Promoting Ordering Degree of Intermetallic Fuel Cell Catalysts by Low-melting-point Metal Doping

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Sep 22

PMID 37736762

Authors

Ru-Yang Shao

Xiao-Chu Xu

Zhen-Hua Zhou

Wei-Jie Zeng

Tian-Wei Song

Peng Yin

Ang Li

Chang-Song Ma

Lei Tong

Yuan Kong

Hai-Wei Liang

Affiliations

Soon will be listed here.

Abstract

Carbon supported intermetallic compound nanoparticles with high activity and stability are promising cathodic catalysts for oxygen reduction reaction in proton-exchange-membrane fuel cells. However, the synthesis of intermetallic catalysts suffers from large diffusion barrier for atom ordering, resulting in low ordering degree and limited performance. We demonstrate a low-melting-point metal doping strategy for the synthesis of highly ordered L1-type M-doped PtCo (M = Ga, Pb, Sb, Cu) intermetallic catalysts. We find that the ordering degree of the M-doped PtCo catalysts increases with the decrease of melting point of M. Theoretic studies reveal that the low-melting-point metal doping can decrease the energy barrier for atom diffusion. The prepared highly ordered Ga-doped PtCo catalyst exhibits a large mass activity of 1.07 A mg at 0.9 V in H-O fuel cells and a rated power density of 1.05 W cm in H-air fuel cells, with a Pt loading of 0.075 mg cm.

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