Abstract
A polycrystalline proton conductor has been obtained by field-assisted ion exchange (FAIE) of the mobile Na + in Na 5 GdSi 4 O 12 by H 3O +. Polycrystalline Na 5 GdSi 4 O 12 (NGS) and ( K x Na 5− x ) GdSi 4 O 12 (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×;10 2 h at 338 K, and the activation energy for proton conduction is 10.7±0.3 (kcal/mol). The H 3O-NGS ceramic was successfully incorporated into steam electrolysis cell operating at ≈90°C.
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