电解二氧化锰的改性研究

Modification of Electrolytic Manganese Dioxide

应用液相表面处理法在电解二氧化锰表面包覆一层化学二氧化锰与铋的氧化物,形成EMD/CMD-Bi复合物.X射线衍射分析和扫描电镜显示,改性后的二氧化锰仍然保持EMD的γ-MnO2晶型,表面明显包覆了一层絮状物质,表面孔状结构增多.电化学测试表明,以改性后的二氧化锰作电极,其CV扫描第2电子还原峰电流约增大了1.5倍,电极放电容量和倍率性能显著提高,在截止电压为-0.8V(vs.HgO/Hg电极)和电流密度分别为30.8mA/g和102.7mA/g条件下,放电容量较改性前的各提高了40.8%和78.3%.

The EMD samples coated with CMD-Bi compound were prepared by liquid-phase surface treatment method. XRD and SEM research indicated that the modified manganese dioxide, i. e, EMD/CMD-Bi, could keep y-MnO2 crystal structure of EMD and had more pores on its surface with an obvious floccule layer. Electrochemical test indicated that the second electron reduction peak current increased by 1.5 times and the discharge capacity increased by 40.8% and 78.3% respectively than that of pure EMD electrode under the condition of -0.8 V（vs. Hg/HgO） cut-off voltage at 30.8 mA/g and 102.7 mA/g current density.