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Mössbauerite as Iron-Only Layered Oxyhydroxide Catalyst for WO₃ Photoanodes

Title data

Ertl, Michael ; Ma, Zili ; Thersleff, Thomas ; Lyu, Pengbo ; Hüttner, Sven ; Nachtigall, Petr ; Breu, Josef ; Slabon, Adam:
Mössbauerite as Iron-Only Layered Oxyhydroxide Catalyst for WO₃ Photoanodes.
In: Inorganic Chemistry. Vol. 58 (2019) Issue 15 . - pp. 9655-9662.
ISSN 1520-510X
DOI: https://doi.org/10.1021/acs.inorgchem.9b00327

Project information

Project financing: Hanns-Seidel-Stiftung

Abstract in another language

Mossbauerite, a trivalent iron-only layered oxyhydroxide, has been recently identified as an electrocatalyst for water oxidation. We investigated the material as potential cocatalyst for photoelectrochemical water oxidation on semiconductor photoanodes. The band edge positions of mossbauerite were determined for the first time with a combination of Mott-Schottky analysis and UV-vis diffuse reflectance spectroscopy. The positive value of the Mott-Schottky slope and the flatband potential of 0.34 V vs reversible hydrogen electrode (RHE) identifies the material as an n-type semiconductor, but bare mossbauerite does not produce noticeable photocurrent during water oxidation. Type-II heterojunction formation by facile drop-casting with WO3 thin films yielded photoanodes with amended charge carrier separation and photocurrents up to 1.22 mA cm(-2) at 1.23 V vs RHE. Mossbauerite is capable of increasing the charge carrier separation at lower potential and improving the photocurrent during photoelectrochemical water oxidation. The rise in photocurrent of the mossbauerite-functionalized WO3 photoanode thus originates from improved charge carrier separation and augmented hole collection efficiency. Our results highlight the potential of mossbauerite as a second-phase catalyst for semiconductor electrodes.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: hole-storage layer; green rust; nanowire photoanode; CUWO4 photoanodes; XPS spectra; water; ferihydrite; oxygen; efficiency; FE
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I > Chair Inorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 03 Dec 2019 07:29
Last Modified: 03 Dec 2019 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/53436