Hierarchical porous copper materials: fabrication and characterisation

Abstract

Hierarchical porous copper bulk can be fabricated through chemical dealloying of porous CuAl intermetallics under free corrosion conditions. The obtained precursor porous CuAl intermetallics and as-dealloyed hierarchical porous copper were characterised using X-ray diffraction, a field-emission scanning electron microscope and energy dispersive X-ray spectroscopy. It was found that the hierarchical porous copper can be easily prepared by this method. The dealloying solution will dramatically influence the morphology of the resultant hierarchical porous materials. As a result, trimodal porous copper composite material and bimodal porous copper can be achieved after being dealloyed in NaOH and HCl solutions, respectively. Therefore, the mechanisms of the evolution of hierarchical pores structure are also discussed.

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

“…It is reported that the Al 4 Cu 9 phase is less susceptible to an alkaline environment compared to an acid environment. 35 Thus it is reasonable to recognize that Al 4 Cu 9 would take up a higher proportion in the residue aer the depletion of Al and Al 2 Cu and can consequently be detected as shown in Fig. 5d.…”

“…[28][29][30][31][32][33] However, compared with widely studied ribbons and lms, precursors prepared through a sintering method are still less studied. 34,35 In this work, Al x Cu (100Àx) (x ¼ 60, 67 and 85 at%) alloy precursors were prepared through cold-press sintering followed by dealloying in an alkali solution under free corrosion conditions. The effects of the sintering parameters on precursors (Al 67 Cu 33 ) and products are studied in detail.…”

Ligament Evolution in Nanoporous Cu Films Prepared by Dealloying

“…For the dealloying experiments, electrolytes of 0.1 M for HCl and 1.3 M for NaOH were chosen to compare our results with those in the literature. 13,26,27 Apart from the comparability, the ionic strength of the solutions is strong enough to entirely dissolve the Zn from the alloyed film in a proper dealloying time.…”

“…Considering the respective potential shift for hydrogen evolution at pH 1 and pH 14, the electrochemical Zn oxidation is thermodynamically favored in acidic environment than that in alkaline. For the dealloying experiments, electrolytes of 0.1 M for HCl and 1.3 M for NaOH were chosen to compare our results with those in the literature. ,, Apart from the comparability, the ionic strength of the solutions is strong enough to entirely dissolve the Zn from the alloyed film in a proper dealloying time.…”

Porous gold with three-level structural hierarchy

“…Special physicochemical properties of materials are associated with their structural hierarchy, such as the super-hydrophobic nature of lotus leaves and structural color of butterfly wings ( Song et al., 2018 ; Yang et al., 2017 ). In recent years, great advances have been achieved in design, fabrication, and application of hierarchically structured materials ( Juarez et al., 2017 ; Kong et al., 2013 ; Nyce et al., 2007 ; Parlett et al., 2013 ; Qiu et al., 2015 ; Shi et al., 2017 ; Sun et al., 2016 ; Zhang et al., 2019 ). For example, Zhang et al.…”