Selective electrocatalysis of ammonia oxidation on Pt(1 0 0) sites in alkaline medium
Selective electrocatalysis of ammonia oxidation on Pt(1 0 0) sites in alkaline medium
The oxidation of ammonia on platinum surfaces is a sensitive-structure reaction that takes place almost exclusively on Pt containing (100) sites. However it is strongly inhibited on Pt(111) and Pt(110) surfaces. A study using stepped electrodes with Pt(100) terraces and monoatomic Pt(111) steps, Pt(S)[n(100)x(111)], Miller indices Pt(2[n1,1,1)], shows that the activity of the electrode is strongly dependent on the terrace width, i.e., the wider the terrace the less positive the peak potential for ammonia oxidation. The change in the peak potential from the widest (100) terraces to terraces 6 atoms wide, i.e., from Pt(100) to Pt(11,1,1), is approximately 60 mV. This result is unexpected if we bear in mind the size and geometry of the ammonia molecule.
Ammonia electro-oxidation, electrocatalysis, platinum single crystal, platinum stepped surfaces, structure sensitive reaction
22-26
Vidal-Iglesias, F.J.
8b700d89-7066-4acd-a0e3-1e4f4c64c61f
Garcia-Araez, N.
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Montiel, V.
f3ccc832-95a5-4d32-82ba-b8bf5325fcd6
Feliu, J.M.
7768e11c-c05d-447d-a38d-f939c1fb4bab
Aldaz, A.
25de7288-96f9-48ab-b2ea-fad93590bf37
January 2003
Vidal-Iglesias, F.J.
8b700d89-7066-4acd-a0e3-1e4f4c64c61f
Garcia-Araez, N.
9358a0f9-309c-495e-b6bf-da985ad81c37
Montiel, V.
f3ccc832-95a5-4d32-82ba-b8bf5325fcd6
Feliu, J.M.
7768e11c-c05d-447d-a38d-f939c1fb4bab
Aldaz, A.
25de7288-96f9-48ab-b2ea-fad93590bf37
Vidal-Iglesias, F.J., Garcia-Araez, N., Montiel, V., Feliu, J.M. and Aldaz, A.
(2003)
Selective electrocatalysis of ammonia oxidation on Pt(1 0 0) sites in alkaline medium.
Electrochemistry Communications, 5 (1), .
(doi:10.1016/S1388-2481(02)00521-0).
Abstract
The oxidation of ammonia on platinum surfaces is a sensitive-structure reaction that takes place almost exclusively on Pt containing (100) sites. However it is strongly inhibited on Pt(111) and Pt(110) surfaces. A study using stepped electrodes with Pt(100) terraces and monoatomic Pt(111) steps, Pt(S)[n(100)x(111)], Miller indices Pt(2[n1,1,1)], shows that the activity of the electrode is strongly dependent on the terrace width, i.e., the wider the terrace the less positive the peak potential for ammonia oxidation. The change in the peak potential from the widest (100) terraces to terraces 6 atoms wide, i.e., from Pt(100) to Pt(11,1,1), is approximately 60 mV. This result is unexpected if we bear in mind the size and geometry of the ammonia molecule.
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Published date: January 2003
Keywords:
Ammonia electro-oxidation, electrocatalysis, platinum single crystal, platinum stepped surfaces, structure sensitive reaction
Organisations:
Electrochemistry
Identifiers
Local EPrints ID: 345222
URI: http://eprints.soton.ac.uk/id/eprint/345222
ISSN: 1388-2481
PURE UUID: 1b89db14-b206-4faa-bf5c-725d992395a8
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Date deposited: 12 Feb 2013 14:56
Last modified: 15 Mar 2024 03:46
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Contributors
Author:
F.J. Vidal-Iglesias
Author:
V. Montiel
Author:
J.M. Feliu
Author:
A. Aldaz
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