The Effect of Some Ions on Cr₂O₇^2- Anodic Formation Process at Pt and PbO₂ Electrodes

Authors

Shixiong Jin, Department of Chemistry, Nankai University, Tianjin 300071
Zhigang Zhou, Department of Chemistry, Nankai University, Tianjin 300071
Lan Wang, Department of Chemistry, Nankai University, Tianjin 300071

Corresponding Author

Shixiong Jin

Abstract

The influence of Ag₂SO₄, Li₂SO₄, Na₂SO₄, K₂SO₄, (NH₄)₂SO₄,MgSO₄ and KF on the evolution of O₂ and the formation of Cr₂O at Pt and PbO₂ anodes was investigated in mixed H₂SO₄-Cr₂(SO₂)₃ solutions. The kinetic data related respectively to Cr₂O formation and O₂ evolution at Pt and PbO₂ anodes were measured by method of resolving the steady-state polarization curve. The Tafel slope of steady-state φ～lgi relationships for Cr₂O formation reaction is close to 2×2.303 RT/βF, whereas for O₂ evolution it is close to 2.303 RT/βF(with β=0.5). The results indicate thatthe current efficiency for Cr₂O formation is increased by adding Ag⁺ ions to the anolyte and decreasedby adding Li⁺,Na⁺,K⁺, NH₄⁺ and Mg²⁺ ions to the anolyte at Pt electrode. While on PbO₂ electrode, the current efficiency of Cr₂O formation is decreased by adding Ag⁺ and F^- ions to the anolyte and increased by adding K⁺ ions to the anolyte.

Keywords

Platinum electrode, Lead dioxide electrode, Anodic formation of Cr2O ion, Anodic evolution of oxygen

DOI Link

https://doi.org/10.61558/2993-074X.1272

Publication Date

1995-02-28

Online Available Date

1995-02-28

Revised Date

1994-09-20

Received Date

1994-08-20

Recommended Citation

Shixiong Jin, Zhigang Zhou, Lan Wang. The Effect of Some Ions on Cr₂O₇^2- Anodic Formation Process at Pt and PbO₂ Electrodes[J]. Journal of Electrochemistry, 1995 , 1(1): 101-104.
DOI: 10.61558/2993-074X.1272
Available at: https://jelectrochem.xmu.edu.cn/journal/vol1/iss1/17