Evolution of 3D nanoporosity and morphology in selectively dealloying ternary Au₅₅Cu₂₅Si₂₀ metallic glass ribbon with enhanced alcohol electro-oxidation performance

Abstract

A chemical dealloying process for ternary Au55Cu25Si20 metallic glass ribbon is reported.

A Self‐Supported High‐Entropy Metallic Glass with a Nanosponge Architecture for Efficient Hydrogen Evolution under Alkaline and Acidic Conditions

“…Recently, metallic glass (MG) ribbons, with their unique short‐range ordered and long‐range disordered atomic structures, have garnered considerable interest for catalytic applications on their own merits. [ 16 ] Their multicomponent nature, chemical homogeneity, high atomic diffusivity, metastable nature, and excellent mechanical properties offer great potential as nanoporous catalysts, such as has been reported for the NiZrTi, [ 17 ] PdNiP, [ 18 ] PdCuNi, [ 19 ] PtNiCuP, [ 20 ] and AuCuSi [ 21 ] MGs. While tremendous research progress has been made using traditional MG compositional designs, the fabrication of nanoporous architectures through chemical dealloying is in fact limited by their single principal component design (i.e., other elements are minorly alloyed).…”

Metal‐Free B, N co‐Doped Hierarchical Porous Carbon Electrocatalyst with an Excellent O2 Reduction Performance

“…Nitrogen adsorption/desorption isotherms were conducted to analyze the pore structure characteristics (e. g., specific surface area, pore volume and pore size distribution) of the obtained composites. The surface area and microporosity/mesoporosity have significant effect upon the electron migration, the reaction site exposure, the O 2 adsorption and reduction in ORR process [33–36] . The N 2 adsorption isotherms of the obtained composites exhibit typical I–IV hybrid isotherms at −196 °C according to the IUPAC classification (Figure 3), suggesting that they are typical micro‐mesoporous materials [37] .…”

Nanoporous Dealloyed Metal Materials Processing and Applications─A Review

“…6,27 Sacrificial metal atoms may also diffuse across the rearranging noble metal atom phase and remain trapped within the crystalline structure, in a core−shell type structure. 32,34 In situ crystallographic analysis on the dealloying process of nanoporous gold has shown evidence that the morphology change is directly related to the noble metal atoms rearrangement and that pockets of alloys or of richer sacrificial metal elements may remain present within the bulk of the ligaments, although the surface is composed exclusively of the target noble metal material. 29,30 Interestingly, if the dissolving rate of noble metal atoms is faster than their reprecipitation rate, the sacrificial metal atoms could be retained at the end of the process, leading to reprecipitation within the pores or onto the surface of the porous structure.…”