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

Paper ID Volume ID Publish Year Pages File Format Full-Text
45254 46407 2016 7 PDF Available
Title
Enhancement in carbon dioxide activity and stability on nanostructured silver electrode and the role of oxygen
Abstract

•Nanostructured silver electrodes were made with a simple electrochemical process.•The nanostructured silver electrode exhibited enhanced CO2 reduction activities.•Electrocatalytic CO2 reduction was stable compared to untreated silver electrodes.•The enhancement is associated with stable oxygen species silver surfaces.

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 (1–200 mV/s) was demonstrated. Interestingly, larger nanoparticles prepared by slower scan rates (1–5 mV/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 200 mV in the onset potential of CO partial current density (jCO), 160 mV reduction of overpotential at jCO = 10 mA/cm2, and increased 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 species incorporated on the nanoparticle Ag surfaces during the CV fabrication process.

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Keywords
Electrochemical CO2 reduction; Nanoparticle; Silver; Overpotential; Cyclic voltammetry
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Enhancement in carbon dioxide activity and stability on nanostructured silver electrode and the role of oxygen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 372–378
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us