硫酸溶液中Pt电极表面过程的EQCM研究  

An EQCM Study of Water Adsorption and Oxidation on Pt Electrodes in Sulfate Acid Sulotions

作　　者：林珩[1] 陈声培[2] 林进妹[1] 林爱兰[1] 陈国良[1] 

机构地区：[1]漳州师范学院化学系,福建漳州363000 [2]厦门大学化学系固体表面物理化学国家重点实验室,福建厦门361005

出　　处：《电化学》2003年第1期47-53,共7页Journal of Electrochemistry

基　　金：国家自然科学基金(29833060);福建省教委科研基金(K2001101)项目资助

摘　　要：　应用电化学循环伏安和石英晶体微天平(EQCM)方法研究了0.1mol·L-1硫酸溶液中Pt电极表面的吸附和氧化过程.从电极表面质量变化的结果分析,可认为正向电位扫描时氢区表面质量的增加是由于水分子取代Had引起的,而双电层区的质量增加则是由于水的吸附模式逐渐由氢端吸附转向氧端吸附所致.根据频率变化和电量数据,进一步推算出水在双电层区是以低放电吸附形式出现的,1molPt原子和水分子只发生0.054mol的电荷转移.本文结果可为认识Pt电极表面过程提供定量的新数据.Simultaneous frequency and current responses during potential cycling of Pt electrode were measured in 0.1 mol·L-1 H2SO4 solution by using EQCM.Quantitative analysis of the mass change revealed that the increase of mass in the hydrogen and double_layer regions in a positive_going potential scan was due to water adsorption on the Pt electrode,further calculation indicated that water molecules adsorbed on Pt electrode in the double_layer regions through a low discharge quomodo .The EQCM studies provided quantitative results of surface mass variation during water adsorption and oxidation,and have thrown new light in elucidating the structure of double_layer between electrode and solution.

关 键 词：硫酸溶液 PT电极 EQCM 电化学石英晶体微天平 水 表面过程 铂电极 电化学 硫酸溶液 

分 类 号：O646.54[理学—物理化学]