Preparation and characterization of Co-B flowers with mesoporous structure
Preparation and characterization of Co-B flowers with mesoporous structure
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DOI：
10.1016/j.materresbull.2007.05.021
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发表时间：
2008-05
影响因子：
5.4
通讯作者：
D. Tong;Xue Han;W. Chu;Hong Chen;X. Ji
中科院分区：
文献类型：
--
作者：
D. Tong;Xue Han;W. Chu;Hong Chen;X. Ji
Co-B flowers with mesoporous structure were first prepared via reduction of cobalt acetate by potassium borohydride in the presence of complexing agent ethylenediamine. The as-prepared Co-B flowers were characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, N2adsorption–desorption, and magnetic performance test. The Co-B flowers exhibited enhanced coercivity, and weakened saturation magnetization and remanet magnetization as compared with the regular Co-B. During the hydrolysis of KBH4, the Co-B flowers exhibited higher catalytic activity than the regular Co-B. It is attributed to the larger specific surface area and mesoporous channels. During the successive reactions, the conversion of KBH4over Co-B flowers was about 97%. The average H2generation rate of Co-B flowers was 4620mL/min/g-catalyst in 1.5wt% NaOH+15wt% KBH4solution, which may give a successive H2supply for a 748W polymer electrolyte membrane fuel cell (PEMFC) at 100% H2utilization.
