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Acid Treatment Enables Suppression of Electron-Hole Recombination in Hematite for Photoelectrochemical Water Splitting
- Source :
- Angewandte Chemie International Edition
- Publication Year :
- 2016
- Publisher :
- Wiley, 2016.
-
Abstract
- We report a strategy for efficient suppression of electron-hole recombination in hematite photoanodes. Acid-treated hematite showed a substantially enhanced photocurrent density compared to untreated samples. Electrochemical impedance spectroscopy studies revealed that the enhanced photocurrent is partly due to improved efficiency of charge separation. Transient absorption spectroscopic studies coupled to electrochemical measurements indicate that, in addition to improved bulk electrochemical properties, acid-treated hematite has significantly decreased surface electron-hole recombination losses owing to a greater yield of the trapped photoelectrons being extracted to the external circuit.
- Subjects :
- Photocurrent
Chemistry
Analytical chemistry
General Medicine
02 engineering and technology
General Chemistry
Photoelectric effect
Hematite
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Catalysis
0104 chemical sciences
Dielectric spectroscopy
visual_art
Ultrafast laser spectroscopy
visual_art.visual_art_medium
Water splitting
QD
0210 nano-technology
Recombination
Subjects
Details
- ISSN :
- 14337851
- Volume :
- 55
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie International Edition
- Accession number :
- edsair.doi.dedup.....c4914bbfa27a5c1c8337ecbd5e736550