Constructing high-performance electrode materials using core–shell ZnCo(2)O(4)@PPy nanowires for hybrid batteries and water splitting

Heterogeneity can be used as a promising method to improve the electrochemical performance of electrode materials; thus, ZnCo(2)O(4)@PPy samples were prepared using a facile hydrothermal route and an electrochemical deposition process. The as-prepared products possess a specific capacitance of 605 C g(−1) at a current density of 1 A g(−1). The asymmetric supercapacitor (ASC) possesses an energy density of 141.3 W h kg(−1) at a power density of 2700.5 W kg(−1) and capacity retention of 88.1% after 10 000 cycles, indicating its promising potential for energy devices. ZnCo(2)O(4)@PPy-50 exhibited an excellent OER performance and outstanding HER performance in alkaline media. As an advanced bifunctional electrocatalyst for overall water splitting, a voltage of 1.61 V at a current density of 50 mA cm(−2) outperforms the majority of noble-metal-free electrocatalysts.