Activation of C2H4 reaction pathways in electrochemical CO2 reduction under low CO2 partial pressure

Hakhyeon Song, Jun Tae Song, Beomil Kim, Ying Chuan Tan, Jihun Oh

Research output: Contribution to journalArticle

Abstract

Selective conversion of CO2 to fuels and chemicals has been considered one of the key challenges in the electrochemical CO2 reduction reaction (CO2RR). Here, we demonstrate the reaction pathways for CO and C2H4 formation on Cu can be regulated by supplying different CO2 partial pressures. Although it is believed high concentration of surface bound CO is required for C2H4 formation, we show excessive supply of CO2 interferes with C–C coupling and suppress C2H4 reaction pathways. This indicates C2H4 reaction pathways are limited by the surface recombination of surface bound CO and hydrogen, and the kinetics is affected by adsorbate-adsorbate interactions and/or by physical blocking of active sites on Cu with excess CO2. Through systematic study, we demonstrate a dilute CO2 stream selectively activates C2H4 formation with significant reduction of the overpotentials (∼ 400 mV) to achieve ∼50% C2H4 Faradaic efficiency and enhancement in the C2H4 current density (∼50 mA cm−2).

Original languageEnglish
Article number119049
JournalApplied Catalysis B: Environmental
Volume272
DOIs
Publication statusPublished - Sep 5 2020

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Fingerprint Dive into the research topics of 'Activation of C<sub>2</sub>H<sub>4</sub> reaction pathways in electrochemical CO<sub>2</sub> reduction under low CO<sub>2</sub> partial pressure'. Together they form a unique fingerprint.

  • Cite this