Nitrate reduction at Pt(1 0 0) single crystals and preferentially oriented nanoparticles in neutral media

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Title: Nitrate reduction at Pt(1 0 0) single crystals and preferentially oriented nanoparticles in neutral media
Authors: Figueiredo, Marta C. | Solla-Gullón, José | Vidal-Iglesias, Francisco J. | Climent, Victor | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Platinum surfaces | Single crystals | Nitrate reduction | FTIRS | NO stripping | Neutral media | Phosphate buffer
Knowledge Area: Química Física
Issue Date: 15-Mar-2013
Publisher: Elsevier
Citation: Catalysis Today. 2013, 202: 2-11. doi:10.1016/j.cattod.2012.02.038
Abstract: The electroreduction of nitrate on Pt(1 0 0) electrodes in phosphate buffer neutral solution, pH 7.2, is reported. The sensitivity of the reaction to the crystallographic order of the surface is studied through the controlled introduction of defects by using stepped surfaces with (1 0 0) terraces of different length separated by monoatomic steps, either with (1 1 1) or (1 1 0) symmetry. The results of this study show that nitrate reduction occurs mainly on the well defined (1 0 0) terraces in the potential region where H adsorption starts to decrease, allowing the nitrate anion to access the surface. Adsorbed NO has been detected as a stable intermediate in this media. An oxidation process observed at 0.8 V has been identified as leading to the formation of adsorbed NO and being responsible for a secondary reduction process observed in the subsequent negative scan. Using in situ FTIRS, ammonium was found to be the main product of nitrate reduction. This species can be oxidized at high potentials resulting in adsorbed NO and nitrate (probably with nitrite as intermediate).
Sponsor: The work was carried out under financial support by the European Commission (through FP7 Initial Training Network “ELCAT”, Grant Agreement No. 214936–2). Partial support of Generalitat Valenciana (Feder) through PROMETEO/2009/045 project is also acknowledged. FJVI also thanks the European social funding.
ISSN: 0920-5861 (Print) | 1873-4308 (Online)
DOI: 10.1016/j.cattod.2012.02.038
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version:
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INV - LEQA - Artículos de Revistas

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