文献类型：期刊文献

英文题名：Synthesis of honeycomb MnO2 nanospheres/carbon nanoparticles/graphene composites as electrode materials for supercapacitors

作者：Xiong, Yachao[1];Zhou, Min[1];Chen, Hao[1];Feng, Lei[1];Wang, Zhao[1];Yan, Xinzhu[1];Guan, Shiyou[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：357

起止页码：1024

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20155101691368);WOS:【SCI-EXPANDED(收录号:WOS:000366216900134)】；

基金：The authors are grateful for the financial support from National Natural Science Foundation of China (no. 21274043).

语种：英文

外文关键词：Honeycomb MnO2 nanospheres; Carbon nanoparticles; Graphene; Supercapacitors

摘要：Improving the electrochemical performance of manganese dioxide (MnO2) electrodes is of great significance for supercapacitors. In this study, a novel honeycomb MnO2 nanospheres/carbon nanoparticles/graphene composites has been fabricated through freeze-drying method. The honeycomb MnO2 nanospheres are well inserted and dispersed on the graphene. Carbon nanoparticles in the composites act as spacers to effectively prevent graphene from restacking and agglomeration, construct efficient 3D conducting architecture with graphene for honeycomb MnO2 nanospheres, and alleviate the aggregation of honeycomb MnO2 nanospheres by separating them from each other. As a result, such honeycomb MnO2 nanospheres/carbon nanoparticles/graphene composites display much improved electrochemical capacitive performance of 255 F g(-1) at a current density of 0.5 A g(-1), outstanding rate capability (150 F g-1 remained at a current density of 20 A g(-1)) and good cycling stability (83% of the initial capacitance retained after 1000 charge/discharge cycles). The strategy for the synthesis of these composites is very effective. (C) 2015 Elsevier B.V. All rights reserved.