特集 「燃料電池研究の最前線」
新規アノード触媒の研究開発：電解質膜の劣化抑制機能，高い水素酸化活性，耐CO被毒性と耐酸化性の発現
2021 年 46 巻 2 号 p. 63-70
詳細
2021 年 46 巻 2 号 p. 63-70
Platinum skin-covered Pt-M alloy (M=Fe, Co, Ni) nanocatalysts supported on carbon exhibited superlative mass activity for the hydrogen oxidation reaction (HOR) with high CO-tolerance and robustness with respect to air exposure, as novel anode catalysts for the polymer electrolyte fuel cell (PEFC). H2O2 is produced when O2 gas diffuses through the polymer electrolyte membrane (PEM) to the conventional Pt/C hydrogen anode in PEFC. H2O2 is the precursor of ・OH radicals, which degrade PEM seriously. It was found for the first time that H2O2 production rate at Pt skin-PtCo/C anode during the HOR was suppressed greatly at a practical temperature of 80°C. A remarkably longer lifetime of a PEM with new PtCo/C anode than the case of commercial Pt/C anode has been demonstrated in an accelerated stress test of a single cell. These excellent properties of Pt skin-PtCo have been analyzed multilaterally.
