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 ...