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A quantitative assessment of the competition between water and anion oxidation at WO_3 photoanodes in acidic aqueous electrolytes

Mi, Qixi and Zhanaidarova, Almagul and Brunschwig, Bruce S. and Gray, Harry B. and Lewis, Nathan S. (2012) A quantitative assessment of the competition between water and anion oxidation at WO_3 photoanodes in acidic aqueous electrolytes. Energy and Environmental Science, 5 (2). pp. 5694-5700. ISSN 1754-5692. http://resolver.caltech.edu/CaltechAUTHORS:20120228-074506627

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Abstract

The faradaic efficiency for O_2(g) evolution at thin-film WO_3 photoanodes has been evaluated in a series of acidic aqueous electrolytes. In 1.0 M H_2SO_4, persulfate was the predominant photoelectrochemical oxidation product, and no O_2 was detected unless catalytic quantities of Ag^+(aq) were added to the electrolyte. In contact with 1.0 M HClO_4, dissolved O_2 was observed with nearly unity faradaic efficiency, but addition of a hole scavenger, 4-cyanopyridine N-oxide, completely suppressed O_2 formation. In 1.0 M HCl, Cl_2(g) was the primary oxidation product. These results indicate that at WO_3 photoanodes, water oxidation is dominated by oxidation of the acid anions in 1.0 M HCl, H_2SO_4, and HClO_4, respectively.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c2ee02929dDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2012/EE/c2ee02929dPublisherArticle
ORCID:
AuthorORCID
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2012 The Royal Society of Chemistry. Received 19th October 2011, Accepted 7th December 2011. First published on the web 03 Jan 2012. We acknowledge the National Science Foundation (NSF) Powering the Planet Center for Chemical Innovation (CCI-Solar), Grants CHE-0802907 and CHE-0947829, and the Molecular Materials Research Center of the Beckman Institute at the California Institute of Technology, for support. QM also acknowledges the NSF for support as a CCI-Solar Postdoctoral Fellow.
Group:CCI Solar Fuels
Funders:
Funding AgencyGrant Number
NSFCHE-0802907
NSFCHE-0947829
Caltech Beckman InstituteUNSPECIFIED
NSF Postdoctoral FellowshipUNSPECIFIED
Record Number:CaltechAUTHORS:20120228-074506627
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120228-074506627
Official Citation:A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes Qixi Mi, Almagul Zhanaidarova, Bruce S. Brunschwig, Harry B. Gray and Nathan S. Lewis Energy Environ. Sci., 2012, 5, 5694-5700 DOI: 10.1039/C2EE02929D
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29496
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:28 Feb 2012 16:01
Last Modified:02 Feb 2017 22:57

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