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Efficient Solar Water Splitting, Exemplified by RuO2-Catalyzed AlGaAs/Si Photoelectrolysis
Abstract
Contemporary models are shown to significantly underestimate the attainable efficiency of solar energy conversion to water splitting, and experimentally a cell containing illuminated AlGaAs/Si RuO 2 /Pt black is demonstrated to evolve H 2 and O 2 at record solar driven water electrolysis efficiency. Under illumination, bipolar configured Al 0.15 Ga 0.85 As ( E g = 1.6 eV) and Si ( E g = 1.1 eV) semiconductors generate open circuit and maximum power photopotentials of 1.30 and 1.57 V, well suited to the water electrolysis thermodynamic potential: H 2 O → H 2 + 1 / 2 O 2; E ° H 2 O = E O 2 − E H 2; E ° H 2 O (25 °C) = 1.229 V. The E ° H 2 O /photopotential matched semiconductors are combined with effective water electrolysis O 2 or H 2 electrocatalysts, RuO 2 or Pt black . The resultant solar photoelectrolysis cell drives sustained water splitting at 18.3% conversion efficiencies. Alternate dual band gap systems are calculated to be capable of attaining over 30% solar photoelectrolysis conversion efficiency.
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Cites
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An Optically Transparent Iron Nickel Oxide Catalyst for Solar Water Splitting
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Metadata
- Authors
- Licht, S., Wang, B., Mukerji, S., Soga, T., Umeno, M., & Tributsch, H.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-09-01
- Volume
- 104
- Issue
- 38
- Pages
- 8920-8924
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2042209259
- Cited by
- 367
- References
- 1
- FWCI
- 9.26
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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