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interatomic diffusion in Pd-Pt core-shell nanoparticles

Chinese Journal of Catalysis 2020年第5期41卷 807-812页

作者： Yanfeng Zhang Shangqian Zhu Lili Zhang Dong Su Minhua Shao Jiangsu Aoxin NEV Co. LtdYanchengJiangsuChina Department of Chemical and Biological Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Shanghai AI NEV Innovative Platform Co. LtdShanghaiChina Jiangsu Key Laboratory for Chemistry of Low-Dimension Materials Huaiyin Normal UniversityHuaian 223300JiangsuChina Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNY 11973USA

Pt monolayer-based core-shell catalysts have garnered significant interest for the application of low temperature fuel cell technology as their use may enable a decreased loading of Pt while still providing sufficient current density to meet volumetric requirements. One promising candidate in this class of materials is a Pd@Pt core-shell catalyst, which shows enhanced activity toward oxygen reduction reaction(ORR). One concern with the use of Pd@Pt, however, is the durability of the core-shell structure as Pd atoms are thermodynamically favored to migrate to the surface. The pathway of the migration has not been systematically studied. The current study explores the stability of this structure to thermal annealing and probes the effect of this heat treatment on the catalyst surface structure and its oxygen reduction activity. It was found that surface alloying between Pd and Pt occurs at temperatures as low as 200 °C, and significantly alters the structure and ORR catalytic activity in the range of 200–300 °C. Our results shed lights on the thermal induced interatomic diffusion in all core-shell and thin film structures.

关键词： Monolayer Proton exchange membrane fuel cell Stability interatomic-diffusion Electrocatalysis

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