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As the environmental considerations rise all over the world and under the drive of renewable energy policy, the society of hydrogen energy will come out gradually in the future. The proton exchange membrane water electrolyzer (PEMWE) is a very good hydrogen generator, characterized by low cost, high efficiency and zero emission of greenhouse gases. In this study, the micro temperature, humidity, flow, pressure, voltage, and current sensors were successfully integrated on a 50 μm thick Polyimide (PI) substrate by using micro-electro-mechanical systems (MEMS) technology. After the optimal design and process optimization of the flexible 6-in-1 microsensor, it was embedded in the PEMWE for a 500-h persistent effect test and internal real-time microscopic monitoring.
Chi-Yuan Lee; Chia-Hung Chen; Guo-Bin Jung; Yu-Xiang Zheng; Yi-Cheng Liu. Persistent Effect Test and Internal Microscopic Monitoring for PEM Water Electrolyzer. Micromachines 2021, 12, 494 .
AMA StyleChi-Yuan Lee, Chia-Hung Chen, Guo-Bin Jung, Yu-Xiang Zheng, Yi-Cheng Liu. Persistent Effect Test and Internal Microscopic Monitoring for PEM Water Electrolyzer. Micromachines. 2021; 12 (5):494.
Chicago/Turabian StyleChi-Yuan Lee; Chia-Hung Chen; Guo-Bin Jung; Yu-Xiang Zheng; Yi-Cheng Liu. 2021. "Persistent Effect Test and Internal Microscopic Monitoring for PEM Water Electrolyzer." Micromachines 12, no. 5: 494.
In recent years, various countries have been paying attention to environmental protection issues, believing that climate change is the main challenge to the developed countries’ energy policies. The most discussed solution is renewable energy. The energy storage system can reduce the burden of the overall power system of renewable energy. The hydrogen energy is one of the optimal energy storage system options of renewable energy at present. According to these policies and the future trend, this study used micro-electro-mechanical systems (MEMS) technology to integrate micro voltage, current, temperature, humidity, flow and pressure sensors on a 50 μm thick polyimide (PI) substrate. After the optimization design and process optimization, the flexible six-in-one microsensor was embedded in the proton exchange membrane water electrolyzer (PEMWE) for internal real-time microscopic monitoring.
Chi-Yuan Lee; Chia-Hung Chen; Guo-Bin Jung; Yu-Xiang Zheng; Yi-Cheng Liu. PEMWE with Internal Real-Time Microscopic Monitoring Function. Membranes 2021, 11, 92 .
AMA StyleChi-Yuan Lee, Chia-Hung Chen, Guo-Bin Jung, Yu-Xiang Zheng, Yi-Cheng Liu. PEMWE with Internal Real-Time Microscopic Monitoring Function. Membranes. 2021; 11 (2):92.
Chicago/Turabian StyleChi-Yuan Lee; Chia-Hung Chen; Guo-Bin Jung; Yu-Xiang Zheng; Yi-Cheng Liu. 2021. "PEMWE with Internal Real-Time Microscopic Monitoring Function." Membranes 11, no. 2: 92.
The hydrogen production reaction of the proton exchange membrane (PEM) water electrolysis cell stack is the reverse reaction of the fuel cell, but the water electrolysis operation requires high pressure, and the high pressure decomposes hydrogen molecules, thus aging or causing failure in the water electrolysis cell stack. In addition, there are five important physical parameters (current, voltage, flow, pressure and temperature) inside the water electrolysis cell stack, which can change the performance and shorten the life of the cell stack. However, the present techniques obtain data only by external simulation or single measurement; they cannot collect the internal real data in operation instantly and accurately. This study discusses the causes for aging or failure, and develops an internal real-time microscopic diagnosis tool for accelerated aging of the PEM water electrolysis cell stack. A flexible integrated (current, voltage, flow, pressure and temperature) microsensor applicable to the inside (high voltage and electrochemical environment) of the PEM water electrolysis cell stack is developed by using micro-electro-mechanical systems (MEMS) technology; it is embedded in the PEM water electrolysis cell stack for microscopic diagnosis of accelerated aging, and 100-h durability and reliability tests are performed. The distribution of important physical parameters inside the PEM water electrolysis cell stack can be measured instantly and accurately, so as to adjust it to the optimal operating conditions, and the local aging and failure problems are discussed.
Chi-Yuan Lee; Chia-Hung Chen; Guo-Bin Jung; Shih-Chun Li; Yi-Zhen Zeng. Internal Microscopic Diagnosis of Accelerated Aging of Proton Exchange Membrane Water Electrolysis Cell Stack. Micromachines 2020, 11, 1078 .
AMA StyleChi-Yuan Lee, Chia-Hung Chen, Guo-Bin Jung, Shih-Chun Li, Yi-Zhen Zeng. Internal Microscopic Diagnosis of Accelerated Aging of Proton Exchange Membrane Water Electrolysis Cell Stack. Micromachines. 2020; 11 (12):1078.
Chicago/Turabian StyleChi-Yuan Lee; Chia-Hung Chen; Guo-Bin Jung; Shih-Chun Li; Yi-Zhen Zeng. 2020. "Internal Microscopic Diagnosis of Accelerated Aging of Proton Exchange Membrane Water Electrolysis Cell Stack." Micromachines 11, no. 12: 1078.
In order to increase the hydrogen production rate as well as ozone production at the anode side, increased voltage application and more catalyst utilization are necessary. The membrane electrode assembly (MEA) produces hydrogen/ozone via proton exchange membrane water electrolysis (PEMWE)s which gives priority to a coating method (abbreviation: ML). However, coating takes more effort and is labor-consuming. This study will present an innovative preparation method, known as flat layer (FL), and compare it with ML. FL can significantly reduce efforts and largely improve MEA production. Additionally, MEA with the FL method is potentially durable compared to ML.
Guo-Bin Jung; Shih-Hung Chan; Chun-Ju Lai; Chia-Chen Yeh; Jyun-Wei Yu. Innovative Membrane Electrode Assembly (MEA) Fabrication for Proton Exchange Membrane Water Electrolysis. Energies 2019, 12, 4218 .
AMA StyleGuo-Bin Jung, Shih-Hung Chan, Chun-Ju Lai, Chia-Chen Yeh, Jyun-Wei Yu. Innovative Membrane Electrode Assembly (MEA) Fabrication for Proton Exchange Membrane Water Electrolysis. Energies. 2019; 12 (21):4218.
Chicago/Turabian StyleGuo-Bin Jung; Shih-Hung Chan; Chun-Ju Lai; Chia-Chen Yeh; Jyun-Wei Yu. 2019. "Innovative Membrane Electrode Assembly (MEA) Fabrication for Proton Exchange Membrane Water Electrolysis." Energies 12, no. 21: 4218.
In proton exchange membrane water electrolysis system, the performance is highly affected by the anode materials and the operation modes. In addition, high voltages are for higher hydrogen production and also ozone for disinfection. After switching off of the power and restarted, a decrease in electric conductivity may lead to a performance drop in further hydrogen/ozone/generation. In this study, three different additives, A, Z and V are adopted which respectively mixed with the PbO2 and to become anode catalyst ink. The characteristics of the anode catalysts are determined by interruptive power supply, electrochemical impedance spectroscopy, and cyclic voltammetry tests. The results show that additives A and Z have batter current efficiency than the other groups. Additionally, anode catalyst withadditive V possess the most outstanding durability among all groups.
Jyun-Wei Yu; Guo-Bin Jung; Yi-Ju Su; Chia-Chen Yeh; Min-Yu Kan; Che-Yu Lee; Chun-Ju Lai. Proton exchange membrane water electrolysis system-membrane electrode assembly with additive. International Journal of Hydrogen Energy 2018, 44, 15721 -15726.
AMA StyleJyun-Wei Yu, Guo-Bin Jung, Yi-Ju Su, Chia-Chen Yeh, Min-Yu Kan, Che-Yu Lee, Chun-Ju Lai. Proton exchange membrane water electrolysis system-membrane electrode assembly with additive. International Journal of Hydrogen Energy. 2018; 44 (30):15721-15726.
Chicago/Turabian StyleJyun-Wei Yu; Guo-Bin Jung; Yi-Ju Su; Chia-Chen Yeh; Min-Yu Kan; Che-Yu Lee; Chun-Ju Lai. 2018. "Proton exchange membrane water electrolysis system-membrane electrode assembly with additive." International Journal of Hydrogen Energy 44, no. 30: 15721-15726.
Anode-supported cells are prepared by a sequence of hot pressing and co-sintering processes for solid oxide fuel cell (SOFC) applications. Commercially available porous anode tape (NiO/YSZ = 50 wt %/50 wt %), anode tape (NiO/YSZ = 30 wt %/70 wt %), and YSZ are used as the anode substrate, anode functional layer, and electrolyte layer, respectively. After hot pressing, the stacked layers are then sintered at different temperatures (1250 °C, 1350 °C, 1400 °C and 1450 °C) for 5 h in air. Different compressive loads are applied during the sintering process. An (La,Sr)MnO3 (LSM) paste is coated on the post-sintered anode-supported electrolyte surface as the cathode, and sintered at different temperatures (1100 °C, 1150 °C, 1200 °C and 1250 °C) for 2 h in air to generate anode-supported cells with dimensions of 60 × 60 mm2 (active reaction area of 50 × 50 mm2). SEM is used to investigate the anode structure of the anode-supported cells. In addition, confocal laser scanning microscopy is used to investigate the roughness of the cathode surfaces. At sintering temperatures of 1400 °C and 1450 °C, there is significant grain growth in the anode. Furthermore, the surface of the cathode is smoother at a firing temperature of 1200 °C. It is also found that the optimal compressive load of 1742 Pa led to a flatness of 168 µm/6 cm and a deformation of 0.72%. The open circuit voltage and power density of the anode-supported cell at 750 °C were 1.0 V and 178 mW·cm−2, respectively.
Xuan-Vien Nguyen; Chang-Tsair Chang; Guo-Bin Jung; Shih-Hung Chan; Wilson Chao-Wei Huang; Kai-Jung Hsiao; Win-Tai Lee; Shu-Wei Chang; I-Cheng Kao. Effect of Sintering Temperature and Applied Load on Anode-Supported Electrodes for SOFC Application. Energies 2016, 9, 701 .
AMA StyleXuan-Vien Nguyen, Chang-Tsair Chang, Guo-Bin Jung, Shih-Hung Chan, Wilson Chao-Wei Huang, Kai-Jung Hsiao, Win-Tai Lee, Shu-Wei Chang, I-Cheng Kao. Effect of Sintering Temperature and Applied Load on Anode-Supported Electrodes for SOFC Application. Energies. 2016; 9 (9):701.
Chicago/Turabian StyleXuan-Vien Nguyen; Chang-Tsair Chang; Guo-Bin Jung; Shih-Hung Chan; Wilson Chao-Wei Huang; Kai-Jung Hsiao; Win-Tai Lee; Shu-Wei Chang; I-Cheng Kao. 2016. "Effect of Sintering Temperature and Applied Load on Anode-Supported Electrodes for SOFC Application." Energies 9, no. 9: 701.
Commercially available tapes (anode, electrolyte) and paste (cathode) were choosen to prepare anode-supported cells for solid oxide fuel cell applications. For both anode-supported cells or electrolyte-supported cells, the anode needs pretreatment to reduce NiO/YSZ to Ni/YSZ to increase its conductivity as well as its catalytic characteristics. In this study, the effects of different pretreatments (open-circuit, closed-circuit) on cathode and anodes as well as SOFC performance are investigated. To investigate the influence of closed-circuit pretreatment on the NiO/YSZ anode alone, a Pt cathode is utilized as reference for comparison with the LSM cathode. The characterization of the electrical resistance, AC impedance, and SOFC performance of the resulting electrodes and/or anode-supported cell were carried out. It’s found that the influence of open-circuit pretreatment on the LSM cathode is limited. However, the influence of closed-circuit pretreatment on both the LSM cathode and NiO/YSZ anode and the resulting SOFC performance is profound. The effect of closed-circuit pretreatment on the NiO/YSZ anode is attributed to its change of electronic/pore structure as well as catalytic characteristics. With closed-circuit pretreatment, the SOFC performance improved greatly from the change of LSM cathode (and Pt reference) compared to the Ni/YSZ anode.
Guo-Bin Jung; Li-Hsing Fang; Min-Jay Chiou; Xuan-Vien Nguyen; Ay Su; Win-Tai Lee; Shu-Wei Chang; I-Cheng Kao; Jyun-Wei Yu. Effects of Pretreatment Methods on Electrodes and SOFC Performance. Energies 2014, 7, 3922 -3933.
AMA StyleGuo-Bin Jung, Li-Hsing Fang, Min-Jay Chiou, Xuan-Vien Nguyen, Ay Su, Win-Tai Lee, Shu-Wei Chang, I-Cheng Kao, Jyun-Wei Yu. Effects of Pretreatment Methods on Electrodes and SOFC Performance. Energies. 2014; 7 (6):3922-3933.
Chicago/Turabian StyleGuo-Bin Jung; Li-Hsing Fang; Min-Jay Chiou; Xuan-Vien Nguyen; Ay Su; Win-Tai Lee; Shu-Wei Chang; I-Cheng Kao; Jyun-Wei Yu. 2014. "Effects of Pretreatment Methods on Electrodes and SOFC Performance." Energies 7, no. 6: 3922-3933.
Nafion membranes are widely used for commercial membrane electrode assemblies (MEAs) in proton exchange fuel cells (PEMFCs). The polytetrafluoroethylene (PTFE)/Nafion (PN) composite membrane has the advantages of being low in cost, high in mechanical strength, and does not swell excessively. This study focuses on the properties of PTFE/Nafion membranes and PTFE/Nafion MEAs by comparing the durability and performance of the PN MEAs to commercial Nafion 211 MEAs. In an accelerated degradation test (ADT), the characterization of PTFE/Nafion and Nafion MEAs were analyzed using in-situ electrochemical methods such as polarization curves, AC impedance, cyclic voltammetry (CV), and linear sweep voltammetry (LSV). The results demonstrate an increase in the internal resistance on the PTFE/Nafion MEA only. The three mechanisms behind this unique result were proposed to be: (a) Separation of the catalyst layer from the membrane due to creep deformation; (b) Separation of the outer Nafion layer film from the core PTFE/Nafion membrane due to creep deformation; (c) Degradation of the Nafion plane (or Nafion dissolution) from the PTFE surface. The scanning electron microscope (SEM) images indicate that only the PTFE/Nafion MEA curved after the ADT. Mechanism (a) was therefore the most possible phenomenon for the increase in internal resistance of the PN MEA.
Ting-Chu Jao; Guo-Bin Jung; Shun-Chi Kuo; Wei-Jen Tzeng; Ay Su. Degradation mechanism study of PTFE/Nafion membrane in MEA utilizing an accelerated degradation technique. International Journal of Hydrogen Energy 2012, 37, 13623 -13630.
AMA StyleTing-Chu Jao, Guo-Bin Jung, Shun-Chi Kuo, Wei-Jen Tzeng, Ay Su. Degradation mechanism study of PTFE/Nafion membrane in MEA utilizing an accelerated degradation technique. International Journal of Hydrogen Energy. 2012; 37 (18):13623-13630.
Chicago/Turabian StyleTing-Chu Jao; Guo-Bin Jung; Shun-Chi Kuo; Wei-Jen Tzeng; Ay Su. 2012. "Degradation mechanism study of PTFE/Nafion membrane in MEA utilizing an accelerated degradation technique." International Journal of Hydrogen Energy 37, no. 18: 13623-13630.
PTFE/Nafion (PN) and PTFE/Nafion/TEOS (PNS) membranes were fabricated for the application of moderate and high temperature proton exchange membrane fuel cells (PEMFCs), respectively. Membrane electrode assemblies (MEAs) were fabricated by PTFE/Nafion (and PTFE/Nafion/TEOS) membranes with commercially available low and high temperature gas diffusion electrodes (GDEs). The effects of relative humidity, operation temperature, and back pressure on the performance and durability test of the as-prepared MEAs were investigated. Incorporating TEOS into a PNS membrane and adding another layer of carbon onto a GDE would result in low membrane conductivity and low fuel cell performance respectively. However, in this work it is shown that HT-PNS MEAs demonstrate a higher performance than LT-PN MEAs in severe conditions – high temperature (118 °C) and low humidity (25% RH). The TEOS and additional carbon layer function as water retaining agents which are especially important for high temperature and low humidity conditions. The HT-PNS MEA showed good stability in a 50 h fuel cell test at high temperature, moderate relative humidity (50% RH) and back pressure of 14.7 psi.
Guo-Bin Jung; Feng-Bor Weng; Chao-Chun Peng; Ting-Chu Jao. The development of PTFE/Nafion/TEOS membranes for application in moderate and high temperature proton exchange membrane fuel cells. International Journal of Hydrogen Energy 2011, 36, 6045 -6050.
AMA StyleGuo-Bin Jung, Feng-Bor Weng, Chao-Chun Peng, Ting-Chu Jao. The development of PTFE/Nafion/TEOS membranes for application in moderate and high temperature proton exchange membrane fuel cells. International Journal of Hydrogen Energy. 2011; 36 (10):6045-6050.
Chicago/Turabian StyleGuo-Bin Jung; Feng-Bor Weng; Chao-Chun Peng; Ting-Chu Jao. 2011. "The development of PTFE/Nafion/TEOS membranes for application in moderate and high temperature proton exchange membrane fuel cells." International Journal of Hydrogen Energy 36, no. 10: 6045-6050.
Single-step fabrication of a Poly(2,5-benzimidazole) (ABPBI)-based gas diffusion electrode (GDE) by directly adding a carbon-supported-catalyst to a homogeneous ABPBI solution prior to deposition and its membrane electrode assembly (MEA) were investigated for high-temperature proton exchange membrane (PEM) fuel cell applications. The ABPBI and LiCl dosages of the catalyst layer were varied. The characterizations of the resulting electrodes and/or MEA for the gas permeability, electrical resistance, specific electrochemical surface area, AC impedance, cyclic voltammetry and high-temperature PEM fuel cell performance were carried out. The high-temperature PEM fuel cell was successfully demonstrated at temperatures of up to 180 °C under ambient pressure operation. The fuel cell performance was evaluated by using dry hydrogen/oxygen gases, which added the advantage of eliminating the complicated humidification system of Nafion cells. The obtained results revealed that a catalyst layer with an ABPBI content of 15 wt.% and an ABPBI/LiCl ratio of 1:2 was sufficient to obtain the optimal cell performance with better electrochemical properties of low cell impedance, high electrochemical activity, low contact resistance and short activation time.
Ai-Lien Ong; Guo-Bin Jung; Chia-Ching Wu; Wei-Mon Yan. Single-step fabrication of ABPBI-based GDE and study of its MEA characteristics for high-temperature PEM fuel cells. International Journal of Hydrogen Energy 2010, 35, 7866 -7873.
AMA StyleAi-Lien Ong, Guo-Bin Jung, Chia-Ching Wu, Wei-Mon Yan. Single-step fabrication of ABPBI-based GDE and study of its MEA characteristics for high-temperature PEM fuel cells. International Journal of Hydrogen Energy. 2010; 35 (15):7866-7873.
Chicago/Turabian StyleAi-Lien Ong; Guo-Bin Jung; Chia-Ching Wu; Wei-Mon Yan. 2010. "Single-step fabrication of ABPBI-based GDE and study of its MEA characteristics for high-temperature PEM fuel cells." International Journal of Hydrogen Energy 35, no. 15: 7866-7873.
Increasing interest in utilizing proton exchange membrane fuel cells for sub-kilowatt mobile applications has prompted the need for fundamental understanding of operating characteristics of polymer electrolyte membrane (PEM) fuel cells. However, there is a few published data regarding related information, especially for PEM fuel cells with ambient force-feed air-supply and their stack design which is the subject of this study. Although the air for the cathode was directed from ambient atmosphere with variable humidity, the flow rates were controlled in order to simulate their effects on the cell performance under real conditions. In addition, the steady-state performance and transient response for H2/air PEM fuel cells were investigated under a variety of load cycles and operating conditions. Impact of H2 humidity on the performance was negative for this simplified stack design under appropriate operation current output and the dry H2 was utilized for the rest of this study. It was found that the humidity of cathode inlet gas had a significant effect on fuel cell performance. When the air relative humidity was higher than 55%, the stack operation resulted in more stable and higher performance. In addition, high moving rate of fuel cell stack (i.e. 20.3 km h−1) was found necessary for supplying air to the fuel cell directly and indirectly in order to prevent stack from over-heating.
Guo-Bin Jung; Kai-Fan Lo; Ay Su; Feng-Bor Weng; Cheng-Hsin Tu; Teng-Fu Yang; Shih-Hung Chan. Experimental evaluation of an ambient forced-feed air-supply PEM fuel cell. International Journal of Hydrogen Energy 2008, 33, 2980 -2985.
AMA StyleGuo-Bin Jung, Kai-Fan Lo, Ay Su, Feng-Bor Weng, Cheng-Hsin Tu, Teng-Fu Yang, Shih-Hung Chan. Experimental evaluation of an ambient forced-feed air-supply PEM fuel cell. International Journal of Hydrogen Energy. 2008; 33 (12):2980-2985.
Chicago/Turabian StyleGuo-Bin Jung; Kai-Fan Lo; Ay Su; Feng-Bor Weng; Cheng-Hsin Tu; Teng-Fu Yang; Shih-Hung Chan. 2008. "Experimental evaluation of an ambient forced-feed air-supply PEM fuel cell." International Journal of Hydrogen Energy 33, no. 12: 2980-2985.
A comparative study is carried out on the effect of cosintering temperature of anode–electrolyte bilayer on the fabrication and cell performance of anode-supported solid oxide fuel cells from commercially available tape casting materials. It was found that the sintering conditions have profound effects on the anode characteristic and cell performance. For low cosintering temperature as low as 1,250 °C, the electrolyte is unable to sinter fully and forms a porous structure which leads to a reduced open-circuit potential and poor cell performance especially under low current output. For further increasing cosintering temperature to 1,350 °C, the cell performance was lower under low current operation. However, the cell performance turns out to be better than that of high-temperature cosintering under high current output. Although at temperature as high as 1,500 °C the cell performs better than that of low temperature cosintering, the trend turn out to be reverse for high current operating due to less anode surface area resulting from overagglomeration of anode layer. An optimal cosintering temperature of 1,350–1,450 °C is recommended for commercially available anode–electrolyte bilayer of anode-supported solid oxide fuel cells.
Guo-Bin Jung; Ching-Jun Wei; Ay Su; Fang-Bor Weng; Yen-Chen Hsu; Shih-Hung Chan. Effect of cosintering of anode–electrolyte bilayer on the fabrication of anode-supported solid oxide fuel cells. Journal of Solid State Electrochemistry 2008, 12, 1605 -1610.
AMA StyleGuo-Bin Jung, Ching-Jun Wei, Ay Su, Fang-Bor Weng, Yen-Chen Hsu, Shih-Hung Chan. Effect of cosintering of anode–electrolyte bilayer on the fabrication of anode-supported solid oxide fuel cells. Journal of Solid State Electrochemistry. 2008; 12 (12):1605-1610.
Chicago/Turabian StyleGuo-Bin Jung; Ching-Jun Wei; Ay Su; Fang-Bor Weng; Yen-Chen Hsu; Shih-Hung Chan. 2008. "Effect of cosintering of anode–electrolyte bilayer on the fabrication of anode-supported solid oxide fuel cells." Journal of Solid State Electrochemistry 12, no. 12: 1605-1610.
Flow-field design of direct methanol fuel cell (DMFCs) plays an important role affecting the cell performance. Previous studies suggest that the combination of anode parallel flow field and cathode serpentine flow-field present the best and stable performance. Among these, cathode flow-field holds higher influence than that of anode. However, more detailed experiments needed to be done to find out the reasons. In this study, CFDRC half-cell models are adopted to simulate the flow phenomena within serpentine, parallel and grid flow field. We find that gas is well distributed within serpentine flow field while barren region are observed within parallel flow field. These factors contribute to the cell performance greatly. In addition, the durability test of DMFCs using parallel flow field is improved when the flow rate is increased or the current is uphold at inferior, so the barren region maintained at an acceptable level.
Guo-Bin Jung; Ay Su; Cheng-Hsin Tu; Yur-Tsai Lin; Fang-Bor Weng; Shih-Hung Chan. Effects of cathode flow fields on direct methanol fuel cell-simulation study. Journal of Power Sources 2007, 171, 212 -217.
AMA StyleGuo-Bin Jung, Ay Su, Cheng-Hsin Tu, Yur-Tsai Lin, Fang-Bor Weng, Shih-Hung Chan. Effects of cathode flow fields on direct methanol fuel cell-simulation study. Journal of Power Sources. 2007; 171 (1):212-217.
Chicago/Turabian StyleGuo-Bin Jung; Ay Su; Cheng-Hsin Tu; Yur-Tsai Lin; Fang-Bor Weng; Shih-Hung Chan. 2007. "Effects of cathode flow fields on direct methanol fuel cell-simulation study." Journal of Power Sources 171, no. 1: 212-217.
An important objective in the development of solid oxide fuel cell (SOFC) is to produce thin stabilized zirconia electrolytes that are supported upon the nickel–zirconia composite anode. Although this will reduce some of the problems associated with SOFCs by permitting lower temperature operation, this design may encounter problems during start- up. The first step in a start-up involves the reduction of nickel oxide in the anode to metallic nickel and increase of three-phase boundary will be beneficial for further reaction. In this study, two pretreatment methods are investigated for their effects on the performances of SOFC. Performances of the SOFCs are influenced by the pretreatment conditions, which included exposure of the cells to dilute H2/O2 either under open-circuit or closed-circuit conditions before their performance studies. By carrying out the methods, the pretreatment using the closed circuit is found to attain much higher performances effectively and efficiently. Accompanying with SEM and element analysis, increase of three-phase boundary is considered to give rise to changes in the anode microstructure, leading to activation of the anode. Mechanisms of NiO in anode reducing to Ni and porous structure via different pretreatments and their effects on the anode microstructure are proposed.
Guo-Bin Jung; Kai-Fan Lo; Shih-Hung Chan. Effect of pretreatments on the anode structure of solid oxide fuel cells. Journal of Solid State Electrochemistry 2007, 11, 1435 -1440.
AMA StyleGuo-Bin Jung, Kai-Fan Lo, Shih-Hung Chan. Effect of pretreatments on the anode structure of solid oxide fuel cells. Journal of Solid State Electrochemistry. 2007; 11 (10):1435-1440.
Chicago/Turabian StyleGuo-Bin Jung; Kai-Fan Lo; Shih-Hung Chan. 2007. "Effect of pretreatments on the anode structure of solid oxide fuel cells." Journal of Solid State Electrochemistry 11, no. 10: 1435-1440.