甘氨酸修饰的Pt(111)电极上的氧还原

doi:10.61558/2993-074X.2096

电化学（中英文） ›› 2013, Vol. 19 ›› Issue (1): 37-42. doi: 10.61558/2993-074X.2096

• 电化学材料基础与表界面研究专辑（中国科学院化学研究所万立骏院士主编） • 上一篇下一篇

甘氨酸修饰的Pt(111)电极上的氧还原

李明芳¹，康婧¹，廖玲文¹，陈艳霞¹*，叶深²

1.中国科学技术大学合肥微尺度物质科学国家实验室，化学与材料科学学院化学物理系，安徽合肥 230026； 2.北海道大学催化化学研究中心，日本札幌

收稿日期:2012-06-04 修回日期:2012-06-30 出版日期:2013-02-28 发布日期:2012-07-05
通讯作者: 陈艳霞 E-mail:yachen@ustc.edu.cn
基金资助:
国家自然基金面上项目（No. 21073176）资助

Oxygen Reduction Reaction on Glycin Modified Pt(111) Electrode

LI Ming-fang¹, KANG Jing¹, LIAO Ling-wen¹, CHEN Yan-xia¹*, YE Shen²

1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China; 2. Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan

Received:2012-06-04 Revised:2012-06-30 Published:2013-02-28 Online:2012-07-05
Contact: CHEN Yan-xia E-mail:yachen@ustc.edu.cn

摘要/Abstract

摘要： 利用单晶旋转圆盘电极技术（Hanging Meniscus Rotating Disk Electrode,　HMRD）在硫酸和高氯酸溶液中分别研究了甘氨酸修饰的Pt(111)电极表面氧分子的电催化还原反应. 实验发现：在硫酸溶液中，经甘氨酸修饰的Pt(111)电极表面的氧还原活性明显提高，其中氧还原的半波电位与Pt(111)电极的相比正移约0.1 V，而在高氯酸溶液中，甘氨酸修饰的Pt(111)电极的活性几乎没有发生变化. 该实验结果表明：甘氨酸修饰的Pt(111)电极一方面抑制了SO₄^2-在电极表面的吸附，另一方面又能在电极表面提供相邻的空位供氧分子吸附. 通过与文献中报道的CN^-修饰的Pt(111)电极上的氧还原结果的对比，可以推测甘氨酸修饰的Pt(111)电极表面氧还原活性提高是由于甘氨酸在Pt(111)表面可能先被氧化成CN^-后吸附在电极表面，进而促进了氧分子的电催化还原反应.

关键词: Pt(111)单晶电极, 氧还原, 甘氨酸修饰, 几何效应

Abstract: Oxygen reduction reaction (ORR) on glycin (NH2CH2COOH) modified Pt(111) electrode has been investigated using hanging meniscus rotating disk electrode system (HMRD) in 0.05 mol•L^-1 H₂SO₄ and 0.1 mol•L^-1 HClO₄ solutions, respectively. Cyclic voltammograms of the glycin modified Pt (111) electrode measured in 0.05 mol•L^-1 H₂SO₄ solution similar to that of CN^- modified Pt(111) electrodes, demonstrating that sulfate adsorption is strongly inhibited at the glycin modified Pt(111). From the polarization curve of ORR recorded in 0.05 mol•L^-1 H₂SO₄ solution, it is found that the ORR activity at the glycin modified Pt (111) is greatly enhanced with the half wave potential (E_1/2) of ORR being shifted ca. 0.1 V positively, which is close to the activity of ORR at the unmodified Pt(111) in 0.1 mol•L^-1 HClO₄ solution. The improved ORR activity is explained by geometric effect due to the formation of well organized CN^-adlayer at Pt(111) from the oxidative decomposition of glycin, which effectively inhibits the adsorption of sulfate anions.

Key words: Pt(111) electrode, oxygen reduction reaction, NH₂CH₂COOH modified electrode, geometric effect

中图分类号:

O646

李明芳, 康婧, 廖玲文, 陈艳霞, 叶深. 甘氨酸修饰的Pt(111)电极上的氧还原[J]. 电化学（中英文）, 2013, 19(1): 37-42.

LI Ming-fang, KANG Jing, LIAO Ling-wen, CHEN Yan-xia, YE Shen. Oxygen Reduction Reaction on Glycin Modified Pt(111) Electrode[J]. Journal of Electrochemistry, 2013, 19(1): 37-42.

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https://electrochem.xmu.edu.cn/CN/Y2013/V19/I1/37

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甘氨酸修饰的Pt(111)电极上的氧还原

Oxygen Reduction Reaction on Glycin Modified Pt(111) Electrode

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