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Enhancing Surface Strain of Intermetallic Fuel Cell Catalysts by Composition-Induced Phase Transition.
Shao, Ru-Yang; Niu, Xiangfu; Xu, Xiao-Chu; Zhou, Zhen-Hua; Chu, Shengqi; Tong, Lei; Zhang, Liang; Liang, Hai-Wei.
Afiliação
  • Shao RY; Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China.
  • Niu X; Center for Combustion Energy School of Vehicle and Mobility, Tsinghua University, Beijing 100084, People's Republic of China.
  • Xu XC; Beijing Huairou Laboratory, Beijing 101400, People's Republic of China.
  • Zhou ZH; Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China.
  • Chu S; Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China.
  • Tong L; Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
  • Zhang L; Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China.
  • Liang HW; Center for Combustion Energy School of Vehicle and Mobility, Tsinghua University, Beijing 100084, People's Republic of China.
Nano Lett ; 24(18): 5578-5584, 2024 May 08.
Article em En | MEDLINE | ID: mdl-38682925
ABSTRACT
The lattice parameter of platinum-based intermetallic compounds (IMCs), which correlates with the intrinsic activity of the oxygen reduction reaction (ORR), can be modulated by crystal phase engineering. However, the controlled preparation of IMCs with unconventional crystal structures remains highly challenging. Here, we demonstrate the synthesis of carbon-supported PtCu-based IMC catalysts with an unconventional L10 structure by a composition-regulated strategy. Experiment and machine learning reveal that the thermodynamically favorable structure changes from L11 to L10 when slight Cu atoms are substituted with Co. Benefiting from crystal-phase-induced strain enhancement, the prepared L10-type PtCu0.8Co0.2 catalyst exhibits much-enhanced mass and specific activities of 1.82 A mgPt-1 and 3.27 mA cmPt-2, which are 1.91 and 1.73 times higher than those of the L11-type PtCu catalyst, respectively. Our work highlights the important role of crystal phase in determining the surface strain of IMCs, and opens a promising avenue for the rational preparation of IMCs with different crystal phases by doping.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nano Lett Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nano Lett Ano de publicação: 2024 Tipo de documento: Article