A direct coupled electrochemical system for capture and conversion of CO 2 from oceanwater.

Autor:	Digdaya IA; Joint Center for Artificial Photosynthesis and Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA., Sullivan I; Joint Center for Artificial Photosynthesis and Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA., Lin M; Department of Mechanical and Energy Engineering, Southern University of Science and Technology, 518055, Shenzhen, China. linm@sustech.edu.cn., Han L; Joint Center for Artificial Photosynthesis and Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA., Cheng WH; Joint Center for Artificial Photosynthesis and Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA, 91125, USA., Atwater HA; Joint Center for Artificial Photosynthesis and Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA, 91125, USA. haa@caltech.edu., Xiang C; Joint Center for Artificial Photosynthesis and Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA. cxx@caltech.edu.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2020 Sep 04; Vol. 11 (1), pp. 4412. Date of Electronic Publication: 2020 Sep 04.
DOI:	10.1038/s41467-020-18232-y
Abstrakt:	Capture and conversion of CO 2 from oceanwater can lead to net-negative emissions and can provide carbon source for synthetic fuels and chemical feedstocks at the gigaton per year scale. Here, we report a direct coupled, proof-of-concept electrochemical system that uses a bipolar membrane electrodialysis (BPMED) cell and a vapor-fed CO 2 reduction (CO 2 R) cell to capture and convert CO 2 from oceanwater. The BPMED cell replaces the commonly used water-splitting reaction with one-electron, reversible redox couples at the electrodes and demonstrates the ability to capture CO 2 at an electrochemical energy consumption of 155.4 kJ mol -1 or 0.98 kWh kg -1 of CO 2 and a CO 2 capture efficiency of 71%. The direct coupled, vapor-fed CO 2 R cell yields a total Faradaic efficiency of up to 95% for electrochemical CO 2 reduction to CO. The proof-of-concept system provides a unique technological pathway for CO 2 capture and conversion from oceanwater with only electrochemical processes.
Databáze:	MEDLINE
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