In-Situ Raman Spectroscopic Study of the Oxidation and Reduction of Ag Electrode in Na₂SO₄

Authors

Yan-xia CHEN, State Key Lab. for Phy. Chem. of Solid Surfaces, Inst. of Phy. Chem. and Dept. of Chem., Xiamen Univ., Xiamen 361005
Kai-qi HUANG, State Key Lab. for Phy. Chem. of Solid Surfaces, Inst. of Phy. Chem. and Dept. of Chem., Xiamen Univ., Xiamen 361005
Zhong-qun TIAN, State Key Lab. for Phy. Chem. of Solid Surfaces, Inst. of Phy. Chem. and Dept. of Chem., Xiamen Univ., Xiamen 361005

Corresponding Author

Zhong-qun TIAN

Abstract

In-situ Raman spectroscopy combined with cyclic voltammogram measurements was used to investigate formation of oxygen species at Ag electrode surfaces during the oxidation and reduction process in 0.1 mol/L Na₂SO₄ solution. The time dependent Raman spectra show that at potentials positive of 0.2 V, adsorption of oxygen atom occurs, while at the potentials positive of 0.4 V, some oxygen atoms migrate into subsurface of the Ag electrode and the other form strongly bound oxygen on the surface through chemical bond. At the same potentials, part of the silver atoms are oxidized and form Ag₂SO₄. During the negative potential ex cursion, the band centered at 960 and 1054 cm_-1 respectively at about 0.3 V, indicates that the reduction current peak at 0.34 V is resulted from the reduction of the Ag₂SO₄. Another reduction current peak at 0.24 V, which corresponds to the decomposing of the surface oxygen species.

Keywords

In-situ Raman spectroscopy, Ag electrodes, oxidation and reduction processes

DOI Link

https://doi.org/10.61558/2993-074X.2686

Publication Date

1998-05-28

Online Available Date

1998-05-28

Revised Date

1998-05-20

Received Date

1997-10-11

Recommended Citation

Yan-xia CHEN, Kai-qi HUANG, Zhong-qun TIAN. In-Situ Raman Spectroscopic Study of the Oxidation and Reduction of Ag Electrode in Na₂SO_{4[J]. Journal of Electrochemistry, 1998 , 4(2): 135-141.
DOI: 10.61558/2993-074X.2686
Available at: https://jelectrochem.xmu.edu.cn/journal/vol4/iss2/6}