An analytical model of hydrogen evolution and oxidation reactions on electrodes partially covered with a catalyst

Simple item page
dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKemppainen, Erno
dc.contributor.authorHalme, Janne
dc.contributor.authorLund, Peter D.
dc.contributor.departmentTeknillisen fysiikan laitosfi
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.labNew Energy Technologies (Renewable)en
dc.contributor.schoolPerustieteiden korkeakoulufi
dc.contributor.schoolSchool of Scienceen
dc.date.accessioned2016-08-29T09:01:14Z
dc.date.available2016-08-29T09:01:14Z
dc.date.issued2016
dc.description.abstractOur previous theoretical study on the performance limits of the platinum (Pt) nanoparticle catalyst for the hydrogen evolution reaction (HER) had shown that the mass transport losses at a partially catalyst-covered planar electrode are independent of the catalyst loading. This suggests that the two-dimensional (2D) numerical model used could be simplified to a one-dimensional (1D) model to provide an easier but equally accurate description of the operation of these HER electrodes. In this article, we derive an analytical 1D model and show that it indeed gives results that are practically identical to the 2D numerical simulations. We discuss the general principles of the model and how it can be used to extend the applicability of existing electrochemical models of planar electrodes to low catalyst loadings suitable for operating photoelectrochemical devices under unconcentrated sunlight. Since the mass transport losses of the HER are often very sensitive to the H2 concentration, we also discuss the limiting current density of the hydrogen oxidation reaction (HOR) and how it is not necessarily independent of the reaction kinetics. The results give insight into the interplay of kinetic and mass-transport limitations at HER/HOR electrodes with implications for the design of kinetic experiments and the optimization of catalyst loadings in the photoelectrochemical cells.en
dc.description.versionPeer revieweden
dc.format.extent13616-13628
dc.format.mimetypeapplication/pdfen
dc.identifier.citationKemppainen, Erno & Halme, Janne & Lund, Peter D.. 2016. An analytical model of hydrogen evolution and oxidation reactions on electrodes partially covered with a catalyst. Physical Chemistry Chemical Physics. Volume 18, Issue 19. 13616-13628. ISSN 1463-9076 (printed). DOI: 10.1039/c6cp00908e.en
dc.identifier.doi10.1039/c6cp00908e
dc.identifier.issn1463-9076 (printed)
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/21683
dc.identifier.urnURN:NBN:fi:aalto-201607062840
dc.language.isoenen
dc.publisherRoyal Society of Chemistry (RSC)en
dc.relation.ispartofseriesPhysical Chemistry Chemical Physicsen
dc.relation.ispartofseriesVolume 18, Issue 19
dc.rights© 2016 Royal Society of Chemistry (RSC).en
dc.rights.holderRoyal Society of Chemistry (RSC)
dc.subject.keywordhydrogenen
dc.subject.keywordwateren
dc.subject.keywordhydrogen evolution reactionen
dc.subject.keywordhydrogen oxidation reactionen
dc.subject.keywordmass transporten
dc.subject.keywordplatinumen
dc.subject.keywordmodelingen
dc.subject.otherChemistryen
dc.subject.otherEnergyen
dc.subject.otherPhysicsen
dc.titleAn analytical model of hydrogen evolution and oxidation reactions on electrodes partially covered with a catalysten
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.dcmitypetexten
dc.type.versionFinal published versionen
Files
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
A1_kemppainen_erno_2016.pdf
Size:
1.31 MB
Format:
Adobe Portable Document Format
Download
Collections
[article] Perustieteiden korkeakoulu / SCI