热处理碳纸的氧化过程及其对钒离子的电催化  

Oxidation process of carbon paper by heat-treatment and its electrocatalytic activity toward vanadium ions

作　　者：岳鹿[1] 李伟善[1] 

机构地区：[1]华南师范大学化学与环境学院,广东广州510006

出　　处：《电源技术》2010年第12期1262-1265,共4页Chinese Journal of Power Sources

摘　　要：在空气气氛下对碳纸进行热处理,用扫描电镜、拉曼光谱、红外光谱、循环伏安、电池充放电实验研究了热处理碳纸的表面状态及其对钒离子的电催化活性。实验结果表明,适当温度下对碳纸的热处理,能改善碳纸上碳纤维的表面状态,增加其表面含氧活性官能团的含量。经过500℃处理后的碳纸表面的含氧官能团数量最多。碳纸电极上这些含氧官能团特别是-OH的含量的提高,能加快钒电对电荷传递反应的发生,从而改善对VO2+/VO2+和V(Ⅱ)/V(Ⅲ)电对的催化性能。碳纸经500℃处理后,其电池在10 mA/cm2的充放电条件下,电压效率可达83.6%,库仑效率能达到到77.9%。Carbon paper was heat-treated under air atmosphere.The surface state of the treated carbon paper and its electrocatalytic activity toward vanadium ions were studied by scanning electron microscopy（SEM）,micro-Raman spectroscopy,fourier transform infrared spectroscopy（FTIR）,cyclic voltammetry and electrochemical impedance spectroscopy.The results show that the proper heat-treatment temperature of carbon paper can improve the surface state of carbon fibers and increase their surface oxygen content of active functional groups.The content of oxygen-containing groups is the most when the carbon paper is treated at 500 ℃.The increasing oxygen-containing groups especially the-OH on the surface of carbon paper can speed up the kinetics of charge transfer for vanadium redox reactions,thus greatly improving the catalytic properties toward VO2＋/VO2＋ and V（Ⅱ）/V（Ⅲ） redox reactions.The VRFB using the carbon paper treated under 500 ℃ as the electrode exhibits excellent performance under a current density of 10 mA/cm2.The voltage efficiency reaches 83.6%,coulomb efficiency reaches 77.9%.

关 键 词：钒离子 碳纸 热处理 氧化过程 催化活性 

分 类 号：TM912[电气工程—电力电子与电力传动]