Carbon paper coated with supported tungsten trioxide as novel electrode for all-vanadium flow battery
Carbon paper coated with supported tungsten trioxide as novel electrode for all-vanadium flow battery
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DOI：
10.1016/j.jpowsour.2012.06.072
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发表时间：
2012-11
影响因子：
9.2
通讯作者：
Chuan Yao;Huamin Zhang;Tao Liu;Xianfeng Li;Zonghao Liu
中科院分区：
文献类型：
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作者：
Chuan Yao;Huamin Zhang;Tao Liu;Xianfeng Li;Zonghao Liu
为了提高碳纤维对钒氧化还原电对的电化学性能，研制了一种负载三氧化钨的碳纸电极。采用浸渍法制备了负载三氧化钨的超级活性炭（WO 3/SAC），并对其进行了X射线衍射和扫描电镜表征。用循环伏安法和电化学阻抗谱对所制备电极的电化学性能进行了评价。结果表明，WO 3/SAC具有良好的电催化活性和动力学可逆性。通过添加WO 3/SAC，正反应和负反应的电荷转移电阻都显著降低。在50 mA cm− 2下，以所制备的电极为正极的钒液流电池的库仑效率（CE）、电压效率（VE）和能量效率（EE）分别为94.5%、85.2%和80.5%，远高于以碳纸电极组装的电池。
A novel carbon paper electrode coated with supported tungsten trioxide is developed to improve the carbon fiber’s electrochemical performance toward the vanadium redox couples. Super activated carbon supported tungsten trioxide (WO3/SAC) is prepared via an impregnation method and characterized by X-ray diffraction and scanning electron microscopy. The electrochemical performance of the prepared electrode is evaluated with cyclic voltammetry and electrochemical impedance spectroscopy. Results show that WO3/SAC exhibits excellent electro-catalytic activity and kinetic reversibility toward the vanadium redox couples. By adding the WO3/SAC, the charge transfer resistances for both the positive and the negative reactions are significantly reduced. Using as prepared electrodes, the columbic efficiency (CE), voltage efficiency (VE) and energy efficiency (EE) of the vanadium redox flow battery at 50 mA cm−2are 94.5%, 85.2% and 80.5%, respectively, which are much higher than that of the cell assembled with pristine carbon paper electrodes.