FeNi2S4纳米球的合成及其电催化析氧性能OA

Oxygen Evolution Reaction(OER)is a core half-reaction in energy conversion devices such as water electrolysis.The development of efficient and stable non-noble metal OER catalysts are vital importance.Layered Dihydroxides(LDH)are excellent precursors for the preparation of transition metal-based catalysts.In this paper,FeNi2-LDH was used as the precursor to synthesize FeNi2S4 nanoball catalysts by a simple hydrothermal vulcanization method,and its OER electrocatalytic per-formance was systematically studied.The morphology and surface electronic states of the catalyst were characterized by Scanning Electron Microscopy(SEM),X-ray Photoelectron Spectroscopy(XPS),and other techniques.The electrochemical test results show that the FeNi2S4 nanoball exhibit excellent OER activity in 1 mol/L KOH electrolyte.At a current density of 10 mA/cm2,the overpo-tential is only 275 mV,and the Tafel slope is as low as 79.03 mV/dec,which is superior to the FeNi2-LDH precursor.Furthermore,after continuous electrolysis for 10 hours,this catalyst still exhibits excellent stability.The unique nanosphere structure has a large electrochemical active area,which ex-poses abundant active sites and accelerates the charge transfer and the adsorption-desorption kinetics of reaction intermediates.