Pressure Isotherms of Hydrogen Adsorption in Carbon Nanostructures

2001 ◽  
Vol 706 ◽  
Author(s):  
Xiaohong Chen ◽  
Urszula Dettlaff-Weglikowska ◽  
Miroslav Haluska ◽  
Martin Hulman ◽  
Siegmar Roth ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Hydrogen Storage ◽  
Carbon Nanostructures ◽  
Room Temperature ◽  
Storage Capacity ◽  
Hydrogen Adsorption ◽  
Single Wall Carbon Nanotubes ◽  
Hydrogen Storage Capacity ◽  
Carbon And Graphite

AbstractThe hydrogen adsorption capacity of various carbon nanostructures including single-wall carbon nanotubes, graphitic nanofibers, activated carbon, and graphite has been measured as a function of pressure and temperature. Our results show that at room temperature and a pressure of 80 bar the hydrogen storage capacity is less than 1 wt.% for all samples. Upon cooling, the capacity of hydrogen adsorption increases with decreasing temperature and the highest value was observed to be 2.9 wt. % at 50 bar and 77 K. The correlation between hydrogen storage capacity and specific surface area is discussed.

Simulation for Hydrogen Absorption on Single Wall Carbon Nanotubes Using the First Principle

2012 ◽  
Vol 472-475 ◽  
pp. 1787-1791
Author(s):  
A Qing Chen ◽  
Qing Yi Shao ◽  
Li Wang
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Hydrogen Absorption ◽  
Density Functional ◽  
Storage Capacity ◽  
Single Wall Carbon Nanotubes ◽  
First Principle ◽  
Hydrogen Storage Capacity ◽  
Functional Theory ◽  
Single Wall Carbon

The hydrogen storage on single wall carbon is studied by using the first principle based on density functional theory (DFT). It concludes that the adsorption of hydrogen on the bare distorted single carbon nanotubes (SWNTs) can be enhanced dramatically when the single wall carbon nanotubes are rotated along the tubs axis. On the other hand, it suggests that the hydrogen storage capacity of SWNTs depend on the deformation angles.

Hydrogen Storage in Carbon Nanotubes Prepared by Using Copper Nanoparticles as Catalyst

2012 ◽  
Vol 251 ◽  
pp. 342-345 ◽  
Author(s):  
Jin Chen ◽  
Xiao Gang Wang ◽  
Hai Yan Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Copper Nanoparticles ◽  
Room Temperature ◽  
Storage Capacity ◽  
Dissociative Adsorption ◽  
Electrochemical System ◽  
Hydrogen Storage Capacity ◽  
Structure Phase ◽  
Fundamental Understanding

carbon nanotubes were synthesized by pyroysis method using copper nanoparticles as catalyst. The structure, phase composition and hydrogen storage capacity were investigated by TEM, XRD spectra and Electrochemical System. The results show that the diameter of carbon nanotubes is 200-500nm, The P-C-T curve of adsorbing hydrogen of samples was measured in the pressure up to 12 MPa at room temperature. we show that a SWNT can strongly adsorb up to 8-wt% hydrogen. These results advance our fundamental understanding of dissociative adsorption of hydrogen in nanostructures and suggest new routes to better storage and catalyst materials.

Hydrogen Storage Behaviors of Ni-Loaded Activated Carbon Nanotubes

2010 ◽  
Vol 123-125 ◽  
pp. 695-698 ◽  
Author(s):  
Seul Yi Lee ◽  
Soo Jin Park
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Chemical Activation ◽  
Spillover Effect ◽  
Textural Properties ◽  
Hydrogen Storage Capacity ◽  
Ni Content ◽  
Storage Characteristics

In this work, nickel (Ni)-loaded activated carbon nanotubes (ACNTs) were prepared for hydrogen storage applications. The process was conducted by chemical activation method at 900oC with KOH:CNTs ratios (4:1, g/g). And then, Ni-loaded ACNTs were also formulated to investigate the hydrogen storage characteristics as a function of Ni content. The microstructures of the Ni-loaded ACNTs were characterized by XRD and TEM measurements. The textural properties of the samples were analyzed using N2 adsorption isotherms at 77 K. The BET, D-R, and BJH equations were used to observe the specific surface areas, the micropore, and mesopore structures, respectively. The hydrogen storage capacity of the Ni-loaded ACNTs was measured at 298 K at a pressure of 100 bar. It was found that the hydrogen storage capacity of Ni-loaded ACNTs was enhanced in proportion to the Ni content, with Ni-5-ACNTs exhibiting the largest hydrogen storage capacity. Therefore, it could be concluded that the significantly created micropores on CNTs by chemical activation had an effect on hydrogen storage behaviors as well as the Ni particles played an important role in hydrogen storage characteristics due to the hydrogen spillover effect.

Hydrogen Storage Using Carbon Nanostructures

2015 ◽  
Author(s):  
Sheriden Smith ◽  
Young Ho Park
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Carbon Nanostructures ◽  
Storage Capacity ◽  
Molecular Level ◽  
Hydrogen Storage Capacity ◽  
Atom Ratio ◽  
Adsorption Mechanisms ◽  
Hydrogen Density ◽  
Atomic Simulations

Carbon nanostructures were reported to be very promising materials for hydrogen storage, and a great deal of interest has been focused on adsorption of molecular hydrogen in carbon nanostructures. Although many experimental results for hydrogen storage in carbon nanostructures were reported, corresponding theoretical studies have not been developed and adsorption mechanisms have not been fully identified. Better understanding of molecular level phenomena provides clues to designing hydrogen storage that performs better. Atomic simulations are useful in the evaluation of hydrogen storage capacity of carbon nanotubes. In this paper, molecular simulations of hydrogen physisorption in carbon nanotubes were conducted. Hydrogen density distribution near carbon nanotubes was studied, and hydrogen storage capability is determined by computing hydrogen to carbon atom ratio. The peak hydrogen concentration around the nanostructures was simulated to be located relatively consistently around 3 angstroms away from each nanostructure.

Study on Electrochemical Hydrogen Storage of Multi-Walled Carbon Nanotubes

2007 ◽  
Vol 26-28 ◽  
pp. 831-834 ◽  
Author(s):  
Lei Xie ◽  
Xiao Qi Li
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Weight Percent ◽  
Chemical Form ◽  
Hydrogen Storage Capacity ◽  
Electrochemical Hydrogen Storage ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Discharging Capacity

The electrode(Ni-MWNTs) containing nickel(Ni) and multi-walled carbon nanotubes (MWNTs) was prepared by composite electrodeposit. Electrochemical hydrogen storage of the electrode was studied. The result showed a high electrochemical discharging capacity of up to 1361.1mA·h·g-1, which corresponds to a hydrogen storage capacity of 4.77Wt%(weight percent). Test of cyclic lifespan showed MWNTs had certain cyclic lifespan. Cyclic voltammetry tests showed that MWNTs can store hydrogen in chemical form.

Effect of pH on enhancement of hydrogen storage capacity in carbon nanotubes on a copper substrate

2017 ◽  
Vol 526 ◽  
pp. 143-148 ◽  
Author(s):  
Sh. Varshoy ◽  
B. Khoshnevisan ◽  
M. Mohammadi ◽  
M. Behpour
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Copper Substrate ◽  
Hydrogen Storage Capacity ◽  
Effect Of Ph
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