Hierarchical free-standing networks of MnCo2S4 as efficient Electrocatalyst for oxygen evolution reaction

Abstract The development of highly efficient, stable and cost-effective electrocatalyst for oxygen evolution reaction (OER) is critical. Herein, we report growth of MnCo 2 S 4 flakes on SS-mesh using two-step strategy, and used as an efficient, highly active and stable electrocatalyst for OER under alkaline condition. The free-standing electrocatalyst delivers exceptional stability of 100 h and activity for OER with overpotential of 290 mV at a current density of 10 mA cm −2 in 1 M KOH. The enhanced electrocatalytic performance was supported experimentally by electrochemical impedance spectra and measurement of the electrochemically active surface area. The high electrochemical active surface area and electrical conductivity of MnCo 2 S 4 flakes played an essential role in their high electrocatalytic performance.