Fe-based metallic glasses as efficient oxygen scavengers

Area of Science:

• Materials Science
• Chemical Engineering
• Catalysis

Background:

• Oxygen presence causes degradation and unwanted side reactions in materials.
• Current oxygen scavengers have low efficiency and capacity, leading to resource waste.
• There is a critical need for advanced oxygen scavenging solutions in various industries.

Purpose of the Study:

• To develop and characterize novel, high-performance oxygen scavengers.
• To investigate the mechanism behind the enhanced oxygen scavenging activity of Fe-based metallic glasses.
• To explore the potential of these materials for applications in materials preservation and catalysis.

Main Methods:

• Synthesis and characterization of Fe-based metallic glasses (FeSiB).
• Measurement of oxygen removal rates and capacities.
• Density Functional Theory (DFT) calculations to elucidate the scavenging mechanism.
• Analysis of microdomain formation and autocatalytic cycling.

Main Results:

• Fe-based metallic glasses exhibit oxygen removal rates 1-4 orders of magnitude higher than conventional scavengers.
• FeSiB metallic glass achieved a 24-hour oxygen removal capacity of 1.439 L g^-1, reaching the theoretical limit.
• A 48-hour capacity of 1.596 L g^-1 surpassed the theoretical limit, indicating exceptional performance.
• DFT calculations revealed that the amorphous structure lowers the oxygen adsorption energy barrier and facilitates O-O bond cleavage.

Conclusions:

• Fe-based metallic glasses represent a significant advancement in oxygen scavenging technology.
• The unique amorphous structure and autocatalytic cycling mechanism contribute to their superior performance.
• These materials offer a promising strategy for precise oxygen control and potential catalytic applications.