Proton dynamics in phosphotungstic acid impregnated mesoporous silica proton exchange membrane materials
作者： Krystina Lamb , Richard A. Mole , Dehong Yu , Roland de Marco , John R. Bartlett
DOI: 10.1016/J.GEE.2017.06.007
关键词: Proton exchange membrane fuel cell 、 Diffusion 、 Chemistry 、 Inorganic chemistry 、 Quasielastic neutron scattering 、 Proton 、 Mesoporous material 、 Nuclear chemistry 、 Mesoporous silica 、 Phosphotungstic acid 、 Proton conductor
摘要: Abstract Phosphotungstic acid is an excellent proton conductor that can be incorporated into porous supports, and nanocomposite exchange membrane materials made from mesoporous silica impregnated with phosphotungstic have been suggested for use in fuels cells operating > 100 °C. In this work, quasielastic neutron scattering was used to study self-diffusion disordered P 6 mm symmetry two concentrations of acid. Overall, the structure had a significantly greater effect on conduction diffusion than concentration, higher occurring samples. Quasielastic revealed populations protons diffusing through each sample, limited by slower these populations, which diffuse via jump-diffusion mechanism. Whilst fundamental mechanism moved found similar both supports concentrations, faster structured arises lower residence time moving between sites model, suggesting energy barrier.
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