Nitrate reduction at Pt(1 0 0) single crystals and preferentially oriented nanoparticles in neutral media
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http://hdl.handle.net/10045/38743
Title: | Nitrate reduction at Pt(1 0 0) single crystals and preferentially oriented nanoparticles in neutral media |
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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. |
URI: | http://hdl.handle.net/10045/38743 |
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: | http://dx.doi.org/10.1016/j.cattod.2012.02.038 |
Appears in Collections: | INV - EQSUP - Artículos de Revistas INV - LEQA - Artículos de Revistas |
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2013_Figueiredo_etal_CatTod_final.pdf | Versión final (acceso restringido) | 823,71 kB | Adobe PDF | Open Request a copy |
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