Molecular aggregation in composite electrolytes based on phosphotungstic acid and calixareneстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 1 июня 2022 г.
Аннотация:Solid-state proton conductors are the most promising candidates for use as solid electrolytes for gas sensors and fuel cells. The transport of protons in most of these materials depends on the humidity of the environment; therefore, it is important to search for materials that stabilize conductivity at low humidity. Such materials can be hydrophilic heteropoly acids and calixarene sulfonic acids, which conductivity is well even in a dry atmosphere. Therefore, the proton conductivity of a mixture of these components was investigated in the work. The effect of the formation of the "molecular composite" with new properties was found during cryogenic drying of the initial solution. This material can retain significant amounts of water, more than the sum of the original components, even at low ambient humidity. As a result, the material with an optimal composition retains a high conductivity at low humidity. The mechanism of calixarene aggregation into more complex hierarchical structures due to the binding of several of its micellar aggregates by heteropoly acid molecules has been proposed as an explanation for the discovered effects. Condensation of such aggregates during cryogenic drying leads to the formation of a composite material with a non-linear composition-property relationship.