Bimetallic Pt or Pd-based carbon supported nanoparticles are more stable than their monometallic counterparts for application in membraneless alkaline fuel cell anodes

Doan, Huong ¹Morais, Thiago ¹Borchtchoukova, Nino ²Wijsboom, Yair ²Sharabi, Ronit ²Chatenet, Marian ¹Finkelshtain, Gennadi²

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作者信息

1. Univ Grenoble Alpes, Univ Savoie Mt Blanc, Inst Engn & Management, CNRS,Grenoble INP,LEPMI, F-38000 Grenoble, France
2. GenCell Energy, Petah Tiqwa, Israel
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Abstract

Alkaline fuel cells (AFCs) are relevant for niche applications, but still require enhanced performance and lifetime. Active and durable hydrogen oxidation reaction (HOR) catalysts must be developed: linking their electrochemical surface area (ECSA) loss to their HOR activity and understanding whether the ECSA loss of carbonsupported platinum group metal-based (PGM/C) HOR catalysts is irreversible (nanoparticles dissolution, detachment, Ostwald ripening) or reversible is pivotal. Using identical-location transmission electron micrographs (IL-TEM) and ECSA characterizations by "CO-like" stripping undertaken pre and post accelerated stress tests (AST), the different degradation mechanisms undergone by monometallic (Pt/C and Pd/C) and bimetallic catalysts (Pd-Pt/C and Pd-Ni/C) are unveiled. Monometallic PGM/C undergo extensive reversible poisoning and irreversible degradation upon operation at low potential, in contrast to bimetallic catalysts, which are less affected. Pd-Ni exhibits the smallest loss of ECSAPGM and HOR activity: it poorly catalyzes carbon corrosion and is hardly poisoned by "CO-like" species.

Key words

Alkaline fuel cell/Hydrogen oxidation reaction/Platinum group metal catalysts/Durability/Poisoning

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量12

参考文献量41

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