• 文献标题:   Electrochemical analysis of CO3(PO4)(2).4H(2)O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors
  • 文献类型:   Article
  • 作  者:   MIRGHNI AA, MOMODU D, OYEDOTUN KO, DANGBEGNON JK, MANYALA N
  • 作者关键词:   graphene, cobalt phosphate, ironcarbonized polyaniline, hybrid capacitors: energy storage
  • 出版物名称:   ELECTROCHIMICA ACTA
  • ISSN:   0013-4686 EI 1873-3859
  • 通讯作者地址:   Univ Pretoria
  • 被引频次:   4
  • DOI:   10.1016/j.electacta.2018.06.181
  • 出版年:   2018

▎ 摘  要

In this paper, we explore the successful hydrothermal approach to make Co-3(PO4)(2).4H(2)O/GF micro-flakes composite material. The unique sheet-like structure of the graphene foam (GF) significantly improved the conductivity of the pristine Co-based material, which is a key limitation in supercapacitors application. The composite electrode material exhibited superior capacitive conduct in 6 M KOH aqueous electrolyte in a 3-electrode set-up as compared to the pristine cobalt phosphate material. The material was subsequently adopted as a cathode in an asymmetric cell configuration with carbonization of Fe cations adsorbed onto polyaniline (PANI) (C-Fe/PANI), as the anode. The Co-3(PO4)(2).4H(2)O/GF//C-FP hybrid device showed outstanding long life cycling stability of approximately 99% without degradation up to 10000 cycles. A specific energy density as high as 24Whkg(-1), with a corresponding power density of 468 W kg(-1) was achieved for the device. The results demonstrated the efficient utilization of the faradictype Co-3(PO4)(2).4H(2)O/GF composite along with a functionalized carbonaceous electric double layer (EDL)-type material to produce a hybrid device with promising features suitable for energy storage applications. (C) 2018 Elsevier Ltd. All rights reserved.