Ordered mesoporous nickel cobaltite spinel with ultra-high supercapacitance

Abstract

Mesoporous nickel cobaltite supercapacitor electrodes with ultra-high capacitance were developed by simultaneously tailoring electrode conductivity, pore size dispersion, and crystallinity. High active mass loading (>10 mg cm⁻²) enables the feasibility for such electrodes being used in practical devices. At a current density of 28.6 A g⁻¹ (equivalent to 10 kW kg⁻¹ power density), the best performance of 8.2 F cm⁻² was achieved. The principles illustrated as the motivation of the current work are believed to be able to serve as guidelines for designing future high-performance electrodes.