采用红外光谱、单点比表面积检测手段研究了碳纸435℃热处理前后的表面结构和比表面积的变化. 并将这类碳纸用作全钒液流氧化还原电池电极材料, 对其电化学性能进行了研究. 结果表明:热处理10h的碳纸表面有-COOH官能团生成, 比表面积显著增大, 其电化学活性增强. 热处理后的碳纸作为电极组装成的电池在电流密度50mA/cm2时有良好的充放电性能, 平均电流和电压效率达到95%和89%.
The carbon paper (CP) heat-treated at 435℃ for 10h were characterized by FTIR spectroscopy and BET, and their electrochemical behaviors were investigated by cyclic voltammograms, impedance spectroscopy and charge-discharge techniques. The results show that -COOH functional groups form after heattreated for 10h and specific surface area increases significantly. The vanadium redox battery with modified CP electrode exhibits excellent performance at current density of 50mA/cm2. The average current efficiency reaches 95% and average voltage efficiency reaches 89%. The improvement of electrochemical performance for the electrode is ascribed to the -COOH group and the special surface of CP.
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