球形氧化镍粉末对乙醇的电催化性能的研究

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NiO/玻碳电极( NiO/GCE)对乙醇的催化氧化反应机理为扩散控制.

Electrocatalytic performance of spherical NiO for ethanol oxidation

Spherical mesoporous NiO powders were synthesized by a hydrothermal- thermal decomposition method, and their morphology and structure were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N2 adsorption/desorption analysis. The electrocatalytic performance of NiO powders were systematically studied by cyclic voltammetry ( CV) , chronoamperometry ( CA) and electrochemical impedance spectroscopy ( EIS) . It is found that the prepared mesoporous NiO powders are in spherical morphology with a specific surface area of 35 m2·g-1 and an average pore size of 15. 88 nm. They show good electrocatalytic activity for ethanol oxidation;the oxidation current increases with increasing ethanol concentration and scan rate. The current decay at 0. 60 V for 1000 s is as low as 0. 075%, indicating good stability. CV, CA and EIS measurements show that ethanol oxidation reaction on the spherical mesoporous NiO is a diffusion-controlled process.