In order to improve the OER performance, Ni3S2-based catalysts were directly grown on Ni substrate by simultaneously doping of Fe and compositing with reduced graphene oxide (rGO). Synthesis and loading of Ni3S2/rGO were completed during a one-step hydrothermal process, in which Ni foam acted as support and Ni source of Ni3S2, as well as the subsequent current collector. It is found that either GO or Fe salt tuned Ni3S2 nanosheets into thinner and smaller interconnected nanosheets anchored on rGO, which enhanced the charge transfer resistance and improved the active sites. Hence, as-synthesized Fe-doped Ni3S2/rGO composite at 120 degrees C (Fe-2-Ni3S2/rGO@NF-120) exhibited an enhancement on OER performances: An overpotential of 247 mV at 20 mA cm(-2), and a small Tafel slope of 63 mV dec(-1), as well as an excellent stability of: 20 h maintaining at 20 mA cm(-2) or 50 mA cm(-2). (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.