@article{2dcd621b1f164ca6b1b590db6f757ff3,
title = "Probing the Origin of Gold Dissolution and Tunneling across Ni2P Shell Using in situ Transmission Electron Microscopy",
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.",
author = "Shaobo Han and Tianwu Chen and Chao Cai and Dongsheng He and Sean Li and Xia Xiang and Xiaotao Zu and Sulin Zhang and Meng Gu",
note = "Funding Information: This work was supported by the National Natural Science Foundation of China (No. 21802065), Shenzhen Clean Energy Research Institute (No. CERI-KY-2019-003), and the NSAF Joint Foundation of China (U1630126 and U1230124). This work was supported by the Pico Center at SUSTech CRF that receives support from Presidential fund and Development and Reform Commission of Shenzhen Municipality. Funding Information: This work was supported by the National Natural Science Foundation of China (No. 21802065), Shenzhen Clean Energy Research Institute (No. CERI-KY-2019-003), and the NSAF Joint Foundation of China (U1630126 and U1230124). This work was supported by the Pico Center at SUSTech CRF that receives support from Presidential fund and Development and Reform Commission of Shenzhen Municipality. Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = dec,
day = "18",
doi = "10.1021/acsami.9b17531",
language = "English (US)",
volume = "11",
pages = "46947--46952",
journal = "ACS Applied Materials and Interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "50",
}