Enhancement in carbon dioxide activity and stability on nanostructured silver electrode and the role of oxygen

Michael Shincheon Jee, Hyo Sang Jeon, Cheonghee Kim, Hangil Lee, Jai Hyun Koh, Jinhan Cho, Byoung Koun Min, Yun Jeong Hwang

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Current energy production habits deplete fossil fuels and accumulate atmospheric CO2, which contribute to the global climate change. Electrochemical fuel production via CO2 reduction reaction is an idealistic yet an achievable process that mitigates CO2 emissions and simultaneously satisfies energy demands. Here, the enhancement of CO2 reduction activity and stability on size-controlled particulate Ag electrocatalysts derived from a simple, one-step cyclic voltammetry (CV) process by changing scan rates (1-200mV/s) was demonstrated. Interestingly, larger nanoparticles prepared by slower scan rates (1-5mV/s) have exhibited the most degree of enhancement for CO2 reduction to CO product. Compared to untreated Ag foil, nanostructured Ag electrode has shown an anodic shift of approximately 200mV in the onset potential of CO partial current density (jCO), 160mV reduction of overpotential at jCO=10mA/cm2, and increased Faradaic efficiency (F.E.) for CO production especially at lower biased potentials (-0.89 to -1.19V vs. RHE). Stability tests have demonstrated a drastic improvement in maintaining CO F.E. X-ray photoelectron spectroscopy suggests that the enhancement is associated with stable oxygen species incorporated on the nanoparticle Ag surfaces during the CV fabrication process.

Original languageEnglish
Pages (from-to)372-378
Number of pages7
JournalApplied Catalysis B: Environmental
Volume180
DOIs
Publication statusPublished - 2016 Dec 3

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Keywords

  • Cyclic voltammetry
  • Electrochemical CO reduction
  • Nanoparticle
  • Overpotential
  • Silver

ASJC Scopus subject areas

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

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