Superior reversible hydrogen storage in eutectic LiBH4–KBH4 system via Ni–based catalysts synergized with graphene
Light metal borohydrides are promising candidates for solid–state hydrogen storage due to their high hydrogen storage capacities; however, the reversibility and kinetics of de/hydrogenation still require significant improvement. The present work focuses on the improvement of the hydrogen storage pro...
Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
|
| Series: | Materials Today Catalysis |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949754X25000183 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Light metal borohydrides are promising candidates for solid–state hydrogen storage due to their high hydrogen storage capacities; however, the reversibility and kinetics of de/hydrogenation still require significant improvement. The present work focuses on the improvement of the hydrogen storage properties of the eutectic borohydride system of LiBH4–KBH4 (Li/KBH4). A layered composite of graphene supported with ultrafine Ni3B nanoparticles (Ni3B/G) is designed and synthesized, which acts as catalyst and confinement carrier for Li/KBH4. Assisted with a heating of the mixture of Li/KBH4 and Ni3B/G to 110 °C in the molten state of Li/KBH4, an interlayer structure of graphene dispersed with Ni3B nanoparticles and sheet–like Li/KBH4 is constructed. The graphene effectively disperses Ni3B nanoparticles and confines the Li/KBH4 in its interlayers. The confinement of Li/KBH4 and the catalysis of Ni3B nanoparticles, assisted with the high thermal conductivity of graphene, contribute synergistically the hydrogen storage of Li/KBH4. The main dehydrogenation peak temperature of the system is lowered to 278 °C. The system can release 8.5 wt% H2 within 30 min at 350 °C. The capacity retention achieves 81.2 % after 50 cycles. DFT theoretical analysis shows that there is strong charge transfer interaction between Ni3B and LiBH4/KBH4, which destabilizes the [BH4]– structure and promotes the dehydrogenation. This work provides a new approach for the design of new structural LiBH4–based eutectic system with high capacity, low dehydrogenation temperature, high reversibility and long cycling life. |
|---|---|
| ISSN: | 2949-754X |