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Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (6): 484-490. Previous Articles Next Articles
Original Articles
武小满,王毅,董昆明,周金梅,林国栋,张鸿斌*
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WU Xiao-Man, WANG Yi, DONG Kun-Ming, ZHOU Jin-Mei, LIN Guo-Dong, ZHANG Hong-Bin*
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Storage capacity of H2 in a kind of potassium-modified multiwalled carbon nanotubes, K0-MWCNTs, was measured by using high-pressure volumetric method combined with desorption water- displacement method. It was experimentally shown that appropriate incorporation of a certain amount of metallic potassium into the MWCNTs could significantly increase the storage capacity of hydrogen. Under conditions of 7.25 MPa and ambient temperature, H2 uptake of 3.8 wt% could be achieved by the x%K0-MWCNTs (x%=30%~35%, mass percentage), which was 2.5 times as high as that by the K0-free MWCNTs under the same conditions. It was also indicated that adsorption of 99% of the H2 was reversible, and that 88% of the stored hydrogen (equalling storage capacities of 3.36 wt%) could be desorbed while the pressure was relieved to atmospheric pressure and ~11% of the stored hydrogen (equalling storage capacities of 0.41 wt%) was desorbed in the following process of elevating temperature from room temperature to 673 K. The Raman-spectroscopic and TPD-MS/GC investigations of the H2/K0-MWCNTs adsorption systems showed that adsorption of H2 on the MWCNTs could occur in associative and dissociative forms, with the observed νs(C—H) for CH2, ν(C—H) for CH and ν(H—H) for H2 (a) at 2856, 3228 and 3946 cm-1, respectively, and that H2 was the predominant products desorbed at temperatures lower than 723 K, whereas in addition to H2, light hydrocarbons such as CH4, C2H4, C2H2, etc. were also involved in the products desorbed at temperatures higher than 723 K.
Key words: MWCNTs, K0-MWCNTs, hydrogen-storage, Raman spectra of H2/K0-MWCNTs
WU Xiao-Man, WANG Yi, DONG Kun-Ming, ZHOU Jin-Mei, LIN Guo-Dong, ZHANG Hong-Bin*. Study of Storage and Adsorption/Desorption Characteristics of H2 on MWCNTs Modified by Metal Potassium[J]. Acta Chimica Sinica, 2005, 63(6): 484-490.
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