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Title: Membraneless laminar flow cell for electrocatalytic CO 2 reduction with liquid product separation

The production of liquid fuel products via electrochemical reduction of CO 2 is a potential path to produce sustainable fuels. However, to be practical, a separation strategy is required to isolate the fuel-containing electrolyte produced at the cathode from the anode and also prevent the oxidation products (i.e. O 2) from reaching the cathode. Ion-conducting membranes have been applied in CO 2 reduction reactors to achieve this separation, but they represent an efficiency loss and can be permeable to some product species. An alternative membraneless approach is developed here to maintain product separation through the use of a laminar flow cell. Computational modelling shows that near-unity separation efficiencies are possible at current densities achievable now with metal cathodes via optimization of the spacing between the electrodes and the electrolyte flow rate. Laminar flow reactor prototypes were fabricated with a range of channel widths by 3D printing. CO 2 reduction to formic acid on Sn electrodes was used as the liquid product forming reaction, and the separation efficiency for the dissolved product was evaluated with high performance liquid chromatography. Trends in product separation efficiency with channel width and flow rate were in qualitative agreement with the model, but the separation efficiencymore » was lower, with a maximum value of 90% achieved.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. D, Applied Physics
Additional Journal Information:
Journal Volume: 50; Journal Issue: 15; Journal ID: ISSN 0022-3727
Publisher:
IOP Publishing
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1393135

Monroe, Morgan M., Lobaccaro, Peter, Lum, Yanwei, and Ager, Joel W.. Membraneless laminar flow cell for electrocatalytic CO2 reduction with liquid product separation. United States: N. p., Web. doi:10.1088/1361-6463/aa6359.
Monroe, Morgan M., Lobaccaro, Peter, Lum, Yanwei, & Ager, Joel W.. Membraneless laminar flow cell for electrocatalytic CO2 reduction with liquid product separation. United States. doi:10.1088/1361-6463/aa6359.
Monroe, Morgan M., Lobaccaro, Peter, Lum, Yanwei, and Ager, Joel W.. 2017. "Membraneless laminar flow cell for electrocatalytic CO2 reduction with liquid product separation". United States. doi:10.1088/1361-6463/aa6359. https://www.osti.gov/servlets/purl/1393135.
@article{osti_1393135,
title = {Membraneless laminar flow cell for electrocatalytic CO2 reduction with liquid product separation},
author = {Monroe, Morgan M. and Lobaccaro, Peter and Lum, Yanwei and Ager, Joel W.},
abstractNote = {The production of liquid fuel products via electrochemical reduction of CO2 is a potential path to produce sustainable fuels. However, to be practical, a separation strategy is required to isolate the fuel-containing electrolyte produced at the cathode from the anode and also prevent the oxidation products (i.e. O2) from reaching the cathode. Ion-conducting membranes have been applied in CO2 reduction reactors to achieve this separation, but they represent an efficiency loss and can be permeable to some product species. An alternative membraneless approach is developed here to maintain product separation through the use of a laminar flow cell. Computational modelling shows that near-unity separation efficiencies are possible at current densities achievable now with metal cathodes via optimization of the spacing between the electrodes and the electrolyte flow rate. Laminar flow reactor prototypes were fabricated with a range of channel widths by 3D printing. CO2 reduction to formic acid on Sn electrodes was used as the liquid product forming reaction, and the separation efficiency for the dissolved product was evaluated with high performance liquid chromatography. Trends in product separation efficiency with channel width and flow rate were in qualitative agreement with the model, but the separation efficiency was lower, with a maximum value of 90% achieved.},
doi = {10.1088/1361-6463/aa6359},
journal = {Journal of Physics. D, Applied Physics},
number = 15,
volume = 50,
place = {United States},
year = {2017},
month = {3}
}