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Design and synthesis of an organic (naphthoquinone) and inorganic (RuO2) hybrid graphene hydrogel composite for asymmetric supercapacitors

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Abstract

The naphthoquinone and RuO2 hybrid graphene hydrogel (NQ–RuO2/SGH) composite, which can be a suitable positive electrode material of an asymmetric supercapacitor, is prepared via a two-step process. The RuO2/graphene hydrogel composite (RuO2/SGH) is first synthesized through a simple hydrothermal method by using oxidized graphite (GO) and RuCl3 as raw materials, and then, 1,4-naphthoquinone (NQ) molecules are adsorbed on the exposed graphene hydrogel surface of the RuO2/SGH composite via a π–π stacking interaction. The electrochemical tests show that the NQ–RuO2/SGH composite delivers a high specific capacitance (450.8 F g−1) even at a low RuO2 loading mass (14.6%), meanwhile, an asymmetric supercapacitor (ASC) is constructed by using NQ–RuO2/SGH as the positive electrode and a nitrogen-doped porous carbon material (MNC) as the negative electrode. The electrochemical measurements prove that the energy density of the ASC can reach up to 16.3 W h kg−1 in a 1 M H2SO4 electrolyte.

Graphical abstract: Design and synthesis of an organic (naphthoquinone) and inorganic (RuO2) hybrid graphene hydrogel composite for asymmetric supercapacitors

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Publication details

The article was received on 20 Apr 2018, accepted on 28 Jul 2018 and first published on 30 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ01908H
Citation: New J. Chem., 2018, Advance Article
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    Design and synthesis of an organic (naphthoquinone) and inorganic (RuO2) hybrid graphene hydrogel composite for asymmetric supercapacitors

    Z. Zhang, B. Guo, X. Wang, Z. Li, Y. Yang and Z. Hu, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ01908H

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