Ni/NiCo_2O_4电极的制备及其析氧反应性能  

Preparation and Oxygen Evolution Reaction Performance of Ni/NiCo_2O_4 Electrode

作　　者：王森林[1] 王丽品[1] 张振洪[1] 

机构地区：[1]华侨大学材料科学与工程学院应用化学系,福建厦门361021

出　　处：《物理化学学报》2013年第5期981-988,共8页Acta Physico-Chimica Sinica

摘　　要：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5mol·L-1KOH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162.15kJ·mol-1.Spinel-type NiCo204 powders were prepared by a sol-gel method, and Ni/NiCo204 electrode was prepared through composite sol method combined with sintering. The composition and structure of Nil NiCo204 were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, and energy- dispersive X-ray spectroscopy （EDS）. Electrocatalytic properties of the Ni/NiCo204 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/NiCo204 electrode exhibited a lower OER over- potential, higher specific surface area, and better stability than a porous Ni electrode. The specific surface area of the Ni/NiCo204 electrode was 28.69 times greater than that of the porous Ni electrode, and its apparent activation energies decrease 166.78 and 162.15 k J·mol^-1 at different overpotentials, respectively.

关 键 词：溶胶-凝胶 NiCo2O4 多孔镍 析氧反应 电催化 

分 类 号：O646.54[理学—物理化学]