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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

Shaner, Matthew R. and Hu, Shu and Sun, Ke and Lewis, Nathan S. (2015) 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. Energy and Environmental Science, 8 (1). pp. 203-207. ISSN 1754-5692. doi:10.1039/c4ee03012e.

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Conductive, amorphous TiO₂ coatings deposited by atomic-layer deposition, in combination with a sputter deposited NiCrOₓ oxygen-evolution catalyst, have been used to protect Si microwire arrays from passivation or corrosion in contact with aqueous electrolytes. Coated np⁺-Si/TiO₂/NiCrOₓ as well as heterojunction n-Si/TiO₂/NiCrOₓ 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 O₂(g).

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Shaner, Matthew R.0000-0003-4682-9757
Hu, Shu0000-0002-5041-0169
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
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Resnick Sustainability InstituteUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20141117-083607403
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51816
Deposited By: Tony Diaz
Deposited On:17 Nov 2014 21:31
Last Modified:13 Apr 2023 17:09

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