阴离子Cl^- NO_3^- ClO_4^-对Pb^(2+)/AgUPD体系行为的影响研究  

The investigations of the effect of anion Cl^-,ClO_4^- and NO_3^- on the behavior of Pb^(2+)/Ag UPD system

作　　者：王春明[1] 杜永令[1] 佟浩[1] 

机构地区：[1]兰州大学化学化工学院,甘肃兰州730000

出　　处：《兰州大学学报（自然科学版）》2002年第3期54-57,共4页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金资助项目 (2 0 0 730 17)

摘　　要：研究了 Pb2 + / Ag欠电位沉积 (UPD)体系在不同阴离子 (Cl-,NO-3 ,Cl O-4)存在下的行为 .发现 Pb2 + UPD峰电位随溶液中 Cl-离子浓度增加负向移动 ,而随溶液中 Pb2 +离子浓度增加正向移动 ;NO-3 在银电极上不但有吸附而且有反应 ,但其吸附竞争力较 Cl-而言明显较弱 ;Cl-的诱导吸附有利于取得稳态条件下 UPD Pb的最大表面覆盖度 ;Cl O-4则未发现有明显的吸附行为 .The effect of anions such as Cl -,ClO - 4 and NO - 3 on UPD Pb 2+ /Ag system was investigated with cyclic voltammetry,linear scan voltammetry and chronocoulemetry.It's found that the peak potential of Pb 2+ UPD on silver electrode shifted negatively with increasing Cl - concentration and positively with increasing Pb 2+ concentration.NO - 3 also possesses strongly adsorptive behavior on silver electrode and shows electrode reaction.However,the adsorptive competition of NO - 3 is obviously weaker than that of Cl -.The induced absorption of Cl - is an advantage to the monolayer formation of UPD Pb 2+ .There is no adsorption of ClO - 4 to be found.

关 键 词：阴离子 Cl^- NO3^- ClO4^- 欠电位沉积 铅 银电极 Pb^2+/AgUPD体系 吸附行为 氯离子 硝酸根离子 氯酸根离子 

分 类 号：O646.54[理学—物理化学]