多孔碳电极孔径结构对钒电池体系的影响讨论

Discussion on the Influence of the Pore Size of Porous Carbon Electrode on Vanadium Redox Battery System

首先,比较了不同种类的商品化多孔碳电极孔径结构的差异,研究了电极材料孔径结构对钒电池体系倍率性能的影响,结果显示,多孔碳电极的孔径结构和尺寸决定了发生电化学反应的活性物质扩散到多孔碳电极表面的快慢,孔径越大,扩散距离越长,扩散时间越久,相应的钒电池体系的倍率性能就越差;然后,通过机理分析,探讨了多孔碳电极的孔径因素对钒电池电化学倍率性能的影响。

Firstly, the differences in the pore structures of different kinds of commercial porous carbon electrodes are compared, and the influence of pore structure of the electrode material on the rate performance of vanadium battery system is studied. The results show that the pore structure and size of the porus carbon electrode determine the diffusion speed of the active material in electrochemical reaction to the surface of the porous carbon electrode. The larger the aperture is, the longer the diffusion distance and diffusion time will be, and the worse the corresponding rate performance of the vanadium battery system will be. Then, through the mechanism analysis, the influence of the pore size of the porous carbon electrode on the electrochemical rate performance of the vanadium battery is investigated.