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Photoelectrochemistry of core–shell tandem junction n–p^+-Si/n-WO_3 microwire array photoelectrodes

Shaner, Matthew R. and Fountaine, Katherine T. and Ardo, Shane and Coridan, Robert H. and Atwater, Harry A. and Lewis, Nathan S. (2014) Photoelectrochemistry of core–shell tandem junction n–p^+-Si/n-WO_3 microwire array photoelectrodes. Energy and Environmental Science, 7 (2). pp. 779-790. ISSN 1754-5692. http://resolver.caltech.edu/CaltechAUTHORS:20140110-150648310

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Abstract

Tandem junction (n–p^+-Si/ITO/WO_3/liquid) core–shell microwire devices for solar-driven water splitting have been designed, fabricated and investigated photoelectrochemically. The tandem devices exhibited open-circuit potentials of E_(∝) = −1.21 V versus E^0′(O_2/H_2O), demonstrating additive voltages across the individual junctions (n–p^+-Si E_(∝) = −0.5 V versus solution; WO_3/liquid E_(∝) = −0.73 V versus E^0′(O_2/H_2O)). Optical concentration (12×, AM1.5D) shifted the open-circuit potential to E_(∝) = −1.27 V versus E^0′(O_2/H_2O) and resulted in unassisted H_2 production during two-electrode measurements (anode: tandem device, cathode: Pt disc). The solar energy-conversion efficiencies were very low, 0.0068% and 0.0019% when the cathode compartment was saturated with Ar or H_2, respectively, due to the non-optimal photovoltage and band-gap of the WO_3 that was used in the demonstration system to obtain stability of all of the system components under common operating conditions while also insuring product separation for safety purposes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://pubs.rsc.org/en/content/articlelanding/2014/ee/c3ee43048kPublisherArticle
http://dx.doi.org/10.1039/C3EE43048K DOIArticle
ORCID:
AuthorORCID
Fountaine, Katherine T.0000-0002-0414-8227
Coridan, Robert H.0000-0003-1916-4446
Atwater, Harry A.0000-0001-9435-0201
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2014 The Royal Society of Chemistry. Received 10 Sep 2013, Accepted 07 Nov 2013; First published online 16 Dec 2013. 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. M.S. acknowledges the Resnick Sustainability Institute for a graduate fellowship. K.F. is supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469. S.A. acknowledges support from a U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) Postdoctoral Research Award under the EERE Fuel Cell Technologies Program. The authors would like to thank Dr Shu Hu for assistance in boron doping, Rick Gerhart for fabrication of the electrochemical cells used and Dr Andrew Leenheer for the WO3 refractive index data.
Group:Resnick Sustainability Institute, JCAP
Funders:
Funding AgencyGrant Number
Joint Center for Artificial Photosynthesis (JCAP)UNSPECIFIED
Department of Energy (DOE)DE-SC0004993
Resnick Sustainability InstituteUNSPECIFIED
NSF Graduate Research FellowshipDGE-1144469
Record Number:CaltechAUTHORS:20140110-150648310
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140110-150648310
Official Citation:Photoelectrochemistry of core–shell tandem junction n–p+-Si/n-WO3 microwire array photoelectrodes Matthew R. Shaner, Katherine T. Fountaine, Shane Ardo, Rob H. Coridan, Harry A. Atwater and Nathan S. Lewis Energy Environ. Sci., 2014, 7, 779-790 DOI: 10.1039/C3EE43048K
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43320
Collection:CaltechAUTHORS
Deposited By: Heidi Rusina
Deposited On:11 Jan 2014 00:10
Last Modified:27 Apr 2017 17:53

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