4.7 Article

Effect of Humidity on C1, C2 Product Selectivity for CO2 Reduction in a Hybrid Gas/Liquid Electrochemical Reactor

Journal

ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 8, Pages 9309-9314

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c02226

Keywords

electrochemical flow reactor; hybrid gas/liquid reactor; CO2 reduction reaction; hydrogen evolution reaction product selectivity; three-phase interface

Funding

  1. National Science Foundation [CHE-1954838]
  2. U.S. Air Force small business technology transfer research program [FA8649-22-P-0099]
  3. Center for Nanophase Materials Sciences (CNMS)
  4. Duke University Shared Materials Instrumentation Facility (SMIF)
  5. US Department of Energy, Office of Science User Facility at Oak Ridge National Laboratory
  6. National Science Foundation as part of the National Nanotechnology Coordinated Infrastructure (NNCI) [ECCS-1542015]
  7. U.S. Department of Energy (DOE)
  8. DOD
  9. DOE [DE-SC0014664]

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This article investigates the use of hybrid gas/liquid-fed electrochemical flow reactors for chemical synthesis and how catalytic product selectivity can be optimized by controlling gas phase reactants. It is found that adding water vapor to the flowing CO2 supply can change the selectivity of the CO2 reduction reaction, increasing the overall faradaic efficiency of hydrocarbon production while reducing hydrogen gas production.
Hybrid gas/liquid-fed electrochemical flow reactors may become attractive alternatives for chemical synthesis once it is understood how catalytic product selectivity may be optimized through the control of gas phase reactants. Using a constant pH basic electrolyte to suppress the hydrogen evolution reaction, we explore how protonation by water vapor added to the flowing CO2 supply affects the CO(2)reduction reaction. Although H2 remains the dominant product, supplying dry CO2 gas selectively produces more C-2 products than C-1. However, adding protons through water vapor changes selectivity toward C-1 products, increasing the overall faradaic efficiency of hydrocarbon production while reducing H-2 production.

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