Pt电极上S吸附原子对甲酸电催化氧化性能的影响  

Influences of S-Adsorbed Pt Electrode on the Electrocatalytic Oxidation of Formic acid

作　　者：卢江红[1] 林进妹[1] 林爱兰[1] 李鲤燕[1] 黄如莺[1] 

机构地区：[1]漳州师范学院化学系,福建漳州363000

出　　处：《漳州师范学院学报（自然科学版）》2003年第2期68-72,共5页Journal of ZhangZhou Teachers College（Natural Science)

基　　金：福建省科技三项费用项目(K2001101);漳州师范学院科研基金重点资助项目

摘　　要：运用电化学循环伏安(CV)和电化学原位石英晶体微天平(EQCM)研究了Pt电极表面不可逆吸附S原子的电化学特性以及Pt电极上S吸附原子对0.1 mol?L 1 H2SO4溶液中甲酸电催化氧化性能的影响. 研究发现, 当扫描电位的上限Eu≤0.70V(SCE)时, Sad可以稳定地吸附在Pt电极表面; 通过控制电位扫描上限和扫描圈数剥离部份S 可方便地得到Sad的不同覆盖度; Pt电极表面S吸附原子的氧化会消耗表面氧物种, 抑制了甲酸的电氧化. 本文从表面质量变化提供了吸附原子电催化作用的新数据.The electrochemical behaviors of irreversibly adsorbed Sad on Pt electrode and the processes of adsorption and oxidation of formic acid on Pt/Sad electrodes were investigated by cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The results showed that the Sad atoms were stable on Pt electrode below 0.70V(SCE) of the electrode potentials. It has demonstrated that various coverages of Sad can be easily obtained by stripping partially Sad starting from a saturation adsorbed Pt/ Sad surface. The oxidation of Sad atom consumes oxygen species on Pt electrode surface. As a consequence, the oxidation of formic acid was inhibited by the presence of Sad. By EQCM we can get quantitative results of surface mass variation during formic acid oxidation. EQCM throws new light in elucidating effects of adsorbed atom Sad on Pt electrode surface on formic acid oxidation.

关 键 词：甲酸 电催化氧化 PT电极 不可逆吸附 硫原子 电化学循环伏安法 EQCM 

分 类 号：O623.611[理学—有机化学] O646.54[理学—化学]