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Morphology-controlled Au Nanostructures for Efficient and Selective Electrochemical CO2 Reduction

Abstract

Electrochemical conversion of CO2 has been considered as a promising method for producing value-added chemicals. Here, we report a systematic study on the formation of Au nanostructures via electroreduction of anodic Au(OH)3 for selective CO production by electrochemical CO2 reduction reaction (CO2RR). Firstly, we demonstrate the influence of electrochemical process parameters on the formation of Au nanostructures and the Au(OH)3. The Au nanostructure morphologies can be tuned into either pore-like or pillar-like structures by controlling anodic potential and/or reduction current density. This distinctive morphology is associated with the electric-field-assisted transport of Au3+ at/near the Au(OH)3/Au interface. Additionally, we report the catalytic activty of the morphology-controlled Au nanostructures in CO2RR. Both nanostructured Au exhibit significantly higher CO selectivity at a low overpotential than that of the untreated Au film due to the high density of grain boundaries which can assist with faster stabilization of the CO2•- intermediate. In particular, the pore-like structures have a higher CO selectivity than that of the pillar-like ones at 280 mV overpotential although the pillar-like Au nanostructures have a higher CO selectivity and CO producing current density at high overpotentials. This potential-dependent CO2RR performance of the two different Au nanostructures is discussed.

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Publication details

The article was received on 30 Jan 2018, accepted on 14 Feb 2018 and first published on 15 Feb 2018


Article type: Paper
DOI: 10.1039/C8TA01010B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Morphology-controlled Au Nanostructures for Efficient and Selective Electrochemical CO2 Reduction

    J. Kim, J. T. Song, H. Ryoo, J. Kim, S. Chung and J. Oh, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01010B

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