A High‐Performance Composite Electrode for Vanadium Redox Flow Batteries |
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| Authors: | Qi Deng Peng Huang Wen‐Xin Zhou Qiang Ma Nan Zhou Hao Xie Wei Ling Chun‐Jiao Zhou Ya‐Xia Yin Xiong‐Wei Wu Xiang‐Yang Lu Yu‐Guo Guo |
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| Institution: | 1. College of Science, and College of Bioscience and Biotechnology, Hunan Agricultural University, and Hunan Agricultural Bioengineering Research Institute, Changsha, P. R. China;2. College of Science, National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanica, College of Agronomy, Hunan Agricultural University, Changsha, P. R. China;3. Hunan Province YinFeng New Energy Co. Ltd., Changsha, P. R. China;4. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, P. R. China |
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| Abstract: | A composite electrode composed of reduced graphene oxide‐graphite felt (rGO‐GF) with excellent electrocatalytic redox reversibility toward V2+/V3+ and VO2+/VO2+ redox couples in vanadium batteries was fabricated by a facile hydrothermal method. Compared with the pristine graphite felt (GF) electrode, the rGO‐GF composite electrode possesses abundant oxygen functional groups, high electron conductivity, and outstanding stability. Its corresponding energy efficiency and discharge capacity are significantly increased by 20% and 300%, respectively, at a high current density of 150 mA cm?2. Moreover, a discharge capacity of 20 A h L?1 is obtained with a higher voltage efficiency (74.5%) and energy efficiency (72.0%), even at a large current density of 200 mA cm?2. The prepared rGO‐GF composite electrode holds great promise as a high‐performance electrode for vanadium redox flow battery (VRFB). |
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| Keywords: | composite electrodes high efficiency large current density reduced graphene oxide vanadium redox flow batteries |
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