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The effect of surfactants on the kinetics of borohydride oxidation and hydrolysis in the DBFC

The effect of surfactants on the kinetics of borohydride oxidation and hydrolysis in the DBFC
The effect of surfactants on the kinetics of borohydride oxidation and hydrolysis in the DBFC
The kinetics of borohydride oxidation at gold in the presence of surfactants was analysed by cyclic voltammetry at a static disc and linear sweep voltammetry at a rotating disc electrode. The electrolytes contained 0.02 mol dm-3 NaBH4 in 3 mol dm-3 NaOH, at 23ºC, in the absence and in the presence of surfactants including alkoxylated ether non-ionic Triton X-100, sodium dodecyl sulphate (SDS) and FC4430. A rotating disc gold electrode of 0.125 cm2 geometrical area was used. Through these techniques, the value of the diffusion coefficient of the borohydride ion was found to be 0.98 × 10-5cm2s-1 and (0.33–1.63) × 10-5cm2s-1 in the absence and in the presence of surfactants, respectively. The presence of Triton X-100, and FC4430 surfactants inhibited borohydride oxidation while SDS increased the current density at concentrations lower than 0.001 wt. %. As promising results were obtained in the presence of SDS, the kinetic parameters such as the heterogeneous rate constant (at various potentials), the standard rate constant and the charge transfer coefficient were calculated in the presence of this surfactant at different concentrations.
0013-4686
539-545
Merino Jimenez, Irene
b7e7de25-13c8-4475-b98f-ceffe060e32a
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Merino Jimenez, Irene
b7e7de25-13c8-4475-b98f-ceffe060e32a
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2

Merino Jimenez, Irene, Ponce de Leon, Carlos and Walsh, F.C. (2014) The effect of surfactants on the kinetics of borohydride oxidation and hydrolysis in the DBFC. Electrochimica Acta, 133, 539-545. (doi:10.1016/j.electacta.2014.04.061).

Record type: Article

Abstract

The kinetics of borohydride oxidation at gold in the presence of surfactants was analysed by cyclic voltammetry at a static disc and linear sweep voltammetry at a rotating disc electrode. The electrolytes contained 0.02 mol dm-3 NaBH4 in 3 mol dm-3 NaOH, at 23ºC, in the absence and in the presence of surfactants including alkoxylated ether non-ionic Triton X-100, sodium dodecyl sulphate (SDS) and FC4430. A rotating disc gold electrode of 0.125 cm2 geometrical area was used. Through these techniques, the value of the diffusion coefficient of the borohydride ion was found to be 0.98 × 10-5cm2s-1 and (0.33–1.63) × 10-5cm2s-1 in the absence and in the presence of surfactants, respectively. The presence of Triton X-100, and FC4430 surfactants inhibited borohydride oxidation while SDS increased the current density at concentrations lower than 0.001 wt. %. As promising results were obtained in the presence of SDS, the kinetic parameters such as the heterogeneous rate constant (at various potentials), the standard rate constant and the charge transfer coefficient were calculated in the presence of this surfactant at different concentrations.

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Published date: 1 July 2014
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 364890
URI: http://eprints.soton.ac.uk/id/eprint/364890
ISSN: 0013-4686
PURE UUID: 95cc172a-8106-472a-8e42-c1c782b7a1ee
ORCID for Carlos Ponce de Leon: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 16 May 2014 07:59
Last modified: 03 Dec 2019 01:47

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