Ni/NiCo2O4电极的制备及其析氧反应性能

采用溶胶-凝胶法制备NiCo₂O₄尖晶石粉体, 然后以多孔Ni 为基体, 通过复合溶胶涂覆结合烧结制备Ni/NiCo₂O₄ 涂层电极. 运用扫描电子显微镜(SEM)、能量色散谱(EDS)和X 射线衍射(XRD)表征粉体以及Ni/NiCo₂O₄涂层电极的组成和结构. 采用循环伏安(CV), 稳态极化(LSV), 电化学阻抗谱(EIS), 恒电位阶跃以及恒电位长时间电解研究涂层电极在5 mol·L^-1 KOH溶液中的电催化析氧反应(OER). 结果表明: Ni/NiCo₂O₄涂层电极与多孔Ni 电极对比, 具有低的析氧过电位、高的比表面积和高的稳定性能; 其中比表面积增大了28.69倍,表观活化能在不同过电位分别降低了166.78和162.15 kJ·mol^-1.

Preparation and Oxygen Evolution Reaction Performance of Ni/NiCo2O4 Electrode

Spinel-type NiCo₂O₄ powders were prepared by a sol-gel method, and Ni/NiCo₂O₄ electrode was prepared through composite sol method combined with sintering. The composition and structure of Ni/ NiCo₂O₄ were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energydispersive X-ray spectroscopy (EDS). Electrocatalytic properties of the Ni/NiCo₂O₄ electrode in the oxygen evolution reaction (OER) were studied in 5 mol·L^-1 KOH solution, using cyclic voltammertry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), chronoamperometry, and extended duration constant potential electrolysis. The Ni/NiCo₂O₄ electrode exhibited a lower OER overpotential, higher specific surface area, and better stability than a porous Ni electrode. The specific surface area of the Ni/NiCo₂O₄ electrode was 28.69 times greater than that of the porous Ni electrode, and its apparent activation energies decrease 166.78 and 162.15 kJ·mol^-1 at different overpotentials, respectively.