The Science and Technology of Oxyanion-Based Superprotonic Conductors

A general overview of the proton transport mechanisms in three important classes of superprotonically conducting solid-acid compounds is presented. The first class comprises those solid acids which are tetragonal at high temperature and includes CsHSO4 and CsHSeO4, the second class, those which are trigonal and includes Rb3H(SeO4)2, Cs3H(SeO4)2 and (NH4)3H(SO4)2, and the third class those which are cubic. Representative members of this family include a-Cs3(HSO4)2(H2PO4) and Cs2(HSO4)(H2PO4). In addition to discussing the fundamental structural and transport properties of these materials, the potential for utilizing them in technological applications, with particular focus on fuel cells, is explored.

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