HIERARCHICAL NICKEL OXIDE MICROFLOWER FOR HIGH-PERFORMANCE SUPERCAPACITOR

摘要

Supercapacitors have attracted growing interests as an energy storage device because of various virtues such as rapid charging-discharging at a high current, high power densities, long-term cycling stability, and low-maintenance memory backup, which also renders supercapacitors as an ideal candidate for peak-load enhancer of hybrid electric vehicles (HEVs). Among various potential metal oxides for pseudocapacitance, NiO is one of the most promising materials because of its high theoretical capacity (2,584 F/g), low cost, and natural abundance. In addition, NiO can be tailored or designed with a range of phases and morphologies through controlling synthetic routes and conditions, and thus its specific capacitance can be maximized by optimizing specific surface areas, pore volumes, and pore size distributions. Actually, NiO-based nanomaterials have been widely studied with the purpose of advancing overall performance of supercapacitors. To build high-performance supercapacitors, the synthesis of NiO should be carefully designed by taking the morphology, pore structure, and heteroatomic defects into consideration.