Recent progress of high-energy density supercapacitors based on nanostructured nickel oxides

With the progressive demand of portable devices and hybrid electronic vehicles, relevant energy storage options are one of the most important practical necessities. Supercapacitors may play a key role for developing auto electronic advanced tools, because of their specific power density, fast charging capacity, and long-life time. On the other hand, nanostructured materials for supercapacitor electrodes have demonstrated great potential for constructing a reliable as well as efficient gateway for betterment. Nanostructured form of metal oxides, especially nickel oxide (NiO), is one of the most excel material to design high performance supercapacitors. This review deals with a detailed discussion on some fundamental aspects of supercapacitors incusing variety, performance evaluation criteria, and influencing factors for designing high density supercapacitors. Along with these, recent effective strategical approaches for generating high energy density supercapacitors utilizing NiO and their composites are particularly described the inherent performance influencing factors like their physical, chemical, and compositional variations. Finally, upgrading the next generation devices, the commercial application, challenges, and future prospects of the recently developed NiO-based supercapacitor materials are pointed out.