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(量比为3∶1)混合物在333 K时的产氢值达1540 mL/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.
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/NaB-H4 mixture (mass ratio of 3:l) 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 NaBH4hydrolysis.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.
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