酸性介质中Pt电极上α-丙氨酸吸附和氧化的EQCM研究

贵金属, 2003, 24(2): 1-6. doi: 10.3969/j.issn.1004-0676.2003.02.001

酸性介质中Pt电极上α-丙氨酸吸附和氧化的EQCM研究

林进妹 ^1, , 林珩 ^2, , 卢江红 ^3, , 薛珲 ^4, , 林爱兰 ^5, , 陈国良 ^6,

1.漳州师范学院化学系,福建,漳州,363000

2.漳州师范学院化学系,福建,漳州,363000

3.漳州师范学院化学系,福建,漳州,363000

4.漳州师范学院化学系,福建,漳州,363000

5.漳州师范学院化学系,福建,漳州,363000

6.漳州师范学院化学系,福建,漳州,363000

基金项目: 福建省教育厅科研项目(K2001101,JB02040)

关键词：电化学 , 吸附和氧化 , α-丙氨酸 , 电化学石英晶体微天平 , Pt电极

EQCM Study of Adsorption and Oxidation of α - Alanine on Pt Electrode in Acidic Solution

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/LH2SO4溶液中α-丙氨酸在Pt电极上的吸附和氧化过程.从电极表面质量变化的结果分析,可认为0.1mol/LH2SO4溶液中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H2O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,进一步推算出酸性溶液中α-丙氨酸在Pt电极表面只发生弱吸附.H2O和α-丙氨酸阴离子都可以取代氢吸附在电极表面,吸附物种抑制了部分氢的吸附、脱附,并影响电极表面质量的改变量,而吸附态α-丙氨酸在高电位氧化时会消耗Pt表面的氧,本文结果可为认识α-丙氨酸在Pt电极表面过程提供定量的新数据.

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