Hydrogen Affinity in Alloy Design
Author Information
Author(s): Nigutová Katarína, Oroszová Lenka, Molčanová Zuzana, Csík Dávid, Gáborová Katarína, Möllmer Jens, Lange Marcus, Saksl Karel
Primary Institution: Institute of Materials Research, Slovak Academy of Sciences
Hypothesis
Can the semi-empirical model of Griessen and Driessen predict the hydrogen absorption capacity of high-entropy alloys?
Conclusion
The study confirms that the designed high-entropy alloys exhibit negligible hydrogen absorption, demonstrating their potential for hydrogen storage applications.
Supporting Evidence
- The alloys were designed to have highly endothermic enthalpies of formation, which helps prevent hydrogen absorption.
- Experimental results showed a maximum hydrogen uptake of only 0.23 wt.% at 2 MPa and 175 °C.
- XRD analysis confirmed that the alloys maintained their structural integrity after hydrogen exposure.
Takeaway
The researchers made new types of metal alloys that don't absorb much hydrogen, which is important for safely storing hydrogen energy.
Methodology
The alloys were synthesized and tested for hydrogen absorption under controlled pressure and temperature conditions.
Limitations
The study does not address the enthalpy values of several important metals and metalloids, which could impact the findings.
Digital Object Identifier (DOI)
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