Rehydrogenation and cycle studies of LiBH4–CaH2 composite

✍ Scribed by Jae-Hag Lim; Jae-Hyeok Shim; Young-Su Lee; Jin-Yoo Suh; Young Whan Cho; Joonho Lee

• Book ID: 103832300
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 614 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.04.046

✦ Synopsis

Rehydrogenation behavior of 6LiBH 4 þ CaH 2 composite with NbF 5 has been studied between 350 and 500 C after dehydrogenation at 450 C. The composite exhibits the best rehydrogenation feature at 450 C in terms of the overall rehydrogenation rate and the amount of absorbed hydrogen. It is found that about 9 wt% hydrogen is absorbed at 450 C for 12 h. Up to 10 dehydrogenationehydrogenation cycles have been carried out for the composite. It is demonstrated that 6LiBH 4 þ CaH 2 with 15 wt% NbF 5 maintains a reversible hydrogen storage capacity of about 6 wt% at 450 C after a slight degradation between the 1st and 5th cycles. The addition of NbF 5 seems to improve the cycle properties by retarding microstructural coarsening during cycles.