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Balancing Surface Passivation and Catalysis with Integrated BiVO_4/(Fe-Ce)O_x Photoanodes in pH 9 Borate Electrolyte

Zhou, Lan and Shinde, Aniketa and Guevarra, Dan and Toma, Francesca M. and Stein, Helge S. and Gregoire, John M. and Haber, Joel A. (2018) Balancing Surface Passivation and Catalysis with Integrated BiVO_4/(Fe-Ce)O_x Photoanodes in pH 9 Borate Electrolyte. ACS Applied Energy Materials, 1 (10). pp. 5766-5771. ISSN 2574-0962. http://resolver.caltech.edu/CaltechAUTHORS:20180927-134054550

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Abstract

The performance of oxygen-evolving photoanodes based on bismuth vanadate (BiVO_4) is critically determined by the surface coating. While these coatings passivate surface defects, transport photogenerated holes, protect against corrosion, and aid catalysis, their optimal composition changes with operating pH, thus affecting overall performance. We use high-throughput photoelectrochemistry methods to map photoanode performance to enable the discovery of optimal composition and loading of Ce-rich sputter-deposited (Fe–Ce)O_x overlayers on undoped BiVO_4 in pH 9 borate buffer electrolyte. The optimal composition is found to be 20% Fe and 80% Ce with an optimal Fe + Ce metal loading of 0.9 nmol mm^(–2). Analysis of the composition and loading dependence of (i) the photocurrent transients upon illumination toggling, (ii) stabilized photocurrent densities, and (iii) photogenerated hole-transfer efficiency reveals the confluence of phenomena that gives rise to the optimal performance yielding nearly perfect transfer efficiency over a narrow composition window.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acsaem.8b01377DOIArticle
https://pubs.acs.org/doi/suppl/10.1021/acsaem.8b01377PublisherSupporting Information
ORCID:
AuthorORCID
Shinde, Aniketa0000-0003-2386-3848
Toma, Francesca M.0000-0003-2332-0798
Stein, Helge S.0000-0002-3461-0232
Gregoire, John M.0000-0002-2863-5265
Haber, Joel A.0000-0001-7847-5506
Alternate Title:Balancing Surface Passivation and Catalysis with Integrated BiVO4/(Fe-Ce)Ox Photoanodes in pH 9 Borate Electrolyte
Additional Information:© 2018 American Chemical Society. Received: August 17, 2018; Accepted: September 26, 2018; Published: September 26, 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. Author Contributions: L.Z. and A.S. contributed equally to this work. The authors declare no competing financial interest.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Subject Keywords:high-throughput screening, solar fuels, oxygen evolution reaction, photoanode, bismuth vanadate
Record Number:CaltechAUTHORS:20180927-134054550
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180927-134054550
Official Citation:Balancing Surface Passivation and Catalysis with Integrated BiVO4/(Fe–Ce)Ox Photoanodes in pH 9 Borate Electrolyte. Lan Zhou, Aniketa Shinde, Dan Guevarra, Francesca M. Toma, Helge S. Stein, John M. Gregoire, and Joel A. Haber. ACS Applied Energy Materials 2018 1 (10), 5766-5771. DOI: 10.1021/acsaem.8b01377
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90041
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Sep 2018 20:53
Last Modified:22 Oct 2018 20:58

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