Three-dimensional homo-nanostructured MnO2/nanographene membranes on a macroporous electrically conductive network for high performance supercapacitors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Dajun Wu
  • Shaohui Xu
  • Chi Zhang
  • Yiping Zhu
  • Dayuan Xiong
  • Rong Huang
  • Ruijuan Qi
  • Lianwei Wang

Detail(s)

Original languageEnglish
Pages (from-to)11317-11329
Journal / PublicationJournal of Materials Chemistry A
Volume4
Issue number29
Online published21 Jun 2016
Publication statusPublished - 7 Aug 2016

Abstract

A three-step hydrothermal route was designed to fabricate three-dimensional (3D) homo-nanostructured MnO2 (MnO2-MnO2)/nanographene membranes on a macroporous and electrically conductive network (MECN). The preparation technology, structure and morphology, and electrochemical properties of samples are determined systematically. The nanographene/MECN electrode with more defects as the active surface had been synthesized by hydrothermal carbonization. The in situ growth of δ-MnO2 with a carbon-assisted reaction on the nanographene/MECN was strongly adhered to the substrate. The additional α-MnO2 with a redox reaction enhanced the mass loading of MnO2, developing the specific capacitance of the MnO2-MnO2/nanographene/MECN electrode. The materials are demonstrated as an electrode with a maximum capacitance of 4.5 F cm-2 or 179 F cm-3 (894 F g-1) at 1 mA cm-2 for 1 cm2 samples and retaining over 83% after 20000 cycles in 1 M Na2SO4. The MnO2-MnO2/nanographene/MECNAC/Ni-foam supercapacitors with high volumetric energy densities exhibit the ideal performance of a supercapacitor (1 mW h cm-3, 40.3 W h kg-1, at 1000 W kg-1), indicating a promising future for supercapacitors.

Citation Format(s)

Three-dimensional homo-nanostructured MnO2/nanographene membranes on a macroporous electrically conductive network for high performance supercapacitors. / Wu, Dajun; Xu, Shaohui; Zhang, Chi; Zhu, Yiping; Xiong, Dayuan; Huang, Rong; Qi, Ruijuan; Wang, Lianwei; Chu, Paul K.

In: Journal of Materials Chemistry A, Vol. 4, No. 29, 07.08.2016, p. 11317-11329.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review