HYDROGEN STORAGE IN N-DOPED MESOPOROUS CARBONS

HYDROGEN STORAGE IN N-DOPED MESOPOROUS CARBONS

An ordered mesoporous carbon CMK-3 was synthesized by replication using SBA-15 as a template and sucrose as carbonsource. The synthesized CMK-3 was modified by immersion with chitosan solution or ammonia aqueous solution. The effect ofCMK-3 surface modification on hydrogen storage capacity was investigated. The CMK-3 texture characteristics were determinedby using small angle X-ray scattering analysis, transmission electron microscope and nitrogen adsorption analysis. The surfacebasic functional groups were analyzed by X-ray photoelectron spectroscope and determined by the Boehm method. Hydrogencapacity of the CMK-3 samples was measured by a volumetric adsorption apparatus at 77, 90 and 195K under 0.1 MPa.Experimental results showed that hydrogen storage capacity of modified CMK-3 by chitosan and ammonia at 77K and 0.1 MPaincreased from 1.17 wt.% to 1.30 wt.% and to 1.31 wt.%, respectively. Although the specific surface areas and the microporevolumes of CMK-3 decreased after modification, the hydrogen storage capacity enhanced. The enhancement of hydrogen storagecapacity might be attributed to the nitrogen doping on the surface of CMK-3.