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高等学校化学研究 ›› 2014, Vol. 30 ›› Issue (5): 800-805.doi: 10.1007/s40242-014-4137-4

• Articles • 上一篇    下一篇

Oxygen-evolving SnO2-based Ceramic Anodes in Aluminium Electrolysis

POPESCU Ana-Maria   

  1. Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy, 060021-Bucharest, Romania
  • 收稿日期:2014-04-16 修回日期:2014-05-08 出版日期:2014-10-01 发布日期:2014-06-16
  • 通讯作者: POPESCU Ana-Maria E-mail:popescuamj@yahoo.com
  • 基金资助:

    Surpported by the Research Program of the Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy.

Oxygen-evolving SnO2-based Ceramic Anodes in Aluminium Electrolysis

POPESCU Ana-Maria   

  1. Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy, 060021-Bucharest, Romania
  • Received:2014-04-16 Revised:2014-05-08 Online:2014-10-01 Published:2014-06-16
  • Contact: POPESCU Ana-Maria E-mail:popescuamj@yahoo.com
  • Supported by:

    Surpported by the Research Program of the Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy.

摘要:

This study deals with SnO2-based ceramic anodes doped with Sb2O3 and CuO, aiming at contributing new data regarding their electrochemical behavior in cryolite melts. The performances of the anodes were evaluated by anodic polarization, cyclic voltammetry, and current efficiency and corrosion measurements. The investigation proves that the anodic process of SnO2-based inert anodes occurs at a low overvoltage and the oxygen discharge takes place in one step with an exchange of two electrons. The current efficiency and corrosion were proved to be dependent on the electrolysis parameters and composition of electrolysis bath. For a long term electrolysis, the dissolution of the anode in the cryolite-alumina melt produced small aluminium contamination(ca. 0.2%, mass fraction).

关键词: Inert anode, Aluminium electrolysis, Polarization, Voltammetry

Abstract:

This study deals with SnO2-based ceramic anodes doped with Sb2O3 and CuO, aiming at contributing new data regarding their electrochemical behavior in cryolite melts. The performances of the anodes were evaluated by anodic polarization, cyclic voltammetry, and current efficiency and corrosion measurements. The investigation proves that the anodic process of SnO2-based inert anodes occurs at a low overvoltage and the oxygen discharge takes place in one step with an exchange of two electrons. The current efficiency and corrosion were proved to be dependent on the electrolysis parameters and composition of electrolysis bath. For a long term electrolysis, the dissolution of the anode in the cryolite-alumina melt produced small aluminium contamination(ca. 0.2%, mass fraction).

Key words: Inert anode, Aluminium electrolysis, Polarization, Voltammetry