Concentrated Ethanol Electrosynthesis from CO2 via a Porous Hydrophobic Adlayer

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

13 Scopus Citations
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Author(s)

  • Anthony Robb
  • Adnan Ozden
  • Rui Kai Miao
  • Colin P. O’Brien
  • Yi Xu
  • Christine M. Gabardo
  • Nana Zhao
  • F. Pelayo García de Arquer
  • Edward H. Sargent
  • David Sinton

Detail(s)

Original languageEnglish
Pages (from-to)4155-4162
Journal / PublicationACS Applied Materials and Interfaces
Volume14
Issue number3
Online published14 Jan 2022
Publication statusPublished - 26 Jan 2022
Externally publishedYes

Abstract

Electrochemical CO2 reduction can convert waste emissions into dense liquid fuels compatible with existing energy infrastructure. High-rate electrocatalytic conversion of CO2 to ethanol has been achieved in membrane electrode assembly (MEA) electrolyzers; however, ethanol produced at the cathode is transported, via electroosmotic drag and diffusion, to the anode, where it is diluted and may be oxidized. The ethanol concentrations that result on both the cathodic and anodic sides are too low to justify the energetic and financial cost of downstream separation. Here, we present a porous catalyst adlayer that facilitates the evaporation of ethanol into the cathode gas stream and reduces the water transport, leading to a recoverable stream of concentrated ethanol. The adlayer is comprised of ethylcellulose-bonded carbon nanoparticles and forms a porous, electrically conductive network on the surface of the copper catalyst that slows the transport of water to the gas channel. We achieve the direct production of an ethanol stream of 12.4 wt %, competitive with the concentration of current industrial ethanol production processes.

Research Area(s)

  • adlayer, carbon dioxide, concentrated, electrocatalysis, ethanol, hydrophobic, porous, reduction

Citation Format(s)

Concentrated Ethanol Electrosynthesis from CO2 via a Porous Hydrophobic Adlayer. / Robb, Anthony; Ozden, Adnan; Miao, Rui Kai et al.
In: ACS Applied Materials and Interfaces, Vol. 14, No. 3, 26.01.2022, p. 4155-4162.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review