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

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

California Institute of Technology

Research output: Contribution to journal › Article › peer-review

89 Citations (Scopus)

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).

Original language	English
Pages (from-to)	203-207
Number of pages	5
Journal	Energy and Environmental Science
Volume	8
Issue number	1
DOIs	https://doi.org/10.1039/c4ee03012e
Publication status	Published - Jan 1 2015

ASJC Scopus subject areas

Environmental Chemistry
Renewable Energy, Sustainability and the Environment
Nuclear Energy and Engineering
Pollution

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10.1039/c4ee03012e

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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).",

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