Indirect identification of Hads relaxation on different metals by electrochemical impedance spectroscopy
| Autor: | N. Amokrane, Claude Gabrielli, Ricardo P. Nogueira |
|---|---|
| Přispěvatelé: | Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de thermodynamique et physico-chimie métallurgiques (LTPCM), Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique de Grenoble (INPG) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Hydrogen
General Chemical Engineering Inorganic chemistry Analytical chemistry chemistry.chemical_element adsorbed hydrogen 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences modelling Metal chemistry.chemical_compound [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Chemistry [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy hydrogen evolution visual_art electrochemical impedance visual_art.visual_art_medium Reversible hydrogen electrode Ferricyanide 0210 nano-technology Platinum Palladium |
| Zdroj: | Electrochimica Acta Electrochimica Acta, Elsevier, 2007, 52, pp.4202-4209 Electrochimica Acta, 2007, 52 (12), pp. 4202-4209. ⟨10.1016/j.electacta.2006.11.032⟩ Electrochimica Acta, Elsevier, 2007, 52 (12), pp. 4202-4209. ⟨10.1016/j.electacta.2006.11.032⟩ |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2006.11.032⟩ |
| Popis: | International audience; For the hydrogen evolution reaction, the coverage rate of the electrode surface by adsorbed hydrogen is generally difficult to evidence especially in presence of bubbles. In the present paper, a parallel competing reaction was incorporated to the interface by the addition of ferricyanide to a NaOH solution. This reaction was supposed to take place on the free electrode surface and allowed the relaxation of adsorbed hydrogen to be identified. Models taking into account hydrogen evolution, hydrogen absorption, and ferricyanide reduction were proposed. Three metals were tested: platinum, iron, and palladium, which absorb hydrogen in very different quantities. In these conditions, low frequency loops related to the Hads surface coverage appeared in the electrochemical impedance diagrams, whose properties depend on the tested metal. Very good agreement was found between the experimental data and model predictions. |
| Databáze: | OpenAIRE |
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