烧结温度对Ti/RuO_2-CeO_2超电容性能的影响

Effects of Sintering Temperature on Ti/RuO_2-CeO_2 Electrodes Applied in Super-Capacitors

以三氯化钌和三氯化铈为原料,以无水乙醇为溶剂,采用热分解法在钛基材上制备了Ti/RuO2-CeO2二元氧化物涂层电极材料,利用XRD,SEM,HR-TEM分析方法对涂层组织结构进行表征,通过循环伏安和充放电曲线来研究涂层的超电容性质。结果表明,300℃烧结制备的电极可获得最大的比电容;烧结温度低于或者超过300℃,电极的超电容性能不佳。分析表明,Ti/RuO2-CeO2的超电容性能与其结构密切相关,氧化物的结构未稳定或发育良好,均不利于提高超电容性能。300℃时涂层形成带有纳米级微晶的非晶组织,获得了高的活性点数和电化学粗糙度。

RuO2-CeO2/Ti electrodes were prepared by thermal decomposition,taking RuC13 and CeC13 as raw material, ethanol as solvent and Ti slide as substrate.The microstructures were investigated by means of XRD, SEM and HRTEM. The supercapacitive properties were examined by cyclic voltammetric and chronopotentiometry measurements. The results showed that the highest specific capacitance was obtained in the electrodes prepared at 300 ~C, and the electrodes at higher or lower sintering temperature had lower specific capacitances. It is indicated that the capacitive properties of the Ti/RuO2-CeO2 electrodes were influenced by their microstructures. The unstable or well developed structure of the oxides was not good for the supercapacitor performance of the electrodes. In the electrodes prepared at 300 ℃, the amorphous structure with nanocrystals could be found. This kind of microstructure had more electroactive points and lager electrochemical roughness.