Systematic increase of electrocatalytic turnover at nanoporous platinum surfaces prepared by atomic layer deposition

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Assaud L, Schumacher J, Tafel A, Bochmann S, Christiansen S, Bachmann J
Zeitschrift: Journal of Materials Chemistry A
Jahr der Veröffentlichung: 2015
Band: 3
Seitenbereich: 8450-8458
ISSN: 2050-7488


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.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Assaud, Loic
Tafel, Alexander
Lehrstuhl für Anorganische und Allgemeine Chemie
Lehrstuhl für Anorganische und Allgemeine Chemie
Bachmann, Julien Prof.
Lehrstuhl für Chemistry of thin film materials
Bochmann, Sebastian Dr.
Lehrstuhl für Anorganische und Allgemeine Chemie


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Einrichtungen weiterer Autorinnen und Autoren

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light


Forschungsbereiche

B Nanoelectronic Materials
Exzellenz-Cluster Engineering of Advanced Materials
C Photonic and Optical Materials
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Assaud, L., Schumacher, J., Tafel, A., Bochmann, S., Christiansen, S., & Bachmann, J. (2015). Systematic increase of electrocatalytic turnover at nanoporous platinum surfaces prepared by atomic layer deposition. Journal of Materials Chemistry A, 3, 8450-8458. https://dx.doi.org/10.1039/c5ta00205b

MLA:
Assaud, Loic, et al. "Systematic increase of electrocatalytic turnover at nanoporous platinum surfaces prepared by atomic layer deposition." Journal of Materials Chemistry A 3 (2015): 8450-8458.

BibTeX: 

Zuletzt aktualisiert 2019-15-03 um 09:48