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本文详细地研究了玻炭电极(GCE)表面上Au、Pb催化剂颗粒大小和分布形貌及其对Cr~(3+)/Cr~(3+)氧化还原反应催化性能的影响。扫描电镜观察结果表明,Au、Pb在GCE上呈现出不同的表面形貌。Au为颗粒状,Pb为较大面积的聚积状。它们的颗粒大小频率分布直方图由计算机与数字化仪联用计算测得。根据数理统计原理,用正态分布及Γ分布函数分别对所得实验分布进行计算拟合。拟合结果说明,Pb的颗粒大小服从正态分布,颗粒较大且分布最均匀。Au颗粒大小分布随电解液中Au~(3+)浓度的不同而不同。[Au~(3+)]=0.05mM时,Au颗粒大小服从Γ分布,颗粒最小且分布最不均匀。但催化剂性能最好。
In this paper, the size and distribution of Au, Pb catalysts on the surface of glassy carbon electrode (GCE) were investigated in detail and their effects on the catalytic performance of Cr 3+ / Cr 3+ redox reactions were studied. Scanning electron microscopy observations showed that Au and Pb showed different surface morphologies on GCE. Au is granular, Pb is a large area of accumulation. The histogram of their particle size and frequency distribution is calculated by computer and digitizer. According to the principles of mathematical statistics, the distributions of the experimental results are respectively calculated and fitted by normal distribution and Γ distribution function. The fitting results show that the particle size of Pb obeys the normal distribution, the particle size is larger and the distribution is the most uniform. The size distribution of Au particles varies with the concentration of Au 3+ in the electrolyte. When [Au ~ (3 +)] = 0.05mM, the size of Au particles follows the Γ distribution with the smallest particles and the most non-uniform distribution. But the best catalyst performance.