Abstract
A mild and simple synthesis process for large-scale vanadium redox flow batteries (VRFBs) energy storage systems is desirable. A graphite felt/MnO2 (GF-MNO) composite electrode with excellent electrocatalytic activity towards VO2+/VO2+ redox couples in a VRFB was synthesized by a one-step hydrothermal process. The resulting GF-MNO electrodes possess improved electrochemical kinetic reversibility of the vanadium redox reactions compared to pristine GF electrodes, and the corresponding energy efficiency and discharge capacity at 150 mA cm−2 are increased by 12.5% and 40%, respectively. The discharge capacity is maintained at 4.8 A h L−1 at the ultrahigh current density of 250 mA cm−2. Above all, 80% of the energy efficiency of the GFMNO composite electrodes is retained after 120 charge-discharge cycles at 150 mA cm−2. Furthermore, these electrodes demonstrated that more evenly distributed catalytic active sites were obtained from the MnO2 particles under acidic conditions. The proposed synthetic route is facile, and the raw materials are low cost and environmentally friendly. Therefore, these novel GFMNO electrodes hold great promise in large-scale vanadium redox flow battery energy storage systems.
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Acknowledgements
This work was supported by the Ministry of Science and Technology of China (2016YFA0202500), the National Natural Science Foundation of China (51772093), the National key Research and Development Program of China (2017YFD0301507).
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Ma, Q., Deng, Q., Sheng, H. et al. High electro-catalytic graphite felt/MnO2 composite electrodes for vanadium redox flow batteries. Sci. China Chem. 61, 732–738 (2018). https://doi.org/10.1007/s11426-017-9235-6
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DOI: https://doi.org/10.1007/s11426-017-9235-6