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Compelling Rejuvenated Catalytic Performance in Metallic Glasses
Shun-Xing Liang1, Zhe Jia2, Yu-Jing Liu3
1School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia.
Advanced Materials (Deerfield Beach, Fla.)
|October 3, 2018
Summary
Fully crystallized iron-based metallic glasses (MGs) exhibit enhanced catalytic activity. This rejuvenation stems from galvanic cells formed by multiphase intermetallics, promoting efficient electron transport and surface site refreshment for pollutant degradation.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Metallic glasses (MGs) show promise in catalysis due to their unique atomic structure.
- Crystalline materials often have limitations in catalytic activity owing to ordered structures and fewer active sites.
- Understanding the catalytic mechanisms of MGs and their crystalline counterparts is crucial for advancing their applications.
Purpose of the Study:
- To investigate the catalytic behavior of iron-based metallic glasses (MGs) and their crystalline forms.
- To elucidate the underlying mechanisms responsible for catalytic activity changes during crystallization.
- To explore the potential of fully crystallized alloys as novel catalysts.
Main Methods:
- Synthesis and characterization of Fe-based metallic glasses and their partially and fully crystallized counterparts.
- Evaluation of catalytic performance in hydrogen peroxide activation and organic pollutant degradation.
- Analysis of microstructural evolution and surface properties post-catalysis.
Main Results:
- Partial crystallization of MGs detrimentally affects catalytic behavior.
- Full crystallization leads to a significant rejuvenation of catalytic activity.
- Fully crystallized alloys form galvanic cells due to multiphase intermetallics, enhancing electron transport and surface site regeneration.
Conclusions:
- The catalytic efficiency of Fe-based MGs is strongly dependent on their crystalline state.
- Fully crystallized alloys offer superior catalytic performance through mechanisms involving galvanic coupling and improved electron dynamics.
- This study provides critical insights into designing advanced catalysts based on the crystalline forms of metallic glasses.
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