暂态电化学表面增强拉曼光谱研究对硝基苯硫酚分子的电化学还原过程

凌   云; 汤  儆; 刘国坤; 宗   铖

doi:10.13208/j.electrochem.190709

电化学 >

2019 , Vol. 25 >Issue 6: 731 - 739

DOI: https://doi.org/10.13208/j.electrochem.190709

研究论文

暂态电化学表面增强拉曼光谱研究对硝基苯硫酚分子的电化学还原过程

凌云 ,
汤儆 ,
刘国坤 ,
宗铖

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1. 福建省现代分离分析科学与技术重点实验室，污染监测与控制省高校重点实验室，闽南师范大学化学化工与环境学院，福建漳州 363000；2. 食品安全与生物分析教育部重点实验室，福州大学化学学院，福建福州 350116；3. 近海海洋环境科学国家重点实验室，厦门大学环境与生态学院，福建厦门 361102； 4. 固体表面物理化学国家重点实验室，厦门大学化学化工学院，福建厦门 361005

收稿日期: 2019-07-09

修回日期: 2019-09-18

网络出版日期: 2019-12-28

基金资助

国家自然科学基金项目（No. 21573043, No. 21473140）、福建省自然科学基金面上项目（No. 2019J01746）以及食品安全与生物分析教育部重点实验室开放基金（No. FS18019）资助

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Transient Electrochemical Surface-Enhanced Raman Spectroscopic Study in Electrochemical Reduction of P-Nitrothiophenol

LING Yun ,
TANG Jing ,
LIU Guo-kun ,
ZONG Cheng

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1. Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Fujian Provincial Key Laboratory of Pollution Monitoring and Control, College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou, 363000, Fujian, China; 2. Key laboratory for analytical science of food safety and biology, Ministry of Education, College of Chemistry, Fuzhou University, Fuzhou 350116, Fujian, China; 3. State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, Fujian, China; 4. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry,College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China

Received date: 2019-07-09

Revised date: 2019-09-18

Online published: 2019-12-28

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摘要

对硝基苯硫酚是表面增强拉曼光谱研究中最常用的探针分子之一，对硝基苯硫酚在电极表面电化学还原反应的研究有助于对芳香族硝基化合物还原机理的认识. 本文应用暂态电化学-表面增强拉曼光谱技术，研究了对硝基苯硫酚在循环伏安和计时电流法过程中的表面增强拉曼光谱. 结果表明，实验实现了完全与电化学检测时间分辨率同步的表面增强拉曼光谱检测，以最快5毫秒的时间分辨率研究了对硝基苯硫酚分子在金电极表面的还原过程. 结果分析推测其此反应过程极快，在5毫秒的时间分辨率下仍难以捕获其中间物种. 本研究为人们更深层次研究和认识硝基苯类化合物电化学还原过程提供了参考和方向.

关键词： 暂态电化学-表面增强拉曼光谱; 时间分辨表面增强拉曼光谱; 循环伏安法; 计时电流法; 对硝基苯硫酚

本文引用格式

凌云 , 汤儆 , 刘国坤 , 宗铖 . 暂态电化学表面增强拉曼光谱研究对硝基苯硫酚分子的电化学还原过程[J]. 电化学, 2019 , 25(6) : 731 -739 . DOI: 10.13208/j.electrochem.190709

Abstract

P-nitrothiophenol (PNTP) is one of the most common probe molecules studied by surface-enhanced Raman spectroscopy (SERS). The research in electrochemical reduction behavior of PNTP will help understanding the mechanism for the nitrobenzene reduction. In this paper, we used transient electrochemical surface-enhanced Raman spectroscopy (TEC-SERS) to study the SERS of PNTP with cyclic voltammetry and chronoamperometry on gold electrodes. The results show that the TEC-SERS provide a time resolution that equals the transient electrochemical methods, and we concluded that the reaction was so quick that we did not observe the spectral information of intermediate species described in the literatures with a 5-ms temporal resolution. Such studies will assist a deep understanding in the electrochemical reduction of nitrobenzene.

Key words： transient electrochemical surface-enhanced Raman spectroscopy; time-resolved electrochemical surface-enhanced Raman spectroscopy; cyclic voltammetry; chronoamperometry; p-nitrothiophenol

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