Kinetics and mechanism of nitrate and nitrite electroreduction on Pt(100) electrodes modified by copper adatoms

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Title: Kinetics and mechanism of nitrate and nitrite electroreduction on Pt(100) electrodes modified by copper adatoms
Authors: Molodkina, E.B. | Botryakova, I.G. | Danilov, A.I. | Souza-Garcia, Janaina | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Pt(100) | Modified electrodes | Copper | Nitrate | Nitrite
Knowledge Area: Química Física
Issue Date: Mar-2013
Publisher: Pleiades Publishing
Citation: Russian Journal of Electrochemistry. 2013, 49(3): 285-293. doi:10.1134/S1023193513030105
Abstract: Kinetics and mechanism of nitrate and nitrite reduction on Pt(100) electrode modified by Cu adatoms have been studied in solutions of sulfuric and perchloric acids by means of cyclic voltammetry and in situ IR-spectroscopy. It has been shown that the surface redox process with participation of ammonia or hydroxylamine at 0.5–0.9 V occurs only on the Cu-free platinum. The causes of this effect could be low adsorption energy of nitrate reduction products on copper or changes in the composition of the products (ammonia for Pt(100) and N2O for Pt(100)+Cu). Nitrate reduction on Pt(100)+Cu electrode is much faster in the perchloric acid solution (by several orders of magnitude) as compared with unmodified platinum as a result of induced adsorption of nitrate anions in the presence of partly charged Cu atoms. In the solutions of sulfuric acid the rate of nitrate reduction is considerably lower as copper adatoms facilitate adsorption of sulfate anions, which block the adsorption sites for the nitrate.
Sponsor: The work was financially supported by the Russian Foundation for Basic Research (project no. 10-03-00427). Financial support from MICINN (CTR2010-1624) (Feder) and Generalitat Valenciana (Prometeo/2009/045) (Feder) is gratefully acknowledged.
ISSN: 1023-1935 (Print) | 1608-3342 (Online)
DOI: 10.1134/S1023193513030105
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Pleiades Publishing, Ltd. 2013
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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