Processes at platinum electrodes during the cathode polarization in alcohol erbium nitrate solution

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The processes at platinum electrodes during the cathode polarization in an alcohol solution of erbium nitrate are discussed. The current density maxima on the cathode branch of voltammograms were found to correspond to the potentials of the hydrogen reduction reactions. The gel-like deposit Er(OH)x(NO3)y(С2Н5О)z · nH2O, x + y + z = 3, formed during the cathode treatment was shown to be not a product of the electron exchange between the cathode and the solution components. The following formation mechanism of the erbium-containing deposit has been suggested. First, the electrochemical process of the hydrogen cathode reduction is implemented. This process leads to the ionic unbalance and causes the alkalinization of the cathode space. This creates conditions for the chemical process of the gel-like erbium hydroxide formation, which is physically adsorbed on the cathode surface as a precipitate.

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作者简介

S. Volchek

Belarusian State University of Informatics and Radioelectronics

编辑信件的主要联系方式.
Email: volchek@bsuir.by
白俄罗斯, Minsk

V. Yakovtseva

Belarusian State University of Informatics and Radioelectronics

Email: yakovtseva@yahoo.com
白俄罗斯, Minsk

参考

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2. Fig. 1. Design of an electrochemical cell for studying cathode processes on platinum electrodes: 1 – working electrode (cathode), 2 – reference electrode, 3 – auxiliary electrode (anode), 4 – glass beaker.

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3. Fig. 2. Voltamgram with linear potential sweep in the case of reversible charge transfer.

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4. Fig. 3. Time dependence of the potential of a platinum electrode in a 0.1 M alcohol solution of Er(NO₃)₃ without applying an external potential.

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5. Fig. 4. Voltamgram of a platinum electrode in a 0.1 M alcohol solution of Er(NO₃)₃.

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6. Fig. 5. Cyclic voltammograms of a platinum electrode in a 0.1 M alcohol solution of Er(NO₃)₃, recorded in the range from +400 to –800 mV at different potential scan rates.

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7. Fig. 6. SIMS distribution profiles of elements in erbium-containing film.

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