文献类型：期刊文献

英文题名：Synthesis of Ni(OH)2/RGO pseudocomposite on nickel foam for supercapacitors with superior performance

作者：Min, Shudi[1,2];Zhao, Chongjun[1];Zhang, Zhuomin[1];Chen, Guorong[1];Qian, Xiuzhen[1];Guo, Zaiping[2]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia

年份：2015

卷号：3

期号：7

起止页码：3641

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20150700534233);WOS:【SCI-EXPANDED(收录号:WOS:000349447200051)】；

基金：We are grateful for the support of the National Natural Science Foundation of China (no. 20504026), the Shanghai Natural Science Foundation (no. 13ZR1411900), the Shanghai Leading Academic Discipline Project (B502), the Shanghai Key Laboratory Project (08DZ2230500), the EU FP7 Staff Exchange program (no. PIRSES-GA-2012-318990-ELEKTRONANOMAT), the Australian Research Council (ARC) through an ARC Discovery project (DP1094261), the Fundamental Research Funds for the Central Universities, and the China Scholarship Council.

语种：英文

外文关键词：Particle size - Composite films - Electrodes - Graphene - Nickel oxide - Redox reactions

摘要：A unique structure consisting of two kinds of Ni(OH)(2) layers on the top and the bottom, respectively, of the same reduced graphene oxide (RGO) layer has been designed and synthesized through a facile hydrothermal process. The lower layer of Ni(OH)(2), covered with a thin RGO film, is transformed in situ from the surface of a Ni foam substrate through the redox reaction of elemental Ni and graphene oxide (GO), while the upper layer of Ni(OH)(2) nanoflakes from Ni ions in the solution is vertically assembled on the top surface of the RGO of the lower RGO/Ni(OH)(2) layer. This composite can be regarded as combining RGO with a "pseudocomposite" of Ni(OH)(2) material because the upper and lower Ni(OH)(2) layers are different in morphology, particle size, and Ni2+ source. The bottom layer mainly acts as a rough support, while the upper Ni(OH)(2) is suitable to act as the main active material for supercapacitor electrodes. The lower layer of Ni(OH)(2)/RGO, however, plays key roles in forming the aligned structure and in the subsequent cycling stability. The composite film has a high areal mass loading of 4.7 mg cm(-2), and superior supercapacitor performance. It features a specific capacitance of up to 15.65 F cm(-2) (i.e., 3328.7 F g(-1)) at a current density of 7 mA cm(-2) (1.5 A g(-1)) and a capacity retention of 90.6%, even after 5000 cycles at the high rate of 20 mA cm(-2) (4.3 A g(-1)), indicating that it has a promising application as an efficient electrode for high-performance supercapacitors.