微电极研究 III: Hg^2^+的电沉积过程的研究

研究了不同浓度的Hg^2^+在碳纤维微电极电沉积Hg的形态, 沉积机制和实验参数对汞膜性质及溶出电流的影响; 剖析了Hg的成核过程, 验证了成核理论; 借扫描电镜观察了汞晶体图象。约在6×10^-^5mol·L^-^1Hg^2^+时镀汞, 可形成密布型微汞滴构成的类汞膜, 微滴直径在0.03-0.2μm, 汞微滴密度约为5.7×10^6个/cm^2, 提出了优化汞膜的实验条件和依据。

Investigation on microelectrodes III. The study of the electrodeposition processes of Hg^2^+ on carbon fiber microelectrode

The morphol. structure of electrodeposited Hg on the surface of carbon fiber microelectrode in different Hg2+ concns., the mechanism of electrodeposition and the influence of experimental parameters on the features of mercury film are studied. The processes of nucleation and growth, as well as the d. of nuclei are discussed. By means of scanning electron microscope, mercury crystal pattern is observed In the concentration of 6 ?10-5 mol.L-1 Hg2+, the quasi-Hg-film composed of microdroplets in the type of d. distribution with the radius of about 0.03-0.2 mm can be formed. The d. of microdroplet is about 5.7 ?106 particles/cm2. The other experimental conditions are recommended.