摘要
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。
Particle size and its distribution morphology of Au, Pb catalysts and the effect on their catalytic behavior for Cr3+/Cr2+ redox reaction on glassy carbon electrode ( GCE ) were studied in detail. The SEM results indicated that Au and Pb exhibit different surface morphology. Experimental histograms of particle size distribution were measured by the combination of computer and digitizer. According to the principle of mathematical statistics, experimetal distributions of Au and Pb particle sizes were fitted with theoretical distribution fuctions. It was found that Pb particle size obeys normal distribution, and the particle size distributions of Au change with the Au3+ concentrations in electrolyte.When [Au3+] = 0.05 mM, particle sizes of Au obey Gamma distribution and the catalyst shows better catalytic activity.
出处
《分子催化》
EI
CAS
CSCD
1990年第1期21-27,共7页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金
