RuO_2/CuO复合电极材料的制备及其性能研究

Preparation and performances of RuO_2/CuO composite electrode materials

分别采用溶胶-凝胶法和低热固相反应法制备无定型水合RuO2和CuO粉末,进而制备了不同含量的RuO2/CuO复合电极,用扫描电镜对复合电极的形貌进行表征,并对复合电极进行循环伏安、交流阻抗、恒流充放电等电化学性能测试,结果表明,RuO2/CuO复合有助于获得较细颗粒和改善RuO2的阻抗特性。当CuO的含量为30%(质量分数)时,在38%的H2SO4溶液中,扫描速度为5mV/s时,复合电极的比电容为513F/g,内阻为0.361Ω,且在经过400次充放电后,比容量仍保持91.4%,可作为较理想的超级电容器电极材料。

Amorphous hydrous ruthenium oxide and copper oxide powders respectively prepared by a sol-gel process and low heat solid-state reaction. The ruthenium oxide-copper oxide composite electrodes with different copper oxide contents were prepared. The morphology of the composite electrode was investigated by SEM. Based on the cyclic voltammetry, AC impedance spectroscopy and constant current charge-discharge techniques, the performances of the electrodes were investigated. The results showed that the compositing of copper oxide and ruthenium oxide was beneficial to obtaining of fine particles and improving the impedance characteristic and conductivity. The results also showed that the composite electrode with 30% （mass fraction） copper oxide was ideal, and its specific capacitance and inner resistance were 513F/g and 0. 361%, respectively, measured at 5mV/s in 38% （mass fraction） H2SO4, after 400 cyclic-life, the specific capacitance of RuO2/CuO composite e- lectrode maintained at 91.4 %.