旋转环盘电极法研究亚硒酸的电化学还原机理  

Studies on Electrochemical Reduction Mechanism of H_2SeO_3 by Rotating Ring-Disc Electrode

作　　者：刘东[1] 张瀛洲[1] 周绍民[1] 

机构地区：[1]厦门大学化学系物理化学研究所

出　　处：《厦门大学学报（自然科学版）》1989年第5期495-499,共5页Journal of Xiamen University：Natural Science

基　　金：福建省自然科学基金

摘　　要：用旋转环盘电极研究了亚硒酸在玻碳电极上的阴极行为。在4 mmol/l H_2SeO_3+0.2 mol/l H_2SO_4溶液中,电位比-0.39V稍负,亚硒酸可电化学还原至Se,而当电位比-0.45 V负时,则有H_2Se生成。结果表明,H_2SeO_3电化学还原经历中间历程。电化学还原生成的蓝色硒为电惰性品种,可化学反应生成的红色硒具有电活性。根据电极转速与环、盘电流比值关系导出H_2Se与H_2SeO_1之间的化学反应速度常数为3.2×10~4 l/mol·ε~2。The cathodic behaviour of H2SeO3 was investigated using RRDE. In 4 mmol/l H2SeO3+0.2 mol/l H2SO4, H2SeO3 is reduced to Se at potential little more negative than -0,39 V, but H2Se is produced simultaneously at potential more negative than-0.45 V.Blue elemetal selenium resulted from electrochemical reduction is electrochemical inactive, but red selenium can de reduced to form H2Se. Based on the effects of rotating rate of RRDE on IR/ID, the rate constant of the chemical reaction between H2Se and H2SeO2 was determined to be 3.2×104 l/mol·S2.

关 键 词：亚硒酸 旋转环盘电极 电化学还原 

分 类 号：O613.52[理学—无机化学]