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

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.

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Identifiers

ORCID for Carlos Ponce De Leon: orcid.org/0000-0002-1907-5913

ORCID for Richard P. Boardman: orcid.org/0000-0002-4008-0098

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