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用电化学石英晶体微天平 (EQCM)研究酸性和碱性介质中甘氨酸在 Pt电极上的吸附和氧化过程 .结果表明 ,甘氨酸的解离吸附和氧化行为与溶液的酸碱性密切相关 .酸性溶液中甘氨酸吸附较弱 ,碱性溶液中则产生强吸附物 ,且当电位低于 0 V(vs.SCE)时可吸附于 Pt电极表面 .此外 ,碱性溶液中甘氨酸还表现出较高的电氧化活性 .通过 EQCM定量检测上述过程中 Pt电极表面的质量变化 ,测定了不同电位区间 (氢区、双电层区和氧区 )每传递一个电子所对应的电极表面吸附物种的平均摩尔质量
The electrochemical quartz crystal microbalance (EQCM) was used to study the adsorption and oxidation of glycine on the Pt electrode in acidic and alkaline media. The results showed that the dissociative adsorption and oxidation of glycine were closely related to the acidity and basicity of the solution. Glycine is weakly adsorbed, strong adsorbate is produced in alkaline solution, and adsorbed on Pt electrode surface when potential is lower than 0 V. In addition, glycine in alkaline solution also shows higher electricity Oxidation activity The mass change of the surface of Pt electrode in the above process was quantitatively detected by EQCM and the average molar mass of adsorbed species on the electrode surface corresponding to each electron transfer in different potential regions (hydrogen region, electric double layer region and oxygen region) was measured