文献类型：期刊文献

英文题名：CNT@Ni@Ni-Co silicate core-shell nanocomposite: A synergistic triple-coaxial catalyst for enhancing catalytic activity and controlling side products for Li-O2 batteries

作者：Li, Ziwei Yang, Junghoon Agyeman, Daniel Adjei Park, Mihui Tamakloe, Wilson Yamauchi, Yusuke Kang, Yong-Mook

第一作者：李自卫;Li, Ziwei

通信作者：Kang, Yong-Mook

机构：[1] Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, 04620, Korea, Republic of; [2] School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [3] School of Chemical Engineering, Australian Institute for Bioengineering and Nanotechnology [AIBN], University of Queensland, Brisbane, QLD, 4072, Australia; [4] Department of Plant and Environmental New Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si Gyeonggi-do, 446-701, Korea, Republic of

第一机构：Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, 04620, Korea, Republic of

通信机构：Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, 04620, South Korea

年份：2018

卷号：6

期号：22

起止页码：10447-10455

外文期刊名：Journal of Materials Chemistry A

收录：EI(收录号：20182405303648);Scopus(收录号：2-s2.0-85048230526)

语种：英文

外文关键词：Cathodes - Lithium-air batteries - Nanocatalysts - Catalyst activity - Nanoparticles - Nanocomposites - Oxygen - Lithium compounds - Shells (structures) - Electrolytic reduction - Binary alloys - Nickel compounds - X ray photoelectron spectroscopy

摘要：A great challenge in the application of carbon-based materials to Li-O2 batteries is to prevent the formation of carbonate-based side products, thereby extending the cycle life of Li-O2 batteries. Herein, for the first time, CNT@Ni@NiCo silicate core-shell nanocomposite is designed and used as a cathode catalyst in Li-O2 batteries. This nanocomposite shows a promising electrochemical performance with a discharge capacity of 10 046 mA h gcat-1 and a low overpotential of 1.44 V at a current density of 200 mA gcat-1, and it can sustain for more than 50 cycles within the voltage range of 2-4.7 V. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) characterizations prove that the formation of Li2CO3 and other side products are prevented, likely due to the encapsulation of CNTs by NiCo silicates and Ni nanoparticles, which may help decompose the side products. Finally, the synergistic effects, which are contributed by the high electrical conductivity of CNTs, high surface area, the high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities of NiCo silicate, and the simple decomposition of side products by Ni nanoparticles enable outstanding performance of the CNT@Ni@NiCo silicate core-shell nanocomposite as a cathode catalyst for Li-O2 batteries. ? The Royal Society of Chemistry 2018.