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0.1mol·L–1 H2SO4溶液中1,2-丙二醇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1,2-丙二醇的电氧化。从电极表面质量定量变化的角度,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 1,2-Propanediol on Pt/Sad electrode were studied by cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The results demonstrated that the Sad atom is stable on Pt electrode when the electrode potentials are below 0.70V(SCE). 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 of Pt electrode surface. As a consequence, the oxidation of 1, 2-Propanediol was inhibited by the presence of Sad. The EQCM studies provided quantitative results of surface mass variation during 1,2-Propanediol oxidation, and have thrown new light in elucidating effects of ad atom Sad on Pt electrode surface towards 1,2-Propanediol oxidation.
出处
《莆田学院学报》
2003年第3期42-45,共4页
Journal of putian University
基金
福建省自然科学基金计划资助项目(E0310026)
漳州师范学院科研基金重点资助项目
