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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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NaOH溶液中Ni基石墨修饰电极上甲醇电氧化过程中钴与铜的协同效应
DOI: 10.1016/S1872-2067(15)60959-7, PP. 1867-1874
Keywords: 甲醇电氧化,电催化,协同效应,镍,修饰电极
Abstract:
？在NaOH溶液(0.1mol/L)中考察了Ni,Co和Cu二元和三元合金修饰的石墨电极上甲醇电氧化反应性能.采用循环伏安法、计时电流法和电化学阻抗谱(EIS)等技术研究了修饰电极的催化活性和协同效应.这些催化剂在含有Ni,Cu和Co离子溶液的阴极电位上反复浸渍石墨电极制得.结果表明,在甲醇存在下,Ni基三元合金修饰电极(G/NiCuCo)对甲醇氧化反应的响应值明显高于其它样品.阳极峰值电流与扫描速率的平方根呈线性关系,表明该过程受扩散控制.在CA区域,该反应遵循Cottrellin特性,甲醇扩散系数为6.25×10-6cm2/s.甲醇氧化反应速率常数为40×107cm3/(mol·s).另外,采用EIS研究了修饰电极表面上甲醇催化氧化反应.
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