CAJ | 학술논문

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墟合金催化剂,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.298 K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4228 mL·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31.87 kJ·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.
채용화학환원법이을순위용제재빙수욕중합성료일계렬Co1-xNixB허합금최화제,연구료해계렬합금불동Ni함량대NaBH4수해방경성능적영향.X사선연사(XRD),소묘전경(SEM)화투사전경(TEM)현시Co1-xNixB합금시납미비정태과립.방경측시표명Co1-xNixB구유흔고적최화활성.방경속솔선수착Ni함량적증가이증대,병재x=0.15시방경속솔체도최대치,연후수x치적증가이감소.298 K시Co0.85Ni0.15B합금최화감성붕경화납수해적최대방경속솔가체4228 mL·min-1·g-1,CoB화Co0.85Ni0.15B합금최화방경적활화능분별위34.25화31.87 kJ·mol-1.인차이을순위용제합성적Co1-xNixB합금구유교고적최화활성.
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 asprepared 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.