis." Energies 13, no. 11: 2757.

Journal article
Published: 27 May 2019 in Metals
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An approach for a fast recycling process for Lithium Nickel Cobalt Aluminum Oxide (NCA) cathode scrap material without the presence of a reducing agent was proposed. The combination of metal leaching using strong acids (HCl, H2SO4, HNO3) and mixed metal hydroxide co-precipitation followed by heat treatment was investigated to resynthesize NCA. The most efficient leaching with a high solid loading rate (100 g/L) was obtained using HCl, resulting in Ni, Co, and Al leaching efficiencies of 99.8%, 95.6%, and 99.5%, respectively. The recycled NCA (RNCA) was successfully synthesized and in good agreement with JCPDS Card #87-1562. The highly crystalline RNCA presents the highest specific discharge capacity of a full cell (RNCA vs. Graphite) of 124.2 mAh/g with capacity retention of 96% after 40 cycles. This result is comparable with commercial NCA. Overall, this approach is faster than that in the previous study, resulting in more efficient and facile treatment of the recycling process for NCA waste and providing 35 times faster processing.

ACS Style

Soraya Ulfa Muzayanha; Cornelius Satria Yudha; Adrian Nur; Hendri Widiyandari; Hery Haerudin; Hanida Nilasary; Ferry Fathoni; Agus Purwanto. A Fast Metals Recovery Method for the Synthesis of Lithium Nickel Cobalt Aluminum Oxide Material from Cathode Waste. Metals 2019, 9, 615 .

AMA Style

Soraya Ulfa Muzayanha, Cornelius Satria Yudha, Adrian Nur, Hendri Widiyandari, Hery Haerudin, Hanida Nilasary, Ferry Fathoni, Agus Purwanto. A Fast Metals Recovery Method for the Synthesis of Lithium Nickel Cobalt Aluminum Oxide Material from Cathode Waste. Metals. 2019; 9 (5):615.

Chicago/Turabian Style

Soraya Ulfa Muzayanha; Cornelius Satria Yudha; Adrian Nur; Hendri Widiyandari; Hery Haerudin; Hanida Nilasary; Ferry Fathoni; Agus Purwanto. 2019. "A Fast Metals Recovery Method for the Synthesis of Lithium Nickel Cobalt Aluminum Oxide Material from Cathode Waste." Metals 9, no. 5: 615.

Journal article
Published: 17 May 2019 in Energies
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Nickel-rich cathode material, NCA (85:14:1), is successfully synthesized using two different, simple and economical batch methods, i.e., hydroxide co-precipitation (NCA-CP) and the hydroxides solid state reaction method (NCA-SS), followed by heat treatments. Based on the FTIR spectra, all precursor samples exhibit two functional groups of hydroxide and carbonate. The XRD patterns of NCA-CP and NCA-SS show a hexagonal layered structure (space group: R_3m), with no impurities detected. Based on the SEM images, the micro-sized particles exhibit a sphere-like shape with aggregates. The electrochemical performances of the samples were tested in a 18650-type full-cell battery using artificial graphite as the counter anode at the voltage range of 2.7–4.25 V. All samples have similar characteristics and electrochemical performances that are comparable to the commercial NCA battery, despite going through different synthesis routes. In conclusion, the overall results are considered good and have the potential to be adapted for commercialization.

ACS Style

Cornelius Satria Yudha; Soraya Ulfa Muzayanha; Hendri Widiyandari; Ferry Iskandar; Wahyudi Sutopo; Agus Purwanto. Synthesis of LiNi0.85Co0.14Al0.01O2 Cathode Material and its Performance in an NCA/Graphite Full-Battery. Energies 2019, 12, 1886 .

AMA Style

Cornelius Satria Yudha, Soraya Ulfa Muzayanha, Hendri Widiyandari, Ferry Iskandar, Wahyudi Sutopo, Agus Purwanto. Synthesis of LiNi0.85Co0.14Al0.01O2 Cathode Material and its Performance in an NCA/Graphite Full-Battery. Energies. 2019; 12 (10):1886.

Chicago/Turabian Style

Cornelius Satria Yudha; Soraya Ulfa Muzayanha; Hendri Widiyandari; Ferry Iskandar; Wahyudi Sutopo; Agus Purwanto. 2019. "Synthesis of LiNi0.85Co0.14Al0.01O2 Cathode Material and its Performance in an NCA/Graphite Full-Battery." Energies 12, no. 10: 1886.

Conference paper
Published: 01 April 2019 in Journal of Physics: Conference Series
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Carbon quantum dots (CQDs or CDs) recently have attracted attention due to their unique optical and chemical properties. Herein we demonstrate a facile protocol to synthesize CDs via the microwave-assisted method. In this research, we use citric acid as carbon source and urea as nitrogen source. The UV-vis absorption of CDs show two peaks at 326 and 408 nm respectively correspond to the π→π transition of C=C bonds and n→π transition of C=O or other bonds on the CDs surface. The CDs solution emit green color emission at wavelength 521 nm λ excitation = 365 nm), which the highest PL intensity is achieved by the CDs heated in microwave for 15 min. Moreover, we also conducted a preliminary study of the CDs as sensitizers in dye-sensitized solar cells (DSSCs) based on TiO2 nanocrystalline. The power conversion efficiency (η), fill factor (FF) and short-circuit current density (Jsc) of 0.29%, 0.31 and 0.36 mA/cm2, respectively, are achieved for the CDs based cell. This research suggests that the CDs have the potential application as sensitizers in DSSCs.

ACS Style

I Alkian; A Prasetio; L Anggara; Karnaji; M H Fonisyah; Z M Rizka; H Widiyandari. A Facile Microwave-Assisted Synthesis of Carbon Dots and Their Application as Sensitizers in Nanocrystalline TiO2 Solar Cells. Journal of Physics: Conference Series 2019, 1204, 012093 .

AMA Style

I Alkian, A Prasetio, L Anggara, Karnaji, M H Fonisyah, Z M Rizka, H Widiyandari. A Facile Microwave-Assisted Synthesis of Carbon Dots and Their Application as Sensitizers in Nanocrystalline TiO2 Solar Cells. Journal of Physics: Conference Series. 2019; 1204 (1):012093.

Chicago/Turabian Style

I Alkian; A Prasetio; L Anggara; Karnaji; M H Fonisyah; Z M Rizka; H Widiyandari. 2019. "A Facile Microwave-Assisted Synthesis of Carbon Dots and Their Application as Sensitizers in Nanocrystalline TiO2 Solar Cells." Journal of Physics: Conference Series 1204, no. 1: 012093.

Conference paper
Published: 26 February 2019 in Journal of Physics: Conference Series
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The synthesis of LiNi0.8Mn0.1Co0.1O2 (LNMC) material had been performed via hydrothermal method. LNMC materials as Li-ion battery cathode is chosen because it has many advantages, such as the availability of abundant materials, low cost, high capacity and superior performance of the battery. In this research, hydrothermal method is chosen because it can increase the size of crystallite with good structure hence the crystal quality is improved which is advantageous to improve battery capacity and cycle performance. The novelty of this study is the use of nickel sulfate, manganese sulfate and cobalt sulfate as the transitional metal source of LNMC. The hydrothermal temperature was varied between 160°C - 190°C. Based on X-ray Diffraction test (XRD), LNMC material has crystallite size in the range 45.37 - 46.74 nm. While based on the chargedischarge test, the resulting LNMC cathode battery has a capacity value in the range 0.0453 - 1.199 mAh/g. The highest capacity was obtained on batteries using LNMC cathode electrodes synthesized at 190° C hydrothermal (LNMC H-190 samples). This could be caused by large crystallite size of the sample. As the size of the crystal increases, the Li+ ion intercalation pathways will be wider hence the storage capacity is also greater.

ACS Style

Hendri Widiyandari; Atika Nadya Sukmawati; Heri Sutanto; Cornelius Yudha; Agus Purwanto. Synthesis of LiNi0.8Mn0.1Co0.1O2 cathode material by hydrothermal method for high energy density lithium ion battery. Journal of Physics: Conference Series 2019, 1153, 012074 .

AMA Style

Hendri Widiyandari, Atika Nadya Sukmawati, Heri Sutanto, Cornelius Yudha, Agus Purwanto. Synthesis of LiNi0.8Mn0.1Co0.1O2 cathode material by hydrothermal method for high energy density lithium ion battery. Journal of Physics: Conference Series. 2019; 1153 (1):012074.

Chicago/Turabian Style

Hendri Widiyandari; Atika Nadya Sukmawati; Heri Sutanto; Cornelius Yudha; Agus Purwanto. 2019. "Synthesis of LiNi0.8Mn0.1Co0.1O2 cathode material by hydrothermal method for high energy density lithium ion battery." Journal of Physics: Conference Series 1153, no. 1: 012074.

Conference paper
Published: 26 February 2019 in Journal of Physics: Conference Series
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The performance of dye sensitized solar cell (DSSC) is mainly based on the dye as sensitizer. Natural dyes become one of the most commonly used because of its low cost and abundance in supply of raw materials. However, the efficiency of DSSC with natural dyes is low because of low conductivity. In this research, modification of natural dye has been studied by doping Magnesium (Mg) to anthocyanin from Hylocereus costaricensis peel extracted with methanol, aquades, and acetic acid. Mg metal was obtained from MgSO4.7H2O salt at various concentration. This research resulted that the conversion efficiency of DSSC was increase and the optimum efficiency was obtained at 0,0924% when using Mg doped dye with MgSO4.7H2O salt concentration of 0.01 M. Fourier Transform Infra Red Spectrophotometer analysis showed that anthocyanin dye with 0.01 M doping has lowest transmittance. This suggested that 0,01 M doping has greatest dipole moment change, so it become the most polar molecule and has good conducting electrical current.

ACS Style

Pitri Andayani; Fahru Nurosyid; Hendri Widiyandari. Mg doped anthocyanin from Hylocereus costaricensis peel for improved conversion efficiency of DSSC. Journal of Physics: Conference Series 2019, 1153, 012080 .

AMA Style

Pitri Andayani, Fahru Nurosyid, Hendri Widiyandari. Mg doped anthocyanin from Hylocereus costaricensis peel for improved conversion efficiency of DSSC. Journal of Physics: Conference Series. 2019; 1153 (1):012080.

Chicago/Turabian Style

Pitri Andayani; Fahru Nurosyid; Hendri Widiyandari. 2019. "Mg doped anthocyanin from Hylocereus costaricensis peel for improved conversion efficiency of DSSC." Journal of Physics: Conference Series 1153, no. 1: 012080.

Conference paper
Published: 01 October 2018 in 2018 5th International Conference on Electric Vehicular Technology (ICEVT)
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Ni-rich cathode material in Li-ion Battery had become popular and widely used as energy storage in mobile devices and electrical vehicles. LiNi 0.8 Co 0.15 Al 0.05 O 2 is a cathode material that has high energy density compared to other. While the co-precipitation route has become a technology of choice in the production of LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) due to its ability to form a particle with high homogeneity in atomic level, the utilization of ammonia as chelating agents in co-precipitation of NCA precursor has become a concern due to its volatile, harmful and non-environmental friendly properties. An alternative green chelating agent such as glucose and glycerol has been applied in this study. The obtained hydroxide precursor was sintered under the air stream. The effects of glucose and glycerol during precursor precipitation are investigated. X-Ray diffraction patterns indicate that the material has a layered-hexagonal structure with high degree ordering. The thermal decomposition of a precursor is studied from TG/DTA. The morphology of the material is characterized by SEM (scanning electron microscope) analysis. The electrochemical performance were performed by chargedischarge test between 2.8-4.3 V at 1/20 C. Improving performance and characteristic is exhibited by the material with green chelating agents.

ACS Style

Ike Puji Lestari; Cornelius Satria Yudha; Anisa Raditya Nurohmah; Hendri Widiyandari; Muhammad Nur Ikhsanudin; Agus Purwanto. Synthesis and Characterization of LiNi0.8Co0.15Al0.05O2 Cathode Material Via Co-Precipitation Method With Green Chelating Agents. 2018 5th International Conference on Electric Vehicular Technology (ICEVT) 2018, 53 -56.

AMA Style

Ike Puji Lestari, Cornelius Satria Yudha, Anisa Raditya Nurohmah, Hendri Widiyandari, Muhammad Nur Ikhsanudin, Agus Purwanto. Synthesis and Characterization of LiNi0.8Co0.15Al0.05O2 Cathode Material Via Co-Precipitation Method With Green Chelating Agents. 2018 5th International Conference on Electric Vehicular Technology (ICEVT). 2018; ():53-56.

Chicago/Turabian Style

Ike Puji Lestari; Cornelius Satria Yudha; Anisa Raditya Nurohmah; Hendri Widiyandari; Muhammad Nur Ikhsanudin; Agus Purwanto. 2018. "Synthesis and Characterization of LiNi0.8Co0.15Al0.05O2 Cathode Material Via Co-Precipitation Method With Green Chelating Agents." 2018 5th International Conference on Electric Vehicular Technology (ICEVT) , no. : 53-56.

Conference paper
Published: 01 October 2018 in 2018 5th International Conference on Electric Vehicular Technology (ICEVT)
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The development of energy storage devices, i.e. Lithium ion batteries (LIBs) has become interesting due to the increasing utilization of renewable energies sources and electric vehicles. LiNiCoAlO 2 as LIBs cathode material is highly attractive for its high specific capacity and better thermal stability. The aim of this research is to investigate the effect of varying available synthesis methods in order to obtain better characterized NCA material. NCA powder was obtained from solid state synthesis[1], hydroxide co-precipitation synthesis, carbonate co-precipitation[2] and direct co-precipitation, denoted as NCA-SS, NCA-HC, NCA-CC and NCA-DC respectively, characterized using X-ray diffractometer. The structure study performed by comparing the results with commercial NCA XRD patterns and confirmed indexing the XRD patterns of the samples to JCPDS 871562. Based on the structural analysis, all sample exhibited well-ordered hexagonal layered structure. From the lattice parameter study, it is concluded that the best method was established by sample obtained from direct co-precipitation.

ACS Style

Karina Diah Rosa Ekawati; Asih Purwanti Sholikah; Cornelius Satria Yudha; Hendri Widiyandari; Agus Purwanto. Comparative Study of NCA Cathode Material Synthesis Methods towards Their Structure Characteristics. 2018 5th International Conference on Electric Vehicular Technology (ICEVT) 2018, 57 -61.

AMA Style

Karina Diah Rosa Ekawati, Asih Purwanti Sholikah, Cornelius Satria Yudha, Hendri Widiyandari, Agus Purwanto. Comparative Study of NCA Cathode Material Synthesis Methods towards Their Structure Characteristics. 2018 5th International Conference on Electric Vehicular Technology (ICEVT). 2018; ():57-61.

Chicago/Turabian Style

Karina Diah Rosa Ekawati; Asih Purwanti Sholikah; Cornelius Satria Yudha; Hendri Widiyandari; Agus Purwanto. 2018. "Comparative Study of NCA Cathode Material Synthesis Methods towards Their Structure Characteristics." 2018 5th International Conference on Electric Vehicular Technology (ICEVT) , no. : 57-61.

Journal article
Published: 26 September 2018 in Materials Research Express
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ACS Style

Agus Purwanto; Cornelius Satria Yudha; U Ubaidillah; Hendri Widiyandari; Takashi Ogi; Hery Haerudin. NCA cathode material: synthesis methods and performance enhancement efforts. Materials Research Express 2018, 5, 122001 .

AMA Style

Agus Purwanto, Cornelius Satria Yudha, U Ubaidillah, Hendri Widiyandari, Takashi Ogi, Hery Haerudin. NCA cathode material: synthesis methods and performance enhancement efforts. Materials Research Express. 2018; 5 (12):122001.

Chicago/Turabian Style

Agus Purwanto; Cornelius Satria Yudha; U Ubaidillah; Hendri Widiyandari; Takashi Ogi; Hery Haerudin. 2018. "NCA cathode material: synthesis methods and performance enhancement efforts." Materials Research Express 5, no. 12: 122001.

Conference paper
Published: 30 May 2018 in Journal of Physics: Conference Series
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In this paper, we analyzed J-V curve of the Dye-Sensitized Solar Cell (DSSC) using numerical calculations. The simulation is based on differential equation of photoelectrochemical in the DSSC. Using internal parameters of the DSSC (L, D, n0, t) appropriate for TiO2, we calculate the J-V curve numerically. The analysis is performed by also making variations in temperature, irradiant, absorption constant and photoelectrode thickness. We found that irradiant affect the J-V curve significantly compared to the three other variables. The change in absorption constant needs to be in a factor at least in order of 100 or more to obtain a change, which is considerably high in J-V curve. It is also found that the thickness of photoelectrode should be carefully considered since very thin thickness cannot support DSSC process.

ACS Style

Alvin Muhammad Habieb; Muhammad Irwanto; Ilham Alkian; Fitri Khalimatus Sya’Diyah; Hendri Widiyandari; Vincensius Gunawan. Dye-sensitized solar cell simulation performance using MATLAB. Journal of Physics: Conference Series 2018, 1025, 012001 .

AMA Style

Alvin Muhammad Habieb, Muhammad Irwanto, Ilham Alkian, Fitri Khalimatus Sya’Diyah, Hendri Widiyandari, Vincensius Gunawan. Dye-sensitized solar cell simulation performance using MATLAB. Journal of Physics: Conference Series. 2018; 1025 (1):012001.

Chicago/Turabian Style

Alvin Muhammad Habieb; Muhammad Irwanto; Ilham Alkian; Fitri Khalimatus Sya’Diyah; Hendri Widiyandari; Vincensius Gunawan. 2018. "Dye-sensitized solar cell simulation performance using MATLAB." Journal of Physics: Conference Series 1025, no. 1: 012001.

Conference paper
Published: 30 May 2018 in Journal of Physics: Conference Series
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Advance oxidation process (AOP) using photocatalysis constitute a promising technology for the treatment of wastewaters containing non-easily removable organic compound. Zinc oxide (ZnO) is one of efficient photocatalyst materials. This research reported synthesis of ZnO fine particle from zinc nitrate hexahydrate using Flame Spray Pyrolysis (FSP) method. In this method, oxygen (O2) gas were used as oxidizer and LPG (liquid petroleum gas) were used as fuel. The effect of O2 gas flow rate during ZnO particle fabrication to the microstructure, optical and photocatalytic properties were systematically discussed. The photocatalytic activity of ZnO was tested for the degradation of amaranth dye with initial concentration of 10 ppm under irradiation of solar simulator. The rate of decrease in amaranth concentration was measured using UV-Visible spectrophotometer. The ZnO synthesized using FSP has a hexagonal crystalline structure. Scanning electron microscope images showed that ZnO has a spherical formed which was the mixture of solid and hollow particles. The optimum condition for amaranth degradation was shown by ZnO produced at a flow rate of 1.5 L/min which able to degrade amaranth dye up to 95,3 % at 75 minutes irradiation.

ACS Style

Hendri Widiyandari; Ngurah Ayu Ketut Umiati; Rizki Dwi Herdianti. Synthesis and photocatalytic property of Zinc Oxide (ZnO) fine particle using flame spray pyrolysis method. Journal of Physics: Conference Series 2018, 1025, 012004 .

AMA Style

Hendri Widiyandari, Ngurah Ayu Ketut Umiati, Rizki Dwi Herdianti. Synthesis and photocatalytic property of Zinc Oxide (ZnO) fine particle using flame spray pyrolysis method. Journal of Physics: Conference Series. 2018; 1025 (1):012004.

Chicago/Turabian Style

Hendri Widiyandari; Ngurah Ayu Ketut Umiati; Rizki Dwi Herdianti. 2018. "Synthesis and photocatalytic property of Zinc Oxide (ZnO) fine particle using flame spray pyrolysis method." Journal of Physics: Conference Series 1025, no. 1: 012004.

Conference paper
Published: 30 May 2018 in Journal of Physics: Conference Series
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A making of MWCNTs-COOH has been conducted to improve the compatibility of carbon nanotubes and MWCNTs-NH2, in order to have conductive properties. The MWCNTs- COOH study was performed, using the first reflux method using HNO3 for 6 hours heated with 60°C (concentrated HNO3 ratio with MWCNTs is 1: 5), followed by the second reflux using SOCl2 for 5 hours heated to 70°C (concentrated HNO3 ratio with MWCNTs is 1: 3). Meanwhile, the making of MWCNTs-NH2 used homogenization process, used magnetic stirrer, with comparison between MWCNTs-COOH with Etanadiamine 1: 2000, for 8 hours at 40oC. Both products were analyzed using Fourier transform infrared (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). The C-O bond on MWCNTs-COOH is indicated by absorption at wavelength 1672.28 cm-1 and O-H bond at 3431.36 cm-1 N-H bond on MWCNTs-NH2 shown at wavelength 1440.83. The SEM analysis indicates that both products have a tubular surface morphology.

ACS Style

S. A. Wulandari; Arifin; Hendri Widiyandari; Agus Subagio. Synthesis and characterization carboxyl functionalized Multi-Walled Carbon Nanotubes (MWCNT-COOH) and NH2 functionalized Multi-Walled Carbon Nanotubes (MWCNTNH2). Journal of Physics: Conference Series 2018, 1025, 012005 .

AMA Style

S. A. Wulandari, Arifin, Hendri Widiyandari, Agus Subagio. Synthesis and characterization carboxyl functionalized Multi-Walled Carbon Nanotubes (MWCNT-COOH) and NH2 functionalized Multi-Walled Carbon Nanotubes (MWCNTNH2). Journal of Physics: Conference Series. 2018; 1025 (1):012005.

Chicago/Turabian Style

S. A. Wulandari; Arifin; Hendri Widiyandari; Agus Subagio. 2018. "Synthesis and characterization carboxyl functionalized Multi-Walled Carbon Nanotubes (MWCNT-COOH) and NH2 functionalized Multi-Walled Carbon Nanotubes (MWCNTNH2)." Journal of Physics: Conference Series 1025, no. 1: 012005.