DataVXACS Applied Materials & InterfacesPaper
journal article·2019-12-18Open access

Probing the Origin of Gold Dissolution and Tunneling Across Ni2P Shell Using in situ Transmission Electron Microscopy

Shaobo Han, Tianwu Chen, Chao Cai, Dongsheng He, Sean Li, Xia Xiang, XiaoTao Zu, Sulin Zhang, Meng Gu

ACS Applied Materials & Interfaces· Volume 11· Issue 50
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Source abstract

Abstract

Hybrid core–shell catalysts possess superior physiochemical properties that are closely related to their atomic structures. Here, we report novel diffusion phenomena in an Au–Ni2P yolk–shell structure using in situ heating transmission electron microscopy (TEM) analysis. The Au yolks can dissolve completely into and diffuse across the Ni2P shell at 500 °C, resulting in an inward volume expansion of the Ni2P shell and shrinkage of the void. The dissolved Au is subsequently segregated, forming a new crystal on the outer layer of the shell. A detailed atomic-scale resolution imaging revealed that the outward Au diffusion and aggregation occur when the Au yolks are epitaxial to the Ni2P shells. Theoretical analysis shows that the outward diffusion and deposition of Au atoms is primarily driven by the excess epitaxial strain energy.
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Research context

Catalysis & surfacesMaterials processing

OpenAlex topics: Healthcare Policy and Management · Healthcare Operations and Scheduling Optimization · Primary Care and Health Outcomes

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Affiliations

School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China

Department of Materials Science and Engineering, Southern University of Science and Technology, No. 1088 Xueyuan Blvd, Shenzhen, Guangdong 518055, China

Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States

School of Materials Science and Engineering, The University of New South Wales, Sydney 2052, Australia

Funding

Development and Reform Commission of Shenzhen Municipality · National Natural Science Foundation of China

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