Journal
SCIENCE
Volume 334, Issue 6056, Pages 645-648Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1209816
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Funding
- ARPA-E [DE-AR0000036]
- National Science Foundation [CHE-0533150]
- AFOSR [FA9550-09-1-0689]
- Chesonis Family Foundation
- Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organization for Scientific Research (NWO)
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0802907] Funding Source: National Science Foundation
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We describe the development of solar water-splitting cells comprising earth-abundant elements that operate in near-neutral pH conditions, both with and without connecting wires. The cells consist of a triple junction, amorphous silicon photovoltaic interfaced to hydrogen- and oxygen-evolving catalysts made from an alloy of earth-abundant metals and a cobalt|borate catalyst, respectively. The devices described here carry out the solar-driven water-splitting reaction at efficiencies of 4.7% for a wired configuration and 2.5% for a wireless configuration when illuminated with 1 sun (100 milliwatts per square centimeter) of air mass 1.5 simulated sunlight. Fuel-forming catalysts interfaced with light-harvesting semiconductors afford a pathway to direct solar-to-fuels conversion that captures many of the basic functional elements of a leaf.
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