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Oxidation of the borohydride Ion at silver nanoparticles on a glassy carbon electrode (GCE) using pulsed potential techniques

Oxidation of the borohydride Ion at silver nanoparticles on a glassy carbon electrode (GCE) using pulsed potential techniques
Oxidation of the borohydride Ion at silver nanoparticles on a glassy carbon electrode (GCE) using pulsed potential techniques
Direct oxidation borohydride fuel cells are very attractive energy conversion devices. Silver has been reported as one of the few materials which can catalyze an 8-electron oxidation. Potential step amperometric pulse techniques to synthesize nanostructured silver material on flat glassy carbon electrodes is reported and significant differences with bulk silver deposit have been observed. The oxidation of borohydride ion on the silver particles occurs at -0.025 V vs. SCE and the potential decreases towards negative values at longer cycle times. The oxidation current also decreases with the number of cycles, suggesting that the silver active sites become partially blocked by oxidation products of borohydride. The electroactive area per unit electrode area of silver was relatively low for particles deposited using potential step amperometric techniques on glassy carbon (0.002 cm2 per cm-2) compared with the area found at a polycrystalline silver electrode (0.103 cm2 per cm-2)
borohydride, energy generation, silver electrodes
1938-5862
211-225
Hernández-Ramírez, V.A
0da54b13-18fe-4bda-a618-8978703d0dc8
Alatorre-Ordaz, A
4bdbe504-3ab9-4949-b2d4-60b36ed67345
Yepez-Murrieta, M.L.
80edaa6a-0beb-4db2-a645-04799104c8e3
Ibanez, J.G.
f60a1d13-9e3f-431d-913a-cc5215e6810e
Ponce de Leon, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C
309528e7-062e-439b-af40-9309bc91efb2
Hernández-Ramírez, V.A
0da54b13-18fe-4bda-a618-8978703d0dc8
Alatorre-Ordaz, A
4bdbe504-3ab9-4949-b2d4-60b36ed67345
Yepez-Murrieta, M.L.
80edaa6a-0beb-4db2-a645-04799104c8e3
Ibanez, J.G.
f60a1d13-9e3f-431d-913a-cc5215e6810e
Ponce de Leon, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C
309528e7-062e-439b-af40-9309bc91efb2

Hernández-Ramírez, V.A, Alatorre-Ordaz, A, Yepez-Murrieta, M.L., Ibanez, J.G., Ponce de Leon, C. and Walsh, F.C (2009) Oxidation of the borohydride Ion at silver nanoparticles on a glassy carbon electrode (GCE) using pulsed potential techniques. ECS Transactions, 20 (1), 211-225. (doi:10.1149/1.3268389).

Record type: Article

Abstract

Direct oxidation borohydride fuel cells are very attractive energy conversion devices. Silver has been reported as one of the few materials which can catalyze an 8-electron oxidation. Potential step amperometric pulse techniques to synthesize nanostructured silver material on flat glassy carbon electrodes is reported and significant differences with bulk silver deposit have been observed. The oxidation of borohydride ion on the silver particles occurs at -0.025 V vs. SCE and the potential decreases towards negative values at longer cycle times. The oxidation current also decreases with the number of cycles, suggesting that the silver active sites become partially blocked by oxidation products of borohydride. The electroactive area per unit electrode area of silver was relatively low for particles deposited using potential step amperometric techniques on glassy carbon (0.002 cm2 per cm-2) compared with the area found at a polycrystalline silver electrode (0.103 cm2 per cm-2)

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More information

Published date: 5 June 2009
Keywords: borohydride, energy generation, silver electrodes
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 69892
URI: https://eprints.soton.ac.uk/id/eprint/69892
ISSN: 1938-5862
PURE UUID: a632bc23-e571-44ad-bf9d-8b5a88571004
ORCID for C. Ponce de Leon: ORCID iD orcid.org/0000-0002-1907-5913

Catalogue record

Date deposited: 09 Dec 2009
Last modified: 06 Jun 2018 12:42

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