Hierarchical Sea Urchin‐like Fe‐doped Heazlewoodite for High‐Efficient Oxygen Evolution

Abstract

Electrochemical water‐splitting to produce hydrogen is potential to substitute the traditional industrial coal gasification, but the oxygen evolution kinetics at the anode remains sluggish. In this paper, sea urchin‐like Fe doped Ni3S2 catalyst growing on nickel foam (NF) substrate is constructed via a simple two‐step strategy, including surface iron activation and post sulfuration process. The NF‐Fe‐Ni3S2 obtains at temperature of 130 ℃ (NF‐Fe‐Ni3S2‐130) features nanoneedle‐like arrays which are vertically grown on the particles to form sea urchin‐like morphology, features high electrochemical surface area. As oxygen evolution catalyst, NF‐Fe‐Ni3S2‐130 exhibits excellent oxygen evolution activities, fast reaction kinetics, and superior reaction stability. The excellent OER performance of sea urchin‐like NF‐Fe‐Ni3S2‐130 is mainly ascribed to the high‐vertically dispersive of nanoneedles and the existing Fe dopants, which obviously improved the reaction kinetics and the intrinsic catalytic properties. The simple preparation strategy is conducive to establish high‐electrochemical‐interface catalysts, which shows great potential in renewable energy conversion.