[碱性溶液中吸附在钯纳米薄膜电极上的一氧化碳和氰根离子的原位傅里叶变换红外光谱研究]

[In situ FTIR spectrocopic studies of CO and CN- adsorbed on electrode of nanometer thin film of palladium in alkaline solutions].

作者信息

Sun S, Cai L, Zhou Z, Chen S

机构信息

State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Institute of Physical Chemistry, Xiamen University, 361005 Xiamen.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2000 Oct;20(5):601-2.

PMID:12945389

Abstract

The adsorption and coadsorption of CO and CN- on electrode of nanometer thin film of palladium (nm-Pd/GC) was studied by using in situ FTIR spectroscopy. The results demonstrated that the nm-Pd/GC electrode exhibited abnormal infrared effects (AIREs) in alkaline solutions as in acid solutions. The characters of AIREs, i.e., the inversion of the direction of IR band, the augmentation of FWHM and the significant enhancement of IR absorption by adsorbed species were observed in all cases of adsorption and coadsorption of CO and CN-. It has been illustrated that strong interaction is existed between adsorbed CO and CN- on nm-Pd/GC surface. The study has contributed towards understanding the surface processes of chemisorption as well as to reveal the origin of nanometer size-effects of thin film materials.

摘要

采用原位傅里叶变换红外光谱法研究了CO和CN-在钯纳米薄膜电极（nm-Pd/GC）上的吸附和共吸附。结果表明，nm-Pd/GC电极在碱性溶液中与在酸性溶液中一样，表现出异常红外效应（AIREs）。在CO和CN-的所有吸附和共吸附情况下，均观察到AIREs的特征，即红外波段方向反转、半高宽增大以及吸附物种的红外吸收显著增强。结果表明，在nm-Pd/GC表面，吸附的CO和CN-之间存在强相互作用。该研究有助于理解化学吸附的表面过程，并揭示薄膜材料纳米尺寸效应的起源。