dc.contributor.author
Assaud, Loïc
dc.contributor.author
Schumacher, Johannes
dc.contributor.author
Tafel, Alexander
dc.contributor.author
Bochmann, Sebastian
dc.contributor.author
Christiansen, Silke
dc.contributor.author
Bachmann, Julien
dc.date.accessioned
2018-06-08T04:07:02Z
dc.date.available
2015-10-01T05:21:54.681Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/16602
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-20783
dc.description.abstract
We establish a procedure for the fabrication of electrocatalytically active,
nanoporous surfaces coated with Pt and exhibiting a high geometric area.
Firstly, the mechanism of the surface reactions between platinum(II)
acetylacetonate and ozone is investigated by piezoelectric microbalance
measurements. The data reveal that ozone oxidizes the metallic Pt surface to
an extent which can exceed one monolayer depending on the reaction conditions.
Proper reaction parameters yield a self-limited growth in atomic layer
deposition (ALD) mode. Secondly, the ALD procedure is applied to porous anodic
oxide substrates. The morphology and the crystal structure of the deposits are
characterized. The ALD coating results in a continuous layer of Pt
nanocrystallites along deep pore walls (aspect ratio 70). Thirdly, the Pt/TiO2
surfaces are shown to be electrochemically active in both acidic and alkaline
media, in a way that qualitatively conforms to literature precedents based on
Pt. Finally, we apply the anodization and ALD procedure to commercial Ti felts
and demonstrate systematically how the electrochemical current density is
increased by the large specific surface area and by the presence of the
catalyst. Thereby, the catalyst loading, as well as its efficient utilization,
can be optimized accurately. The preparative approach demonstrated here can be
generalized and applied to the various electrocatalytic reactions of energy
conversion devices.
en
dc.rights.uri
http://creativecommons.org/licenses/by-nc/3.0/
dc.subject.ddc
500 Naturwissenschaften und Mathematik::540 Chemie
dc.title
Systematic increase of electrocatalytic turnover at nanoporous platinum
surfaces prepared by atomic layer deposition
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation
Journal of materials chemistry A. - 3 (2015), 16, S. 8450-8458
dc.identifier.sepid
46113
dcterms.bibliographicCitation.doi
10.1039/C5TA00205B
dcterms.bibliographicCitation.url
http://dx.doi.org/10.1039/C5TA00205B
refubium.affiliation
Physik
de
refubium.affiliation.other
Institut für Experimentalphysik
refubium.mycore.fudocsId
FUDOCS_document_000000023198
refubium.resourceType.isindependentpub
no
refubium.mycore.derivateId
FUDOCS_derivate_000000005466
dcterms.accessRights.openaire
open access
dcterms.isPartOf.issn
2050-7488