期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138377
关键词
Vanadium redox flow battery; Biomass lotus seed shell; Carbon felt; Electrochemical performance; Energy efficiency
资金
- 100 Talented Team of Hunan Province [XiangZu [2016] 91]
- Natural Science Foundation of Hunan Province [2020JJ5566, 2020JJ5569]
- Outstanding Young Talent Project of Hunan Provincial Education Department [19B029]
- Huxiang high-level talents program [2019RS1046]
- Hunan Provincial Science Fund for Distinguished Young Scholars [2021JJ10007]
- National Natural Science Foundation of China [52103354]
Researchers propose a strategy to improve the electrochemical performance of carbon felt (CF) electrodes by modifying them with cost-effective biomass materials. The optimized biomass-modified CF electrode showed high energy efficiency and outstanding cycling stability in vanadium redox flow batteries (VRFBs).
Vanadium redox flow batteries (VRFBs) have attracted considerable attentions for their promising applications as large-scale energy storage devices. However, the widespread implementation of VRFBs is still hindered by the severe overpotentials of redox reactions, due to the poor electrochemical activities of conventional carbon felt (CF) electrodes. Herein, we present the fabrication of biomass lotus seed shells-modified CF (Bio-CF) electrode, which exhibits remarkable electrocatalytic effects on both the V2+/V3+ and VO2+/VO(2+ )redox reactions. The influences of auxiliary sucrose concentration and pyrolysis temperature were investigated to optimize the Bio-CF electrodes. Meanwhile, molecular dynamic simulations were employed to verify the experimental data. Furthermore, high performance VRFBs were achieved with the optimized Bio-CF electrode, affording high energy efficiency (83.14 %) and outstanding cycling stability under a current density of 100 mA cm(-2). It is believed that the strategy to improve electrochemical performance of CF modified by cost-effective biomass materials provides a promising route for developing high performance VRFBs.
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