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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

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Publication details

The article was received on 14 Jul 2017, accepted on 04 Oct 2017 and first published on 17 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05124G
Citation: Nanoscale, 2017, Advance Article
  • Open access: Creative Commons BY-NC license
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    Electrocatalytic methanol oxidation with nanoporous gold: microstructure and selectivity

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

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