(1. 福州大学 材料科学与工程学院，福州 350108；
2. 厦门理工学院 材料科学与工程学院，厦门 361024)
摘 要: 采用热分解法在270℃制备钛基RuO2-TiO2氧化物涂层电极材料。利用循环伏安、电化学阻抗谱等方法研究Ti/RuO2-TiO2电极分别在0.5 mol/L H2SO4、0.5 mol/L Na2SO4和 1.0 mol/L NaOH电解液中的超电容行为。结果表明：在酸性溶液和碱性溶液中Ti/RuO2-TiO2电极有较低的电荷转移电阻和优异的赝电容特性，比电容分别达到550 F/g和578 F/g；而在Na2SO4溶液中，该电极的电荷转移电阻较高，表现为典型的双电层电容特征，比电容仅为335 F/g；经历2000次循环充放电测试后，该电极在中性Na2SO4溶液中的稳定性最高，荷电能力仅下降3%；在酸性H2SO4溶液和碱性NaOH溶液中，该电极的荷电能力分别下降17%和29%。结合SEM和能谱分析可知：RuO2-TiO2在Na2SO4溶液中几乎不发生腐蚀，表现出良好的循环稳定性；RuO2-TiO2涂层在NaOH溶液中发生严重的面腐蚀，而在H2SO4溶液中则发生严重的点蚀，导致活性氧化物减少，荷电能力下降。
关键字: 超级电容器；氧化物阳极；电解液；反应机理
（1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;
2. College of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China）
Abstract:RuO2-TiO2 coating were prepared by thermal decomposition method on pure titanium TA2 substrate at 270 ℃. The supercapacitor behavior of RuO2-TiO2 coating was investigated by cyclic voltammetry(CV), electrochemical impedance spectroscopy (EIS) and charging-discharging test in 0.5 mol/L H2SO4, 0.5 mol/L Na2SO4 and 1.0 mol/L NaOH electrolytes, respectively. The results show that the Ti/RuO2-TiO2 electrode has low charge transfer resistance in acidic and alkaline electrolytes, and the specific capacitance of 550 F/g and 578 F/g are obtained in these two electrolytes, respectively. Conversely, the electrode has relative higher charge transfer resistance and lower specific capacitance (335 F/g) in neutral Na2SO4 electrolyte than that of in acidic and alkaline electrolytes. However, the electrode losing 17% and 29% of the maximum capacity after 2000 charging-discharging cycles in acidic and alkaline electrolytes, respectively, but just only 3% lost in neutral Na2SO4 solution. Combined with the SEM and EDS analysis, the electrode is hardly corroded in Na2SO4 solution, thus exhibits good cycle stability. In contrast, Ti/RuO2-TiO2 electrodes occur serious surface corrosion in NaOH solution, while occurring serious pitting corrosion in H2SO4 solution. Severe corrosion results in a significantly reduction of active substance, and thus reduces the charge capacity of the electrode.
Key words: supercapacitor; oxide anode; electrolyte; reaction mechanism
