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Citation: CAO Jiang-Lin, WU Zu-Cheng, LI Hong-Xia, ZHANG Jian-Qing. Inactivation of PbO₂ Anodes during Oxygen Evolution in Sulfuric Acid Solution[J]. Acta Physico-Chimica Sinica, ;2007, 23(10): 1515-1519. doi: 10.3866/PKU.WHXB20071006 shu

Inactivation of PbO₂ Anodes during Oxygen Evolution in Sulfuric Acid Solution

1.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, P. R. China; School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, P. R. China; Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China; 4State Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China

Received Date: 2 February 2007
Available Online: 28 August 2007

Ti-substrate PbO₂ (Ti/PbO₂) anodeswith Sb-doped SnO₂ interlayer were prepared by thermal decomposition-electroplating technique. The behavior and mechanism of the inactivation of Ti/PbO₂ anodes were studied by the
accelerated life test, electrochemical impedance spectrum, XRD and SEM-EDX. The results showed that the inactivation of Ti/PbO₂ anodes was a developing process. During oxygen evolution, partial active oxygen atoms produced as intermediate product diffuse toward Ti substrate, and they oxidize Pb³⁺ to Pb⁴⁺ in the PbO₂coating to occupy gradually the oxygen vacancies as free electron donors. This results in not only the decrease of conductivity but also a change of intrinsic stresses from tensile stresses to compressive stresses. When the process was finished on the whole, large numbers of active oxygen atoms began to diffuse to Ti substrate. The oxidation of Ti substrate led to
the production of an interfacial stresses. Under the effects of compressive intrinsic stresses and interfacial stresses, PbO₂ coating knobs out, subsequently flakes off and Ti/PbO2 anodes become inactive rapidly.
- Inactivation; PbO₂ anode; Intrinsic stress
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Inactivation of PbO2 Anodes during Oxygen Evolution in Sulfuric Acid Solution

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通讯作者: 陈斌, bchen63@163.com

Inactivation of PbO₂ Anodes during Oxygen Evolution in Sulfuric Acid Solution