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Improved Stability of Polycrystalline Bismuth Vanadate Photoanodes by Use of Dual-Layer Thin TiO_2/Ni Coatings

McDowell, Matthew T. and Lichterman, Michael F. and Spurgeon, Joshua M. and Hu, Shu and Sharp, Ian D. and Brunschwig, Bruce S. and Lewis, Nathan S. (2014) Improved Stability of Polycrystalline Bismuth Vanadate Photoanodes by Use of Dual-Layer Thin TiO_2/Ni Coatings. Journal of Physical Chemistry C, 118 (34). pp. 19618-19624. ISSN 1932-7447. http://resolver.caltech.edu/CaltechAUTHORS:20140825-134317366

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Abstract

Ultrathin dual layers of TiO_2 and Ni have been used to stabilize polycrystalline BiVO_4 photoanodes against photocorrosion in an aqueous alkaline (pH = 13) electrolyte. Conformal, amorphous TiO_2 layers were deposited on BiVO_4 thin films by atomic-layer deposition, with Ni deposited onto the TiO_2 by sputtering. Under simulated air mass 1.5 illumination, the dual-layer coating extended the lifetime of the BiVO4 photoanodes during photoelectrochemical water oxidation from minutes, for bare BiVO4, to hours, for the modified electrodes. X-ray photoelectron spectroscopy showed that these layers imparted chemical stability to the semiconductor/electrolyte interface. Transmission electron microscopy revealed the structure and morphology of the polycrystalline BiVO_4 film as well as of the thin coating layers. This work demonstrates that protection schemes based on ultrathin corrosion-resistant overlayers can be applied beneficially to polycrystalline photoanode materials under conditions relevant to efficient solar-driven water-splitting systems.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/jp506133yDOIArticle
http://pubs.acs.org/doi/abs/10.1021/jp506133yPublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/jp506133yPublisherSupporting Information
ORCID:
AuthorORCID
Lichterman, Michael F.0000-0002-0710-7068
Sharp, Ian D.0000-0001-5238-7487
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Alternate Title:Improved Stability of Polycrystalline Bismuth Vanadate Photoanodes by Use of Dual-Layer Thin TiO2/Ni Coatings
Additional Information:© 2014 American Chemical Society. Received: June 20, 2014; Revised: August 6, 2014; Published: August 7, 2014. This material is based upon work performed at 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 DE-SC0004993. XPS data were collected at the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Record Number:CaltechAUTHORS:20140825-134317366
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140825-134317366
Official Citation:Improved Stability of Polycrystalline Bismuth Vanadate Photoanodes by Use of Dual-Layer Thin TiO2/Ni Coatings Matthew T. McDowell, Michael F. Lichterman, Joshua M. Spurgeon, Shu Hu, Ian D. Sharp, Bruce S. Brunschwig, and Nathan S. Lewis The Journal of Physical Chemistry C 2014 118 (34), 19618-19624
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48856
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:25 Aug 2014 21:21
Last Modified:08 Nov 2018 22:16

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