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Indexed by:期刊论文

Date of Publication:2016-06-01

Journal:INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

Included Journals:SCIE

Volume:41

Issue:20

Page Number:8489-8497

ISSN No.:0360-3199

Key Words:Hydrochar materials; KOH activation; Porous carbons; Nitrogen-doped; Hydrogen storage

Abstract:Hydrothermally carbonized chitosan has been successfully used as a carbon source for the preparation of highly porous carbons via chemical activation. The porous carbons with different nitrogen contents (0.56-6.53 wt%) have high surface area (1362-3009 m(2) g(-1)) and large pore volume (0.670-1.497 cm(3) g(-1)). These properties can be varied from modifying the activation parameters (i.e., amount of activation agent and activation temperature). We observed hydrogen storage capacity of up to 2.71 wt% at 77 K and 1 bar, and 6.77 wt% at 20 bar, for PC-2-800 porous carbons. This result indicates that the hydrogen uptake of porous carbons mainly depends on the high micropore surface area related to optimum pore size. Furthermore, one found that high N-doping is beneficial for hydrogen storage at low pressure but it is detrimental at high pressure according to the analysis of hydrogen uptake isotherms. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.