1. Hydrogen storage of nanostructured TiO2-impregnated carbon nanotubes
- Author
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Renju Zacharia, Ae Rahn Kim, Sang Woon Hwang, Naik Mehraj-ud-din, Sami ullah Rather, and Kee Suk Nahm
- Subjects
Anatase ,Materials science ,Hydrogen ,Renewable Energy, Sustainability and the Environment ,Inorganic chemistry ,Energy Engineering and Power Technology ,Nanoparticle ,chemistry.chemical_element ,Carbon nanotube ,Condensed Matter Physics ,law.invention ,Hydrogen storage ,Fuel Technology ,Adsorption ,chemistry ,law ,Hydrothermal synthesis ,Nanorod - Abstract
Hydrogen uptake study of carbon nanotubes (CNTs) impregnated with TiO2-nanorods and nanotubes has been performed at room temperature and moderate hydrogen pressures of 8–18 atm. Under hydrothermal synthesis conditions, nanorods (NRs) and nanoparticles (NPs) are found to form either of the two polymorphic phases, i.e., nanorods are formed of predominantly anatase phase while nanoparticles are formed of rutile phase. NRs and NPs are introduced into the CNT matrix via the wetness-impregnation method. These composites store up to 0.40 wt.% of hydrogen at 298 K and 18 atm, which is nearly five times higher the hydrogen uptake of pristine CNTs. The excess amount of hydrogen stored in TiO2-impregnated CNTs is determined from the amount of TiO2 in the sample and the measured hydrogen uptake of TiO2 nanoparticles. Higher hydrogen uptake of NP-impregnated CNTs when compared pristine CNTs is accounted for by considering initial binding of hydrogen on TiO2 and subsequent spillover in CNT–TiO2-NPs.
- Published
- 2009