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Citation: FAN You-Jun, ZHEN Chun-Hua, CHEN Sheng-Pei, SUN Shi-Gang. Effect of Specific Adsorption of Anions and Surface Structure of Pt(111) Electrode on Kinetics of Dissociative Adsorption of Ethylene Glycol[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 999-1003. doi: 10.3866/PKU.WHXB20090415 shu

Effect of Specific Adsorption of Anions and Surface Structure of Pt(111) Electrode on Kinetics of Dissociative Adsorption of Ethylene Glycol

1.
College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, Guangxi Province, P. R. China; State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 17 November 2008
Available Online: 18 February 2009

The effect of specific adsorption of anions and the surface structure of a Pt(111) electrode on the kinetics of dissociative adsorption of ethylene glycol (EG) was studied using cyclic voltammetry and a programmed potential step technique. Quantitative results demonstrated that the specific adsorption of anions remarkably influenced the dissociative adsorption of EG. Both the initial reaction rate (vi) of the EG dissociative adsorption and the saturated coverage of dissociative adsorbates, measured in perchloric acid media (without specific adsorption), are significantly larger than the corresponding values acquired in sulfuric acid media (with specific adsorption of SO2-40/HSO-4). We illustrate that the variation of the average reaction rate v of EGdissociative adsorption on Pt(111) in perchloric acid media with an electrode potential yields a volcano-like distribution with a maximumvalue near 0.22 V (vs SCE). Furthermore, different surface structures of the Pt(111) electrode that were obtained by different treatments also significantly affect this surface process.
- Ethylene glycol,
- Dissociative adsorption,
- Pt(111) electrode,
- Specific adsorption,
- Surface structure,
- Surface reaction kinetics
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