Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
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Effects of Nitric Acid and Heat Treatment on Hydrogen Adsorption of Single-Walled Carbon Nanotubes

H. Takagi A C , Y. Soneda A , H. Hatori A , Z. H. Zhu B and G. Q. Lu B
+ Author Affiliations
- Author Affiliations

A National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan.

B ARC Centre for Functional Nanomaterials, School of Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.

C Corresponding author. Email: hide-takagi@aist.go.jp

Australian Journal of Chemistry 60(7) 519-523 https://doi.org/10.1071/CH06409
Submitted: 1 November 2006  Accepted: 23 March 2007   Published: 9 July 2007

Abstract

The effects of nitric acid treatment and subsequent heat treatment on the hydrogen adsorption properties of single-walled carbon nanotube (SWCNT) samples were investigated. The hydrogen adsorption and desorption isotherms of SWCNTs treated with nitric acid alone and SWCNTs treated with nitric acid and then heated were measured at 77 and 303 K over the hydrogen pressure range 0–3.5 MPa. Nitric acid treatment increased hydrogen adsorption by opening the nanotubes and changing the bundle structure. Subsequent heat treatment of the acid-treated SWCNT sample further increased hydrogen adsorption by removing functional groups introduced by the acid treatment.


Acknowledgments

This work was supported by a grant (Support of Young Researchers with a Term) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. Support from an Australian Research Council Linkage International Award project is also acknowledged.


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