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在细小MgO增强颗粒的存在下,采用电沉积法在碳阳极上经瓦特镍制得Ni–MgO纳米复合物,考察了它在碱性介质中电催化氧化甲醇和乙醇反应性能,并与碳涂覆的纯Ni催化剂(Ni/C)性能进行了比较.运用能量散射谱、X射线衍射和扫描电镜分别表征了沉积的纳米复合物的化学组成、相结构和表面形貌,并采用循环伏安法(CV)、计时电流法和电化学阻抗谱(EIS)等电化学技术考察了所制电催化剂阳极的催化活性.结果表明,Ni/C催化剂在电氧化反应中表现出很低的催化活性和稳定性,而MgO的引入显著增加了Ni催化剂在醇氧化反应中的催化活性和抗中毒性能.EIS和CV结果证实Ni–MgO/C纳米复合物电极具有比Ni/C更低的电荷转移阻力和更高的抗中毒性能.
In the presence of small MgO particles, Ni-MgO nanocomposites were prepared by electrochemical deposition of watite on the carbon anode in the presence of fine MgO particles. The catalytic performance of electrocatalytic oxidation of methanol and ethanol in alkaline medium was investigated. The pure Ni catalysts (Ni / C) were characterized by energy dispersive spectroscopy, X-ray diffraction and scanning electron microscopy.The chemical composition, phase structure and surface morphology of the deposited nanocomposites were characterized respectively by cyclic voltammetry (CV), chronoamperometry and electrochemical impedance spectroscopy (EIS) were used to investigate the catalytic activity of the prepared electrocatalyst anode.The results showed that the Ni / C catalyst showed low catalytic activity in electrooxidation And stability, and the introduction of MgO significantly increased the catalytic activity and anti-poisoning performance of the Ni catalyst in the alcohol oxidation reaction.EIS and CV results confirmed that the Ni-MgO / C nanocomposite electrode has a lower charge transfer than Ni / C Resistance and higher resistance to poisoning.