期刊
NATURE CATALYSIS
卷 2, 期 5, 页码 407-414出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41929-019-0264-0
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资金
- NIH [5T32GM067555-12]
- Eugene V. Cota-Robles fellowship
- University of California, Los Angeles
- Jeffery and Helo Zink Endowed Professional Development Term Chair
- John D. McTague Career Development Term Chair
Combining inorganic catalysts with CO2-fixing microorganisms has displayed a high efficiency for electricity-driven CO2 reduction. However, the maximum throughput can be limited by the low solubility of mediators, such as H-2, that deliver reducing equivalents from the electrodes to the microbes. Here we report that the introduction of a biocompatible perfluorocarbon nanoemulsion as a H-2 carrier increases the throughput of CO2 reduction into acetic acid by 190%. With the acetogen Sporomusa ovata as a model system, an average acetate titre of 6.4 +/- 1.1 g l(-1) (107 mM) was achieved in four days with close to 100% Faradaic efficiency. This is equivalent to a productivity of 1.1 mM h(-1), among the highest in bioelectrochemical systems. A mechanistic investigation shows that the non-specific binding of perfluorocarbon nanoemulsions promotes the kinetics of H-2 transfer and subsequent oxidation by more than threefold. Introducing nanoscale gas carriers is viable to alleviate throughput bottlenecks in the electricity-driven microbial CO2 reduction into commodity chemicals.
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