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Understanding Surface Recombination Processes Using Intensity-Modulated Photovoltage Spectroscopy on Hematite Photoanodes for Solar Water Splitting
- Publisher :
- WILEY-V C H VERLAG GMBH
-
Abstract
- Converting solar energy into hydrogen through photoelectrochemical (PEC) water splitting offers a promising route towards a fully renewable energy economy. A fundamental understanding of photogenerated charge recombination processes in semiconducting photoelectrodes is a key consideration in optimizing solar water splitting cells and intensity-modulated photovoltage spectroscopy (IMVS) has recently emerged as a promising technique for gaining new insight. However, the interpretation of IMVS data under various conditions (that is, when photoelectrodes are in sacrificial electrolytes or employ catalytic overlayers) is not complete. Using IMVS data we present herein an analysis of charge recombination processes under open circuit conditions on a model photoanode system: nanostructured hematite. Employing two sacrificial oxidation conditions compared to standard water oxidation conditions, our IMVS results establish a direct correlation between surface recombination processes and the low frequency IMVS response. We found that surface intermediate states for water oxidation under open circuit condition exhibit a lifetime of 229 ms under standard illumination conditions. Applying a nickel iron oxide overlayer also gives insight into surface passivation effects through IMVS analysis of photoanode system.
- Subjects :
- Surface (mathematics)
energy conversion
surface recombination
magnetite
oxidation
alpha-fe2o3
02 engineering and technology
010402 general chemistry
01 natural sciences
7. Clean energy
Biochemistry
water splitting
Catalysis
Solar water
efficient
Inorganic Chemistry
solar energy conversion
Drug Discovery
Energy transformation
Physical and Theoretical Chemistry
Spectroscopy
Chemistry
Organic Chemistry
Hematite
021001 nanoscience & nanotechnology
0104 chemical sciences
operando analysis
maghemite
13. Climate action
Chemical physics
visual_art
visual_art.visual_art_medium
Water splitting
organic photovoltaics
0210 nano-technology
light
Intensity (heat transfer)
Recombination
intensity-modulated photovoltage spectroscopy
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....85dd88f3f92d472aacb49fad18fa5763