氧化钌/石墨纳米片复合阵列电极的制备及其电容性能

通过电化学剥离法在石墨棒表面构筑了层数不等、彼此平行且垂直于基底的二维石墨纳米片(GNS)阵列, 而后采用阴极还原电沉积法在GNSs 表面均匀地包覆了一层氧化钌(RuO₂·xH₂O)薄膜, 形成了RuO₂·xH₂O/GNS 复合阵列电极. 电化学测试表明, RuO₂·xH₂O/GNS 复合阵列电极具有优良的超电容性能, 在0.5mol·L^-1 H₂SO₄电解质溶液中, 扫描速率为5 mV·s^-1, 电位窗口为0.9 V时, 其比电容高达4226 F·m^-2, 并且具有优异的循环性能, 经过20000圈充放电循环后, 电容保持率高达94.18%.

Synthesis and Electrochemical Characterization of RuO2·xH2O/Graphite Nanosheet Composite Array Electrodes for Supercapacitors

We used electrochemical exfoliation to construct graphite nanosheet (GNS) arrays, in which the varying number of nanosheet layers were parallel to each other and perpendicular to the carbon substrate. Hydrous ruthenium oxide (RuO₂·xH₂O) was then loaded directly on the surface of nanosheets using cathodic reduction electrodeposition, resulting in the formation of RuO₂·xH₂O/GNS composite array electrodes. Electrochemical measurements showed that the composite array electrodes exhibited excellent capacitive behaviors, and achieved specific capacitance values as high as 4226 F·m^-2 in the potential window up to 0.9 V, with a scan rate of 5 mV·s^-1 in 0.5 mol·L^-1 H₂SO₄ solution. The RuO₂·xH₂O/GNS composite array electrodes showed good cycling abilities, and maintained 94.18% of their maximum performance after 20000 cycles.