Synergy of Cobalt Iron Tetrathiomolybdate Coated on Cobalt Iron Carbonate Hydroxide Hydrate Nanowire Arrays for Overall Water Splitting

Electrochemical water splitting is regarded as an ideal strategy for producing hydrogen energy. However, the ability to design efficient and durable noble-metal-free catalysts for decreasing the overpotential in the electrolysis process is in high demand. Here, it is demonstrated that cobalt iron carbonate hydroxide hydrate nanowire arrays on Ti mesh (CFOC/TM) obtained through a surface anion interchange method can lead to amorphous cobalt iron tetrathiomolybdate coated on crystalline cobalt iron carbonate hydroxide hydrate nanowire arrays on Ti mesh (CFMS@CFOC/TM), which can act as an efficient and durable water splitting electrocatalyst in alkaline media. CFMS@CFOC/TM shows good performance for the oxygen evolution and hydrogen evolution reactions, with the need for low overpotentials of 237 mV and 93 mV at 10 mA cm(-2) in 1.0 M KOH, respectively. As a 3D bifunctional electrode catalyst, it enables alkaline water splitting with excellent performance, achieving 10 mA cm(-2) at a voltage of 1.63 V with a satisfying stability performance.