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-O-2 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, YM[1]

机构：[1]Dongguk Univ Seoul, Dept Energy & Mat Engn, Seoul 04620, South Korea;[2]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Guizhou, Peoples R China;[3]Univ Queensland, AIBN, Sch Chem Engn, Brisbane, Qld 4072, Australia;[4]Kyung Hee Univ, Dept Plant & Environm New Resources, 1732 Deogyeong Daero, Yongin 446701, Gyeonggi Do, South Korea

第一机构：Dongguk Univ Seoul, Dept Energy & Mat Engn, Seoul 04620, South Korea

通信机构：corresponding author), Dongguk Univ Seoul, Dept Energy & Mat Engn, 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);WOS:【SCI-EXPANDED(收录号:WOS:000437106300034)】；

基金：Ziwei Li, Junghoon Yang and Daniel Adjei Agyeman contributed equally to this work. Dr Z. Li acknowledges the financial support from the National Natural Science Foundation of China (grant number 21606057) and the Science and Technology Department of Guizhou Province (grant number [2016]1061). Y.-M. Kang would like to acknowledge the financial supports from National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2017R1A5A1015365 and NRF-2017R1A2B3004383), as well as by an International Energy Joint R&D Program (20168510011350) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Ministry of Knowledge Economy, Korean government.

语种：英文

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

摘要：A great challenge in the application of carbon-based materials to Li-O-2 batteries is to prevent the formation of carbonate-based side products, thereby extending the cycle life of Li-O-2 batteries. Herein, for the first time, CNT@Ni@NiCo silicate core-shell nanocomposite is designed and used as a cathode catalyst in Li-O-2 batteries. This nanocomposite shows a promising electrochemical performance with a discharge capacity of 10 046 mA h g(cat)(-1) and a low overpotential of 1.44 V at a current density of 200 mA g(cat)(-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-O-2 batteries.