Journal
SCIENCE
Volume 352, Issue 6290, Pages 1210-1213Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf5039
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Funding
- Lee Kuan Yew Postdoctoral Fellowship
- NSF Graduate Research Fellowships Program
- Office of Naval Research Multidisciplinary University Research Initiative award [N00014-11-1-0725]
- Air Force Office of Scientific Research [FA9550-09-1-0689]
- Wyss Institute for Biologically Inspired Engineering
- Harvard University Climate Change Solutions Fund
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Artificial photosynthetic systems can store solar energy and chemically reduce CO2. We developed a hybrid water splitting-biosynthetic system based on a biocompatible Earth-abundant inorganic catalyst system to split water into molecular hydrogen and oxygen (H-2 and O-2) at low driving voltages. When grown in contact with these catalysts, Ralstonia eutropha consumed the produced H-2 to synthesize biomass and fuels or chemical products from low CO2 concentration in the presence of O-2. This scalable system has a CO2 reduction energy efficiency of similar to 50% when producing bacterial biomass and liquid fusel alcohols, scrubbing 180 grams of CO2 per kilowatt-hour of electricity. Coupling this hybrid device to existing photovoltaic systems would yield a CO2 reduction energy efficiency of similar to 10%, exceeding that of natural photosynthetic systems.
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