PPy-decorated ZnCo₂O₄@Ni(OH)₂ electrode materials for flexible supercapacitor

Electrical energy storage devices (EES) play an important role in the development of portable electronic devices, power grids, and electric vehicles. Supercapacitors (SCs) become the focus of the EES field due to their high power density and high energy density. ZnCo₂O₄ ternary metal oxides show considerable potential as electrodes for SCs. In this work, Ni(OH)₂ and PPy materials are combined on the surface of ZnCo₂O₄ samples. The synthesized products possess a specific capacitance of 1256 C/g at 1 A/g and an energy density of 69 Wh/kg at 1350 W/kg. Moreover, the assembled device retains 81% of its capacity after being fully charged and discharged 10,000 times.