Edge Porous NiO Hexagonal Nanosheets as Electrode Materials for Supercapacitors

Utilization of two-dimensional materials containing high specific surface area and suitable pore size for elec-trode materials in supercapacitors is proving to be a promising strategy for energy storage and energy con-version. Transition metal oxides with high natural abundance as well as excellent electrochemical properties have been investigated. NiO materials have been widely used as pseudocapacitors in aqueous electrolytes. However, different synthesis methods can markedly affect the electrochemical performance and lifetime of the materials. In this work, the Ni(OH)2 precursors were etched with ammonia at high temperature and pressure using a hydrothermal approach, which resulted in a material with a suitable pore size and a large number of active sites on the edge part. Electrochemical tests and characterization revealed the superiority of the mate-rials prepared by this synthetic method as pseudocapacitors electrode materials as well as a new synthetic idea for commercial production.

Automated summary

Utilizing two-dimensional materials with high specific surface area and suitable pore size as electrode materials in supercapacitors is a promising strategy for energy storage and conversion. In this study, Ni(OH)2 precursors were etched with ammonia under high temperature and pressure using a hydrothermal approach, resulting in materials with suitable pore size and a large number of active sites on the edge part. The materials prepared by this synthetic method showed superior electrochemical performance as pseudocapacitor electrode materials, and also provided a new synthetic idea for commercial production.