铁镍双金属氧化物纳米材料的电沉积及电催化性能研究

Electrodeposition and electrocatalytic performance of NiFe2O4 nanomaterial

采用循环伏安电沉积技术在泡沫镍(NF)基底上合成了铁镍双金属氧化物纳米材料(NiFe2O4),进而制备了NiFe2O4/NF电极。使用场发射扫描电镜(FE-SEM)、X射线衍射仪(XRD)对合成材料进行了结构形貌表征。采用极化曲线、恒电流电解等电化学技术研究了NiFe2O4/NF电极在碱性溶液中对电解水析氧反应(OER)的催化性能。结果表明:NiFe2O4/NF对OER反应具有良好的催化活性和稳定性,电流密度为10mA/cm2时的过电位仅为280mV,塔菲尔斜率为72.2mV/dec,恒电流电解2h后电位变化较小。和目前商用IrO2电催化剂相比,大电流电解条件下的反应过电位降低。

Fe,Ni bimetallic oxide nanomaterials(NiFe2O4)were successfully deposited on nickel foam substrate by cyclic voltammetric electrodeposition,and then prepared NiFe2O4/NF electrode.The morphology and structure of the nanomaterials were characterized by FE-SEM and XRD.Meanwhile,the electrocatalytic performances of the prepared NiFe2O4/NF electrode for oxygen evolution reaction(OER)in alkaline solution was tested by polarization curves and constant current electrolysis.The results indicated that the NiFe2O4/NF electrode exhibited excellent electrocatalytic performances for OER.The overpotential was 280 mV for OER at the current density of 10 mA/cm2 and the Tafel slope was 72.2 mV/dec.Moreover,the overpotential changed slightly after constant current electrolysis for 2 hours.Compared with the current commercial IrO2 electrocatalyst,the overpotential of OER was reduced at high current density.