Title of article :
Preparation and characterization of Co-B flowers with mesoporous structure
Author/Authors :
Tong، نويسنده , , Dong-Ge and Han، نويسنده , , Xue and Chu، نويسنده , , Wei and Chen، نويسنده , , Hong and Ji، نويسنده , , Xiao-Yang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
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, N2 adsorption–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 KBH4 over Co-B flowers was about 97%. The average H2 generation rate of Co-B flowers was 4620 mL/min/g-catalyst in 1.5 wt% NaOH + 15 wt% KBH4 solution, which may give a successive H2 supply for a 748 W polymer electrolyte membrane fuel cell (PEMFC) at 100% H2 utilization.
Keywords :
A. Amorphous materials , A. Nanostructures , D. Catalytic properties , D. Magnetic properties
Journal title :
Materials Research Bulletin
Journal title :
Materials Research Bulletin