Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (23): 2137-2140. Previous Articles     Next Articles

碱性介质中甲醇在铂电极表面吸附和氧化的电化学原位FTIR反射光谱和EQCM研究

林珩1, 陈国良1,2, 郑子山1, 周建章2, 陈声培2, 林仲华2   

  1. 1. 漳州师范学院化学系, 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, 厦门, 361005
  • 投稿日期:2005-03-02 修回日期:2005-08-12 发布日期:2014-02-14
  • 通讯作者: 林珩,E-mail:cheng1259@263.net E-mail:cheng1259@263.net
  • 基金资助:

    国家自然科学基金(No.20433040);福建省自然科学基金(No.E0310026);福建省教委科研基金资助项目.

EQCM and in-situ Reflectance FTIR Spectroscopic Studies of Adsorption and Oxidation of Methanol on Pt Electrode in Alkaline Media

LIN Heng1, CHEN Guo-Liang1,2, ZHENG Zi-Shan1, ZHOU Jian-Zhang2, CHEN Sheng-Pei2, LIN Zhong-Hua2   

  1. 1. Department of Chemistry, Zhangzhou Normal College, Zhangzhou 363000;
    2. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:2005-03-02 Revised:2005-08-12 Published:2014-02-14

The adsorption and oxidation of methanol on Pt electrode in alkaline media have been investi-gated by using cyclic voltammetry, electrochemical quartz crystal microbalance (EQCM) and in-situ reflec-tance FTIR spectroscopy. The experimental results demonstrated that the electrooxidation of CH3OH was closely relative to solution acidity. Only one current peak of methanol oxidation in PGPS was detected at -0.09 V, which illustrated the disappearance of the second current peak due to Pt electrode passivation in alkaline media. The magnitude of the dissociative adsorbate of methanol in alkaline media is smaller than that in acidic media. The main product, such as CO2 and CO32-, was detected clearly and the reactive in-termediates that were determined by FTIRs under experimental condition might be mainly HCOO- species. The EQCM studies provide quantitative results of surface mass changes during methanol oxidation, and have thrown new light in the elucidating methanol oxidation.

Key words: Pt electrode, methanol, alkaline media, in-situ reflectance FTIR, EQCM, electrooxidation