| 铂电极上吸附芳香分子的表面增强红外光谱研究 |
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| 引用本文： | 严彦刚,徐群杰,蔡文斌.铂电极上吸附芳香分子的表面增强红外光谱研究[J].化学学报,2006,64(6):458-462. |
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| 作者姓名： | 严彦刚 徐群杰 蔡文斌 |
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| 作者单位： | (1复旦大学化学系 上海市分子催化和功能材料重点实验室 上海 200433)
(2上海电力学院环境工程系 上海 200090) |
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| 基金项目： | 国家自然科学基金(No.20473025)，教育部新世纪优秀人才计划(No.040349)，高等学校博士点专项科研基金(No.20040246008)，留学回国人员启动基金，上海市重点学科建设项目(P1304)，厦门大学固体表面物理化学国家重点实验室开放课题(No.2003003)资助项目. |
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| 摘 要： | 应用衰减全反射表面增强红外吸收光谱法分别研究了0.1 mol?L－1 HClO4中对硝基苯甲酸(PNBA)和0.1 mol?L－1 KClO4中吡啶(Py)在铂电极上的吸脱附. 结果表明在较高电位下(0.3～0.7 V vs. SCE) PNBA是通过其羧基脱质子后羧酸根的两个氧原子等位吸附在Pt电极表面, 而随着电位的负移, 除PNBA逐步脱附外, 还呈现出单个氧原子吸附的谱学特征. 光谱强度与电位的关系表明PNBA在铂电极表面吸脱附的中间电位约为0.2 V vs. SCE. 吡啶的吸附主要是通过氮原子的孤对电子及脱氢后的α碳原子与Pt电极表面键合. 在较宽的电位区间(0.4～－0.4 V vs. SCE)吡啶的吸附方式和取向基本维持不变.
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| 关 键 词： | 表面增强红外吸收光谱 铂纳米薄膜电极 对硝基苯甲酸 吡啶 吸附 |
| 收稿时间： | 08 2 2005 12:00AM |
| 修稿时间： | 2005-08-022005-12-05 |
Study of Electroadsorption of Aromatic Molecules on Pt Electrodes with Surface Enhanced IR Absorption Spectroscopy |
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| YAN Yan-Gang,XU Qun-Jie,CAI Wen-Bin.Study of Electroadsorption of Aromatic Molecules on Pt Electrodes with Surface Enhanced IR Absorption Spectroscopy[J].Acta Chimica Sinica,2006,64(6):458-462. |
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| Authors: | YAN Yan-Gang XU Qun-Jie CAI Wen-Bin |
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| Institution: | (1 Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry,
Fudan University, Shanghai 200433)
(2 Department of Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090) |
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| Abstract: | In situ ATR surface-enhanced IR absorption spectroscopy (ATR-SEIRAS) has been applied to study the adsorption of p-nitrobenzoic acid (PNBA) in 0.1 mol?L－1 HClO4 or pyridine (Py) in 0.1 mol?L－1 KClO4 on Pt electrodes. The results indicate that adsorption of PNBA at positive potential of 0.3 V vs. SCE yielded p-nitrobenzoate species bound to the surface through the carboxylate oxygen atoms with a bridging coordination. The PNBA was desorbed gradually as the potential shifted negatively, and might adopt single oxygen-atom coordination to H-bonded Pt surface. The transition potential for electroadsorption of PNBA on Pt electrodes was centered at ca. 0.2 V vs. SCE. As for the adsorption of Py on Pt electrodes, spectroscopic evidence pointed to the formation of α-pyridyl species nearly perpendicular to the Pt surface. Over the potential range between －0.4 and 0.4 V vs. SCE, the configuration and orientation of adsorbed Py remained virtually unchanged. |
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| Keywords: | surface-enhanced infrared absorption spectroscopy platinum nanofilm electrode para-nitro- benzoic acid pyridine adsorption |
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