In situ Surface-Enhanced Raman Spectroscopic Investigation of Formaldehyde Oxidation on Aucore@Ptshell Nanoparticles Coated Platinum Electrode in Different Media

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (6): 1205.

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In situ Surface-Enhanced Raman Spectroscopic Investigation of Formaldehyde Oxidation on Au_core@Pt_shell Nanoparticles Coated Platinum Electrode in Different Media

RAO Gui-Shi^1,2, ZHANG Lei¹, KE Hui-Xian³, ZHONG Qi-Ling¹*, REN Bin³*, TIAN Zhong-Qun³

1. College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China;
2. Jiangxi Institute of Safety Science and Technology, Nanchang 330046, China;
3. State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemistry Engineering, Xiamen University, Xiamen 361005, China

Received:2008-08-28 Online:2009-06-10 Published:2009-06-10
Contact: ZHONG Qi-Ling, E-mail: zhqiling@163.com; REN Bin, E-mail: bren@xmu.edu.cn
Supported by:
国家自然科学基金(批准号: 20663002)、厦门大学固体表面物理化学国家重点实验室基金(批准号: 200511)和江西省自然科学基金(批准号: 0620025)资助.

Abstract

Abstract:

Au_core@Pt_shell nanoparticles were synthesized by chemical reduction method. The samples were cha-racterized by scanning electron microscope(SEM) and energy dispersive spectroscopy(EDS). In situ surface-enhanced Raman spectroscopy(SERS) was utilized to investigate the electro-oxidation behavior of formaldehyde in different media adsorbed on Au_core@Pt_shell nanoparticles coated platinum electrode. Surface-enhanced Raman scattering spectra with high quality were acquired. The results show that formaldehyde can dissociate spontaneously to produce strongly adsorbed intermediate, CO, in acidic, neutral, and alkaline media on a Au_core@Pt_shell nanoparticles coated platinum electrode. However, the bridge adsorbed CO were increased more significantly in alkaline media. In addition, the bridge adsorbed CO could be oxidized more easily than the linear adsorbed CO. The Raman signal of CO disappeared at -0.4 V in alkaline media, it shifted negatively about 950 mV than in acidic or neutral media.The study demonstrates that Au_core@Pt_shell nanoparticles coated on platinum substrate as electrode exhibited better electrocatalytic properties for the oxidation of formaldehyde in alkaline media than in acidic or neutral media.

Key words: Surface-enhanced Raman spectroscopy(SERS), Formaldehyde, Electrocatalytic, Oxidation, Au_core@Pt_shell/Pt electrode

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RAO Gui-Shi, ZHANG Lei, KE Hui-Xian, ZHONG Qi-Ling*, REN Bin*, TIAN Zhong-Qun. In situ Surface-Enhanced Raman Spectroscopic Investigation of Formaldehyde Oxidation on Au_core@Pt_shell Nanoparticles Coated Platinum Electrode in Different Media[J]. Chem. J. Chinese Universities, 2009, 30(6): 1205.

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In situ Surface-Enhanced Raman Spectroscopic Investigation of Formaldehyde Oxidation on Au_core@Pt_shell Nanoparticles Coated Platinum Electrode in Different Media

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