Interface Engineering Hybrid Znco2o4@Ni2.5mo6s6.7 Structures for Flexible Energy Storage and Alkaline Water Splitting

Designing electrodes with hybrid structures is significant for improving energy storage and conversion efficiency. Overall, single-component metal oxides suffer from poor working stability and slow ionic electron mobility.In order to solve this problem, based on the easy-to-modify properties of spinel-structured ZnCo 2 O 4 , hybrid-structure ZnCo 2 O 4 @Ni 2.5 Mo 6 S 6.7 is successfully synthesized through hydrothermal synthesis, and uniformly grown on nickel foam. Hybrid ZnCo 2 O 4 @Ni 2.5 Mo 6 S 6.7 structures exhibit high specific capacitance of 848 C g -1 at 1 A g -1 , and excellent stability. The assembled supercapacitor device reaches a high energy density of 177.9 W kg -1 at 2700 Wh kg -1 , excellent cycling performance, and mechanical flexibility.In alkaline water splitting, this hybrid structure exhibits low OER and HER overpotentials, water splitting cell voltage, and excellent stability. Furthermore, density functional theory (DFT) calculation further confirms that the hybrid structure promotes Gibbs free energy for hydrogen adsorption. And the increment of the density of total states (also) enhances HER performance.