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

Matthew R. Shaner; Shu Hu; Ke Sun; Nathan S. Lewis

doi:10.1039/C4EE03012E

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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†

Matthew R. Shaner,^ab Shu Hu,^ab Ke Sun^ab and Nathan S. Lewis*^abcd

Author affiliations

* Corresponding authors

^a Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
E-mail: nslewis@caltech.edu

^b Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, CA 91125, USA

^c Beckman Institute Molecular Materials Research Center, California Institute of Technology, Pasadena, CA 91125, USA

^d Kavli Nanoscience Institute, California Institute of Technology, Pasadena, CA 91125, USA

Abstract

Conductive, amorphous TiO₂ 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/TiO₂/NiCrO_x as well as heterojunction n-Si/TiO₂/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 O₂(g).

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Article information

DOI: https://doi.org/10.1039/C4EE03012E
Article type: Communication
Submitted: 22 Sep 2014
Accepted: 29 Oct 2014
First published: 05 Nov 2014

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Energy Environ. Sci., 2015,8, 203-207

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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

M. R. Shaner, S. Hu, K. Sun and N. S. Lewis, Energy Environ. Sci., 2015, 8, 203 DOI: 10.1039/C4EE03012E

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