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Acta Physico-Chimica Sinica  2002, Vol. 18 Issue (08): 692-698    DOI: 10.3866/PKU.WHXB20020805
Article     
Characteristics of Adsorption and Desorption of Hydrogen on Multi-walled Carbon Nanotubes
Zhou Zhen-Hua;Wu Xiao-Man;Wang Yi;Lin Guo-Dong;Zhang Hong-Bin
College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry for the Solid Surfaces, Xiamen University, Xiamen 361005
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Abstract  Storage capacities of H2 in a kind of multi-walled carbon nanotubes (MWCNTs) and its corresponding system modified with K+ salt were measured using volumetric method, and characteristics of adsorption and desorption of hydrogen on MWCNTs were studied by means of temperature-programmed desorption (TPD) method. The results showed that the storage capacities of H2 in the purified MWCNTs could reach 1.51% (mass fraction) under condition of room temperature and 9.0 MPa, with adsorption of ~99% of the H2 being reversible. A comparative study indicated that the modification of the K+ salt to the MWCNTs did not improve its storage capacity of hydrogen, but led to elevating of desorption temperature of adsorbed hydrogen H2(a) to a certain extent; in addition, the K+ modification resulted also in changing of surface property of the MWCNTs from original hydrophobicity to hydrophilicity. The products desorbed on H2/MWCNTs involved exclusively H2 at T≤ 723 K, and main part of H2 and small amount of CH4,C2H4,and C2H2 at T ≥ 773 K; whereas on H2/K+-MWCNTs,H2O was also involved in the desorbed products, in addition to H2 and small amount of C1/C2-hydrocarbons.The adsorption of H2 on the MWCNTs-based materials is in the two models: associative (molecular state) and dissociative (atomic state).

Key wordsMulti-walled carbon nanotubes      MWCNTs-based H2-storage material      Adsorption-desorption characteristics of H2      H2-TPD     
Received: 19 December 2001      Published: 15 August 2002
Corresponding Authors: Zhang Hong-Bin     E-mail: hbzhang@xmu.edu.cn
Cite this article:

Zhou Zhen-Hua;Wu Xiao-Man;Wang Yi;Lin Guo-Dong;Zhang Hong-Bin. Characteristics of Adsorption and Desorption of Hydrogen on Multi-walled Carbon Nanotubes. Acta Physico-Chimica Sinica, 2002, 18(08): 692-698.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20020805     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2002/V18/I08/692

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