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Selective electroreduction of CO2 to formate on 3D [100] Pb dendrites with nanometer-sized needle-like tips

Abstract

Honeycomb-like porous Pb films with a dendrite-like secondary structure growing along the [100]-axis were prepared by Templating Hydrogen Bubble Templating (DHBT) and used for the electroreduction of CO2. Detailed physicochemical characterization of the porous films revealed that the thickness (up to 70 µm) and electrochemical active surface area (up to 1500 cm2) of the porous Pb films could be tuned through the current density (varied between -1 and -4 Acm-2) and deposition time (varied between 3 and 60 s). The electrochemical activity and stability of the electrodes toward the electroreduction of CO2 was investigated by linear sweep voltammetry and potentiostatic electrolysis in 1 M KHCO3 electrolyte at standard pressure and room temperature. The formate production was quantified by UV-visible spectrophotometry. The Faradaic efficiency for formate was larger than 90% for electrodes with electrochemical surface areas above 500 cm2 and it was attributed to an increase fraction of the [100] surfaces. The porous Pb film deposited at 4 mA cm-2 and 40 seconds proved to be a highly active and stable electrode, with a partial current density (jformate) of -7.5 mA cm-2 and a Faradaic efficiency of formate of 97% at an overpotential of -0.99 V after 6 hours of electrolysis.

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Publication details

The article was received on 25 Jul 2017, accepted on 07 Sep 2017 and first published on 07 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06528K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Selective electroreduction of CO2 to formate on 3D [100] Pb dendrites with nanometer-sized needle-like tips

    M. Fan, S. Garbarino, G. Botton, A. C. Tavares and D. Guay, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06528K

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