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A reference electrode for use in supercritical difluoromethane

A reference electrode for use in supercritical difluoromethane
A reference electrode for use in supercritical difluoromethane
We describe the assembly and characterisation of a reference electrode for use in supercritical difluoromethane (R32). The reference electrode is constructed from a europium doped lanthanum fluoride crystal contacted by silver loaded epoxy and encased in a silicate epoxy. The reference electrode can withstand pressures and temperatures up to at least 20 MPa and 360 K, typical operating condition for electrochemistry in supercritical difluoromethane (scR32). The performance of the new reference electrode is compared to that of a platinum pseudo reference electrode in scR32. The redox potential of the decamethylferrocene couple in scR32 containing 20 mM [NBun4][BF4] at ?17.6 MPa and 359 K was 0.088 ± 0.015 V against the new silver contacted lanthanum fluoride crystal based reference electrode.
supercritical fluid, difluoromethane, reference electrode, lanthanum fluoride
0013-4686
323-328
Cummings, Charles
37ed515b-eb09-4c6b-9c66-61013c8c132a
Branch, Jack
42ac8ec4-09f2-4cb7-b2c4-f81a73529e6d
Richardson, Peter
babd5d43-0ea3-4a27-b92f-820683acd781
Bartlett, Philip
d99446db-a59d-4f89-96eb-f64b5d8bb075
Cummings, Charles
37ed515b-eb09-4c6b-9c66-61013c8c132a
Branch, Jack
42ac8ec4-09f2-4cb7-b2c4-f81a73529e6d
Richardson, Peter
babd5d43-0ea3-4a27-b92f-820683acd781
Bartlett, Philip
d99446db-a59d-4f89-96eb-f64b5d8bb075

Cummings, Charles, Branch, Jack, Richardson, Peter and Bartlett, Philip (2016) A reference electrode for use in supercritical difluoromethane. Electrochimica Acta, 187, 323-328. (doi:10.1016/j.electacta.2015.11.060).

Record type: Article

Abstract

We describe the assembly and characterisation of a reference electrode for use in supercritical difluoromethane (R32). The reference electrode is constructed from a europium doped lanthanum fluoride crystal contacted by silver loaded epoxy and encased in a silicate epoxy. The reference electrode can withstand pressures and temperatures up to at least 20 MPa and 360 K, typical operating condition for electrochemistry in supercritical difluoromethane (scR32). The performance of the new reference electrode is compared to that of a platinum pseudo reference electrode in scR32. The redox potential of the decamethylferrocene couple in scR32 containing 20 mM [NBun4][BF4] at ?17.6 MPa and 359 K was 0.088 ± 0.015 V against the new silver contacted lanthanum fluoride crystal based reference electrode.

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Accepted/In Press date: 10 November 2015
e-pub ahead of print date: 1 December 2015
Published date: 1 January 2016
Keywords: supercritical fluid, difluoromethane, reference electrode, lanthanum fluoride
Organisations: Electrochemistry

Identifiers

Local EPrints ID: 385452
URI: http://eprints.soton.ac.uk/id/eprint/385452
ISSN: 0013-4686
PURE UUID: 212f432a-03ad-4943-bfcb-dedc7fcf8f68
ORCID for Philip Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

Catalogue record

Date deposited: 20 Jan 2016 09:19
Last modified: 15 Mar 2024 02:44

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Contributors

Author: Charles Cummings
Author: Jack Branch
Author: Peter Richardson
Author: Philip Bartlett ORCID iD

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