@article{dc909390ede947af9fdfd6e4b55e0d37,
title = "Generalized preparation of Au NP @ Ni(OH)2 yolk-shell NPs and their enhanced catalytic activity",
abstract = "Yolk-shell nanostructures have attracted considerable attention because of their unique properties and promising applications. Yet, synthesis of well-defined yolk-shell structures with controllable composition remains a major challenge. Here, we report a general method to fabricate Au NP @ Ni(OH)2 yolk-shell NPs. Au cores with various diameters and shapes can be successfully encapsulated into the Ni(OH)2 shells by a similar approach. When the diameter of the core Au NPs changed from ~15 to ~90 nm, the size of the yolk-shell NPs accordingly grew from ~110 to ~380 nm, however, the shell thickness of the final yolk-shell NPs is in the narrow range of 18–20 nm. The synergistic contribution from both Au and Ni(OH)2 has endowed the yolk-shell heterostructure with enhanced catalytic activity. As shown in the oxygen-evolution reactions (OER) tests, the OER activity of Au NP @ Ni(OH)2 yolk-shell NPs is 8.7 and 86-fold higher than that of hollow Ni(OH)2 NPs alone and Au NP @C (5%) (Au NPs (5%) mixed with Carbon Black), respectively. In general, our method provides a simple and novel strategy towards the fabrication of yolk-shell structures with superior catalytic activity for OER.",
keywords = "Au NPs, General approach, Hollow, Oxygen evolution, Yolk-shelled structure",
author = "Ren Cai and Haiyan Jin and Dan Yang and Lin, {Keng Te} and Kitying Chan and Jianke Sun and Zhuo Chen and Xiaobing Zhang and Weihong Tan",
note = "Funding Information: The authors are grateful to Dr. Kathryn Williams for her critical comments during the preparation of this manuscript. The authors appreciate Dr. Jong Hoon Lee (Central Research Facilities, Ulsan National Institute of Science and Engineering (UNIST), South Korea) for the HR-TEM measurements. The authors appreciate Dr. Liang Yan (Institute of High Energy Physics, Chinese Academy of Science (CAS), China) for the ion coupled plasma (ICP) experiments. The authors appreciate Dr. Shengjie Peng (Nanjing University of Aeronautics and Astronautics, China) for the discussion of OER experiments. This work is partially supported by NSFC grants (NSFC 21827811) and the Science and Technology Project of Hunan Province (2017XK2103), Hunan Provincial Key Area R&D Program (2019SK2201). Funding Information: The authors are grateful to Dr. Kathryn Williams for her critical comments during the preparation of this manuscript. The authors appreciate Dr. Jong Hoon Lee (Central Research Facilities, Ulsan National Institute of Science and Engineering (UNIST), South Korea) for the HR-TEM measurements. The authors appreciate Dr. Liang Yan (Institute of High Energy Physics, Chinese Academy of Science (CAS), China) for the ion coupled plasma (ICP) experiments. The authors appreciate Dr. Shengjie Peng (Nanjing University of Aeronautics and Astronautics, China) for the discussion of OER experiments. This work is partially supported by NSFC grants (NSFC 21827811 ) and the Science and Technology Project of Hunan Province ( 2017XK2103 ), Hunan Provincial Key Area R&D Program ( 2019SK2201 ). Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",
year = "2020",
month = may,
doi = "10.1016/j.nanoen.2020.104542",
language = "English",
volume = "71",
journal = "Nano Energy",
issn = "2211-2855",
publisher = "Elsevier B.V.",
}