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采用电沉积法在硫酸锰溶液中制备了钛基二氧化锰电极,研究了热处理温度(100～500℃)对Ti/SnO2+SbOx/MnOx电极析氧电催化性能的影响。采用X射线衍射、红外光谱分析方法对电极结构进行了表征,通过极化曲线、循环伏安曲线和电化学阻抗研究了电极在0.5mol/L K2SO4溶液中的析氧催化活性。结果表明,热处理温度为200℃时,没有改变其γ-MnO2晶型,但是Mn-O键力增强,析氧催化活性提高;200℃以上的热处理改变了MnOx晶型,但对改善电极析氧催化性能效果不明显。
The Ti-based manganese dioxide electrode was prepared by electrodeposition in manganese sulfate solution. The effect of heat treatment temperature (100-500 ℃) on the electrocatalytic performance of Ti / SnO2 + SbOx / MnOx electrode was studied. The structure of the electrode was characterized by X-ray diffraction and infrared spectroscopy. The oxygen evolution catalytic activity of the electrode in 0.5mol / L K2SO4 solution was investigated by polarization curve, cyclic voltammetry and electrochemical impedance spectroscopy. The results show that when the temperature is 200 ℃, the γ-MnO2 crystal form is not changed, but the Mn-O bond strength is enhanced and the oxygen evolution catalytic activity is improved. The heat treatment above 200 ℃ changes the crystal form of MnOx, The catalytic performance is not obvious.