Issue 12, 2018

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 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

Supplementary files

Article information

Article type
Paper
Submitted
30 Jan 2018
Accepted
14 Feb 2018
First published
15 Feb 2018

J. Mater. Chem. A, 2018,6, 5119-5128

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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