Composites of Ceramic High-Temperature Proton Conductors with Inorganic Compounds

Abstract

This work deals with composites of high-temperature proton conductors and inorganic compounds such as carbonates, hydroxides, and chlorides. Discontinuities were found in the T vs. 1/T plots which are ascribed to superionic phase transitions occurring in the interface region between the constituent phases. A similar superionic phase transition was also found between a composite of a proton conductor and a prominent oxygen ion conductor. The results provide a natural explanation for the high conductivities recently reported for similar composites of oxygen ion conductors and such inorganic compounds ͓B. Zhu, J. Power Sources, 114, 1 ͑2003͔͒ and also explains the high current densities obtained in intermediate temperature fuel cells based on such composites.

Next generation fuel cell R&D

“…The CBCs (usually containing two phases) and their successful LTSOFC applications have shown great performance improvements that have demonstrated a breakthrough in fuel cell R&D (Zhu, 2001a, b;Zhu et al, 2003aZhu et al, , 2004. New research achievements on the CBC materials showed superionic and dual or hybrid H + /O 2À conduction with a conductivity of 10 À1 S cm À1 below 6008C (Schober, 2005;Zhu, 2003). Currently joint industrial developments on the CBCs have been scaled up for production, to manufacture the practical large cells and develop the kW prototype LTSOFCs.…”

Stability of metal oxides against Li/Na carbonates in composite electrolytes

“…19 Few studies were also done involving proton conducting electrolytes like BCY (yttria-doped BaCeO 3 ) or BZY (yttria-doped BaZrO 3 ) as oxide matrix. 8,20 Apart from that, less attention has been paid so far to develop alternative chemically stable oxide matrices against the molten carbonates.…”

Breakthrough fuel cell technology using ceria-based multi-functional nanocomposites

“…Composite solid electrolytes have got more attention as compared to pure electrolytes due to their higher conductivity and enhanced mechanical strength [64][65][66][67][68][69][70][71]. The control of the electrolyte properties through the variability of the conductance type is very flexible.…”