Work

Formation of Nanoporous Copper with Hybrid-Modal Pore Size Distributions Related to Surface Diffusion of Copper Atoms During Dealloying of Mg 13.5 at.% Cu Alloy in an Acidic Solution

Year: 2012

Type: article

Abstract: Nanoporous copper (NPC) ribbons with hybrid-modal pore size distributions can be facilely fabricated by effectively controlling the surface diffusivity of Cu atoms during chemical dealloying of dual-phase Mg 13.5 at.% Cu alloy with quasieutectic structures in the HCl solution. These NPC ribbons can be featured by a combination of ligament-pore structures with unimodal pore size distributions at superficial layers and those with bimodal pore size distributions in the interior composed of interconnected large-sized pores with highly porous pore walls. All pores in the ligament-pore structures with unimodal and bimodal pore size distributions are 3D, open and bicontinuous. The formation of the novel NPC ribbons can be well explained as a consequence of the greater diffusivity of Cu atoms at the superficial layers induced by the higher absorbed Cl- concentration. According to the ligament sizes, the surface diffusivity of Cu atoms at the superficial layers can be evaluated as 1.68×10-16 m2 s-1, which is two orders of magnitude greater than that in the interior of the NPC ribbons (3.55×10-19 m2 s-1).

Source: International Journal of Electrochemical Science

DOI: 10.1016/s1452-3981(23)19487-9

Authors: Wenbo Liu, Shichao Zhang, Ning Li, Jiwei Zheng, Shenshen An, Yalan Xing

Institutions: Sichuan University, Beihang University

Language: English

Topic: Nanoporous metals and alloys

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,670