Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (06): 1575-1578.doi: 10.3866/PKU.WHXB20100609

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Effect of Ni Content in Co1-xNixB Catalysts on Hydrogen Generation during Hydrolysis

LI Li, WANG Yi-Jing, WANG Ya-Ping, REN Qiu-Li, JIAO Li-Fang, YUAN Hua-Tang   

  1. Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University, Tianjin 300071, P. R. China
  • Received:2009-12-21 Revised:2010-02-22 Published:2010-05-28
  • Contact: WANG Yi-Jing E-mail:wangyj@nankai.edu.cn

Abstract:

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.

Key words: Catalyst, Sodiumborohydride, Hydrolysis, Co1-xNixB alloy, Hydrogen generation

MSC2000: 

  • O643