Impedance analysis of the effect of flooding in the cathode catalyst layer of the polymer electrolyte fuel cell

Hiroki Nara, Toshiyuki Momma, Tetsuya Osaka*

*この研究の対応する著者

研究成果: Article査読

26 被引用数 (Scopus)

抄録

A common understanding of polymer electrolyte fuel cells (PEFCs) is important to promote the development of PEFCs. This understanding is crucial because complicated phenomena such as chemical reactions, ion transport, and gas diffusion occur during the operation of PEFCs. Electrochemical impedance spectroscopy (EIS), which can separate reactions into elementary processes, is a powerful tool for the analysis of PEFCs without requiring disassembly of the cell. In this study, the effect of flooding in the cathode catalyst layer of PEFCs was analyzed by EIS using the transmission line model (TLM) to determine the distribution of catalytic reactions in the primary and secondary pores. The analysis was conducted by varying experimental conditions such as the relative humidity of the gases supplied into the anode and cathode, the flow rate, and the partial pressure of oxygen in the gas mixture supplied to the cathode channel. The EIS analysis suggests that the resistance to the catalytic reaction in the primary pores drastically increased with the current density. The results suggest that the flooding preferentially occurred in the primary pores, resulting in the reduction of active sites by generated water. The EIS method is a powerful tool for developing membrane electrode assemblies (MEAs) with effective porosity and tortuosity for gas diffusion and ionic transportation, and furthermore, it is a useful tool for judging the process of MEA preparation.

本文言語English
ページ(範囲)720-729
ページ数10
ジャーナルElectrochimica Acta
113
DOI
出版ステータスPublished - 2013 12月 15

ASJC Scopus subject areas

  • 化学工学(全般)
  • 電気化学

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