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通过水热-热分解法制备球形介孔氧化镍粉末,并采用X射线衍射、扫描电镜、透射电镜和比表面积仪对氧化镍粉末的形貌和结构进行表征;通过循环伏安法、计时电流法和电化学阻抗谱的测试,系统研究该种粉末在碱性介质中对乙醇的电催化氧化活性.结果表明:所得到的氧化镍粉末为球形,比表面积为35 m2·g-1,平均孔径为15.88 nm;该粉末对乙醇具有良好的催化活性,氧化电流随乙醇浓度和扫描速率的增大而增大,在0.60 V电位下保持1000 s,球形多孔氧化镍对乙醇氧化催化的电流衰减率为0.075%,稳定性比较好.循环伏安法、计时电流法和电化学阻抗谱测试表明,球形介孔Ni O/玻碳电极(Ni O/GCE)对乙醇的催化氧化反应机理为扩散控制.
The spherical mesoporous nickel oxide powders were prepared by hydrothermal-thermal decomposition method. The morphology and structure of the nickel oxide powders were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and surface area analyzer. The cyclic voltammetry, Electrochemical impedance spectroscopy was used to study the electrocatalytic activity of the powder in alkaline medium. The results showed that the obtained nickel oxide powders were spherical with specific surface area of 35 m2 · g-1. The average The pore diameter is 15.88 nm. The powder has good catalytic activity to ethanol. The oxidation current increases with the increase of ethanol concentration and scan rate and keeps at 0.60 V for 1000 s. The current of spherical porous nickel oxide to ethanol oxidation decays The cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy measurements showed that the catalytic oxidation reaction mechanism of the spherical mesoporous Ni O / glassy carbon electrode (Ni O / GCE) to ethanol was diffusion control.