钛基RuO2-Ta2O5涂层电极材料的电容性能分析

采用热分解方法在钛基体上制备了(36%)RuO2-(64%)Ta2O5混合氧化物涂层。采用X射线衍射(XRD)、扫描电镜(SEM)、循环伏安(CV)以及恒流充放电测试研究了涂层电极的组织结构、表面形貌以及电容性能。结果表明:(36%)RuO2-(64%)Ta2O5涂层以非晶氧化物为基体,带有少量纳米微晶RuO2的组织结构。在酸性溶液中,在50～900 mV/s的扫描速度下,Ti/(36%)RuO2-(64%)Ta2O5涂层电极的伏安曲线都具有近似矩形形状,表现出良好的电容特性和功率特性。以5 mA/cm2和10 mA/cm2放电,比电容分别为525.5 F/g和495.1 F/g。在经历2000次循环充放电后,电极的电荷储存能力仍未衰减,显示其优异的循环稳定性。

Preparation and capacitance performance of Ti/RuO2-Ta2O5 electrodes

A amorphous/crystal mixed structural 36%RuO2-64% Ta2O5 coating was deposited on titanium substrate from ethanol ruthenium and tantalum chloride solution,using the thermal decomposition method at 300 ℃.Structure and electrochemical capacitive properties of the coating were investigated by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),cyclic voltammetry(CV) and galvanostatic charge-discharge tests.The XRD results reveal the 36%RuO2-64%Ta2O5 coating presents amorphous structure with some nano-size crystallites in the amorphous matrix.The electrochemical analysis shows that the Ti/36%RuO2-64%Ta2O5 electrode exhibits typical capacitive characteristics and good power characteristics in 0.5 mol/L H2SO4 electrolyte.Its specific capacitance as single electrode is up to 525.5 and 495.1 F/g(RuO2) at a discharge current of 5 and 10 mA/cm2,respectively.Excellent cycling behavior is observed for this coating,with no loss in specific capacitance during 2000 cycles.