Design and synthesis of an organic (naphthoquinone) and inorganic (RuO2) hybrid graphene hydrogel composite for asymmetric supercapacitors. (15th August 2018)

• Record Type: Journal Article
• Authors: Zhang, Ziyu; Guo, Bingshu; Wang, Xiaotong; Li, Zhimin; Yang, Yuying; Hu, Zhongai
• Is Part Of: New journal of chemistry. Volume 42:Number 18(2018)
• Page Start: 14956
• Page End: 14964
• Publication Date: 2018-08-15
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj01908h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The NQ–RuO2 /SGH composite reveals an electrochemically positive synergy based on the properties of its organic and inorganic molecules (NQ and RuO2 ). 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 H2 SO4 electrolyte.