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Received MSc.-Physics (2009-2011), Tribhuvan University, Nepal. Received Ph.D.-Electrical Engineering (2016-2020), SDSU, SD-USA. He has co-/authored more than 40 peer-reviewed journal articles including the leading journals such as" Nature communications 11, no. 1 (2020): 1-10, and Advanced Energy Materials 9, no. 36 (2019): 1901486. Currently, his research focuses on the development and analysis of a solid electrolyte-electrode interface (SEI) between lithium, and electrolyte (liquid/solid).
Project Goal: Engineering the Li electrode/liquid electrolyte interface
Current Stage: analyzing
Transition-metal phosphides (TMPs)-based hybrid structure have received considerable attention for efficient sodium storage owing to their high capacity and decent reversibility. However, the volume expansion & the poor electronic conductivity of TMPs, the poor-rate capability, and fast capacity decay greatly hinder its practical application. To address these issues, a low-cost and facile strategy for the synthesis of Ni, N-codoped graphitized carbon (C) and cobalt phosphide (CoP) embedded in carbon fiber ([email protected]⊂CF) as self-supporting anode material is demonstrated for the first time. The graphitized carbon and carbon fiber improve the electrical conductivity and inhibit the volume expansion issues. In addition to that, the microporous structure, and ultrasmall sized Ni-CoP offer a high surface area for electrolyte wettability, short Na-ion diffusion path and fast charge transport kinetics. As a result, outstanding electrochemical performance with an average capacity decay of 0.04% cycle−1 at 2000 mA g−1, an excellent rate capability of 270 mAh g−[email protected] mA g−1 and a high energy density of ∼231.1 Wh kg−1 is achieved with binder-free self-supporting anode material. This work shows a potential for designing binder-free and high energy density sodium-ion batteries
Huijun Li; Xiaomin Wang; Zhenxin Zhao; Rajesh Pathak; Siyue Hao; XiaoMing Qiu; Qiquan Qiao. Microstructure Controlled Synthesis of Ni, N-codoped CoP/Carbon Fiber Hybrids with Improving Reaction Kinetics for Superior Sodium Storage. Journal of Materials Science & Technology 2021, 1 .
AMA StyleHuijun Li, Xiaomin Wang, Zhenxin Zhao, Rajesh Pathak, Siyue Hao, XiaoMing Qiu, Qiquan Qiao. Microstructure Controlled Synthesis of Ni, N-codoped CoP/Carbon Fiber Hybrids with Improving Reaction Kinetics for Superior Sodium Storage. Journal of Materials Science & Technology. 2021; ():1.
Chicago/Turabian StyleHuijun Li; Xiaomin Wang; Zhenxin Zhao; Rajesh Pathak; Siyue Hao; XiaoMing Qiu; Qiquan Qiao. 2021. "Microstructure Controlled Synthesis of Ni, N-codoped CoP/Carbon Fiber Hybrids with Improving Reaction Kinetics for Superior Sodium Storage." Journal of Materials Science & Technology , no. : 1.
Organic-inorganic hybrid perovskite solar cell (PSC) has received widespread attention due to its high efficiency, low cost, and easy fabrication process. However, the commercialization of PSC is still hindered due to their unstable properties. Current density-voltage (J-V) hysteresis is one of the instabilities that causes overestimate or underestimate of the real conversion efficiency of PSC, making it difficult to assess the true photovoltaic parameters. This review discusses the internal and external factors that causes the J-V hysteresis phenomenon and presents various strategies to alleviate the J-V hysteresis in PSC. This article also provides insights into the perspectives and critical challenges that are needed to address the hysteresis of PSC for further improvement of device performance.
Fan Wu; Rajesh Pathak; Qiquan Qiao. Origin and alleviation of J-V hysteresis in perovskite solar cells: A short review. Catalysis Today 2021, 374, 86 -101.
AMA StyleFan Wu, Rajesh Pathak, Qiquan Qiao. Origin and alleviation of J-V hysteresis in perovskite solar cells: A short review. Catalysis Today. 2021; 374 ():86-101.
Chicago/Turabian StyleFan Wu; Rajesh Pathak; Qiquan Qiao. 2021. "Origin and alleviation of J-V hysteresis in perovskite solar cells: A short review." Catalysis Today 374, no. : 86-101.
High cost and environmentally unfavourable considerations are the major obstacles that prohibit renewable energy storage from many applications. To solve these issues, novel renewable materials such as biomass-derived carbon that have low cost, ecofriendly, and deliver high-energy storage performance should be employed. In this work, renewable carbon YP-50, biochar synthesized from coconut, was activated using different plasma gases including methane (CH4), carbon dioxide (CO2), hydrogen (H2), and argon (Ar). Compared with the conventional activation method, plasma treatment takes less time and effort. A significant increase in the specific surface area (SSA) and improvement in the specific capacitance (SC) were found with different plasma treatments. Specifically, the CH4 plasma-treated YP-50 exhibited the highest SC of 181.6 F g−1 at 0.05 A g−1 compared with other gases. In addition, the highest energy density of 25.3 Wh kg−1 was obtained at the specific power of 0.12 kW kg−1 for CH4 treated biochar. This enhancement of charge storage capacity is highly associated with the distribution of a variety of pore sizes and a large surface area. Furthermore, the charge transfer resistance reduced from 21.7 Ω to 1.4 Ω after CH4 treatment, and high capacitance retention was achieved due to its excellent electrochemical stability and good performance. Hence, this high-energy plasma treatment with a short time opens p a new opportunity for the efficient activation of carbon materials of supercapacitors with high electrochemical performances.
Ezaldeen Adhamash; Rajesh Pathak; Ke Chen; Tawabur Rahman; Ahmed El-Magrous; Zhengrong Gu; Shun Lu; Qiquan Qiao; Yue Zhou. High-energy plasma activation of renewable carbon for enhanced capacitive performance of supercapacitor electrode. Electrochimica Acta 2020, 362, 137148 .
AMA StyleEzaldeen Adhamash, Rajesh Pathak, Ke Chen, Tawabur Rahman, Ahmed El-Magrous, Zhengrong Gu, Shun Lu, Qiquan Qiao, Yue Zhou. High-energy plasma activation of renewable carbon for enhanced capacitive performance of supercapacitor electrode. Electrochimica Acta. 2020; 362 ():137148.
Chicago/Turabian StyleEzaldeen Adhamash; Rajesh Pathak; Ke Chen; Tawabur Rahman; Ahmed El-Magrous; Zhengrong Gu; Shun Lu; Qiquan Qiao; Yue Zhou. 2020. "High-energy plasma activation of renewable carbon for enhanced capacitive performance of supercapacitor electrode." Electrochimica Acta 362, no. : 137148.
(a) Schematic of the biochar carbon YP-50 exposed to gamma radiation. (b) Cyclic Voltammetry of supercapacitor with untreated biochar and biochar treated with 50 kGy, 100 kGy, and 150 kGy gamma-radiation.
Ezaldeen Adhamash; Rajesh Pathak; Qiquan Qiao; Yue Zhou; Robert McTaggart. Gamma-radiated biochar carbon for improved supercapacitor performance. RSC Advances 2020, 10, 29910 -29917.
AMA StyleEzaldeen Adhamash, Rajesh Pathak, Qiquan Qiao, Yue Zhou, Robert McTaggart. Gamma-radiated biochar carbon for improved supercapacitor performance. RSC Advances. 2020; 10 (50):29910-29917.
Chicago/Turabian StyleEzaldeen Adhamash; Rajesh Pathak; Qiquan Qiao; Yue Zhou; Robert McTaggart. 2020. "Gamma-radiated biochar carbon for improved supercapacitor performance." RSC Advances 10, no. 50: 29910-29917.
Rechargeable lithium metal anode (LMA) based batteries have attracted great attention as next-generation high-energy-density storage systems to fuel the extensive practical applications in portable electronics and electric vehicles. However, the formation of unstable solid-electrolyte- interphase (SEI) and growth of lithium dendrite during plating/stripping cycles stimulate safety concern, poor coulombic efficiency (CE), and short lifespan of the lithium metal batteries (LMBs). To address these issues, the rational design of micro/nanostructured Li hosts are widely adopted in LMBs. The high surface area of the interconnected conductive framework can homogenize the Li-ion flux distribution, lower the effective current density, and provides sufficient space for Li accommodation. However, the poor lithiophilicity of the micro/nanostructure host cannot govern the initial lithium nucleation, which leads to the non-uniform/dendritic Li deposition and unstable SEI formation. As a result, the nucleation overpotential and voltage hysteresis increases, which eventually leads to poor battery cycling performance. Thus, it is imperative to decorate a micro/nanostructured Li host with lithiophilic coatings or seeds for serving as a homogeneous nucleation site to guide the uniform lithium deposition. In this review, we summarize research progress on porous metal and non-metal based lithiophilic micro/nanostructured Li hosts. We present the synthesis, structural properties, and the significance of lithiophilic decorated micro/nanostructured Li host in the LMBs. Finally, the perspectives and critical challenges needed to address for the further improvement of LMBs are concluded.
Rajesh Pathak; Yue Zhou; Qiquan Qiao. Recent Advances in Lithiophilic Porous Framework toward Dendrite-Free Lithium Metal Anode. Applied Sciences 2020, 10, 4185 .
AMA StyleRajesh Pathak, Yue Zhou, Qiquan Qiao. Recent Advances in Lithiophilic Porous Framework toward Dendrite-Free Lithium Metal Anode. Applied Sciences. 2020; 10 (12):4185.
Chicago/Turabian StyleRajesh Pathak; Yue Zhou; Qiquan Qiao. 2020. "Recent Advances in Lithiophilic Porous Framework toward Dendrite-Free Lithium Metal Anode." Applied Sciences 10, no. 12: 4185.
Lithium metal anodes have attracted extensive attention owing to their high theoretical specific capacity. However, the notorious reactivity of lithium prevents their practical applications, as evidenced by the undesired lithium dendrite growth and unstable solid electrolyte interphase formation. Here, we develop a facile, cost-effective and one-step approach to create an artificial lithium metal/electrolyte interphase by treating the lithium anode with a tin-containing electrolyte. As a result, an artificial solid electrolyte interphase composed of lithium fluoride, tin, and the tin-lithium alloy is formed, which not only ensures fast lithium-ion diffusion and suppresses lithium dendrite growth but also brings a synergistic effect of storing lithium via a reversible tin-lithium alloy formation and enabling lithium plating underneath it. With such an artificial solid electrolyte interphase, lithium symmetrical cells show outstanding plating/stripping cycles, and the full cell exhibits remarkably better cycling stability and capacity retention as well as capacity utilization at high rates compared to bare lithium.
Rajesh Pathak; Ke Chen; Ashim Gurung; Khan Mamun Reza; Behzad Bahrami; Jyotshna Pokharel; Abiral Baniya; Wei He; Fan Wu; Yue Zhou; Kang Xu; Qiquan (Quinn) Qiao. Fluorinated hybrid solid-electrolyte-interphase for dendrite-free lithium deposition. Nature Communications 2020, 11, 1 -10.
AMA StyleRajesh Pathak, Ke Chen, Ashim Gurung, Khan Mamun Reza, Behzad Bahrami, Jyotshna Pokharel, Abiral Baniya, Wei He, Fan Wu, Yue Zhou, Kang Xu, Qiquan (Quinn) Qiao. Fluorinated hybrid solid-electrolyte-interphase for dendrite-free lithium deposition. Nature Communications. 2020; 11 (1):1-10.
Chicago/Turabian StyleRajesh Pathak; Ke Chen; Ashim Gurung; Khan Mamun Reza; Behzad Bahrami; Jyotshna Pokharel; Abiral Baniya; Wei He; Fan Wu; Yue Zhou; Kang Xu; Qiquan (Quinn) Qiao. 2020. "Fluorinated hybrid solid-electrolyte-interphase for dendrite-free lithium deposition." Nature Communications 11, no. 1: 1-10.
A flexible copper-clad lithiophilic current collector was designed for high coulombic efficiency dendrite-free Li metal anodes.
Ke Chen; Rajesh Pathak; Ashim Gurung; Khan M. Reza; Nabin Ghimire; Jyotshna Pokharel; Abiral Baniya; Wei He; James J. Wu; Qiquan (Quinn) Qiao; Yue Zhou. A copper-clad lithiophilic current collector for dendrite-free lithium metal anodes. Journal of Materials Chemistry A 2019, 8, 1911 -1919.
AMA StyleKe Chen, Rajesh Pathak, Ashim Gurung, Khan M. Reza, Nabin Ghimire, Jyotshna Pokharel, Abiral Baniya, Wei He, James J. Wu, Qiquan (Quinn) Qiao, Yue Zhou. A copper-clad lithiophilic current collector for dendrite-free lithium metal anodes. Journal of Materials Chemistry A. 2019; 8 (4):1911-1919.
Chicago/Turabian StyleKe Chen; Rajesh Pathak; Ashim Gurung; Khan M. Reza; Nabin Ghimire; Jyotshna Pokharel; Abiral Baniya; Wei He; James J. Wu; Qiquan (Quinn) Qiao; Yue Zhou. 2019. "A copper-clad lithiophilic current collector for dendrite-free lithium metal anodes." Journal of Materials Chemistry A 8, no. 4: 1911-1919.
This review focuses on recent advances in interface engineering of solid-state batteries based on inorganic oxide and sulfide solid electrolytes.
Ashim Gurung; Jyotshna Pokharel; Abiral Baniya; Rajesh Pathak; Ke Chen; Buddhi Sagar Lamsal; Nabin Ghimire; Wen-Hua Zhang; Yue Zhou; Qiquan Qiao. A review on strategies addressing interface incompatibilities in inorganic all-solid-state lithium batteries. Sustainable Energy & Fuels 2019, 3, 3279 -3309.
AMA StyleAshim Gurung, Jyotshna Pokharel, Abiral Baniya, Rajesh Pathak, Ke Chen, Buddhi Sagar Lamsal, Nabin Ghimire, Wen-Hua Zhang, Yue Zhou, Qiquan Qiao. A review on strategies addressing interface incompatibilities in inorganic all-solid-state lithium batteries. Sustainable Energy & Fuels. 2019; 3 (12):3279-3309.
Chicago/Turabian StyleAshim Gurung; Jyotshna Pokharel; Abiral Baniya; Rajesh Pathak; Ke Chen; Buddhi Sagar Lamsal; Nabin Ghimire; Wen-Hua Zhang; Yue Zhou; Qiquan Qiao. 2019. "A review on strategies addressing interface incompatibilities in inorganic all-solid-state lithium batteries." Sustainable Energy & Fuels 3, no. 12: 3279-3309.
Rajesh Pathak; Ke Chen; Ashim Gurung; Khan Mamun Reza; Behzad Bahrami; Fan Wu; Ashraf Chaudhary; Nabin Ghimire; Bin Zhou; Wen‐Hua Zhang; Yue Zhou; Qiquan Qiao. Ultrathin Bilayer of Graphite/SiO 2 as Solid Interface for Reviving Li Metal Anode. Advanced Energy Materials 2019, 9, 1 .
AMA StyleRajesh Pathak, Ke Chen, Ashim Gurung, Khan Mamun Reza, Behzad Bahrami, Fan Wu, Ashraf Chaudhary, Nabin Ghimire, Bin Zhou, Wen‐Hua Zhang, Yue Zhou, Qiquan Qiao. Ultrathin Bilayer of Graphite/SiO 2 as Solid Interface for Reviving Li Metal Anode. Advanced Energy Materials. 2019; 9 (36):1.
Chicago/Turabian StyleRajesh Pathak; Ke Chen; Ashim Gurung; Khan Mamun Reza; Behzad Bahrami; Fan Wu; Ashraf Chaudhary; Nabin Ghimire; Bin Zhou; Wen‐Hua Zhang; Yue Zhou; Qiquan Qiao. 2019. "Ultrathin Bilayer of Graphite/SiO 2 as Solid Interface for Reviving Li Metal Anode." Advanced Energy Materials 9, no. 36: 1.
Unstable solid electrolyte interphase (SEI) layer formation and uncontrolled lithium (Li) dendrites growth are two major obstacles that hinder the application of Li metal as the anode in Li batteries. To solve these problems, a multifunctional protective layer was designed for the first time using N2 plasma activation of the Li metal. A highly [001] oriented and flower shaped Li3N layer was obtained on the surface of Li metal with a plasma activation time less than 5 minutes. Due to high Young's modulus (48 GPa) and high ionic conductivity (5.02×10-1 mS cm-1), this unique protective layer can physically block the direct contact between reactive Li metal and the liquid organic electrolyte, and suppress the Li dendrites formation. It gives rise to a stable voltage profile with plating/stripping for 30,000 minutes in a symmetric cell. For Li/LCO full cell, the plasma activated Li3N electrode shows better capacity retention of more than 96% and higher capacity at a 5 C rate compared to bare Li anode. This plasma activation strategy provides a facile, scalable and efficient approach to realize a safe Li metal battery with superior electrochemical performance.
Ke Chen; Rajesh Pathak; Ashim Gurung; Ezaldeen A. Adhamash; Behzad Bahrami; Qingquan He; Hui Qiao; Alevtina L. Smirnova; James J. Wu; Qiquan Qiao; Yue Zhou. Flower-shaped lithium nitride as a protective layer via facile plasma activation for stable lithium metal anodes. Energy Storage Materials 2019, 18, 389 -396.
AMA StyleKe Chen, Rajesh Pathak, Ashim Gurung, Ezaldeen A. Adhamash, Behzad Bahrami, Qingquan He, Hui Qiao, Alevtina L. Smirnova, James J. Wu, Qiquan Qiao, Yue Zhou. Flower-shaped lithium nitride as a protective layer via facile plasma activation for stable lithium metal anodes. Energy Storage Materials. 2019; 18 ():389-396.
Chicago/Turabian StyleKe Chen; Rajesh Pathak; Ashim Gurung; Ezaldeen A. Adhamash; Behzad Bahrami; Qingquan He; Hui Qiao; Alevtina L. Smirnova; James J. Wu; Qiquan Qiao; Yue Zhou. 2019. "Flower-shaped lithium nitride as a protective layer via facile plasma activation for stable lithium metal anodes." Energy Storage Materials 18, no. : 389-396.
It has been a challenge to use transitional metal oxides as anode materials in Li-ion batteries due to their low electronic conductivity, poor rate capability and large volume expansion.
Rajesh Pathak; Ashim Gurung; Hytham Elbohy; Ke Chen; Khan Mamun Reza; Behzad Bahrami; Sally Mabrouk; Raju Ghimire; Matthew Hummel; Zhengrong Gu; XiaoMing Wang; Yucheng Wu; Yue Zhou; Qiquan Qiao. Self-recovery in Li-metal hybrid lithium-ion batteries via WO3 reduction. Nanoscale 2018, 10, 15956 -15966.
AMA StyleRajesh Pathak, Ashim Gurung, Hytham Elbohy, Ke Chen, Khan Mamun Reza, Behzad Bahrami, Sally Mabrouk, Raju Ghimire, Matthew Hummel, Zhengrong Gu, XiaoMing Wang, Yucheng Wu, Yue Zhou, Qiquan Qiao. Self-recovery in Li-metal hybrid lithium-ion batteries via WO3 reduction. Nanoscale. 2018; 10 (34):15956-15966.
Chicago/Turabian StyleRajesh Pathak; Ashim Gurung; Hytham Elbohy; Ke Chen; Khan Mamun Reza; Behzad Bahrami; Sally Mabrouk; Raju Ghimire; Matthew Hummel; Zhengrong Gu; XiaoMing Wang; Yucheng Wu; Yue Zhou; Qiquan Qiao. 2018. "Self-recovery in Li-metal hybrid lithium-ion batteries via WO3 reduction." Nanoscale 10, no. 34: 15956-15966.
Solar cells become a viable energy source to charge lithium ion batteries. Here a simple and efficient photocharging design approach is demonstrated, where a promising low cost single junction solar cell such as perovskite solar cell or dye sensitized solar cell efficiently charges a Li4Ti5O12‐LiCoO2 Li‐ion cell using a DC–DC voltage boost converter. The converter boosts the low input voltage of a single junction solar cell to charge a lithium ion cell and offers advantages including maximum power point tracking of solar photovoltaics and overvoltage protection for the lithium ion cell. This is the first demonstration of this technology. This approach leads to the highest reported overall efficiency of 9.36% and average storage efficiency of 77.2% at 0.5 C discharge for a perovskite solar cell‐converter charging. The high efficiency for the perovskite solar cell‐converter charging is attributed to maximum power harvesting along with high power conversion efficiency of the perovskite solar cell and low potential polarization between the charge and discharge voltage plateaus for the Li4Ti5O12‐LiCoO2 Li‐ion cell.
Ashim Gurung; Ke Chen; Reza Khan; Salem Saad Abdulkarim; Geetha Varnekar; Rajesh Pathak; Roya Naderi; Qiquan Qiao. Highly Efficient Perovskite Solar Cell Photocharging of Lithium Ion Battery Using DC-DC Booster. Advanced Energy Materials 2017, 7, 1 .
AMA StyleAshim Gurung, Ke Chen, Reza Khan, Salem Saad Abdulkarim, Geetha Varnekar, Rajesh Pathak, Roya Naderi, Qiquan Qiao. Highly Efficient Perovskite Solar Cell Photocharging of Lithium Ion Battery Using DC-DC Booster. Advanced Energy Materials. 2017; 7 (11):1.
Chicago/Turabian StyleAshim Gurung; Ke Chen; Reza Khan; Salem Saad Abdulkarim; Geetha Varnekar; Rajesh Pathak; Roya Naderi; Qiquan Qiao. 2017. "Highly Efficient Perovskite Solar Cell Photocharging of Lithium Ion Battery Using DC-DC Booster." Advanced Energy Materials 7, no. 11: 1.