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Bi-containing n-FeWO_4 Thin Films Provide the Largest Photovoltage and Highest Stability for a sub-2 eV Band Gap Photoanode

Zhou, Lan and Shinde, Aniketa and Suram, Santosh K. and Stein, Helge S. and Bauers, Sage R. and Zakutayev, Andriy and DuChene, Joseph S. and Liu, Guiji and Peterson, Elizabeth A. and Neaton, Jeffrey B. and Gregoire, John M. (2018) Bi-containing n-FeWO_4 Thin Films Provide the Largest Photovoltage and Highest Stability for a sub-2 eV Band Gap Photoanode. ACS Energy Letters, 3 (11). pp. 2769-2774. ISSN 2380-8195. http://resolver.caltech.edu/CaltechAUTHORS:20181017-090950761

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Abstract

Photoelectrocatalysis of the oxygen evolution reaction remains a primary challenge for development of tandem-absorber solar fuel generators due to the lack of a photoanode with broad solar spectrum utilization, a large photovoltage, and stable operation. Bismuth vanadate with a 2.4–2.5 eV band gap has shown the most promise becauses its photoactivity down to 0.4 V vs RHE is sufficiently low to couple to a lower-gap photocathode for fuel synthesis. Through development of photoanodes based on the FeWO_4 structure, in particular, Fe-rich variants with addition of about 6% Bi, we demonstrate the same 0.4 V vs RHE turn-on voltage with a 2 eV band gap metal oxide, enabling a 2-fold increase in the device efficiency limit. Combinatorial exploration of materials composition and processing facilitated synthesis of n-type variants of this typical p-type semiconductor that exhibit much higher photoactivity than previous implementations of FeWO_4 in solar photochemistry. The photoanodes are particularly promising for solar fuel applications given their stable operation in acid and base.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acsenergylett.8b01514DOIArticle
https://pubs.acs.org/doi/suppl/10.1021/acsenergylett.8b01514PublisherSupporting Information
ORCID:
AuthorORCID
Zhou, Lan0000-0002-7052-266X
Shinde, Aniketa0000-0003-2386-3848
Suram, Santosh K.0000-0001-8170-2685
Stein, Helge S.0000-0002-3461-0232
Zakutayev, Andriy0000-0002-3054-5525
DuChene, Joseph S.0000-0002-7145-323X
Neaton, Jeffrey B.0000-0001-7585-6135
Gregoire, John M.0000-0002-2863-5265
Alternate Title:Bi-containing n-FeWO4 Thin Films Provide the Largest Photovoltage and Highest Stability for a sub-2 eV Band Gap Photoanode
Additional Information:© 2018 American Chemical Society. Received: August 17, 2018; Accepted: October 12, 2018; Published: October 12, 2018. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. Computational work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. DOE under Contract DE-AC02-05CH11231. Seebeck and resistivity characterization were supported by the U.S. Department of Energy under Contract No. DE-AC36-08GO28308 with Alliance for Sustainable Energy, LLC, the Manager and Operator of the National Renewable Energy Laboratory, with funding provided by the Office of Science, Office of Basic Energy Sciences, as part of the Energy Frontier Research Center “Center for Next Generation of Materials Design: Incorporating Metastability”. We thank Dr. Mitsutaro Umehara for assistance with collection of cross-sectional SEM images. Author Contributions: L.Z. and A.S. contributed equally. The authors declare no competing financial interest.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Department of Energy (DOE)DE-AC02-05CH11231
Department of Energy (DOE)DE-AC36-08GO28308
Record Number:CaltechAUTHORS:20181017-090950761
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181017-090950761
Official Citation:Bi-Containing n-FeWO4 Thin Films Provide the Largest Photovoltage and Highest Stability for a Sub-2 eV Band Gap Photoanode. Lan Zhou, Aniketa Shinde, Santosh K. Suram, Helge S. Stein, Sage R. Bauers, Andriy Zakutayev, Joseph S. DuChene, Guiji Liu, Elizabeth A. Peterson, Jeffrey B. Neaton, and John M. Gregoire. ACS Energy Letters 2018 3 (11), 2769-2774. DOI: 10.1021/acsenergylett.8b01514
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90303
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Oct 2018 16:31
Last Modified:13 Nov 2018 19:31

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