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Stabilization of Si microwire arrays for solar-driven H_2O oxidation to O_2(g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO_2

Shaner, Matthew R. and Hu, Shu and Sun, Ke and Lewis, Nathan S. (2015) Stabilization of Si microwire arrays for solar-driven H_2O oxidation to O_2(g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO_2. Energy and Environmental Science, 8 (1). pp. 203-207. ISSN 1754-5692. http://resolver.caltech.edu/CaltechAUTHORS:20141117-083607403

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Abstract

Conductive, amorphous TiO_2 coatings deposited by atomic-layer deposition, in combination with a sputter deposited NiCrO_x oxygen-evolution catalyst, have been used to protect Si microwire arrays from passivation or corrosion in contact with aqueous electrolytes. Coated np+-Si/TiO_2/NiCrO_x as well as heterojunction n-Si/TiO_2/NiCrO_x Si microwire-array photoanodes exhibited stable photoelectrochemical operation in aqueous ferri-/ferro-cyanide solutions. The coatings also allowed for photoanodic water oxidation in 1.0 M KOH(aq) solutions for >2200 h of continuous operation under simulated 1 Sun conditions with 100% Faradaic efficiency for the evolution of O_2(g).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c4ee03012eDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2015/EE/C4EE03012EPublisherArticle
http://www.rsc.org/suppdata/ee/c4/c4ee03012e/c4ee03012e1.pdfPublisherSupplementary Information
ORCID:
AuthorORCID
Sun, Ke0000-0001-8209-364X
Lewis, Nathan S.0000-0001-5245-0538
Alternate Title:Stabilization of Si microwire arrays for solar-driven H2O oxidation to O2(g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO2
Additional Information:© 2014 The Royal Society of Chemistry. Received 22 Sep 2014, Accepted 29 Oct 2014, First published online 05 Nov 2014. The authors would like to acknowledge Dr Ragip Pala for assistance with the spectral response measurement system. 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. R. S. is supported by a graduate fellowship from the Resnick Institute for Sustainability. The authors also acknowledge support from the Gordon and Betty Moore Foundation.
Group:Resnick Sustainability Institute, Kavli Nanoscience Institute, JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Resnick Sustainability InstituteUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20141117-083607403
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141117-083607403
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51816
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Nov 2014 21:31
Last Modified:31 Mar 2017 18:23

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