Flexible Au micro-array electrode with atomic-scale Au thin film for enhanced ethanol oxidation reaction

Xun Cao; Dongdong Peng; Cao Wu; Yongmin He; Chaojiang Li; Bowei Zhang; Changcun Han; Junsheng Wu; Zheng Liu; Yizhong Huang

doi:10.1007/s12274-020-3090-4

Flexible Au micro-array electrode with atomic-scale Au thin film for enhanced ethanol oxidation reaction

Xun Cao, Dongdong Peng, Cao Wu, Yongmin He, Chaojiang Li, Bowei Zhang, Changcun Han, Junsheng Wu^*, Zheng Liu^*, Yizhong Huang^*

^*Corresponding author for this work

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The catalysis of Au thin film could be improved by fabrication of array structures in large area. In this work, nanoimprint lithography has been developed to fabricate flexible Au micro-array (MA) electrodes with ∼ 100% coverage. Advanced electron microscopy characterisations have directly visualised the atomic-scale three-dimensional (3D) nanostructures with a maximum depth of 6 atomic layers. In-situ observation unveils the crystal growth in the form of twinning. High double layer capacitance brings about large number of active sites on the Au thin film and has a logarithmic relationship with mesh grade. Electrochemistry testing shows that the Au MAs perform much better ethanol oxidation reaction than the planar sample; MAs with higher mesh grade have a greater active site utilisation ratio (ASUR), which is important to build electrochemical double layer for efficient charge transfer. Further improvement on ASUR is expected for greater electrocatalytic performance and potential application in direct ethanol fuel cell.[Figure not available: see fulltext.].

Original language	English
Pages (from-to)	311-319
Number of pages	9
Journal	Nano Research
Volume	14
Issue number	1
DOIs	https://doi.org/10.1007/s12274-020-3090-4
Publication status	Published - Jan 2021

Keywords

active site utilisation ratio
atomic-scale active sites
atomic-scale three-dimensional (3D) nanostructures
ethanol oxidation reaction
flexible electrode
in-situ observations

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10.1007/s12274-020-3090-4

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title = "Flexible Au micro-array electrode with atomic-scale Au thin film for enhanced ethanol oxidation reaction",

abstract = "The catalysis of Au thin film could be improved by fabrication of array structures in large area. In this work, nanoimprint lithography has been developed to fabricate flexible Au micro-array (MA) electrodes with ∼ 100% coverage. Advanced electron microscopy characterisations have directly visualised the atomic-scale three-dimensional (3D) nanostructures with a maximum depth of 6 atomic layers. In-situ observation unveils the crystal growth in the form of twinning. High double layer capacitance brings about large number of active sites on the Au thin film and has a logarithmic relationship with mesh grade. Electrochemistry testing shows that the Au MAs perform much better ethanol oxidation reaction than the planar sample; MAs with higher mesh grade have a greater active site utilisation ratio (ASUR), which is important to build electrochemical double layer for efficient charge transfer. Further improvement on ASUR is expected for greater electrocatalytic performance and potential application in direct ethanol fuel cell.[Figure not available: see fulltext.].",

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author = "Xun Cao and Dongdong Peng and Cao Wu and Yongmin He and Chaojiang Li and Bowei Zhang and Changcun Han and Junsheng Wu and Zheng Liu and Yizhong Huang",

note = "Publisher Copyright: {\textcopyright} 2020, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.",

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doi = "10.1007/s12274-020-3090-4",

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AU - Cao, Xun

AU - Peng, Dongdong

AU - Wu, Cao

AU - He, Yongmin

AU - Li, Chaojiang

AU - Zhang, Bowei

AU - Han, Changcun

AU - Wu, Junsheng

AU - Liu, Zheng

AU - Huang, Yizhong

PY - 2021/1

Y1 - 2021/1

N2 - The catalysis of Au thin film could be improved by fabrication of array structures in large area. In this work, nanoimprint lithography has been developed to fabricate flexible Au micro-array (MA) electrodes with ∼ 100% coverage. Advanced electron microscopy characterisations have directly visualised the atomic-scale three-dimensional (3D) nanostructures with a maximum depth of 6 atomic layers. In-situ observation unveils the crystal growth in the form of twinning. High double layer capacitance brings about large number of active sites on the Au thin film and has a logarithmic relationship with mesh grade. Electrochemistry testing shows that the Au MAs perform much better ethanol oxidation reaction than the planar sample; MAs with higher mesh grade have a greater active site utilisation ratio (ASUR), which is important to build electrochemical double layer for efficient charge transfer. Further improvement on ASUR is expected for greater electrocatalytic performance and potential application in direct ethanol fuel cell.[Figure not available: see fulltext.].

AB - The catalysis of Au thin film could be improved by fabrication of array structures in large area. In this work, nanoimprint lithography has been developed to fabricate flexible Au micro-array (MA) electrodes with ∼ 100% coverage. Advanced electron microscopy characterisations have directly visualised the atomic-scale three-dimensional (3D) nanostructures with a maximum depth of 6 atomic layers. In-situ observation unveils the crystal growth in the form of twinning. High double layer capacitance brings about large number of active sites on the Au thin film and has a logarithmic relationship with mesh grade. Electrochemistry testing shows that the Au MAs perform much better ethanol oxidation reaction than the planar sample; MAs with higher mesh grade have a greater active site utilisation ratio (ASUR), which is important to build electrochemical double layer for efficient charge transfer. Further improvement on ASUR is expected for greater electrocatalytic performance and potential application in direct ethanol fuel cell.[Figure not available: see fulltext.].

KW - active site utilisation ratio

KW - atomic-scale active sites

KW - atomic-scale three-dimensional (3D) nanostructures

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KW - in-situ observations

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Flexible Au micro-array electrode with atomic-scale Au thin film for enhanced ethanol oxidation reaction

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Keywords

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