论文类型：Research Article
第一作者：Liu,Xuan
通讯作者：Li,Qing
合写作者：Huang,Yunhui,Xiaoming,Wu,Han,Jiantao,Wang,Tanyuan,Priest,Cameron,Lu,Gang,Li,Shenzhou,Liang,Jiashun,Zhao,Zhonglong
发表刊物：Angewandte Chemie International Edition
所属单位：华中科技大学
刊物所在地：德国
文献类型：Article
卷号：62
期号：23
页面范围：e202302134
ISSN号：1521-3773
关键字：Covalent Interaction; Electrocatalysis; Fuel Cells; Intermetallics; Oxygen Reduction Reaction
DOI码：10.1002/anie.202302134
发表时间：2023-04-04
影响因子：16.1
摘要：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.