One-Dimensional Modeling for Aging of Pt-Co Core-Shell Catalysts in Proton Exchange Membrane Fuel Cells

Catalyst durability is one of the critical challenges for the commercialization of proton exchange membrane fuel cell (PEMFC). In this study, a one-dimensional (1D) model of fuel cell cathode catalytic layer (CCL) is proposed to investigate the structural evolution, electrochemical surface area (ECS...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Electrochemical Society 2022-05, Vol.169 (5), p.54526
Main Authors: Yang, Yunjie, Bai, Minli, Lv, Jizu, Gao, Linsong, Li, Yang, Lv, Xuecheng, Li, Yubai, Song, Yongchen
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Catalyst durability is one of the critical challenges for the commercialization of proton exchange membrane fuel cell (PEMFC). In this study, a one-dimensional (1D) model of fuel cell cathode catalytic layer (CCL) is proposed to investigate the structural evolution, electrochemical surface area (ECSA), Pt and Co loss of Pt-Co shell-core structured catalysts, and then the aging mechanism of catalyst is elaborated by simulation. The model considers three main processes: (1) oxidation and redeposition of Pt on the Pt shell; (2) crossover H 2 through the membrane to reduce Pt 2+ near the CCL/membrane interface; and (3) leaching and dissolution of Co. The results show that the severe dissolution of catalyst particles near the CCL/membrane interface not only leads to a large loss of Pt and Co, but also causes the catalyst to age unevenly along the CCL thickness direction. In addition, both the increase in temperature and the decrease in the average particle size accelerate the catalyst aging.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ac6e4f