Category Archives: Neutron Scattering Applications and Techniques

Studies of Local-Diffusional Proton-Dynamics

The majority of QENS studies on proton-conducting perovskites have been per­formed with the use of either time-of-flight or backscattering methods [58]. These methods give access to the picosecond timescale, extended to * 1 nanosecond in some cases, in which local diffusional-dynamics have been observed, although data have also been interpreted in terms of translational diffusion [59, 60]. The first work […]

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References

Hydrogen Storage Materials Juergen Eckert and Wiebke Lohstroh Abstract An eventual realization of a Hydrogen Economy requires working solutions in three fundamental areas, namely hydrogen production, hydrogen storage, and fuel cells, in addition to the development of an extensive, new infra­structure. While neutron scattering experiments and the associated techniques of analysis have been of utility in all three of these […]

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Proton-Conducting Perovskites

The first report on proton conduction in perovskite-structured oxides dates back to 1981, when Iwahara and co-workers [18] showed that the perovskites SrCeO3 and BaCeO3 exhibit high proton-conductivities in hydrogen-containing atmospheres and may be applicable as electrolytic membrane in electrochemical cells such as fuel cells, steam electrolyzers, and gas sensors. Although BaCeO3 has remained a benchmark for high proton-conductivity in […]

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Electrolytes

Commercial electrolytes typically contain a Li salt dissolved in an organic solvent and are often composed of two components: one for the dissolution of the salt and another that assists in the formation of a protective layer on the anode to prevent continuous electrolyte-reduction and self-discharge, e. g. ethylene carbonate. These electrolyte systems, being non-aqueous and highly air-sensitive, tend to […]

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Studies of Long-Range Diffusional Proton Dynamics

NSE offers a unique opportunity to obtain information about dynamical processes on different timescales, e. g. from the elementary processes of the proton-conduction mechanism occurring on the picosecond timescale to the long-range translational diffusion of protons occurring on the nanosecond timescale, simultaneously. Despite these advantages, the first application of NSE to investigate proton-conducting ceramics was relatively recent, in 2010 when […]

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Transport and Dynamics

In order to understand the performance of PEM fuel cells, it is necessary to not only understand the structure but also the water dynamics in these materials over a large range of humidities, temperatures, and processing conditions. Proper water man­agement is critical to optimal fuel-cell performance. Many studies have focused on understanding the bulk-water transport and there has been a […]

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