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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Acknowledgements
The financial supports from Natural Science Foundation of China (20804004 and 21274071), Taishan Mountain Scholar Constructive Engineering Foundation (TS20081120), and Natural Science Fund for Distinguished Young Scholars of Shandong Province (JQ200905) are greatly appreciated.
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Wan, L., Liu, P., Zhang, T. et al. Exfoliation and reduction of graphene oxide at low temperature and its resulting electrocapacitive properties. J Mater Sci 49, 4989–4997 (2014). https://doi.org/10.1007/s10853-014-8201-8
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DOI: https://doi.org/10.1007/s10853-014-8201-8