Ultrafine Amorphous Co–Fe–B Catalysts for the Hydrolysis of NaBH4 Solution to Generate Hydrogen for PEMFC
✍ Scribed by Y. P. Wang; Y. J. Wang; Q. L. Ren; L. Li; L. F. Jiao; D. W. Song; G. Liu; Y. Han; H. T. Yuan
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 732 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1615-6846
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✦ Synopsis
For hydrogen generation from alkaline sodium borohydride (NaBH 4 ) solution, Co-Fe-B catalysts with different Co/ (Co + Fe) molar ratios (v Co ) were prepared by the chemical reduction of CoCl 2 and FeCl 3 ethanol solution with KBH 4 solution. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses revealed that the as-prepared Co-Fe-B catalysts were in amorphous form and ultrafine. The hydrogen generation measurements showed that asprepared Co-B and Co-Fe-B catalysts exhibited excellent catalytic activity. Co-Fe-B with the Co/(Co + Fe) molar ratio (v Co ) of 0.85 was the best. Its maximum hydrogen gen-eration rate at 298 K was 4,310 mL min -1 g -1 , while the Co-B was 2,773 mL min -1 g -1 . The enhanced activity could be attributed to large active surface area, electron transfer from B and Fe to active Co sites, and improvement in the dispersion of Co-B with Fe 2 O 3 . The activation energy of Co-Fe-B catalyst with the molar ratio v Co = 0.85 was decreased to 29.09 kJ mol -1 as compared to 30.85 kJ mol -1 obtained with Co-B.