镍-铋复合氧化物的制备及其在三电极体系中的赝电容行为

Synthesis of nickel-bismuth oxide composite and its electrochemical capacitive behaviors

采用溶剂热法合成镍-铋氢氧化物复合前驱体,后经热处理将其转化为镍-铋复合氧化物。采用X射线衍射(XRD)、场发射扫描电镜(FESEM)对复合氧化物的结构和形貌进行了表征。运用循环伏安法和恒电流充放电等电化学方法对其电化学电容性能进行了研究。测试结果表明,复合氧化物中组分间的配比是材料取得良好电容性能的关键因素。通过对比研究,优化出复合氧化物的最佳配比,并充分讨论了该复合氧化物作为单电极时的能量及功率密度。

A nickebbismuth oxide composite was firstly synthesized by thermally treating the nickel-bismuth hy- droxide,which was obtained through simultaneous solvotherrnal hydrolyzation of nickel and bismuth salt in N, N-dimethyl formamide（DMF）at 180℃. The structure and morphology of the composites were characterized using powder X？ ray dif- fraction（XRD）and field emission scanning electron microscopy（FESEM）. The electrochemical behaviors were measured by cyclic voltammogram（CV）and galvanostatic charge？ discharge. The results showed that the molar ratio in nickel-bismuth oxide composite was a key factor to achieve excellent capacitance performance. The optimal ratio of the composite was given by means of the parallel experiments. Furthermore, the power density and energy density were discussed in detail when the resulting composite was used as single electrode for supercapacitors.