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. https://resolver.caltech.edu/CaltechAUTHORS:20141117-083607403

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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).

Item Type:

Article

Related URLs:

URL	URL Type	Description
http://dx.doi.org/10.1039/c4ee03012e	DOI	Article
http://www.rsc.org/suppdata/ee/c4/c4ee03012e/c4ee03012e1.pdf	Publisher	Supplementary Information

ORCID:

Author	ORCID
Shaner, Matthew R.	0000-0003-4682-9757
Hu, Shu	0000-0002-5041-0169
Sun, Ke	0000-0001-8209-364X
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 Agency	Grant Number
Department of Energy (DOE)	DE-SC0004993
Resnick Sustainability Institute	UNSPECIFIED
Gordon and Betty Moore Foundation	UNSPECIFIED

Issue or Number:

DOI:

10.1039/c4ee03012e

Record Number:

CaltechAUTHORS:20141117-083607403

Persistent URL:

https://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:

13 Apr 2023 17:09

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