用于大电流密度电解水析氧的NiF-NiSe/NF催化电极的制备与性能研究

Preparation and Performance of NiFe-NiS/NF Catalytic Electrode for Oxygen Evolution by Water Electrolysis at High Current Density

以原位硫化腐蚀泡沫镍表面得到的NiS/NF为前驱体,通过电沉积NiFe纳米颗粒对其表面进行修饰,制备了NiFe-NiS/NF催化电极,采用SEM、EDS、XRD等对其进行了表征,并对其电化学性能进行了评价。结果表明,在1 mol·L^(-1) KOH电解液中,NiFe-NiS/NF催化电极在电流密度为10 mA·cm^(-2)、1 000 mA·cm^(-2)时的过电位分别为203 mV、350 mV;NiFe-NiS/NF催化电极具有优异的析氧反应(OER)性能,归因于其快的动力学反应速率、小的电荷转移电阻(R_(ct))和大的电化学活性面积的协同作用,此外,NiS薄膜在泡沫镍上的沉积显著增加了NiFe-NiS/NF催化电极的催化活性位点;NiFe-NiS/NF催化电极在10 mA·cm^(-2)的电流密度下测试24 h表现出良好的催化稳定性。

Using NiS/NF obtained from in situ vulcanization corrosion of the surface of nickel foam as a precursor,we prepared NiFe-NiS/NF catalytic electrode by electrodeposition of NiFe nanoparticles.Moreover,we characterized the NiFe-NiS/NF catalytic electrode by SEM,EDS,and XRD,and evaluated its electrochemical performance.The results show that the overpotential of NiFe-NiS/NF catalytic electrode in 1 mol·L^(-1) KOH electrolyte is 203 mV and 350 mV at 10 mA·cm^(-2) and 1 000 mA·cm^(-2),respectively.NiFe-NiS/NF catalytic electrode has excellent properties of oxygen evolution reaction(OER),due to the synergistic effect of its fast kinetical reaction,small charge transfer resistance(R_(ct)),and large electrochemical active area.In addition,the deposition of NiS film on nickel foam significantly increases the catalytic active sites of NiFe-NiS/NF catalytic electrode.The NiFe-NiS/NF catalytic electrode shows good catalytic stability when tested at a current density of 10 mA·cm^(-2) for 24 h.