Mg<sub>2</sub>(Co<sub>1/3</sub>Fe<sub>1/3</sub>Ni<sub>1/3</sub>), Mg<sub>2</sub>(Cu<sub>1/3</sub>Fe<sub>1/3</sub>Ni<sub>1/3</sub>), Mg<sub>2</sub>(Co<sub>1/3</sub>Cu<sub>1/3</sub>Fe<sub>1/3</sub>), Mg<sub>2</sub>(Co<sub>1/3</sub>Cu<sub>1/3</sub>Ni<sub>1/3</sub>), and Mg<sub>2</sub>(Co<sub>1/4</sub>Cu<sub>1/4</sub>Fe<sub>1/4</sub>Ni<sub>1/4</sub>) Materials for Hydrogen Storage
Hydrogen is a promising energy vector; however, its storage in solid-state materials is still an unresolved problem. Hydrogen storage on Mg-based materials is an ongoing research area. Here, five materials, Mg<sub>2</sub>(Co<sub>1/3</sub>Fe<sub>1/3</sub>Ni<sub&...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
|
| Series: | Inorganics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6740/13/5/135 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Hydrogen is a promising energy vector; however, its storage in solid-state materials is still an unresolved problem. Hydrogen storage on Mg-based materials is an ongoing research area. Here, five materials, Mg<sub>2</sub>(Co<sub>1/3</sub>Fe<sub>1/3</sub>Ni<sub>1/3</sub>), Mg<sub>2</sub>(Cu<sub>1/3</sub>Fe<sub>1/3</sub>Ni<sub>1/3</sub>), Mg<sub>2</sub>(Co<sub>1/3</sub>Cu<sub>1/3</sub>Fe<sub>1/3</sub>), Mg<sub>2</sub>(Co<sub>1/3</sub>Cu<sub>1/3</sub>Ni<sub>1/3</sub>), and Mg<sub>2</sub>(Co<sub>1/4</sub>Cu<sub>1/4</sub>Fe<sub>1/4</sub>Ni<sub>1/4</sub>), are reported for hydrogen storage. The hydriding and dehydriding reactions in these materials proceed via two steps. The first step is associated with the Mg/MgH<sub>2</sub> equilibrium, while the second step is related to the simultaneous formation of mixtures of hydrided Mg-intermetallics. All of the studied materials demonstrate easy hydriding in mild conditions (15 bar, 300 °C). Mg<sub>2</sub>(Co<sub>1/3</sub>Fe<sub>1/3</sub>Ni<sub>1/3</sub>) can be considered the best material among the studied series, with a hydrogen storage capacity of 3.8 wt. % and a dehydriding onset temperature of 243 °C. The presence of Cu modified the equilibrium pressure of the second hydriding step and induced partial dehydriding at 250 °C in pressure-composition isothermal testing. The presence of Fe favored the hydrogen uptake in the first hydriding reaction, from 0.5 wt. % at the material without Fe to 1.1–2.2 wt. % in the Fe materials. The elements Co, Co, Cu, and Fe demonstrated synergistic effects on hydriding/dehydriding reactions. |
|---|---|
| ISSN: | 2304-6740 |