Enhancement of Catalytic Activity and Selectivity for the Gaseous Electroreduction of CO2 to CO: Guidelines for the Selection of Carbon Supports

Chulwan Lim, Woong Hee Lee, Jong Ho Won, Young Jin Ko, Sangkuk Kim, Byoung Koun Min, Kwan Young Lee, Won Suk Jung, Hyung Suk Oh

Research output: Contribution to journalArticlepeer-review

Abstract

To secure the economic feasibility of electrochemical carbon dioxide reduction reaction (CO2RR), a method of using support materials to reduce the amount of catalyst loading and increase catalytic activity for CO2RR can be a solution. Herein, guidelines for selecting carbon support materials suitable for CO2RR are reported. In a gaseous CO2-fed CO2RR electrolyzer, an Ag nanoparticle-composited carbon nanocage (denoted as Ag/CNC) electrode exhibits an optimal performance for CO2RR with a partial current density of ≈400 mA cm−2. Ag/CNC showcases a uniformly dispersed morphology with Ag nanoparticles and sufficient hydrophobicity after the reaction to prevent flooding, which is known to inhibit the mass transfer of CO2. Furthermore, the CNCs possess small amounts of carbon defects; this suppresses the catalytic activity for the hydrogen evolution reaction (HER), which is a side reaction of CO2RR. Results of a three-stack cell experiment with the Ag/CNC electrode reveal the possibility of a support-based strategy for achieving an industrial-level scaling of CO2RR. This study suggests that the support material for CO2RR should be considered not only on the basis of the morphology of carbon, uniform dispersion of Ag nanoparticles, and hydrophobicity of the electrode but also factors influencing the HER, such as carbon defects.

Original languageEnglish
Article number2100216
JournalAdvanced Sustainable Systems
Volume5
Issue number12
DOIs
Publication statusPublished - 2021 Dec

Keywords

  • carbon dioxide reduction reaction
  • carbon monoxide
  • carbon support
  • hydrophobicity
  • micro computed tomography

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)

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