CaltechAUTHORS
Published January 1, 2015 | Version Published + Supplemental Material
Journal Article Open

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

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon Joint Center for Artificial Photosynthesis

Abstract

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).

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.

Attached Files

Published - c4ee03012e.pdf

Supplemental Material - c4ee03012e1.pdf

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Additional details

Additional titles

Alternative 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

Identifiers

Eprint ID
51816
Resolver ID
CaltechAUTHORS:20141117-083607403

Funding

Department of Energy (DOE)
DE-SC0004993
Resnick Sustainability Institute
Gordon and Betty Moore Foundation

Dates

Created
2014-11-17
Created from EPrint's datestamp field
Updated
2023-04-13
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Resnick Sustainability Institute , Kavli Nanoscience Institute , JCAP