金属氧化物理论上具有较高的比电容,是赝电容超级电容器的主要电极材料,不同的沉积方法将直接影响到其电化学性能。首先采用阳极氧化法制备高度有序的TiO2纳米管阵列作为基底,分别采用化学沉积法和电化学沉积法(差分脉冲伏安法)沉积NiO,测试并比较所沉积NiO的电化学性能。电子扫描显微镜表征发现化学沉积的NiO颗粒较大未能均匀沉积,电化学沉积法沉积形成的NiO颗粒较小且均匀附着在纳米管中。恒流充放电结果显示电化学沉积法制备的复合电极获得了60mF/cm2的比电容,可以用作电化学超级电容器的电极材料。
Metal oxides is the main materials for supercapacitor electrode and have high theoretical specific capacitance for supercapacitors,different methods of deposition will affect their electrochemical performance directly.Anodic oxidation were first introduced for the preparation of highly ordered titanium dioxide nanotubes array as a base,NiO in the TiO2 nanotubes were deposited by chemical deposition and electrochemical deposition (differential pulse voltammetry) respectively,the electrochemical performance of deposited nickel oxide were tested and compared.Scanning electron microscope (SEM) found that chemical deposition of nickel oxide particles were bigger and nonuniform deposition,electrochemical deposition of nickel oxide particles were smaller and attached in the nanotubes uniformly.The results of constant current charge and discharge showed that the composite electrode by electrochemical deposition method had a specific capacitance of 60mF/cm2 and can be used as electrochemical supercapacitors electrode materials.
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基金资助
国家“863”计划(2013AA041100);国家自然科学基金(51205275和51205276);山西省人社部留学人员科技活动项目择优资助(153050010-C)
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