Epitaxial growth of Pt–Pd bimetallic heterostructures for the oxygen reduction reaction

Lian Ying Zhang; Tiantian Zeng; Linwei Zheng; Yanrui Wang; Weiyong Yuan; Mang Niu; Chun Xian Guo; Dapeng Cao; Chang Ming Li

Advanced Powder Materials (Oct 2023)

Epitaxial growth of Pt–Pd bimetallic heterostructures for the oxygen reduction reaction

Lian Ying Zhang,
Tiantian Zeng,
Linwei Zheng,
Yanrui Wang,
Weiyong Yuan,
Mang Niu,
Chun Xian Guo,
Dapeng Cao,
Chang Ming Li

Affiliations

Lian Ying Zhang: Institute of Materials for Energy and Environment, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China; Institute for Clean Energy and Advanced Materials, Southwest University, Chongqing 400715, China; School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637459, Singapore; Corresponding author. Institute of Materials for Energy and Environment, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
Tiantian Zeng: Institute of Materials for Energy and Environment, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
Linwei Zheng: Institute of Materials for Energy and Environment, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
Yanrui Wang: Institute of Materials for Energy and Environment, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
Weiyong Yuan: Institute for Clean Energy and Advanced Materials, Southwest University, Chongqing 400715, China
Mang Niu: Institute of Materials for Energy and Environment, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China; Corresponding author.
Chun Xian Guo: Institute for Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215011, China
Dapeng Cao: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
Chang Ming Li: Institute for Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215011, China; Corresponding author.

Journal volume & issue: Vol. 2, no. 4
p. 100131

Abstract

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It is of great importance to design highly active and stable electrocatalysts with low Pt loading to improve the sluggish kinetics of oxygen reduction reaction (ORR) for fuel cells. Herein, we report an epitaxial growth of a Pt–Pd bimetallic heterostructure with a Pt loading as low as 8.02 wt%. Both experimental studies and theoretical calculations confirm that the heterointerfaces play a major role in charge redistribution, which accelerates electron transfer from Pd to Pt, contributing to downshifting the d-band center of Pd and consequently greatly weakening the O adsorption energy for a critical optimal adsorption configuration of O∗ on the heterointerface. In particular, the adsorbed O∗, an intermediate in a bridge mode between adjacent Pt and Pd atoms, has a relative low adsorption energy, which easily forms H2O to escape for releasing the active sites toward ORR. The Pt–Pd heterostructured catalyst presents the highest mass activity of 6.06 A·mg−1Pt among all reported Pt–Pd alloyed or composited catalysts, which is 26.4 times of the sample Pt/C (0.23 A·mg−1Pt). Further, the fuel cell assembled by the electrocatalyst shows a current density of 1.23 A·cm−2 at 0.6 V and good stability for over 100 h.

Published in Advanced Powder Materials

ISSN: 2772-834X (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/advanced-powder-materials/

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