CoPt纳米空心球甲醇电催化氧化和原位电化学傅里叶变换红外光谱研究

引用本文: 周新文, 甘亚利, 孙世刚. CoPt纳米空心球甲醇电催化氧化和原位电化学傅里叶变换红外光谱研究[J]. 物理化学学报, doi: 10.3866/PKU.WHXB201205031 shu

Citation: ZHOU Xin-Wen, GAN Ya-Li, SUN Shi-Gang. Studies of Oxidation Processes of Methanol on Hollow CoPt Nanospheres and In situ Electrochemical Fourier Transform Infrared Spectroscopy[J]. Acta Physico-Chimica Sinica, doi: 10.3866/PKU.WHXB201205031 shu

CoPt纳米空心球甲醇电催化氧化和原位电化学傅里叶变换红外光谱研究

基金项目:
国家自然科学基金(20833005)资助项目 (20833005)

摘要:

采用化学还原和电位置换法制备了CoPt 纳米空心球, 该催化剂对甲醇氧化表现出较好的电催化活性.透射电镜(TEM)、能量散射光谱(EDS)和电化学循环伏安实验结果表明, 在0.1 mol·L^-1 H₂SO₄+0.1 mol·L^-1CH₃OH中进行测试时, CoPt 纳米空心球发生了去合金化过程, 催化剂表面Co元素溶解, 形成了富Pt 表面, 表现出更好的电催化活性, 同时表现出较好的结构稳定性. 采用原位电化学红外光谱在分子水平研究了CoPt 纳米空心球上甲醇氧化过程, 发现甲醇在CoPt 纳米空心球氧化中间产物主要为CO, 且CO表现出异常红外效应, 与CO为探针分子在CoPt纳米空心球上得到的红外光谱结果一致. 研究结果表明, 去合金化方法是一种有效调节催化剂表面组成和性能的手段, 原位电化学红外光谱是潜在的原位研究有机小分子氧化机理的方法, 在燃料电池中将得到广泛的应用.

关键词:

English

Studies of Oxidation Processes of Methanol on Hollow CoPt Nanospheres and In situ Electrochemical Fourier Transform Infrared Spectroscopy

1.
1. Department of Chemistry, College of Chemistry and Life Science, Three rges University, Yichang 443002, Hubei Province, P. R. China;
2. State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
Received Date: 07 March 2012
Available Online: 02 August 2012
Fund Project:
国家自然科学基金(20833005)资助项目

Abstract:

Hollow CoPt nanospheres were synthesized by chemical reduction and galvanic displacement reactions. The catalyst showed od electrocatalytic activity for methanol oxidation. The results of transmission electron microscopy (TEM), energy dispersive spectromenter (EDS), and electrochemical cyclic voltammograms indicated that, in the process of electrochemical experiments carried in 0.1 mol·L^-1 H₂SO₄ and 0.1 mol·L^-1CH₃OH, hollow CoPt nanospheres were dealloying, which induced the dissolution of elemental Co from the surface of the catalyst. After the dealloying process, more Pt active sites were exposed on the surface of the catalyst and the catalyst showed better catalytic activity, as well as enhanced structural stability. The electrooxidation of methanol on the hollow CoPt nanospheres was studied on the molecular level using in situ electrochemical Fourier transform infrared (FTIR) spectroscopy. The toxic intermediate CO observed on the CoPt nanorods displayed abnormal infrared effects (AIREs). The FTIR results were similar to those obtained in an earlier experiment on the hollow CoPt nanospheres using CO as a probe molecule. All the results suggested that the dealloying method would be a useful technique for regulating the composition and performance of the catalyst. In situ electrochemical FTIR was highlighted as a potential method for studying the oxidation processes of organic molecules. It is envisaged that these methods will be widely used in the field of fuel cell research.

Key words:

Hollow CoPt nanosphere
/ Dealloying process
/ Methanol oxidation
/ In situ electrochemical FTIR spectroscopy
/ Fuel cell

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

CoPt纳米空心球甲醇电催化氧化和原位电化学傅里叶变换红外光谱研究

English

Studies of Oxidation Processes of Methanol on Hollow CoPt Nanospheres and In situ Electrochemical Fourier Transform Infrared Spectroscopy

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

CoPt纳米空心球甲醇电催化氧化和原位电化学傅里叶变换红外光谱研究

English

Studies of Oxidation Processes of Methanol on Hollow CoPt Nanospheres and In situ Electrochemical Fourier Transform Infrared Spectroscopy

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

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