A molecular-level understanding of CO adsorption behavior would be greatly beneficial to resolving the problem of CO poisoning in fuel cells and medical science. Herein, an efficient borrowing strategy based on surface enhanced Raman scattering (SERS) has been developed to investigate the adsorption behavior of CO at the gas–solid interface. A composite SERS substrate with high uniformity was fabricated by electrochemical deposition of optimal Pt over-layers onto an Au nanoparticle film. The results indicated that the linearly bonded mode follows the Langmuir adsorption curve (type I), while the multiply bonded did not. It took a longer time for the C–OM vibration to reach the adsorption equilibrium than that of C–OL. The variation tendency toward the Pt–COL frequency was in opposition to that of C–OL, caused by the chemical and dipole–dipole coupling effects. The increase in dynamic coupling effects of the CO molecules caused a blue shift in νCO and a red shift of the Pt–CO band, while its shielding effect on SERS intensity cannot be ignored. Additionally, higher pressure is more conducive for linear adsorption to achieve saturation. Density functional theory calculations were employed to explore the adsorption mechanisms. It should also be noted that the substrate with good recycling performance greatly expands its practical application value. The present study suggested that the SERS-based borrowing strategy shows sufficient even valuable capacity to investigate gas adsorption kinetics behavior.
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21 December 2020
Research Article|
December 21 2020
Surface-enhanced Raman spectroscopic investigation on adsorption kinetic of carbon monoxide at the solid–gas interface
Special Collection:
Spectroscopy and Microscopy of Plasmonic Systems
Ming Ge;
Ming Ge
1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University
, Suzhou 215123, China
2
College of Chemistry and Chemical Engineering, Nantong University
, Nantong 226001, China
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Minmin Xu;
Minmin Xu
1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University
, Suzhou 215123, China
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Yaxian Yuan;
Yaxian Yuan
a)
1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University
, Suzhou 215123, China
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Qinghua Guo;
Qinghua Guo
1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University
, Suzhou 215123, China
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Renao Gu;
Renao Gu
1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University
, Suzhou 215123, China
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Jianlin Yao
Jianlin Yao
a)
1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University
, Suzhou 215123, China
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Note: This paper is part of the JCP Special Topic on Spectroscopy and Microscopy of Plasmonic Systems.
J. Chem. Phys. 153, 234704 (2020)
Article history
Received:
September 28 2020
Accepted:
November 30 2020
Citation
Ming Ge, Minmin Xu, Yaxian Yuan, Qinghua Guo, Renao Gu, Jianlin Yao; Surface-enhanced Raman spectroscopic investigation on adsorption kinetic of carbon monoxide at the solid–gas interface. J. Chem. Phys. 21 December 2020; 153 (23): 234704. https://doi.org/10.1063/5.0031193
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