Hydrogen generation from coupling reactions of AlLi/NaBH_4 mixture in water activated by Ni powder  

金属Ni掺杂催化AlLi/NaBH_4混合体系水解析氢(英文)

作　　者：刘姝[1] 王亮亮[1] 姚钧[1] 孙文强[1] 范美强[1] 

机构地区：[1]中国计量学院材料科学与工程学院,杭州310018

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第5期1140-1145,共6页中国有色金属学报（英文版）

基　　金：Projects (21003112, 21003111) supported by the National Natural Science Foundation of China;Project (Y4090507) supported by the Zhejiang Basic Research Program, China

摘　　要：A novel composition of AlLi/NaBH4 mixture activated by common Ni powder in water for hydrogen generation was investigated. The composition presents good hydrogen generation performance and an optimized Al-10% Li-10% Ni/NaBH4 mixture （mass ratio of 3：1） generates 1540 mL/g hydrogen with 96% efficiency at 333 K. Ni powder exhibits dual catalytic effects on the hydrolysis of AlLi/NaBH4 mixture due to the formation of Ni2B in the hydrolysis process. The Ni2B deposited on aluminum surface could act as a cathode of a micro galvanic couple. Ni2B/Al（OH）3 also has a synergistic effect on NaBH4 hydrolysis. Good hydrogen generation performance with stable pH value of hydrolysis byproduct Al（OH）3/NaBO2-2H2O was obtained with successive additions of Al-Li-Ni /NaBH4 mixture into fixed water.采用机械球磨法制备AlLi/NaBH4/Ni混合体系。水解测试分析表明,固态Al-Li-Ni/NaBH4混合物具有良好的析氢性能。Al-10%Li-10%Ni/NaBH4(质量比为3:1)混合物在333K时的产氢值达1540mL/g,产氢效率为96%。通过XRD、SEM等分析Ni掺杂改善其水解析氢机制,金属Ni的产物Ni2B对Al合金和NaBH4的水解具有双重催化作用。Ni2B沉积在Al表面可作为微型腐蚀电池的阴极并促进铝的阳极腐蚀。另外,Ni2B/Al(OH)3对NaBH4的水解动力学具有很好的催化作用。连续水解测试结果显示:水解产物Al(OH)3/NaBO2·2H2O具有稳定的pH值,Al-Li-Ni/NaBH4混合物具有很好的水解动力学。

关 键 词：hydrogen generation AlLi alloy NABH4 NI 

分 类 号：O643.32[理学—物理化学]