Large cryogenic storage of hydrogen in carbon nanotubes at low pressures

B.K. Pradhan; A.R. Harutyunyan; D. Stojkovic

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Large cryogenic storage of hydrogen in carbon nanotubes at low pressures

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We report up to 6 wt percent storage of H_2 at 2 atm and T = 77 K in processed bundles of single-walled carbon nanotubes. The hydrogen storage isotherms are completely reversible; D_2 isotherms confirmed this anomalous low-pressure adsorption and also revealed the effects of quantum mechanical zero point motion. We propose that our postsynthesis treatment of the sample improves access for hydrogen to the central pores within individual nanotubes and may also create a roughened tube surface with an increased binding energy for hydrogen. Such an enhancement may be needed to understand the strong adsorption at low pressure. We obtained an experimental isosteric heat q_(st) = 125 +- 5 meV. Calculations are also presented that indicate disorder in the tube wall enhances the binding energy of H_2.

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《Journal of Materials Research》 |2002年第9期|2209-2216|共8页
作者
B.K. Pradhan; A.R. Harutyunyan; D. Stojkovic;
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作者单位

Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
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Large cryogenic storage of hydrogen in carbon nanotubes at low pressures

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