Electrochemical studies of decamethylferrocene in supercritical carbon dioxide mixtures
Electrochemical studies of decamethylferrocene in supercritical carbon dioxide mixtures
Detailed analysis of the voltammetry of decamethylferrocene at micro and macrodisc electrodes has been carried out in scCO2/MeCN (15 wt%), 20 mM [NBun4][BF4] and 309 K and 17.5 MPa. A passivating film needs to be removed from platinum electrodes before stable, reproducible voltammetry can be obtained. At low concentrations (0.22 mM) reversible 1e? behaviour is observed. Significant effects from natural convection are also present and it is demonstrated that fitting a baffle to the electrode dampens this effect. Limiting currents at microdisc electrodes at concentrations ranging from 0.22 to 11 mM and radii of 10 to 25 ?m all obey the microdisc equation. The diffusion coefficient is calculated to be 4.06 × 10?5 cm2 s?1 in scCO2/MeCN (15 wt%) with 20 mM [NBun4][BF4] and 309 K at 17.5 MPa. The solubility of decamethylferrocene is in excess of 11 mM for these conditions.
261-267
Branch, Jack A.
742797a7-a590-4bdd-b8f2-7310f0f58181
Cook, David A.
0fca0ffb-eef4-422f-b513-ce9a1f7de7cc
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
7 January 2015
Branch, Jack A.
742797a7-a590-4bdd-b8f2-7310f0f58181
Cook, David A.
0fca0ffb-eef4-422f-b513-ce9a1f7de7cc
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Branch, Jack A., Cook, David A. and Bartlett, Philip N.
(2015)
Electrochemical studies of decamethylferrocene in supercritical carbon dioxide mixtures.
Physical Chemistry Chemical Physics, 17 (1), .
(doi:10.1039/C4CP04545A).
Abstract
Detailed analysis of the voltammetry of decamethylferrocene at micro and macrodisc electrodes has been carried out in scCO2/MeCN (15 wt%), 20 mM [NBun4][BF4] and 309 K and 17.5 MPa. A passivating film needs to be removed from platinum electrodes before stable, reproducible voltammetry can be obtained. At low concentrations (0.22 mM) reversible 1e? behaviour is observed. Significant effects from natural convection are also present and it is demonstrated that fitting a baffle to the electrode dampens this effect. Limiting currents at microdisc electrodes at concentrations ranging from 0.22 to 11 mM and radii of 10 to 25 ?m all obey the microdisc equation. The diffusion coefficient is calculated to be 4.06 × 10?5 cm2 s?1 in scCO2/MeCN (15 wt%) with 20 mM [NBun4][BF4] and 309 K at 17.5 MPa. The solubility of decamethylferrocene is in excess of 11 mM for these conditions.
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Accepted/In Press date: 7 November 2014
e-pub ahead of print date: 12 November 2014
Published date: 7 January 2015
Organisations:
Electrochemistry
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Local EPrints ID: 376459
URI: http://eprints.soton.ac.uk/id/eprint/376459
ISSN: 1463-9076
PURE UUID: cd6e39dc-5c3d-4956-9a03-e1d4926d8e8d
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Date deposited: 28 Apr 2015 14:11
Last modified: 15 Mar 2024 02:44
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Author:
Jack A. Branch
Author:
David A. Cook
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