碳电极上电沉积的Ni-MgO纳米复合物催化甲醇和乙醇电氧化反应

doi:10.1016/S1872-2067(15)61034-8

摘要/Abstract

摘要：

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.

关键词: 镍修饰, 氧化镁, 电氧化, 甲醇, 乙醇, 电化学阻抗谱, 循环伏安法

Abstract:

Ni-MgO nano-composites were prepared on carbon anodes by electrodeposition from a nickel Watts bath in the presence of fine MgO reinforcement particles. Their performance as electrocatalysts for the oxidation of methanol and ethanol in alkaline medium was investigated and compared with that of carbon coated pure Ni (Ni/C). The chemical composition, phase structure, and surface morphology of the deposited nano-composites were studied by energy dispersive X-ray spectroscopy, X-ray diffractometry, and scanning electron microscopy, respectively. Different electrochemical techniques were used to estimate the catalytic activity of the prepared electrocatalyst anodes, including cyclic voltammetry (CV), chronoamperometry, and electrochemical impedance spectroscopy (EIS). The Ni/C electrocatalyst alone exhibited remarkably low catalytic activity and poor stability toward the electrooxidation process. The inclusion of MgO significantly promoted the catalytic activity of the Ni catalyst for the alcohol electrooxidation and enhanced its poisoning resistance. The EIS results confirmed those of CV and revealed a lower charge transfer resistance and enhanced roughness for the Ni-MgO/C nano-composite electrodes compared with those of Ni/C.

Key words: Nickel-modified manganese oxide, Electrooxidation, Methanol, Ethanol, Electrochemical impedance spectroscopy, Cyclic voltammetry

H. B. Hassana, Z. Abdel Hamid, Rabab M. El-Sherif. 碳电极上电沉积的Ni-MgO纳米复合物催化甲醇和乙醇电氧化反应[J]. 催化学报, 2016, 37(4): 616-627.

H. B. Hassan, Z. Abdel Hamid, Rabab M. El-Sherif. Electrooxidation of methanol and ethanol on carbon electrodeposited Ni-MgO nanocomposite[J]. Chinese Journal of Catalysis, 2016, 37(4): 616-627.

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