Indexed by: Research Article

First Author: Liu,Xuan

Correspondence Author: Li,Qing

Co-author: Huang,Yunhui,Xiaoming,Wu,Han,Jiantao,Wang,Tanyuan,Priest,Cameron,Lu,Gang,Li,Shenzhou,Liang,Jiashun,Zhao,Zhonglong

Journal: Angewandte Chemie International Edition

Affiliation of Author(s): 华中科技大学

Place of Publication: 德国

Document Type: Article

Volume: 62

Issue: 23

Page Number: e202302134

ISSN No.: 1521-3773

Key Words: Covalent Interaction; Electrocatalysis; Fuel Cells; Intermetallics; Oxygen Reduction Reaction

DOI number: 10.1002/anie.202302134

Date of Publication: 2023-04-04

Impact Factor: 16.1

Abstract: The harsh working environments of proton exchange membrane fuel cells (PEMFCs) pose huge challenges to the stability of Pt-based alloy catalysts. The widespread presence of metallic bonds with significantly delocalized electron distribution often lead to component segregation and rapid performance decay. Here we report L10−Pt2CuGa intermetallic nanoparticles with a unique covalent atomic interaction between Pt−Ga as high-performance PEMFC cathode catalysts. The L10−Pt2CuGa/C catalyst shows superb oxygen reduction reaction (ORR) activity and stability in fuel cell cathode (mass activity=0.57 A mgPt−1 at 0.9 V, peak power density=2.60/1.24 W cm−2 in H2-O2/air, 28 mV voltage loss at 0.8 A cm−2 after 30 000 cycles). Theoretical calculations reveal the optimized adsorption of oxygen intermediates via the formed biaxial strain on L10−Pt2CuGa surface, and the durability enhancement stems from the stronger Pt−M bonds than those in L11−PtCu resulted from Pt−Ga covalent interactions.