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Nature and Light Dependence of Bulk Recombination in Co-Pi-Catalyzed BiVO4 Photoanodes
Open accessAbstract
BiVO 4 is considered to be a promising photoanode material for solar water splitting applications. Its performance is limited by two main factors: slow water oxidation kinetics and poor charge separation. We confirm recent reports that cobalt phosphate (Co-Pi) is an efficient water oxidation catalyst for BiVO 4 and report an AM1.5 photocurrent of 1.7 mA/cm 2 at 1.23 V vs RHE for 100 nm spray-deposited, compact, and undoped BiVO 4 films with an optimized Co-Pi film thickness of 30 nm. The charge separation of these films depends strongly on light intensity, ranging from 90% at low light intensities to less than 20% at intensities corresponding to 1 sun. These observations indicate that the charge separation efficiency in BiVO 4 is limited by poor electron transport and not by the presence of bulk defect states, interface traps, or the presence of a Schottky junction at the back-contact.
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Metadata
- Authors
- Abdi, F. F., & van de Krol, R.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-04-20
- Volume
- 116
- Issue
- 17
- Pages
- 9398-9404
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W1983713181
- Cited by
- 573
- References
- 37
- FWCI
- 14.94
- Type
- journal article
- Language
- en
- Open access
- green
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