Dynamic current cycles effect on the degradation characteristic of a H2/O2 proton exchange membrane fuel cell

Meng, Kai; Zhou, Heng; Chen, Ben; Tu, Zhengkai

doi:10.1016/j.energy.2021.120168

Cited by 38 publications

(13 citation statements)

References 37 publications

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“…EIS upon combination with Long Short-Term Memory (LSTM) neural networks helps in prediction of the degradation of fuel cells [45]. Apart from this, information regarding the additional sensitivity of fuel cells for differentiating catalyst layer degradation has also been provided by EIS [46]. EIS provides a better understanding of charge transfer resistance and mass transfer between electrodes in biofuel cells [47,48].…”

Section: Eis For Fuel Cell Applicationsmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy (EIS) Performance Analysis and Challenges in Fuel Cell Applications

Padha

Verma

Mahajan

et al. 2022

J. Electrochem. Sci. Technol

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Electrochemical impedance spectroscopy (EIS) is a unique non-destructive technique employed to analyze various devices in different energy storage applications. It characterizes materials and interfaces for their properties in heterogeneous systems employing equivalent circuits as models. So far, it has been used to analyze the performance of various photovoltaic cells, fuel cells, batteries, and other energy storage devices, through equivalent circuit designing. This review highlights the diverse applications of EIS in fuel cells and specific parameters affecting its performance. A particular emphasis has been laid on the challenges faced by this technique and their possible solutions.

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Section: Eis For Fuel Cell Applicationsmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy (EIS) Performance Analysis and Challenges in Fuel Cell Applications

Padha

Verma

Mahajan

et al. 2022

J. Electrochem. Sci. Technol

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“…A total of 10 studs were used, and the torque applied on each nut was 50 kgfÁcm and was accurately given by the torque wrench (TOHNICHI) to avoid the adverse effects on the fuel cell aroused by uneven stress distribution. 35 After a single fuel cell was assembled, related experiments on the 850e (Hephas Energy Corporation) test system were conducted. This equipment can accurately control the inlet temperature, relative humidity, working pressure, and flow rate and obtain real-time voltage and current density parameters.…”

Section: Governing Equationsmentioning

confidence: 99%

Performance improvement in a proton exchange membrane fuel cell with an innovative flow field design

Huang

Xing

2021

Intl J of Energy Research

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The flow field of the proton exchange membrane fuel cell (PEMFC) controls mass and water transfer; it significantly impacts the fuel cell's performance. It is critical to innovate the flow field design for optimizing the performance. This paper proposes a new-designed flow field (NDFF) patterned with the built-in blockage and trap-shape rib association. The novel design was analyzed numerically and experimentally. A three-dimensional isothermal numerical model was first established based on COMSOL software. This model demonstrated that the NDFF transformed the traditional diffusion mass transfer into the optimized diffusion and convection mass transfer combination.Compared with the conventional straight flow field, the effective mass transfer coefficient was considerably improved. Moreover, the new-designed structures enforced cyclical variation of local velocity and pressure, forming forced-convection, which was beneficial for water management. At 0.45AÁcm À2 , the steady-state voltage and the initial dynamic response voltage were increased by 0.08 V and 0.16 V; power density was increased by 20.1%. The experimental results were collected to validate the enhanced performance of PEMFC with the NDFF. Energy efficiency ratio (EER) was proposed as an evaluation criterion; EER results suggested NDFF can improve the net output power. Highlights• A new flow field patterned with built-in blockage and trap shape rib association• Energy efficiency ratio, effective mass transfer coefficient used for evaluation • Steady-state and dynamic performances are greatly improved at an increased Energy efficiency ratioenergy efficiency ratio, flow field, oxygen and water distribution, proton exchange membrane fuel cell | INTRODUCTIONClimate change caused by environmental pollution and global warming is getting great attention; PEMFCs demonstrated outstanding potential for their advantage of zero-pollution. 1-3 Significant progress has been achieved in developing PEMFC's technologies; however, the cost is still one main obstacle that restricts the large-scale commercialization. 4 The cost can be reduced by improving PEMFC's performance. 5 Flow field significantly affects a fuel cell's performance, whose difference among PEMFCs with

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“…Dead-ended anodes (DEAs) and cathodes are commonly used in hydrogen–oxygen fuel cells to increase the gas utilization rate. In H 2 /O 2 PEMFCs, water management is a difficulty. − The water generated in the cathode catalyst layer (CL) will diffuse back to the anode and accumulate, − causing local fuel starvation and catalyst carbon corrosion. − Yang et al optimized the flow channel structure and operation modes in the DEA configuration. According to Soopee et al, the internal water flooding of the flow channel in a fuel cell will become serious as the current density increases, which is consistent with the researches of Shao et al…”

Section: Introductionmentioning

confidence: 99%

Catalyst Degradation Mitigation and Fuel Utilization Enhancement of a Dead-Ended Anode and Cathode Proton Exchange Membrane Fuel Cell with Periodical Oxygen Supply

Liu

Chan

2022

ACS Sustainable Chem. Eng.

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Hydrogen−oxygen proton exchange membrane fuel cells (PEMFCs) have promising military applications. However, carbon corrosion in the catalyst layer induced by water flooding significantly affects the performance and longevity of PEMFCs. In this study, a periodical oxygen supply strategy is proposed to improve water management in PEMFCs. The hydrogen and oxygen utilization reached 99.84 and 98.82%, respectively. The performance degradation rate of a PEMFC with a current density of 600 mA•cm −2 decreased by 45.1% under the proposed strategy. According to morphological results, the thickness degradation rate of the cathode catalyst layer operating in the proposed strategy is generally lower than that in the conventional dead-ended mode, which was mainly due to the irreversible Pt agglomeration, oxidation, and carbon support corrosion, especially in the oxygen outlet area. This work contributes to the engineering application of H 2 /O 2 PEMFCs by providing a deeper understanding of dead-ended behaviors.

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Dynamic current cycles effect on the degradation characteristic of a H2/O2 proton exchange membrane fuel cell

Cited by 38 publications

References 37 publications

Electrochemical Impedance Spectroscopy (EIS) Performance Analysis and Challenges in Fuel Cell Applications

Electrochemical Impedance Spectroscopy (EIS) Performance Analysis and Challenges in Fuel Cell Applications

Performance improvement in a proton exchange membrane fuel cell with an innovative flow field design

Catalyst Degradation Mitigation and Fuel Utilization Enhancement of a Dead-Ended Anode and Cathode Proton Exchange Membrane Fuel Cell with Periodical Oxygen Supply

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