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Synergistic hydrogen generation from AlLi alloy and solid-state NaBH4 activated by CoCl2 in water for portable fuel cell
Authors:Mei-qiang Fan  Shu Liu  Li-Xian Sun  Fen Xu  Shuang Wang  Jian Zhang  De-sheng Mei  Fen-lei Huang  Qing-ming Zhang
Affiliation:1. Department of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, PR China;2. Materials and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China;3. Department of Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China;4. Department of Medicinal Chemistry, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, PR China;5. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China
Abstract:Solid-state AlLi/NaBH4 mixture activated by CoCl2 salt is fabricated for hydrogen generation via a milling process, providing uniform dispersion of AlLi alloy and CoCl2 salt among pulverized NaBH4 particles in order to improve NaBH4 hydrolysis through the contact of NaBH4 with active catalytic sites. The active catalytic sites come from Co2B loaded in Al(OH)3 (Bayerite) or LiAl2(OH)7 hydrate, generated from the reaction of CoCl2, AlLi alloy, and NaBH4 in water. The results show that the gravimetric hydrogen storage capacity is as high as 6.4 wt.% and an efficiency of above 90% in 30-min hydrolysis at 323 K could be achieved using the limited amount of water. The hydrogen generation amount and rate could be regulated by changing the composition, mixing style, mixture/water weight ratio, and hydrolysis temperature. The relative mechanism is explored.
Keywords:Hydrogen generation   AlLi alloy   Hydrolysis mechanism   NaBH4
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