Abstract
High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.
Highlights
High-entropy alloys (HEAs) are equimolar or near-equiatomic solid solution alloys with four or more elements [1,2]
It is reported that multicomponent noble metal solid solutions usually present broad but not very respectively
It is reported that multicomponent noble metal solid solutions usually present broad sharp peaks [17,18] compared with the traditional crystalline XRD patterns with sharp peaks
Summary
High-entropy alloys (HEAs) are equimolar or near-equiatomic solid solution alloys with four or more elements [1,2]. More and more influential work related to the fabrication, phase transformation, and mechanical properties of HEAs has been reported [5,6,7]. The chemical properties of HEAs have long been neglected due to the low specific surface area, limited by traditional synthesis methods. To help HEAs shine in broader chemical applications, it is important to develop various HEAs with new three-dimensional (3D) structures and a high specific surface area. Traditional methods for preparing porous metals cannot be mechanically duplicated to acquire nanoporous HEAs. to our knowledge, there has still been no report on the fabrication of nanoporous HEAs. Metals 2019, 9, x FOR PEER REVIEW microspheres melt-spinning and dealloying processes for the microspheres first time. The strategy opens the metalfor based quasi-HEAs, maynanoporous promote thenoble application of (quasi-)HEAs themay catalysis, sensor, door the fabrication of and various metal based quasi-HEAs,inand promote the and surface-enhanced. Application of (quasi-)HEAs inscattering the catalysis, sensor, and surface-enhanced Raman scattering fields
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