Hydroxylation strategy enhances the energy storage performance of Co2CuMn Prussian blue analogues for zinc-ion capacitors

Abstract

Prussian blue analogues (PBAs) are renowned for their distinctive structural characteristics and cost-effectiveness; however, they encounter challenges due to limited active sites and structural defects, which resulting in low capacity. In this study, we introduce a hydroxylation method to enhance the energy storage capabilities of Co2CuMn-PBAs in aqueous zinc-ion capacitors. The modified Co2CuMn-PBA electrode exhibits enhanced capacitance and rate performance, demonstrating an remarkable reversible capacitance of 232.2F/g at 0.1A/g and a rate capacitance of 85.6F/g at 2 A/g, thus positioning it as a promising cathode material for supercapacitors.