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Issue 12, 2018
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Morphology-controlled Au nanostructures for efficient and selective electrochemical CO2 reduction

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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 an electrochemical CO2 reduction reaction (CO2RR). First, we demonstrate the influence of electrochemical process parameters on the formation of Au nanostructures and Au(OH)3. The Au nanostructure morphologies can be tuned into either pore-like or pillar-like structures by controlling the 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 activity of the morphology-controlled Au nanostructures in the CO2RR. Both Au nanostructures exhibit significantly higher CO selectivity at a low overpotential than 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 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.

Graphical abstract: Morphology-controlled Au nanostructures for efficient and selective electrochemical CO2 reduction

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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, 2018,6, 5119-5128
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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, 6, 5119
    DOI: 10.1039/C8TA01010B

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