Diffusion of molecular hydrogen in carbon aerogel

被引：12

作者：

Bahn, Emanuel ^{[1
,2
]}

Czakkel, Orsolya ^{[1
]}

Nagy, Balazs ^{[3
]}

Laszlo, Krisztina ^{[3
]}

Villar-Rodil, Silvia ^{[4
]}

Tascon, Juan M. D. ^{[4
]}

Demmel, Franz ^{[5
]}

Telling, Mark T. F. ^{[5
,6
]}

Fouquet, Peter ^{[1
]}

机构：

[1] Inst Laue Langevin, F-38042 Grenoble 9, France

[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[3] Budapest Univ Technol & Econ, Dept Phys Chem & Mat, H-1521 Budapest, Hungary

[4] CSIC, Inst Nacl Carbon, INCAR, E-33080 Oviedo, Spain

[5] Rutherford Appleton Lab, ISIS Facil, Chilton OX11 0QX, Oxon, England

[6] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

CARBON | 2016年 / 98卷

关键词：

PORE-SIZE DISTRIBUTION; ORTHO-PARA CONVERSION; NEUTRON-SCATTERING; SELF-DIFFUSION; SOLID HYDROGEN; SLOW-NEUTRONS; ADSORPTION; STORAGE; NANOTUBES; GRAPHITE;

D O I：

10.1016/j.carbon.2015.11.034

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The diffusion of hydrogen molecules adsorbed in a highly porous carbon aerogel has been studied with quasi-elastic neutron scattering. Hydrogen diffusion in this carbon substrate followed an activated jump process with a single activation barrier. The temperature dependence of the diffusion rate agrees well with previous results from activated carbons and other highly porous carbons. The carbon aerogel sample showed a strongly enhanced conversion between the ortho-and para-hydrogen spin states. The ortho-para conversion process, however, was inhibited for a fraction of the hydrogen molecules. This inhibition process is attributed to a rotational confinement of the hydrogen molecules at the nanometre scale. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：572 / 581

页数：10

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