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On the kinetics of the hydrogen evolution reaction on zinc in sulfate solutions

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2001
0352-51390112811T.pdf (134.1Kb)
Аутори
Trišović, Tomislav
Gajić Krstajić, Ljiljana
Krstajić, Nedeljko
Vojnović, Milan
Чланак у часопису (Објављена верзија)
Метаподаци
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Апстракт
The kinetics and mechanism of the hydrogen evolution reaction (her) were studied on zinc in 1.0 mol dm-3 Na2SO4 at 298 K, in the pH range 4.4 - 10. It was found that a combination of classical potentiostatic steady-state voltammetry (PSV) and electrochemical impedance spectroscopy (EIS) can help to elucidate dilemmas concerning the mechanism of this reaction. Thus, over the whole potential region, the reaction path of the her on zinc cannot be presented by the classical Volmer-Tafel-Heyrovsky route. It was found that the very complex S-shape of the polarization curves could be explained by two parallel reaction mechanisms for the her. The first reaction mechanism is a consecutive combination of three steps, in which the surface zinc oxide plays an active role in the her, and second reaction mechanism is a consecutive combination of a Volmer step, followed by a Heyrovsky step. The second mechanism is dominant in the more negative potential region where the active sites for the her are m...etallic zinc.

Кључне речи:
hydrogen evolution reaction / zinc electrode / sulfate solution / spectroscopy of electrochemical impedance / mechanism / NLS fitting / rate constants
Извор:
Journal of the Serbian Chemical Society, 2001, 811-823
Издавач:
  • Belgrade : Serbian Chemical Society

ISSN: 0352-5139 (Print) 1820-7421 (Online)

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URI
http://dais.sanu.ac.rs/123456789/286
Колекције
  • ITN SANU - Opšta kolekcija
Институција
Институт техничких наука САНУ

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