Hematite/Si Nanowire Dual-Absorber System for Photoelectrochemical Water Splitting at Low Applied Potentials
Top Cited Papers
- 16 July 2012
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 134 (30), 12406-12409
- https://doi.org/10.1021/ja3051734
Abstract
Hematite (α-Fe2O3) was grown on vertically aligned Si nanowires (NWs) using atomic layer deposition to form a dual-absorber system. Si NWs absorb photons that are transparent to hematite (600 nm < λ < 1100 nm) and convert the energy into additional photovoltage to assist photoelectrochemical (PEC) water splitting by hematite. Compared with hematite-only photoelectrodes, those with Si NWs exhibited a photocurrent turn-on potential as low as 0.6 V vs RHE. This result represents one of the lowest turn-on potentials observed for hematite-based PEC water splitting systems. It addresses a critical challenge of using hematite for PEC water splitting, namely, the fact that the band-edge positions are too positive for high-efficiency water splitting.Keywords
This publication has 34 references indexed in Scilit:
- A perspective on solar-driven water splitting with all-oxide hetero-nanostructuresEnergy & Environmental Science, 2011
- Hematite-based solar water splitting: challenges and opportunitiesEnergy & Environmental Science, 2011
- Solar Water Splitting: Progress Using Hematite (α‐Fe2O3) PhotoelectrodesChemSusChem, 2011
- Atomic Layer Deposition of Fe2O3 Using Ferrocene and OzoneThe Journal of Physical Chemistry C, 2011
- Solar Water Splitting CellsChemical Reviews, 2010
- Visible Light Water Splitting Using Dye-Sensitized Oxide SemiconductorsAccounts of Chemical Research, 2009
- Aqueous photoelectrochemistry of hematite nanorod arraySolar Energy Materials and Solar Cells, 2002
- Photoelectrochemical cellsNature, 2001
- Solar Energy ConversionPublished by Springer Science and Business Media LLC ,1990
- Electrochemical Photolysis of Water at a Semiconductor ElectrodeNature, 1972