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Mössbauerite as Iron-Only Layered Oxyhydroxide Catalyst for WO₃ Photoanodes

Titelangaben

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. Bd. 58 (2019) Heft 15 . - S. 9655-9662.
ISSN 1520-510X
DOI: https://doi.org/10.1021/acs.inorgchem.9b00327

Angaben zu Projekten

Projektfinanzierung: Hanns-Seidel-Stiftung

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: hole-storage layer; green rust; nanowire photoanode; CUWO4 photoanodes; XPS spectra; water; ferihydrite; oxygen; efficiency; FE
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I > Lehrstuhl Anorganische Chemie I - Univ.-Prof. Dr. Josef Breu
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 03 Dec 2019 07:29
Letzte Änderung: 03 Dec 2019 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/53436