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

Title
Enhancement in carbon dioxide activity and stability on nanostructured silver electrode and the role of oxygen
Authors
지신천전효상김청희이한길고재현조진한민병권황윤정
Keywords
Electrochemical CO2reduction; Nanoparticle; Silver; Overpotential; Cyclic voltammetry
Issue Date
2016-01
Publisher
Applied catalysis B, Environmental
Citation
VOL 180, 372-378
Abstract
Current energy production habits deplete fossil fuels and accumulate atmospheric CO2, which contributeto the global climate change. Electrochemical fuel production via CO2reduction reaction is an idealistic yetan achievable process that mitigates CO2emissions and simultaneously satisfies energy demands. Here,the enhancement of CO2reduction activity and stability on size-controlled particulate Ag electrocatalystsderived from a simple, one-step cyclic voltammetry (CV) process by changing scan rates (1–200 mV/s)was demonstrated. Interestingly, larger nanoparticles prepared by slower scan rates (1–5 mV/s) haveexhibited the most degree of enhancement for CO2reduction to CO product. Compared to untreatedAg foil, nanostructured Ag electrode has shown an anodic shift of approximately 200 mV in the onsetpotential of CO partial current density (jCO), 160 mV reduction of overpotential at jCO= 10 mA/cm2, andincreased Faradaic efficiency (F.E.) for CO production especially at lower biased potentials (−0.89 to−1.19 V 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 speciesincorporated on the nanoparticle Ag surfaces during the CV fabrication process.
URI
http://pubs.kist.re.kr/handle/201004/49992
ISSN
09263373
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KIST Publication > Article
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