Tailored Dealloying Products of Cu-based Metallic Glasses in Hydrochloric Acid Solutions

Abstract

Free dealloying of Cu-Hf-Al metallic glasses in HCl electrolytes are studied in this paper. The results show that the electrolyte concentration and dealloying time strongly influence the type of dealloying products. A superficial dealloying happens in diluted HCl electrolytes while a complete dealloying occurs in concentrated HCl electrolytes. The results present that Cu 2 O microparticles with regular morphology can be tailored on glassy surfaces in 0.05 M HCl solution by controlling the dealloying time. Furthermore, the designable products of nanoporous Cu, Cu 2 O nanoplates and CuO microwires can be fabricated in 1.2 M HCl electrolyte with the dealloying time. Due to a big difference of examined Cu-Hf-Al alloys in the electrolyte concentration and dealloying time, one or mixed dealloying products (Cu, Cu 2 O and CuO), which depend on the progress of relative chemical reactions and the different dealloying route, will finally be produced.

Tailored products of dealloying as-sintered Al–Cu alloys in sodium hydroxide solutions

“…Qin et al adopted Al-Cu-Hf amorphous alloys as precursors and mixed Cu/Cu 2 O/CuO were synthesized through dealloying in acid solutions. 20,21 Aburada et al 22 also produced hybrid Cu/Cu 2 O by dealloying an amorphous Al-Cu-Mg alloy in HCl solution. In addition, porous CuO nanoplates were also nally fabricated by dealloying an amorphous Al-Cu alloy lm and during that period a Cu 2 O intermediate was found.…”

Dealloying of Cu-Based Metallic Glasses in Acidic Solutions: Products and Energy Storage Applications

“…Using the salutary experience of this route, we found that various and regular Cu 2 O particles can also be fabricated on surfaces of MGs by dealloying Cu-based MG ribbons in the HCl solution with low concentrations for different times. For example, by dealloying Cu 52.5 Hf 40 Al 7.5 MG ribbons in 0.05 M diluted HCl solution for 4 h, 5 h, 6 h, 8 h, 14 h, 20 h and 24 h, Cu 2 O crystals with truncated tetrahedron, cube, cuboctahedron, truncated octahedron, octahedron, hexapod and octahedron-detached hexapod shapes [ 32 , 33 ] were synthesized, respectively. So, regular Cu 2 O particles with designable morphology can be tailored in the diluted HCl solution by simply controlling dealloying time.…”

“…As we know, the cost must be taken into account for practical commercial application of the dealloyed products. Recently, a new series of dealloyed products including nanoporous Cu (NPC) and nano/micro-Cu oxides with low cost and unique properties have been developed in our group [ 30 , 31 , 32 , 33 , 34 ]. This paper presents an overview of our recent advancement of dealloyed products via free-dealloying Cu-based metallic glasses (MGs) in hydrofluoric acid (HF) and hydrochloric acid (HCl) solutions, as well as a brief review of others’ results related to dealloying.…”

The Preparation and Catalytic Performance of Nanoporous CuO/CeO<sub>2</sub> Composites

“…As far as I know, monolithic nanoporous CuO/CeO 2 composites prepared by dealloying coupled with calcination treatment have not been reported so far. In our present work, we take a more effective and controllable approach to prepare nanoporous metals, which is dealloying [9]. The objective is aimed at developing a high-performance catalyst and gain a better understanding of the interfacial interaction between transition metals and CeO 2 while studying their catalytic activity in low temperature CO oxidation.…”