Preparation and characterization of Co-B flowers with mesoporous structure

Journal Article · Tue May 06 00:00:00 EDT 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.05.021· OSTI ID:21144008

Xue, Han ^[1]; Hong, Chen; Xiaoyang, Ji ^[2]

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1. Lab 230, College of Chemical Engineering, Sichuan University, Chengdu 610065 (China)
2. Analytic and Testing Center, Sichuan University, Chengdu 610064 (China)

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, N{sub 2} 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 KBH{sub 4}, 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 KBH{sub 4} over Co-B flowers was about 97%. The average H{sub 2} generation rate of Co-B flowers was 4620 mL/min/g-catalyst in 1.5 wt% NaOH + 15 wt% KBH{sub 4} solution, which may give a successive H{sub 2} supply for a 748 W polymer electrolyte membrane fuel cell (PEMFC) at 100% H{sub 2} utilization.

• OSTI ID: 21144008
• Journal Information: Materials Research Bulletin, Vol. 43, Issue 5; Other Information: DOI: 10.1016/j.materresbull.2007.05.021; PII: S0025-5408(07)00206-1; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BOROHYDRIDES
BORON HYDRIDES
CHELATING AGENTS
COERCIVE FORCE
DESORPTION
EMISSION SPECTROSCOPY
HYDROGEN
HYDROLYSIS
MAGNETIC PROPERTIES
MAGNETIZATION
MEMBRANES
NANOSTRUCTURES
POLYMERS
POTASSIUM COMPOUNDS
PROTON EXCHANGE MEMBRANE FUEL CELLS
SCANNING ELECTRON MICROSCOPY
SODIUM HYDROXIDES
SPECIFIC SURFACE AREA
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY