The nanoporous microspheres of Co-Zn-S were synthesized by a solvothermal method. The as-obtained Co-Zn-S microspheres, as a non-noble metal catalyst, exhibited highly electrocatalytic activity for oxygen evolution reaction (OER) in alkaline electrolyte. It showed a low overpotential of only 320 mV to afford a current density of 10 mA cm(-2) and a Tafel slope of 80.43 mV dec(-1). Furthermore, the nanoporous microspheres of Co-Zn-S retained excellent electrocatalytic stability within a period of 36000 s. The catalyst also showed good catalytic performance toward the hydrolysis of ammonia borane to produce around 70 mL of H-2 within the time of 30 minutes at room temperature. The nanoporous microspheres of Co-Zn-S exhibits the potential applications for hydrogen/oxygen production by water splitting or ammonia borane hydrolysis. (C) 2019 The Electrochemical Society.