scholarly journals Textural development and hydrogen adsorption of carbon materials from PET waste

2004 ◽  
Vol 379 (1-2) ◽  
pp. 280-289 ◽  
Author(s):  
J.B. Parra ◽  
C.O. Ania ◽  
A. Arenillas ◽  
F. Rubiera ◽  
J.M. Palacios ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Pet Waste ◽  
Textural Development

Effects of Supports on Hydrogen Adsorption on Pt Clusters

2008 ◽  
Vol 139 ◽  
pp. 41-46 ◽  
Author(s):  
K. Okazaki-Maeda ◽  
Y. Morikawa ◽  
Shingo Tanaka ◽  
Masanori Kohyama
Keyword(s):  
Catalytic Activity ◽  
First Principles ◽  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Nano Particles ◽  
High Dispersion ◽  
Graphene Sheets ◽  
First Principles Calculations ◽  
Small Clusters ◽  
Atom Absorption

Pt nano-particles are supported on carbon materials at the electrode catalysts of protonexchange menbrane fuel cells. Pt nano-particles are desirable to be strongly adsorbed on carbon materials for high dispersion, although strong Pt-C interactions may affect the catalytic activity of small clusters. Thus we have examined H-atom absorption on Pt clusters supported or unsupported on graphene sheets, using first-principles calculations. For Pt-atom/graphene systems, a H atom is more weakly adsorbed than for a free Pt atom, and the H-Pt interaction becomes weaker if the interaction between a Pt atom and graphene becomes stronger. For the Ptn-cluster/graphene systems (n=2-4), the H-Pt interactions are also substantially changed from those for free Pt clusters. In the Pt clusters on graphene, the Pt-Pt distances are substantially changed associated with the electronicstructure changes by the Pt-C interactions. These structural and electronic changes in the Pt clusters as well as the presence of graphene itself seem to cause the changes in the absorption energies and preferential sites of H-atom absorption.

scholarly journals Oxygen-promoted hydrogen adsorption on activated and hybrid carbon materials

2020 ◽  
Vol 45 (55) ◽  
pp. 30767-30782
Author(s):  
S. Schaefer ◽  
A. Jeder ◽  
G. Sdanghi ◽  
P. Gadonneix ◽  
A. Abdedayem ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Hybrid Carbon Materials ◽  
Hybrid Carbon

Hydrogen Storage using Carbon Materials at Room Temperature

2003 ◽  
Vol 801 ◽  
Author(s):  
H. Kajiura ◽  
S. Tsutsui ◽  
K. Kadono ◽  
Y. Murakami ◽  
M. Kakuta ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Room Temperature ◽  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Constant Pressure ◽  
Graphite Powder ◽  
Milling Process ◽  
Volumetric Method ◽  
Hydrogen Molecules ◽  
Available Carbon

ABSTRACTThe hydrogen adsorption capacity of commercially available carbon materials with different nanostructures was measured at room temperature using an apparatus based on a volumetric method with an error of less than 0.04 wt% per one gram of sample. The obtained results suggest that nanosutures of the sample influence the hydrogen adsorption capacity. To confirm this hypothesis, we prepared nanostructured graphite from graphite powder using a mechanical milling process at a pressure of 2.0 × 10−4 Pa. The untreated graphite adsorbed 0.02wt% of hydrogen at 6 MPa at room temperature, while 0.20 − 0.25 wt% of hydrogen can be repeatedly adsorbed by the nanostructured graphite. Measurements of the hydrogen adsorption rate at constant pressure and pore-size distribution imply that the hydrogen molecules are adsorbed through a diffusion process in pores with a diameter less than 1 nm.

Hydrogen Adsorption on Nanotextured Carbon Materials

2018 ◽  
pp. 263-320 ◽  
Author(s):  
G. Sdanghi ◽  
G. Sdanghi ◽  
G. Maranzana ◽  
A. Celzard ◽  
V. Fierro
Keyword(s):  
Carbon Materials ◽  
Hydrogen Adsorption

Theoretical Study on N Doping in Carbon Materials for Hydrogen Storage

2009 ◽  
Vol 1216 ◽  
Author(s):  
Megumi Kayanuma ◽  
Tamio Ikeshoji ◽  
Hiroshi Ogawa
Keyword(s):  
Hydrogen Storage ◽  
Potential Energy Surfaces ◽  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Orbital Method ◽  
Hydrogen Chemisorption ◽  
N Doping ◽  
Nitrogen Substitution ◽  
Energy Surfaces ◽  
Homo Lumo

AbstractInteraction between nitrogen-substituted graphene-like compounds and hydrogen was investigated using ab initio molecular orbital method in the aspect of hydrogen storage. We adopted coronene as a model compound for fragmented graphene-like carbon materials and compared the interaction between hydrogen and pure or N-substituted coronenes by changing nitrogen positions. Among the assumed 19 N-substituted models, polarozabilities and HOMO–LUMO gaps were compared to evaluate physisorption and chemisorption energies. As for chemisorption, two N-substituted models were selected and closely examined to reveal the dependence on both nitrogen-substitution and hydrogen-adsorption positions. Potential energy surfaces as a function of H–H bond length and H2–coronen distance showed that the barrier height for hydrogen chemisorption strongly depends on N-substitution positions. The chemisorbed products of N-substituted coronenes are stabilized or destabilized compared with the pure carbon case depending on the sites of N-substitution and H-adsorption. These results suggest that N-substitution at certain positions possibly improve hydrogen storage properties of graphene-like materials.

Thermoanalytical investigations of hydrogen adsorption on carbon materials

2004 ◽  
Vol 415 (1-2) ◽  
pp. 43-45 ◽  
Author(s):  
E Henneberg ◽  
B Bernhardt ◽  
K Bohmhammel
Keyword(s):  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Thermoanalytical Investigations

Synthesis of KOH-activated porous carbon materials and study of hydrogen adsorption

2013 ◽  
Vol 580 ◽  
pp. S301-S304 ◽  
Author(s):  
Ai Minoda ◽  
Shinji Oshima ◽  
Hideshi Iki ◽  
Etsuo Akiba
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Porous Carbon Materials

Hydrogen adsorption on carbon materials

1999 ◽  
Vol 84 (2) ◽  
pp. 221-224 ◽  
Author(s):  
R. Ströbel ◽  
L. Jörissen ◽  
T. Schliermann ◽  
V. Trapp ◽  
W. Schütz ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Hydrogen Adsorption
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