中性介质中L-丝氨酸在Pt电极上解离吸附和氧化的原位FTIR研究

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (10): 2040.

中性介质中L-丝氨酸在Pt电极上解离吸附和氧化的原位FTIR研究

孔德文, 朱天玮, 曾冬梅, 甄春花, 陈声培, 孙世刚

厦门大学固体表面物理化学国家重点实验室, 化学化工学院化学系, 厦门 361005

收稿日期:2008-11-19 出版日期:2009-10-10 发布日期:2009-10-10
通讯作者: 孙世刚, 男, 博士, 教授, 博士生导师, 主要从事表面化学与电催化等研究. E-mail: sgsun@xmu.edu.cn
基金资助:
国家自然科学基金(批准号: 20673091, 20833005)资助.

in situ FTIR Spectroscopic Studies of Adsorption and Oxidation of L-Serine on Pt Electrodes in Neutral Solutions

KONG De-Wen, ZHU Tian-Wei, ZENG Dong-Mei, ZHEN Chun-Hua, CHEN Sheng-Pei, SUN Shi-Gang*

State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

Received:2008-11-19 Online:2009-10-10 Published:2009-10-10
Contact: SUN Shi-Gang. E-mail: sgsun@xmu.edu.cn
Supported by:
国家自然科学基金(批准号: 20673091, 20833005)资助.

摘要/Abstract

摘要：

运用电化学循环伏安(CV)和原位红外反射光谱(in situ FTIRS)研究了中性介质中L-丝氨酸在Pt电极上的解离吸附和氧化过程. 结果表明, 在中性溶液中, 以两性离子形式存在的丝氨酸可以在很低的电位下(-0.6 V, vs. SCE)在Pt电极表面发生解离吸附, 生成强吸物种一氧化碳(CO_L)、(CO_B)和氰负离子(CN^-). 研究结果还表明, 当电位低于0.7 V(vs. SCE)时, CN^-能稳定存在于电极表面, 抑制丝氨酸的进一步反应. 在更高电位时则主要为丝氨酸分子的氧化过程.

关键词: L-丝氨酸; 中性介质; Pt电极; 解离吸附; 氧化; 原位红外反射光谱

Abstract:

The dissociative adsorption and oxidation of L-serine on platinum electrode in neutral solutions were studied via in situ FTIR reflection spectroscopy and electrochemical methods. The FTIRS results demonstrate that the serine can be easily dissociated on Pt surface at potentials below -0.6 V(vs.SCE) to form cyanide(~2100 cm^-1) and carbon monoxide(CO_L, ~2034 cm^-1; CO_B, ~1870 cm^-1). The observation of an absorption band at 2343 cm^-1 is ascribed to CO₂, which implies the cleavage of the C—C bond during the dissociative adsorption of serine. It has determined that the cyanide was strongly adsorbed on electrode surface in a wide potential region below 0.7 V(vs. SCE) and inhibited the oxidation of serine. At higher potentials, the serine molecules could be oxidized directly to yield the main product CO₂ species. As the pH decreased in the spectroelectrochemical cell during serine reactions, the acidic serine species also detected. The present study revealed the interaction of serine with Pt electrode surface, and suggested a possible reaction mechanism of serine on Pt electrode surface in neutral solutions.

Key words: L-Serine; Neutral solution; Pt electrode; Dissociative adsorption; Oxidation; in situ FTIRS

TrendMD:

孔德文, 朱天玮, 曾冬梅, 甄春花, 陈声培, 孙世刚. 中性介质中L-丝氨酸在Pt电极上解离吸附和氧化的原位FTIR研究. 高等学校化学学报, 2009, 30(10): 2040.

KONG De-Wen, ZHU Tian-Wei, ZENG Dong-Mei, ZHEN Chun-Hua, CHEN Sheng-Pei, .... in situ FTIR Spectroscopic Studies of Adsorption and Oxidation of L-Serine on Pt Electrodes in Neutral Solutions. Chem. J. Chinese Universities, 2009, 30(10): 2040.

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