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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)

甘氨酸修饰的Pt(111)电极上的氧还原

  • 李明芳 ,
  • 康婧 ,
  • 廖玲文 ,
  • 陈艳霞 ,
  • 叶深
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  • 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

  网络出版日期: 2012-07-05

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-Fang ,
  • KANG Jing ,
  • LIAO Ling-Wen ,
  • CHEN Yan-Xia ,
  • YE Shen
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  • 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 date: 2012-06-04

  Revised date: 2012-06-30

  Online published: 2012-07-05

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SO42-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.

本文引用格式

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, 2013 , 19(1) : 37 -42 . DOI: 10.61558/2993-074X.2096

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 (E1/2) 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.
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