Bifunctional ZnCo2S4@CoZn13 hybrid electrocatalysts for high efficient overall water splitting

To develop highly active and low-cost electrocatalyst is very important to improve the efficiency of water splitting. However, the current catalysts still present serious challenges due to the poor intrinsic activity and high overpotential. Herein, we report several amino induced Co-based composite catalysts. As a structure-mediating agent, ethylenediamine (EDA) can not only regulate the crystal structure and but also provide many surface amino groups. The obtained ZnCo2S4/CoZn13 catalysts show an excellent oxygen evolution reaction (OER) performance (274 [email protected] mA cm−2) and the overpotential of 160 mV at −10 mA cm−2 for hydrogen evolution reaction (HER). For electrolysis of water, the electrocatalysts deliver a cell voltage of 1.61 V at 50 mA cm−2. This study provides a facile synthetic strategy to construct advanced electrocatalysts for future applications.