Hydrogen desorption from LiBH4 destabilized by chlorides of transition metal Fe, Co, and Ni

✍ Scribed by Bang Jie Zhang; Bin Hong Liu

• Book ID: 103832373
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 878 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.04.165

✦ Synopsis

The dehydrogenation temperature of LiBH 4 was considerably decreased to 230 Ce300 C when it was manually mixed with FeCl 2 , CoCl 2 and NiCl 2 in a molar ratio of 2:1. Mixing LiBH 4 with NiCl 2 or FeCl 2 led to complete hydrogen desorption from LiBH 4 , i.e. 18.3 wt% hydrogen was achieved with respect to the weight of LiBH 4 . However, the CoCl 2 addition resulted in less hydrogen release due to the formation of diborane. Ball milling treatment for the mixtures of LiBH 4 and these chlorides further decreased hydrogen desorption temperatures. The results indicate that LiBH 4 could be effectively destabilized by the chlorides of Fe, Co and Ni. Small doping of these chlorides into LiBH 4 was found to be effective in enhancing dehydrogenation kinetics of the remaining LiBH 4 due to the formation of metal borides.