A significant cathodic shift in the onset potential of photoelectrochemical water splitting for hematite nanostructures grown from Fe-Si alloys

Journal article


Publication Details

Author(s): Wang L, Lee CY, Kirchgeorg R, Hildebrand H, Müller J, Spiecker E, Schmuki P
Journal: Materials Horizons
Publication year: 2014
Volume: 1
Journal issue: 3
Pages range: 344-347
ISSN: 2051-6347


Abstract


Thermal oxidation of Fe to nanostructured hematite (wires, flakes) is currently widely investigated to produce efficient photoanodes for photoelectrochemical water splitting. The process carried out on pure iron, however, has the key drawback that not only hematite but a layered structure of Fe2O3-Fe3O4-FeO is formed where the thick suboxide layer underneath the Fe2O3 is highly detrimental to the photoresponse. In the present work, we show that suboxide formation can be largely suppressed if hematite nanowires/nanoflakes are thermally grown on Fe-Si alloys. For hematite structures grown on a Fe-Si alloy with 5 at% Si, a photocurrent onset potential as low as 0.6 V-RHE can be reached (under AM 1.5 illumination and 1 M KOH). We believe that the results represent a key finding towards the formation of optimized hematite nanostructures using a thermal oxidation method.



FAU Authors / FAU Editors

Kirchgeorg, Robin
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Lee, Chong-Yong
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Müller, Julian Dr.-Ing.
Sonderforschungsbereich/Transregio 103 Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen
Schmuki, Patrik Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Wang, Lei
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)


Additional Organisation
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)
Exzellenz-Cluster Engineering of Advanced Materials


Research Fields

D Catalytic Materials
Exzellenz-Cluster Engineering of Advanced Materials
A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Wang, L., Lee, C.-Y., Kirchgeorg, R., Hildebrand, H., Müller, J., Spiecker, E., & Schmuki, P. (2014). A significant cathodic shift in the onset potential of photoelectrochemical water splitting for hematite nanostructures grown from Fe-Si alloys. Materials Horizons, 1(3), 344-347. https://dx.doi.org/10.1039/c3mh00173c

MLA:
Wang, Lei, et al. "A significant cathodic shift in the onset potential of photoelectrochemical water splitting for hematite nanostructures grown from Fe-Si alloys." Materials Horizons 1.3 (2014): 344-347.

BibTeX: 

Last updated on 2018-07-08 at 03:03