Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany.
Nanoscale. 2017 Nov 23;9(45):17839-17848. doi: 10.1039/c7nr05124g.
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 CHOH 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.
纳米多孔金（NPG）的性质可以通过其制备细节进行调整，特别是残余银含量与材料的连接体大小相关。我们将这种相关性与甲醇电氧化联系起来。具体来说，比较了两种不同的通过恒电位脱合金法得到的 NPG 与一种通过自由腐蚀得到的 NPG。它们在活性方面表现出显著的差异。定量产物分析表明，与平面 Au 相比，当 NPG 用作活性电极时，NPG 几乎可以选择性地将 CHOH 氧化为 HCOO。当应用与更高银含量相关的更精细的纳米多孔结构时，这种趋势可以进一步增强。X 射线光电子能谱（XPS）揭示了残余银性质的变化，我们由此得出结论，银不是甲醇氧化过程中的被动成分。
