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Plasmonic-Enhancement of the Electro-Oxidation of Ethanol in Alkaline Media with Au-Fe2O3 Thin Film, Embedded, Sandwich and Surface Configurations

Published online by Cambridge University Press:  23 May 2017

Joshua P. McClure ,
Kyle N. Grew ,
Naresh C. Das ,
Deryn Chu ,
David Baker ,
Nicholas Strnad  and
Eric Gobrogge
Joshua P. McClure*
Affiliation:
U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD, 2800 Powder Mill Road, Adelphi, MD 20783, U.S.A.
Kyle N. Grew
Affiliation:
U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD, 2800 Powder Mill Road, Adelphi, MD 20783, U.S.A.
Naresh C. Das
Affiliation:
U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD, 2800 Powder Mill Road, Adelphi, MD 20783, U.S.A.
Deryn Chu
Affiliation:
U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD, 2800 Powder Mill Road, Adelphi, MD 20783, U.S.A.
David Baker
Affiliation:
U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD, 2800 Powder Mill Road, Adelphi, MD 20783, U.S.A.
Nicholas Strnad
Affiliation:
U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD, 2800 Powder Mill Road, Adelphi, MD 20783, U.S.A.
Eric Gobrogge
Affiliation:
U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD, 2800 Powder Mill Road, Adelphi, MD 20783, U.S.A.
*
*(Email: [email protected])
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Abstract

This paper highlights experimental and theoretical efforts dedicated to developing plasmonic-enhanced electrodes for the photo-electrochemical ethanol oxidation reaction (EOR) at room temperature in alkaline media. However, decoupling the electrocatalytic dark response from the plasmon-enhanced improvement presents a difficult challenge. To understand the plasmonic-enhancement of the photo-electrochemical EOR, multiple Au-Fe2O3 were fabricated and evaluated in parallel with discrete dipole approximation (DDA) modeling. Different Au-Fe2O3 were synthesized with Au nanoparticles located at variable positions within and/or on the Fe2O3 layer(s). The configurations investigated include thin film, embedded, surface and sandwich layered electrodes to facilitate optimal electrode design considerations for plasmonic-enhancement. The design strategies and configurations were guided by DDA simulations to assess absorption, scattering, and near-field enhancements within or near the semiconductor band edge, as well as the solution/electrode interface. For the different Fe2O3 loadings and Au nanoparticle sizes/distributions considered, it is determined that the Au-Fe2O3 surface configurations significantly enhanced the EOR in terms of a large positive current density enhancement, an increased photo-voltage and a lower onset potential relative to the other electrode designs.

Keywords

photochemicalethanolnanostructure
Type
Articles
Information
MRS Advances , Volume 2 , Issue 55: Energy Storage and Conversion , 2017 , pp. 3397 - 3402
Copyright
Copyright © Materials Research Society 2017 

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References

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