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Characterisation of platinum electrodeposits on a titanium micromesh stack in a rectangular channel flow cell

Characterisation of platinum electrodeposits on a titanium micromesh stack in a rectangular channel flow cell
Characterisation of platinum electrodeposits on a titanium micromesh stack in a rectangular channel flow cell
Pla­tinised ti­ta­nium mesh is a com­mon elec­trode ma­te­r­ial in in­dus­trial elec­trolytic cells and Ce-based re­dox flow bat­ter­ies. In this work, the elec­trode­po­si­tion of plat­inum on a stack of ti­ta­nium mi­cro­meshes is per­formed from a flow­ing al­ka­line so­lu­tion in a rec­tan­gu­lar chan­nel, di­vided flow cell. The mor­phol­ogy and dis­tri­b­u­tion of the re­sult­ing plat­inum de­posits are stud­ied by SEM, EDS map­ping and X-ray com­puted to­mog­ra­phy. The ac­tive sur­face area of the elec­trode was as­sessed from the charge trans­fer cur­rent for the re­duc­tion of Ce(IV) ions and com­pared to that of pla­nar and ex­panded metal mesh elec­trodes. The sur­face area was es­ti­mated by hy­dro­gen elec­trosorp­tion rel­a­tive to that at a pla­nar Pt/​Ti elec­trode. As ex­pected from the po­ten­tial drop within the elec­trode chan­nel, the in­di­vid­ual mi­cro­mesh near the cell sep­a­ra­tor dis­played a higher plat­inum con­tent. Pt/​Ti mi­cro­mesh of­fers an ex­tended sur­face area and en­hanced mass trans­port com­pared to pla­nar elec­trodes and con­ven­tional ex­panded metal mesh an­odes. The ap­pli­ca­tions for these and al­ter­na­tive elec­trode struc­tures are dis­cussed.
electroplating, Electrodeposition, Platinum, titanium, mesh, porous electrode, flow cell, electrochemical reactor, redox flow batteries, Fuel cell, parallel plate cells, parallel plate geometry, flow-by reactor, potential drop, potential distribution
0013-4686
994-1005
Arenas, Luis F.
3fcf929f-9d74-4e8a-99b0-09105d2ec269
Ponce De Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Boardman, Richard P.
5818d677-5732-4e8a-a342-7164dbb10df1
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2
Arenas, Luis F., Ponce De Leon, Carlos, Boardman, Richard P. and Walsh, Frank C. (2017) Characterisation of platinum electrodeposits on a titanium micromesh stack in a rectangular channel flow cell Electrochimica Acta, 247, pp. 994-1005. (10.​1016/​j.​electacta.​2017.​07.​029).

Arenas, Luis F., Ponce De Leon, Carlos, Boardman, Richard P. and Walsh, Frank C. (2017) Characterisation of platinum electrodeposits on a titanium micromesh stack in a rectangular channel flow cell Electrochimica Acta, 247, pp. 994-1005. (10.​1016/​j.​electacta.​2017.​07.​029).

Record type: Article

Abstract

Pla­tinised ti­ta­nium mesh is a com­mon elec­trode ma­te­r­ial in in­dus­trial elec­trolytic cells and Ce-based re­dox flow bat­ter­ies. In this work, the elec­trode­po­si­tion of plat­inum on a stack of ti­ta­nium mi­cro­meshes is per­formed from a flow­ing al­ka­line so­lu­tion in a rec­tan­gu­lar chan­nel, di­vided flow cell. The mor­phol­ogy and dis­tri­b­u­tion of the re­sult­ing plat­inum de­posits are stud­ied by SEM, EDS map­ping and X-ray com­puted to­mog­ra­phy. The ac­tive sur­face area of the elec­trode was as­sessed from the charge trans­fer cur­rent for the re­duc­tion of Ce(IV) ions and com­pared to that of pla­nar and ex­panded metal mesh elec­trodes. The sur­face area was es­ti­mated by hy­dro­gen elec­trosorp­tion rel­a­tive to that at a pla­nar Pt/​Ti elec­trode. As ex­pected from the po­ten­tial drop within the elec­trode chan­nel, the in­di­vid­ual mi­cro­mesh near the cell sep­a­ra­tor dis­played a higher plat­inum con­tent. Pt/​Ti mi­cro­mesh of­fers an ex­tended sur­face area and en­hanced mass trans­port com­pared to pla­nar elec­trodes and con­ven­tional ex­panded metal mesh an­odes. The ap­pli­ca­tions for these and al­ter­na­tive elec­trode struc­tures are dis­cussed.

Text Arenas et al Pt-Ti micromesh 2 July 2017 PURE - Accepted Manuscript
Restricted to Repository staff only until 8 July 2018.

More information

Accepted/In Press date: 5 July 2017
e-pub ahead of print date: 8 July 2017
Published date: 1 September 2017
Keywords: electroplating, Electrodeposition, Platinum, titanium, mesh, porous electrode, flow cell, electrochemical reactor, redox flow batteries, Fuel cell, parallel plate cells, parallel plate geometry, flow-by reactor, potential drop, potential distribution

Identifiers

Local EPrints ID: 412181
URI: http://eprints.soton.ac.uk/id/eprint/412181
DOI: 10.​1016/​j.​electacta.​2017.​07.​029
ISSN: 0013-4686
PURE UUID: 586acee3-6221-4228-be30-c1c1a3b6d0a8
ORCID for Luis F. Arenas: ORCID iD orcid.org/0000-0002-9579-5082

Catalogue record

Date deposited: 13 Jul 2017 16:31
Last modified: 12 Oct 2017 16:32

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