Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 37, Pages 11461-11466Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1508075112
Keywords
artificial photosynthesis; solar fuels; photocatalysis; carbon dioxide fixation; water splitting
Categories
Funding
- DOE/LBNL [DE-AC02-05CH11231, FWP CH030201]
- Laboratory Directed Research and Development Seed Grant from LBNL
- National Science Foundation Graduate Research Fellowship Program (NSF GRFP)
- NIH [1 T32 GMO66698, S10RR025622]
- NSF GRFP [DGE-0802270]
- University of California, Berkeley Chancellor's fellowship
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Natural photosynthesis harnesses solar energy to convert CO2 and water to value-added chemical products for sustaining life. We present a hybrid bioinorganic approach to solar-to-chemical conversion in which sustainable electrical and/or solar input drives production of hydrogen from water splitting using biocompatible inorganic catalysts. The hydrogen is then used by living cells as a source of reducing equivalents for conversion of CO2 to the value-added chemical product methane. Using platinum or an earth-abundant substitute, alpha-NiS, as biocompatible hydrogen evolution reaction (HER) electrocatalysts and Methanosarcina barkeri as a biocatalyst for CO2 fixation, we demonstrate robust and efficient electrochemical CO2 to CH4 conversion at up to 86% overall Faradaic efficiency for >= 7 d. Introduction of indium phosphide photocathodes and titanium dioxide photoanodes affords a fully solar-driven system for methane generation from water and CO2, establishing that compatible inorganic and biological components can synergistically couple light-harvesting and catalytic functions for solar-to-chemical conversion.
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