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.
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