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Co1-xNixB合金催化剂,研究了该系列合金不同Ni含量对NaBH4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Co1-xNixB合金是纳米非晶态颗粒.放氢测试表明Co1-xNixB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Co0.85Ni0.15B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Co0.85Ni0.15B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Co1-xNixB合金具有较高的催化活性.
A series of Co1-xNixB alloy catalysts were synthesized in ethanol by chemical reduction in an ice-water bath.The catalytic hydrolysis of an alkaline NaBH4 solution was studied by changing the Ni content in the Co1-xNixB catalyst.X-ray diffraction,scanning electron microscopy,and transmission electron microscopy revealed that the as-prepared Co1-xNixB alloys were ultrafine nanoparticles in amorphous form.Hydrogen generation measurements showed that the as-prepared Co1-xNixB alloys exhibited excellent catalytic activity.The hydrogen generation rate firstly increased as the Ni content increased in the Co1-xNixB catalyst,and it reached the highest at x=0.15,then decreased as x increased.The highest hydrogen generation rate at 298 K was 4228 mL·min-1·g-1 for Co0.85Ni0.15B during the catalytic hydrolysis of the alkaline sodium borohydride solution.The activation energies of the Co0.85Ni0.15B alloy and CoB were 31.87 and 34.25 kJ·mol-1,respectively.This showed that the Co1-xNixB alloys synthesized in ethanol had high activity.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2010年第6期1575-1578,共4页
Acta Physico-Chimica Sinica
基金
supported by the National High-Tech Research and Development Program of China(863)(2007AA05Z149,2007AA05Z108)
National Key Basic Research Program of China(973)(2010CB631303)
National Natural Science Foundation of China(50631020,50701025, 50971071)~~
