• 文献标题:   Effects of highly crumpled graphene nanosheets on the electrochemical performances of pseudocapacitor electrode materials
  • 文献类型:   Article
  • 作  者:   AN CH, WANG YJ, LI L, QIU FY, XU YN, XU CC, HUANG YN, JIAO F, YUAN HT
  • 作者关键词:   graphene sheet, nickel phosphide, composite, electrochemical performance, effects of graphene sheet
  • 出版物名称:   ELECTROCHIMICA ACTA
  • ISSN:   0013-4686 EI 1873-3859
  • 通讯作者地址:   Nankai Univ
  • 被引频次:   24
  • DOI:   10.1016/j.electacta.2014.04.056
  • 出版年:   2014

▎ 摘  要

Highly crumpled graphene nanosheets (GS) with a BET surface area as high as 722.1 m(2) g(-1) is prepared by a thermal exfoliation method. A systematical investigation is performed on the electrochemical performances of porous Ni2P/GS nanocomposite synthesized by the low temperature solid state reaction method. It is shown that Ni2P nanoparticles anchor on graphene sheets producing a porous structure and GS have beneficial effects on the electrochemical properties of Ni2P nanoparticles when investigated as pseudocapacitor materials. The novel Ni2P/GS composite electrode exhibits a superior specific capacitance of 1912 F g(-1) and 888 F g(-1) at current densities of 5 and 50 mA cm(-2), respectively. The specific capacitance decreases to 1473 F g(-1) after 2500 cycles, suggesting its excellent cycling stability. It is confirmed that the GS with good electrical conductivity serve as a conducting network for fast electron transfer between the active materials and charge collector, as well as buffered spaces to accommodate the volume expansion/contraction during cycling, thus, leading to enhancement of the electrochemical properties of the Ni2P electrode. (C) 2014 Elsevier Ltd. All rights reserved.