Electrochemical Hydrogen Storage in Single-Walled Carbon Nanotube Paper

Single-walled carbon nanotube (SWNT) papers were successfully prepared by dispersing SWNTs in Triton X-100 solution, then filtered by PVDF membrane (0.22 μm pore size). The electrochemical behavior and the reversible hydrogen storage capacity of single-walled carbon nanotube (SWNT) papers have been investigated in alkaline electrolytic solutions (6 N KOH) by cyclic voltammetry, linear micropolarization, and constant current charge/discharge measurements. The effect of thickness and the addition of carbon black on hydrogen adsorption/desorption were also investigated. It was found that the electrochemical charge–discharge mechanism occurring in SWNT paper electrodes is somewhere between that of carbon nanotubes (physical process) and that of metal hydride electrodes (chemical process), and consists of a charge-transfer reaction (Reduction/Oxidation) and a diffusion step (Diffusion).

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Simulation of Hydrogen Diffusion and Adsorption on Single-Walled Carbon Nanotube

Volume 9: Micro- and Nano-Systems Engineering and Packaging, Parts A and B ◽

10.1115/imece2012-87222 ◽

2012 ◽

Author(s):

Y. H. Liu ◽

B. Tian ◽

F. Wang ◽

J. Wei ◽

K. L. Zhang

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Hydrogen Storage ◽

Fossil Fuels ◽

Hydrogen Diffusion ◽

Hydrogen Adsorption ◽

High Surface ◽

Volume Ratio ◽

Single Walled Carbon Nanotube ◽

Single Walled Carbon

With clean fuels increasingly used for transportation due to environmental concerns and limited supply of fossil fuels, hydrogen is attracting more attention as a clean fuel free from carbon dioxide and other greenhouse gas emissions. Analysis of hydrogen diffusion in single-walled carbon nanotube was performed with molecular dynamic simulation. The carbon nanotube is chosen because of a well-known fact that it is an excellent adsorption material with high surface volume ratio. In this paper, diffusivity rate are simulated to study the interaction of molecular and atomic hydrogen with single-walled carbon nanotubes. The adsorption energy and repulsive energy are analyzed to explore the nanotube structure after desorption and the mechanism of desorption. Electric charge density is also studied in order to understand better the process of hydrogen adsorption in CNT. A background of the hydrogen storage problem with carbon nanotubes is provided and the issues to be resolved have been highlighted. Future directions to address these challenges have also been suggested. We make a case that molecular simulation studies can identify the most promising structures and compositions to maximize hydrogen storage.

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STUDY OF HYDROGEN STORAGE IN ALUMINUM HYDRIDE COATED SINGLE-WALLED CARBON NANOTUBE

International Journal of Nanoscience ◽

10.1142/s0219581x09005633 ◽

2009 ◽

Vol 08 (01n02) ◽

pp. 43-47

Author(s):

K. IYAKUTTI ◽

Y. KAWAZOE ◽

M. RAJARAJESWARI ◽

V. J. SURYA

Keyword(s):

Carbon Nanotube ◽

Hydrogen Storage ◽

Bond Length ◽

Metal Hydride ◽

Aluminum Hydride ◽

Light Metal ◽

Storage Process ◽

High Coverage ◽

Single Walled Carbon Nanotube ◽

Single Walled Carbon

In this study, we report the hydrogen storage in aluminum hydride coated single-walled carbon nanotube. All the H 2 adsorption is molecular with H – H bond length of 0.756 Å. The hydrogen storage capacities with half and full coverages are 6.01 (8.3) wt% and 7.2 (10.3) wt%, respectively, without (with) H 3 of AlH 3. At high coverage of AlH 3 ( C 10 AlH 3) interesting clustering/ dimerization of AlH 3 is observed. These systems are quite stable and the H 2 can be extracted from the system without disturbing the C – Al bonding or detaching the AlH 3 from the carbon nanotube. This present study on a full molecular adsorption of hydrogen via light metal-hydride AlH 3 is new and it leads to a practically viable hydrogen storage process.

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