Photoanodes with fully controllable texture: the enhanced water splitting efficiency of thin hematite films exhibiting solely (110) crystal orientation

0449088 - FZÚ 2016 RIV US eng J - Článek v odborném periodiku
Kment, Š. - Schmuki, P. - Hubička, Zdeněk - Machala, L. - Kirchgeorg, R. - Liu, N. - Wang, L. - Lee, K. - Olejníček, Jiří - Čada, Martin - Gregora, Ivan - Zbořil, R.
Photoanodes with fully controllable texture: the enhanced water splitting efficiency of thin hematite films exhibiting solely (110) crystal orientation.
ACS Nano. Roč. 9, č. 7 (2015), s. 7113-7123. ISSN 1936-0851. E-ISSN 1936-086X
Grant CEP: GA MŠMT LH12043
Institucionální podpora: RVO:68378271
Klíčová slova: hematite * iron oxide * texture * PEC water splitting * pulsed magnetron sputtering * conversion electron Mössbauer spectroscopy
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 13.334, rok: 2015

Hematite, R-Fe2O3, is considered as one of the most promising materials for sustainable hydrogen production via photoelectrochemical water splitting with a theoretical solar-to-hydrogen efficiency of 17%. However, the poor electrical conductivity of hematite is a substantial limitation reducing its efficiency in real experimental conditions. Despite of computing models suggesting that the electrical conductivity is extremely anisotropic, revealing up to 4 orders of magnitude higher electron transport with conduction along the (110) hematite crystal plane, synthetic approaches allowing the sole growth in that direction have not been reported yet. Here, we present a strategy for controlling the crystal orientation of very thin hematite films by adjusting energy of ion flux during advanced pulsed reactive magnetron sputtering technique. The texture and effect of the deposition mode on the film properties were monitored by XRD, conversion electron Mössbauer spectroscopy.
Trvalý link: http://hdl.handle.net/11104/0250672