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首页> 外文期刊>International Journal of Electrochemical Science >Electrocatalytic Oxidation of Methanol on NiMnsalpnY Modified Glassy Carbon Electrode
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Electrocatalytic Oxidation of Methanol on NiMnsalpnY Modified Glassy Carbon Electrode

机译：NiMnsalpnY修饰的玻碳电极上甲醇的电催化氧化

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Zeolite composite catalyst NiMnsalpnY prepared by the flexible ligand method is examined for its redoxprocess and electrocatalytic activities towards the oxidation of methanol. The methods of cyclicvoltammetry (CV), chronoamperometry (CA), chronocoulometry (CC) and electrochemical impedancespectroscopy (EIS) are employed. The NiMnsalpnY composite system presents the characteristic ofquasi-reversibility, which can be anticipated for the Ni(Ⅲ)/Ni(Ⅱ) couple. In the presence of methanol,the NiMnsalpnY modified electrode, compared with other modified electrodes, reveals a significantlyhigher response for the electrooxidation of methanol. The addition of a small amount of alloying elementMn to pure Ni can greatly enhance the ability of methanol electrooxidation. The anodic peak currentscorresponding to methanol oxidation exhibit a linear dependency on the square root of the scan rate,indicating a diffusion controlled process. The electrocatalytic peak currents are proportional to theconcentration of methanol, suggesting that the electrocatalytic oxidation of methanol at NiMnsalpnY/GCelectrode seems to be certain. The mechanism of electrocatalytic methanol oxidation based on theelectrochemical cyclic regeneration of Ni(Ⅲ)Mn(Ⅲ) active sites and their redox reaction with methanolin subsequent process is discussed. The kinetic parameters such as the electron transfer coefficient α (thevalue is 0.34) of the electrode reaction, the diffusion coefficient D (the value is 1.28×10 -8 cm 2 ?s -1 ) ofmethanol and the catalytic rate constant k cat (the value is 1.55×10 4 cm 3 ?mol -1 ?s -1 for the concentration of0.5M methanol) have been derived. The resistance of the electrocatalytic oxidation system has beeninvestigated through the EIS regime.
机译：研究了通过柔性配体法制备的沸石复合催化剂NiMnsalpnY的氧化还原过程和对甲醇氧化的电催化活性。采用循环伏安法（CV），计时电流法（CA），计时电量法（CC）和电化学阻抗谱法（EIS）。 NiMnsalpnY复合体系具有准可逆性，对于Ni（Ⅲ）/ Ni（Ⅱ）偶对是可以预期的。与其他修饰电极相比，在存在甲醇的情况下，NiMnsalpnY修饰电极显示出对甲醇电氧化的明显更高的响应。在纯Ni中添加少量合金元素Mn可大大增强甲醇电氧化的能力。对应于甲醇氧化的阳极峰值电流对扫描速率的平方根表现出线性依赖性，表明扩散受控的过程。电催化峰值电流与甲醇浓度成正比，表明甲醇在NiMnsalpnY / GC电极上的电催化氧化似乎是确定的。讨论了基于Ni（Ⅲ）Mn（Ⅲ）活性位的电化学循环再生及其后续与甲醇的氧化还原反应的电催化甲醇氧化机理。动力学参数包括电极反应的电子转移系数α（值为0.34），甲醇的扩散系数D（值为1.28×10 -8 cm 2？s -1）和催化速率常数k cat（对于0.5M甲醇的浓度，已经推导出其值为1.55×10 4 cm 3？mol -1？s -1。电催化氧化系统的电阻已通过EIS制度进行了调查。

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