氧化铁镍电极上析氧反应的电化学研究(英文)

Electrochemical Studies of Iron-doped Nickel Oxide Electrode for Oxygen Evolution Reaction

应用射频反应磁控溅射法制备阳极催化氧化铁镍薄膜,由循环伏安、线性扫描伏安、极化曲线和电化学交流阻抗谱等研究发生在该电极上的氧化反应.结果表明,作为活化中心的铁能使过电势降低,并且随着溅射过程氧流量的增加催化性能增强,铁的掺入使得速率限定步骤由OH-的释放变为氧原子的结合.与镍相比,氧化铁镍是更理想的催化阳极材料,当电流密度为50 mA/cm2时,其氧的过电势比镍的下降了500 mV.

In this paper, the iron-doped nickel oxide thin film as anode catalyst was prepared by RF reactive sputtering method. The oxygen evolution reaction （OER） on the iron-doped nickel oxide was investigated with cyclic voltammetry, liner sweep voltammetry, polarization curves and electrochemical impedance spectroscopy.Results show that the iron acts as active site in the film which makes the overpotential lower, and changes the rate-limiting from primary discharge of OH^- ions to the recombination of oxygen atom. With the increasing of oxygen content in flu ratio during sputtering, the electrocatalytic activities of the film increase. Iron-doped nickel oxide thin film is promising material as OER electrocatalyst for hydrogen production than the nickel electrode.The oxygen overpotential on the film was over 500 mV lower than the overpotential with nickel at 50mA/cm^2.