Dynamics of molecular hydrogen in carbon gel systems
The proposal is the continuation of 7-5-438 (Experiment is foreseen in April/May 2015). In the last round we were granted half of the beamtime that needed for the project, therefore hereby we are applying for the remaining time to complete our study. We propose a neutron spin-echo study of the diffusion of molecular hydrogen adsorbed in carbon aerogel, which has been produced by the group of the Hungarian co-proposer. Carbon aerogels exhibit a well-developed, hierarchal pore structure. Their specific surface area, as well as the pore size distribution (the ratio between micro-, meso- and macropores) can be finely tuned during the preparation process. Further treatments, such as activation, oxidation, etc. open the possibility to change the surface chemistry of these carbons. Addition of melamine, urea, etc. to the precursor synthesis mixture leads to N-containing carbon aerogels, which are particularly advantageous as PEMFC cathodes. We propose to compare the hydrogen dynamics on 3 carbon gel samples with different pore size and/or surface properties. We will also compare these data with our recently obtained data from exfoliated graphite and standard XC72 carbon blacks.
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CZAKKEL Orsolya; BAHN Emanuel and FOUQUET Peter. (2015). Dynamics of molecular hydrogen in carbon gel systems. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-451
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