多孔氧化镍薄膜的制备及其超级电容器性能

以氟掺杂的SnO₂导电玻璃(FTO)为基底,通过水热法与高温煅烧法相结合成功制备出多孔氧化镍薄膜。 通过场发射扫描电子显微镜(SEM)、透射电子显微镜(TEM)、晶体粉末衍射仪(XRD)、X射线光电子能谱(XPS)等技术手段对所制备NiO进行了物相组成、表面形貌及元素价态的表征。 在6 mol/L KOH电解液中,采用循环伏安法、恒电流充放电对NiO薄膜电化学性能进行了研究。 结果表明,在电流密度为2 A/g时,NiO薄膜的比电容可达651.6 F/g,循环1000圈后其电容保留值可达71.6%,是理想的超级电容器电极材料。

Preparation and Supercapacitor Properties of Porous Nickel Oxide Film

Porous NiO film grown on the substrate of F-doped SnO₂ conductive glasses(FTO) was successfully prepared through the hydrothermal method in combination with high temperature calcination. The surface morphology, phase composition and the valence state of the obtained NiO film were detected by SEM, TEM, XRD and XPS, respectively. The electrochemical performances were characterized by cyclic voltammetry(CV) and galvanostatic charge/discharge in the electrolyte solution of 6 mol/L KOH. These results indicate that the specific capcacitance of the NiO electrode can reach 651.6 F/g at a current density of 2 A/g. After 1000 cycles 71.6% of the maximum capcacitance is still remained, suggesting its excellent cycling stability and promising application as an ideal electrode material for supercapacitors.