Electrochemical dealloying as a tool to tune the porosity, composition and catalytic activity of nanomaterials

Abstract

Electrochemical dealloying as a post-treatment can greatly improve the catalytic activity of nanoparticles. To date, selecting suitable conditions to reach desired porosity, composition and catalytic activity is based on trial-and-error-attempts,...

Quantitative 3D Characterization of Nanoporous Gold Nanoparticles by Transmission Electron Microscopy

“…Uncorroded particles (marked in blue) are very rare to find. In literature, samples were reported where porous particles were found in the direct vicinity of solid and dense particles (Rurainsky et al, 2020). The authors claim statistic fluctuations in both, initial Ag distributions in the alloyed particles and surface diffusion of Au atoms during dealloying as the major reasons.…”

“…Below this threshold core–shell structures form with a core enriched in the less noble metal and a shell rich in the noble metal. A further result of AgAu NP corrosion is that although a significant amount of Ag is removed, particles become only slightly smaller (Rurainsky et al, 2020).…”

Single-Particle Hyperspectral Imaging Reveals Kinetics of Silver Ion Leaching from Alloy Nanoparticles

“…72 Specifically, passivation to leaching has previously been attributed to gold-rich layers on the surface, which form as the lattice rearranges. 71,93 In the case of gold−silver alloy films, whether or not a passivation layer is formed depends on the leaching rate: when the silver is leached out of the alloy quickly enough that emerging pores are not filled by surface lattice diffusion, the pores allow percolation of lixiviant into the alloy and complete leaching is possible. 72,86 However, when silver is leached more slowly, pores are filled and no percolation is possible.…”

In‐Liquid Plasma for Surface Engineering of Cu Electrodes with Incorporated SiO2 Nanoparticles: From Micro to Nano

“…[29,30] In contrast, electrochemical approaches afford an alternative route for tailoring the electrode surface structure. [31][32][33][34][35] More specifically, self-organization and self-assembly processes at the exposed metal surface induced by surface stress are very effective strategies to facilitate the fabrication of unique micro/nanostructures and metamaterials. [36][37][38][39] In other words, the application of a self-organization tool to fabricate microand nanostructures allows controlling the growth of a defined crystalline structure, chemical composition, and the specific surface area of the obtained materials.…”