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

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...

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Bibliographic Details
Published in催化学报 Vol. 37; no. 4; pp. 616 - 627
Main Author H. B. Hassana Z. Abdel Hamid Rabab M. El-Sherif
Format Journal Article
LanguageChinese
Published 开罗大学理学院化学系，吉萨，埃及%中央冶金研究开发研究所，开罗，埃及 2016
Subjects
乙醇
循环伏安法
氧化镁
甲醇
电化学阻抗谱
电氧化
镍修饰
电氧化
电化学阻抗谱
乙醇
Ethanol
循环伏安法
Electrooxidation
Cyclic voltammetry
氧化镁
镍修饰
Nickel-modified manganese oxide
甲醇
Methanol
Electrochemical impedance spectroscopy
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ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(15)61034-8|

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Summary: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。
Bibliography: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 electrocata‐lysts 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 spectros‐copy, X‐ray diffractometry, and scanning electron microscopy, respectively. Different electrochemi‐cal techniques were used to estimate the catalytic activity of the prepared electrocatalyst anodes, including cyclic voltammetry （CV）, chronoamperometry, and electrochemical impedance spectros‐copy （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 cata‐lytic activity of the Ni catalyst for the alcohol electrooxida
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(15)61034-8|