CaltechAUTHORS
  A Caltech Library Service

Factors affecting bismuth vanadate photoelectrochemical performance

Sinclair, Timothy S. and Hunter, Bryan M. and Winkler, Jay R. and Gray, Harry B. and Müller, Astrid M. (2015) Factors affecting bismuth vanadate photoelectrochemical performance. Materials Horizons, 2 (3). pp. 330-337. ISSN 2051-6347. http://resolver.caltech.edu/CaltechAUTHORS:20141222-075342492

[img] PDF - Published Version
See Usage Policy.

997Kb
[img]
Preview
PDF - Supplemental Material
See Usage Policy.

13Mb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20141222-075342492

Abstract

Bismuth vanadate is a promising photoanode material, but recent reports on undoped BiVO_4 without sublayers and co-catalysts showed large variations in photocurrent generation. We addressed this issue by correlating photoelectrochemical performance with physical properties. We devised a novel anodic electrodeposition procedure with iodide added to the aqueous plating bath, which allowed us to prepare BiVO_4 photoanodes with virtually identical thicknesses but different morphologies, and we could control surface Bi content. Morphologies were quantified from SEM images as distributions of crystallite areas and aspect-ratio-normalised diameters, and their statistical moments were derived. We could obtain clear photocurrent generation trends only from bivariate data analysis. Our experimental evidence suggests that a combination of low Bi/V ratio, small aspect-ratio-normalised diameters, and crystallites sizes that were small enough to provide efficient charge separation yet sufficiently large to prevent mass transport limitations led to highest photoelectrochemical performance.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c4mh00156gDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2015/MH/C4MH00156GPublisherArticle
ORCID:
AuthorORCID
Winkler, Jay R.0000-0002-4453-9716
Additional Information:© 2015 The Royal Society of Chemistry. Received 22 Aug 2014, Accepted 02 Dec 2014, First published online 02 Dec 2014. We thank June Wicks for help with SEM imaging, Matthew Shaner for providing electrodeposited BiVO_4 samples on FTO-glass prepared according to Choi, Richard P. Gerhart for fabrication of the photoelectrochemical cell, and Robert H. Coridan for valuable discussions. Research was performed at the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology. T.S.S. acknowledges a SURF Fellowship in honour of Dr Terry Cole, and B.M.H. is an NSF Graduate Fellow. This work was supported by the NSF CCI Solar Fuels Program (CHE-1305124) and the Arnold and Mabel Beckman Foundation.
Group:CCI Solar Fuels
Funders:
Funding AgencyGrant Number
NSFCHE-1305124
Arnold and Mabel Beckman FoundationUNSPECIFIED
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Record Number:CaltechAUTHORS:20141222-075342492
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141222-075342492
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53059
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Dec 2014 18:45
Last Modified:15 Sep 2017 22:38

Repository Staff Only: item control page