Oxygen Reduction Reaction on Glycin Modified Pt(111) Electrode

Authors

Ming-fang LI, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;
Jing KANG, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;
Ling-wen LIAO, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;
Yan-xia CHEN, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;Follow
Shen YE, Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan;

Corresponding Author

Yan-xia CHEN(yachen@ustc.edu.cn)

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.

Graphical Abstract

Keywords

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

DOI Link

https://doi.org/10.61558/2993-074X.2096

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Publication Date

2013-02-28

Online Available Date

2012-07-05

Revised Date

2012-06-30

Received Date

2012-06-04

Recommended Citation

Ming-fang LI, Jing KANG, Ling-wen LIAO, Yan-xia CHEN, Shen YE. Oxygen Reduction Reaction on Glycin Modified Pt(111) Electrode[J]. Journal of Electrochemistry, 2013 , 19(1): 37-42.
DOI: 10.61558/2993-074X.2096
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss1/3