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Citation: Shi Chongtie, Zhu Rongzhao. STUDY ON ANODIC FORMATION OF SO₈^2- ION ON PbO₂ ELECTRODE[J]. Chinese Journal of Applied Chemistry, ;1987, 4(4): 35-39. shu

STUDY ON ANODIC FORMATION OF SO₈^2- ION ON PbO₂ ELECTRODE

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 27 April 1986
Available Online: 25 June 1986

The kinetic data related respectively to S₂O₈^2- formation and O₂ evolution on PbO₂ anode in H₂SO₄ and H₂SO₄-(NH₄)₂SO₄ solutions were obtained by methoed of resolving the steady state polarization curve. The Tafel slopes for both S₂O₈^2- formation and O₂ evolution were 2.303 RT/βF (β=0.52-0.55) at potential higher than+2.25V vs SHE. The current efficiency of S₂O₈^2- formation was lower than 29% and it almost remained unchanged with potentials. The reaction order of S₂O₈^2- formation with respect to sulfate ions was found to be zero, while the O₂ evolution rate was found to deerease slightly with the increase of sulfate concentration at high potential. A mechanism for above two processes was proposed.
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STUDY ON ANODIC FORMATION OF SO₈^2- ION ON PbO₂ ELECTRODE