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One‐Pot Hydrothermal Synthesis of Hexagonal WO 3 Nanorods/Graphene Composites as High‐Performance Electrodes for Supercapacitors
Author(s) -
Guan Xiaohui,
Zhang Ziwei,
Yang Liu,
Wang Guangsheng
Publication year - 2017
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201700288
Subject(s) - nanorod , graphene , materials science , pseudocapacitor , supercapacitor , oxide , electrode , hydrothermal circulation , composite number , hydrothermal synthesis , chemical engineering , electrochemistry , tungsten , capacitance , nanotechnology , composite material , chemistry , metallurgy , engineering
Tungsten oxide (WO 3 ) as an electrode material for supercapacitors has always suffered from low capacitance and poor rate capability. In this work, a series of WO 3 nanorods/graphene composites with different weight ratios of tungsten oxide nanorods (WO 3 NRs) and reduced graphene oxide (rGO) are synthesized successfully through a facile one‐pot electrostatic adsorptive hydrothermal method. In these composites, rGO enhances the conductivity, transporting electrons and protons to the WO 3 NRs. In addition, rGO can reinforce the structure of the WO 3 NRs during frequently occurring redox reactions. At a graphene weight ratio of 1 wt %, the specific capacitance of the WO 3 NRs/rGO composite is 343 F g −1 at a current density of 0.2 A g −1 . Compared with pure WO 3 as electrodes, the WO 3 NRs/rGO composite shows excellent specific capacity, and superior rate performance and cycling stability owing to the combined action of the double layer and pseudocapacitor. This study provides a new convenient approach to promote the electrochemical performance of tungsten oxide.