Proton conducting (Na, H)5GdSi4O12 ceramics and their use in steam electrolytes
1986; Elsevier BV; Volume: 20; Issue: 2 Linguagem: Inglês
10.1016/0167-2738(86)90022-6
ISSN1872-7689
AutoresKimihiro Yamashita, P. Nicholson,
Tópico(s)Fuel Cells and Related Materials
ResumoA polycrystalline proton conductor has been obtained by field-assisted ion exchange (FAIE) of the mobile Na+ in Na5GdSi4O12 by H3O+. Polycrystalline Na5GdSi4O12 (NGS) and (KxNa5−x)GdSi4O12 (KNGS) were examined as precursor ceramics. By modelling the FAIE process, it appears that KNGS is superior to NGS for ion exchange. The time required to complete the ion exchange process is ≈1.7×;102h at 338 K, and the activation energy for proton conduction is 10.7±0.3 (kcal/mol). The H3O-NGS ceramic was successfully incorporated into steam electrolysis cell operating at ≈90°C.
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