A5016108754- Nanoporous metals and alloys
- Electrocatalysts for Energy Conversion
- Anodic Oxide Films and Nanostructures
- Supercapacitor Materials and Fabrication
- Corrosion Behavior and Inhibition
- Electrochemical Analysis and Applications
- Nanocluster Synthesis and Applications
Hamburg University of Technology
2017-2023
Universität Hamburg
2017-2023
The suggestion, based on atomistic simulation, of a surface-induced tension-compression asymmetry the strength and flow stress small metal bodies so far lacks experimental confirmation. Here, we present missing evidence. We study transverse plastic nanoporous gold under uniaxial compression. Performing mechanical tests in electrolyte affords control over surface state. Specifically, tension, γ, can be varied situ during flow. find that decreasing γ leads to an increase effective macroscopic...
Nanoporous gold (NPG) made by dealloying takes the form of a network nanoscale struts or "ligaments". It is well established that material's mechanical behavior strongly affected its ligament size, L and solid volume fraction, φ. We explore NPG, with an emphasis on establishing consistent data set comparable but covering significant range initial Specimens are prepared from Ag-Au master alloys their Au atom xAu0 in 0.20–0.35. Since replaces Ag voids, φ may be expected to agree xAu0. Yet,...
Nanoporous gold (NPG) obtained by dealloying Ag75Au25 with an overall residual Ag content of less than 1% was investigated as electrocatalyst for the oxidation methanol, formaldehyde, and formate in aqueous 0.1 M NaOH solution. The NPG used to fill cavity microelectrodes, which allowed recording well-resolved voltammetry from porous material. differs polycrystalline Au (Au(poly)) its microstructure also behaves distinctly different Au(poly). is higher at surface ligaments bulk. By cycling...
Abstract The analysis of the densification behavior nanoporous metals in nanoindentation is challenging simulations and experiments. A deeper understanding provides valuable information about different deformation mechanisms compression developed two-scale model allows for predicting field variable microstructure elastic–plastic behavior. It could be shown that penetration depth mainly controlled by ratio macroscopic work hardening rate to yield stress. shape as well value at characteristic...
Abstract The electrochemical behavior of nanoporous gold (NPG) obtained by dealloying a AgAu alloy has been investigated means cyclic voltammetry (CV) in 0.1 M H 2 SO 4 and KOH solutions supplemented X‐ray photoelectron spectroscopy (XPS) scanning electron microscopy (SEM) order to understand different effects the treatment on development surface structure NPG. In reduce IR drop caused high area bicontinuous network pores ligaments NPG, NPG was transformed powder, from which small portion...
Nanoporous gold (NPG) obtained by potentiostatic dealloying of an AuAg master alloy was pulverized, filled into a cavity microelectrode and its surface electrochemistry investigated in NaOH KOH solutions. This method yielded highly resolved undistorted voltammograms this polycrystalline material with clear evidences for segregation Ag during storage air. One cycle 0.1 M H2SO4 can remove most the residual from as evidenced voltammetry after back transfer to alkaline solution X-ray...
ADVERTISEMENT RETURN TO ISSUEPREVCorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to "Promoting Effect of the Residual Silver on Electrocatalytic Oxidation Methanol and Its Intermediates Nanoporous Gold"Alex Ricardo Silva OlayaAlex OlayaMore by Alex Olayahttps://orcid.org/0000-0003-2915-6618, Franziska KühlingFranziska KühlingMore Kühlinghttps://orcid.org/0000-0001-7522-2845, Christoph MahrChristoph MahrMore Mahrhttps://orcid.org/0000-0003-1872-8887, Birthe...