ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2002,Vol.18>> Issue(08)>> 692-698     doi: 10.3866/PKU.WHXB20020805         中文摘要
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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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).

Keywords: Multi-walled carbon nanotubes   MWCNTs-based H2-storage material   Adsorption-desorption characteristics of H2   H2-TPD  
Received: 2001-12-19 Accepted: 2002-02-28 Publication Date (Web): 2002-08-15
Corresponding Authors: Zhang Hong-Bin Email:

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[J]. Acta Phys. -Chim. Sin., 2002,18 (08): 692-698.    doi: 10.3866/PKU.WHXB20020805
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