Effect of Ni Content in Co_1-<em>x</em>Ni_xB Catalysts on Hydrogen Generation during Hydrolysis

Abstract

摘要：采用化学还原法以乙醇为溶剂在冰水浴中合成了一系列 Co 1-x Ni x B 合金催化剂, 研究了该系列合金不同 Ni 含量对 NaBH 4 水解放氢性能的影响.X射线衍射(XRD), 扫描电镜(SEM)和透射电镜(TEM)显示 Co 1-x Ni x B 合 金是纳米非晶态颗粒. 放氢测试表明 Co 1-x Ni x B 具有很高的催化活性. 放氢速率先随着 Ni 含量的增加而增大, 并 在 x=0.15 时放氢速率达到最大值, 然后随 x 值的增加而减小.298K时Co 0.85 Ni 0.15 B 合金催化碱性硼氢化钠水解 的最大放氢速率可达 4228mL•min-1 •g-1 ,CoB 和 Co 0.85 Ni 0.15 B 合金催化放氢的活化能分别为 34.25 和 31.87kJ• mol-1. 因此以乙醇为溶剂合成的 Co 1-x Ni x B 合金具有较高的催化活性.

Nanocrystalline cobalt–nickel–boron (metal boride) catalysts for efficient hydrogen production from the hydrolysis of sodium borohydride

“…However, it is known that obtaining these alloys in crystalline form or in smaller nanoparticle sizes, would greatly increase the catalytic performance [12]. In a previous study that analyzed the catalytic effect of Co1-xNixB alloys during NaBH4 hydrolysis, it was determined that the maximum hydrogen generation rate was reached when x = 0.15 [29].…”