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| PtRu/C电催化剂上甲醇吸附氧化过程的电化学原位红外光谱 | |
| 引用本文： | 王琪,孙公权,闫世友,汪国雄,辛勤,陈青松,李君涛,姜艳霞,孙世刚.PtRu/C电催化剂上甲醇吸附氧化过程的电化学原位红外光谱[J].高等学校化学学报,2006,27(11):2123-2127. |
| 作者姓名： | 王琪 孙公权 闫世友 汪国雄 辛勤 陈青松 李君涛 姜艳霞 孙世刚 |
| 作者单位： | 1. 中国科学院大连化学物理研究所,大连,116023;中国科学院研究生院,北京,100039 2. 中国科学院大连化学物理研究所,大连,116023 3. 厦门大学化学系,固体表面物理化学国家重点实验室,厦门,361005 |
| 摘 要： | 采用调变的多元醇法制备了高分散的Pt/C, PtRu/C和Ru/C电催化剂. XRD计算结果表明, PtRu/C电催化剂的平均粒径和合金度分别为2.2 nm和71%. 采用电化学方法和原位傅里叶变换红外反射光谱方法(in situ FTIRS)研究了甲醇在3种电催化剂上的吸附氧化过程, 发现PtRu/C对甲醇的催化活性明显高于Pt/C, Ru的加入一方面影响了甲醇在Pt上的解离吸附性能, 另一方面提供了Ru-OH物种, 从而抑制了低电位下电催化剂中毒. 红外光谱研究结果表明, 线性吸附态CO(COL)是主要毒化物种, 反应产物主要是CO2, 还有少量的甲酸甲酯. 根据实验结果讨论了甲醇在PtRu/C电催化剂上的氧化机理. |
| 关 键 词： | 直接甲醇燃料电池 PtRu/C 甲醇氧化 电化学 in situ FTIRS |
| 文章编号： | 0251-0790（2006）11-2123-05 |
| 收稿时间： | 12 14 2005 12:00AM |
| 修稿时间： | 2005-12-14 |
In situ Electrochemical FTIR Spectroscopy of Adsorption and Oxidation Process of Methanol on PtRu/C Electrocatalyst |
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| WANG Qi,SUN Gong-Quan,YAN Shi-You,WANG Guo-Xiong,XIN Qin,CHEN Qing-Song,LI Jun-Tao,JIANG Yan-Xia,SUN Shi-Gang.In situ Electrochemical FTIR Spectroscopy of Adsorption and Oxidation Process of Methanol on PtRu/C Electrocatalyst[J].Chemical Research In Chinese Universities,2006,27(11):2123-2127. | |
| Authors: | WANG Qi SUN Gong-Quan YAN Shi-You WANG Guo-Xiong XIN Qin CHEN Qing-Song LI Jun-Tao JIANG Yan-Xia SUN Shi-Gang |
| Affiliation: | 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China ; 2. Graduate School of the Chinese Academy of Sciences, Belting 100039, China ; 3. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University , Xiamen 361005, China |
| Abstract: | A modified polyol process was used to prepare Pt/C,PtRu/C and Ru/C electrocatalysts.Calcula-ted from XRD patterns,the mean particle size of PtRu/C electrocatalyst was 2.2 nm and the percentage of Ru alloyed was 71%,respectively.Adsorption and electro-oxidation progress of methanol on PtRu/C electrocatalyst was investigated by in situ FTIRS,combined with electrochemical experiments.It is revealed that the activity of PtRu/C electrocatalyst for methanol oxidation was much higher than that of Pt/C.Addition of Ru in PtRu/C electrocatalyst changed the characteristic of methanol adsorption,and Ru-OH species could oxidize linear bonded CO(CO_L) at a lower potential,thus inhibited the catalyst poisoning.In addition,from FTIRs results,CO_L was evidently identified to the main poisonous species and the major product was CO_2.Methyl formate was also identified.Based on these results,the mechanism of methanol oxidation was discussed. |
| Keywords: | Direct methanol fuel cell PtRu/C Methanol oxidation Electrochemistry In situ FTIR |
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