Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (07): 654-658.doi: 10.3866/PKU.WHXB19950718

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Electrocatalytic Effect of Oxygen by Anodic Evlution Ag(I) Co(II) and Ni(II) Ions

Jin Shi-Xiong,Wang Lan,Sun Feng   

  1. Department of Chemistry,Nankai University,Tianjin 300071
  • Received:1994-06-17 Revised:1994-09-28 Published:1995-07-15
  • Contact: Jin Shi-Xiong

Abstract:

Influence of Ag(Ⅰ), Co(Ⅱ) and Ni(Ⅱ) ions on oxygen anodic evolution at Pt and Ti/Pt/PbO2 electrodes was investigated in surphuric acid solutions. The oxygen evolution reaction at Ti/Pt/PbO2 electrode in surphuric acid solutions is characterized by two linearφ~ lgi relationships. At low c.d. it is close to 2.303RT/(1+β)F, whereas at high c.d. it is close to 2.303RT/βF. In the presence of Ag(Ⅰ) or Ni(Ⅱ) ions in the electrolytic solution the Tafel slope of oxygen evolution tends to be low, 2.303RT/(1+β)F (withβ=0.5). However, the oxygen evolution reaction at Pt electrodes in H2SO4 or CoSO4﹢H2SO4 solutions is characterized by one linearφ~ lgi relationship. The Tafel slope is close to 2.303RT/βF. In the presence of Ag(Ⅰ) or Ni(Ⅱ) ions in the electrolytic solution the Tafel slope of oxygen evolution tends to be low, 2.303RT/(1+β)F. The oxygen anodic evolution reactions are catalyzed by Ag(Ⅰ), Co(Ⅱ) and Ni(Ⅱ) ions in the electrolytic solution. When Ag(Ⅰ) or Ni(Ⅱ) was mixed with Co(Ⅱ), a promising catalyst for oxygen anodic evolution with higher catalyst activity than either of them alone was found. A comparison of the PbO2 electrode and the Pt electrode has also been given.

Key words: Ag(I) and Co(II) ions, Oxygen anodic evolution, Platinum electrode, Lead dioxide electrode, Electrocatalysis