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).
| Original language | English |
|---|---|
| Pages (from-to) | 203-207 |
| Number of pages | 5 |
| Journal | Energy and Environmental Science |
| Volume | 8 |
| Issue number | 1 |
| DOIs | |
| 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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Cite this
Shaner, M. R., Hu, S., Sun, K., & Lewis, N. 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), 203-207. https://doi.org/10.1039/c4ee03012e