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首页> 外文期刊>Electrocatalysis >Enhanced Catalytic Performance of Bimetallic Nickel-Cobalt Loaded Low-Content Au Catalyst Toward Ethanol Electro-Oxidation
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Enhanced Catalytic Performance of Bimetallic Nickel-Cobalt Loaded Low-Content Au Catalyst Toward Ethanol Electro-Oxidation

机译：负载双金属镍钴的低含量金催化剂对乙醇电氧化的增强催化性能

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摘要

Low-content Au nanoparticles loaded over nickel-cobalt bimetallic nanoflakes on a FTO substrate electrode (Au/NiCo) were obtained by an electrodeposition-replacement precipitation method. The as-prepared catalysts were characterized by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), and their catalytic performances for ethanol electro-oxidation were investigated by multi-cyclic voltammetry, current-time curve, Tafel curve, and electrochemical impedance spectroscopy (EIS). The result showed that Au/NiCo catalysts exhibited higher electrocatalytic activity toward ethanol electro-oxidation compared to Au nanoparticles loaded on nickel (Au/Ni) and cobalt (Au/Co), respectively, due to the enhanced anti-poisoning tolerance by Co, and the bifunctional effect of NiCo and Au. Moreover, the ratio of Ni and Co had a great effect on the activity of the nanocomposite catalyst; Au/Ni0.04 prepared from the electrolyte of 0.04 mol/L Ni(NO3)(2) + 0.005 mol/L Co(NO3)(2) showed the highest performance for ethanol electro-oxidation. The result from this work suggests a new route for rational design of low-cost and high-performance electrocatalysts in direct ethanol fuel cells.
机译：通过电沉积-置换沉淀法获得了在FTO基板电极（Au / NiCo）上负载在镍钴双金属纳米薄片上的低含量Au纳米颗粒。通过扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）对所制备的催化剂进行了表征，并通过多循环伏安法，电流-时间曲线，Tafel曲线，和电化学阻抗谱（EIS）。结果表明，与负载在镍（Au / Ni）和钴（Au / Co）上的Au纳米颗粒相比，Au / NiCo催化剂对乙醇的电氧化表现出更高的电催化活性，这是由于Co增强了抗中毒能力， NiCo和Au的双功能效应。而且，Ni和Co的比例对纳米复合催化剂的活性有很大的影响。由0.04 mol / L Ni（NO3）（2）+ 0.005 mol / L Co（NO3）（2）的电解质制备的Au / Ni0.04显示出最高的乙醇电氧化性能。这项工作的结果为合理设计直接乙醇燃料电池中的低成本，高性能电催化剂提供了一条新途径。

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