Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach

Song, T, Yan, M, Shi, Z, Atrens, A and Qian, M (2015) Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach. Electrochimica Acta, 164 288-296. doi:10.1016/j.electacta.2015.02.217


Author Song, T
Yan, M
Shi, Z
Atrens, A
Qian, M
Title Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach
Journal name Electrochimica Acta   Check publisher's open access policy
ISSN 0013-4686
1873-3859
Publication date 2015-05-10
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.electacta.2015.02.217
Open Access Status
Volume 164
Start page 288
End page 296
Total pages 9
Place of publication Kidlington, United Kingdom
Publisher Pergamon Press (Elsevier Science)
Collection year 2016
Language eng
Formatted abstract
Hierarchical (bimodal) porous copper (Cu) materials with micro- and nano-sized pores are desired for a wide variety of important applications. This study proposes an annealing-electrochemical dealloying approach for the creation of bulk bimodal porous Cu materials from an as-cast hypereutectic Al75Cu25 (at.%) precursor alloy, which consists of pre-eutectic CuAl2 and lamellar eutectic α-Al(Cu)-CuAl2. Annealing of the precursor alloy plays a critical role in the subsequent electrochemical dealloying for the creation of bimodal porous Cu. It decouples the lamellar eutectic structure and substantially increases the size of the α-Al(Cu) phase which determines the size of the subsequently produced micropores. In addition, it reduces the solubility of Cu in α-Al(Cu) and noticeably decreases the critical potential of the Al75Cu25 alloy thereby enabling more flexible electrochemical dealloying. A variety of bimodal porous Cu structures were produced using the proposed approach. The most homogeneous bimodal porous Cu structure with the average ligament width of 52 nm was produced by electrochemical dealloying of the annealed Al75Cu25 alloy at the applied potential of -0.5 V, which is above the critical potential of the α-Al(Cu) but below that of the CuAl2 phase. The influence of annealing on the microstructure and the subsequent electrochemical dealloying behaviours of the Al75Cu25 alloy was characterised and discussed in detail.
Keyword Annealing
Dealloying
Bimodal
Nanoporous
Microporous
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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