自支撑NiMoP@NiFeP异质结电极的制备及其电催化析氧性能研究

Preparation of self-supported NiMoP@NiFeP heterojunction and electrocatalytic oxygen evolution performance

析氧反应(OER)是水分解一个重要的半反应,开发高效稳定的非贵金属基电催化剂用于大规模产氢仍面临巨大挑战。采用水热和低温磷化的方法在泡沫镍(NF)上原位构筑了NiMoP@NiFeP/NF复合电极。利用扫描电子显微镜(SEM),X射线光电子能谱(XPS)等对所制备电极的微观形貌和组成电极元素的价态进行表征。此外,通过电化学测试表明,NiMoP@NiFeP/NF电催化剂在1 mol/L KOH电解液中驱动100 mA/cm^(2)的电流密度仅需246 mV的过电势,塔菲尔斜率为54.6 mV/dec,且至少能保持20 h的稳定性。为制备非贵金属基的催化剂,用于能源的存储和转换提供了一种有效途径。

Oxygen evolution reaction(OER)is an important semi-reaction of water cracking.The development of efficient and stable non-noble metal-based electrocatalysts for large-scale hydrogen production is still a great challenge.In this paper,NiMoP@NiFeP/NF composite electrode was constructed on nickel foam(NF)by hydrothermal and low temperature phosphating methods.Scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS)were used to characterize the microstructure of the electrode and the valence states of the elements.In addition,electrochemical tests show that NiMoP@NiFeP/NF electrocatalyst can drive a current density of 100 mA/cm^(2) in 1 mol/L KOH electrolyte with only 246 mV overpotential and Tafel slope of 54.6 mV/dec,and can maintain stability for at least 20 h.This work provides an effective way to prepare non-noble metal-based catalysts for energy storage and conversion.