Zn0.76Co0.24S/CoS2 nanowires array for efficient electrochemical splitting of water

In this paper, we report the use of Zn 0.76 Co 0.24 S/CoS 2 nanowires array on Ti mesh (Zn-Co-S/TM) topotactically derived from ZnCo 2 O 4 nanowires array precursor as a durable and efficient bifunctional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalyst in strongly alkaline media. This Zn-Co-S/TM electrode drives 20   mA cm −2 at 238   mV HER overpotential and 20   mA cm −2 at 330   mV OER overpotential. The corresponding two-electrode alkaline water-splitting system achieves 10   mA cm −2 at a cell voltage of 1.66   V.