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Issue 45, 2017

Electrocatalytic methanol oxidation with nanoporous gold: microstructure and selectivity

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Abstract

The properties of Nanoporous Gold (NPG) obtained by the selective dissolution of Ag from an Au–Ag alloy can be tuned by the details of its fabrication, and specifically the residual Ag content is correlated to the ligament size of the material. We link this correlation to methanol electro-oxidation. Specifically, two different NPG types (obtained by potentiostatic dealloying) are compared with one obtained by free corrosion. They show remarkable differences in activity. Quantitative product analysis reveals that NPG shows nearly selective oxidation of CH3OH to HCOO when NPG is used as an active electrode in contrast to planar Au. This trend can further be enhanced when applying finer nanoporous structures that are linked to a higher Ag content. X-ray photoelectron spectroscopy (XPS) reveals changes in the nature of residual Ag from which we conclude that Ag is not a passive component in the methanol oxidation process.

Graphical abstract: Electrocatalytic methanol oxidation with nanoporous gold: microstructure and selectivity

Supplementary files

Article information


Submitted
14 Jul 2017
Accepted
04 Oct 2017
First published
17 Oct 2017

This article is Open Access

Nanoscale, 2017,9, 17839-17848
Article type
Paper

Electrocatalytic methanol oxidation with nanoporous gold: microstructure and selectivity

M. Graf, M. Haensch, J. Carstens, G. Wittstock and J. Weissmüller, Nanoscale, 2017, 9, 17839 DOI: 10.1039/C7NR05124G

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