Effects of the decomposition products of sulfonated polyimide and Nafion membranes on the degradation and recovery of electrode performance in PEFCs

Akihiro Kabasawa, Jumpei Saito, Kenji Miyatake, Hiroyuki Uchida, Masahiro Watanabe

研究成果: Article査読

27 被引用数 (Scopus)

抄録

Degradation and recovery of electrode performance during the operation of polymer electrolyte fuel cells (PEFCs) with sulfonated polyimide (SPI-8) and Nafion® membranes were evaluated by changes in cell voltage (Ecell), mass activity (MA), Tafel slope (TS), and electrochemical surface area (ECA) of the Pt catalyst. During continuous cell operation, values of Ecell, MA and ECA decreased, but TS increased. It was found by ion chromatography combined with mass spectrometry (IC/MS) that the drain water contained, as decomposition products, bisulfate and several other ionic compounds derived from the side chain of SPI-8. These ionic compounds were found to adsorb on the surface of the Pt cathode catalyst and to suppress oxygen adsorption, resulting in increases in the overpotential for the oxygen reduction reaction (ORR). The cathode performance was able to recover by potential cycling under high humidity conditions, as the ionic compounds were removed from the Pt surface.

本文言語English
ページ(範囲)2754-2760
ページ数7
ジャーナルElectrochimica Acta
54
10
DOI
出版ステータスPublished - 2009 4 1
外部発表はい

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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