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


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. Electrochemical Transactions. The Electrochemical Society, 20, (1), 211-225. (doi:10.1149/1.3268389).

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Original Publication URL: http://dx.doi.org/10.1149/1.3268389

Description/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)

Item Type: Article
ISSNs: 1938-5862 (print)
Related URLs:
Keywords: borohydride, energy generation, silver electrodes
Subjects: T Technology > TP Chemical technology
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 69892
Date Deposited: 09 Dec 2009
Last Modified: 27 Mar 2014 18:49
URI: http://eprints.soton.ac.uk/id/eprint/69892

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