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Exfoliation and reduction of graphene oxide at low temperature and its resulting electrocapacitive properties
Authors:Li Wan  Ping Liu  Tongping Zhang  Yongxin Duan  Jianming Zhang
Affiliation:1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao, 266042, People’s Republic of China
Abstract:Low-temperature reduced graphene oxide (LT-RGO) powder with full exfoliated morphology was achieved directly from freeze-dried graphite oxide (GO) aqueous solution in air atmosphere, which is simple and energy-saving. For explaining this phenomenon, the microstructure and thermal behavior of freeze-dried GO and vacuum filtered GO film was compared. Moreover, the thermal-induced reduction process of freeze-dried GO has been in situ monitored by temperature-dependent infrared spectroscopy. The results show that freeze-dried GO demonstrates the floc morphology with larger interlayer distance than that of vacuum filtered GO film, which should be the essential reason for its low-temperature reduction and exfoliation behavior. The dispersibility and capacitance property of as-prepared LT-RGO has also been investigated. At current density of 6 A g?1, the specific capacitance of 460 F g?1 was achieved, shows that the prepared LT-RGO holds great application potential in electric energy storage.
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