不同介质中甲醛在Aucore@Ptshell/Pt电极上氧化的原位SERS研究

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (6): 1205.

不同介质中甲醛在Au_core@Pt_shell/Pt电极上氧化的原位SERS研究

饶贵仕^1,2, 章磊¹, 柯慧贤³, 钟起玲¹, 任斌³, 田中群³

1. 江西师范大学化学化工学院, 南昌 330022;
2. 江西省安全生产科学技术研究中心, 南昌 330046;
3. 厦门大学化学化工学院, 固体表面物理化学国家重点实验室, 厦门 361005

收稿日期:2008-08-28 出版日期:2009-06-10 发布日期:2009-06-10
通讯作者: 钟起玲, 男, 教授, 主要从事表(界)面电化学、光谱电化学和纳米电化学研究, E-mail: zhqiling@163.com; 任斌, 男, 博士, 教授, 主要从事表面增强光谱、针尖增强拉曼光谱和界面电化学研究, E-mail: bren@xmu.edu.cn
基金资助:
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.

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.

摘要/Abstract

摘要：

应用化学还原法合成了Au_core@Pt_shell纳米粒子, 并用扫描电子显微镜(SEM)和能量色散光谱(EDS)对其进行了表征; 采用电化学原位表面增强拉曼散射(SERS)光谱技术研究了不同介质中甲醛在Au_core@Pt_shell/Pt电极上的电催化氧化行为, 获得了不同介质中甲醛在Au_core@Pt_shell/Pt电极上电催化氧化行为的原位SERS谱. 研究结果表明, 不论在酸性、中性还是碱性介质中, 甲醛均能在Au_core@Pt_shell/Pt电极上自发氧化解离出强吸附中间体CO, 只是在碱性介质中桥式吸附CO的比例明显增大, 且桥式吸附比线形吸附CO更易被氧化, 使CO在碱性介质中基本氧化完毕的电位比在中性及酸性介质中提前了约950 mV. 分子水平的研究结果表明, CO和甲醛在碱性介质中比在中性和酸性介质中更易被氧化.

关键词: 表面增强拉曼散射光谱, 甲醛, 电催化, 氧化, Au_core@Pt_shell/Pt电极

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

TrendMD:

饶贵仕, 章磊, 柯慧贤, 钟起玲, 任斌, 田中群. 不同介质中甲醛在Au_core@Pt_shell/Pt电极上氧化的原位SERS研究. 高等学校化学学报, 2009, 30(6): 1205.

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

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