Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 23, Issue 23, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/23/23/234110
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The electrolytes currently used for proton exchange membrane fuel cells are mainly based on polymers such as Nafion which limits the operation regime of the cell to similar to 80 degrees C. Solid oxide fuel cells operate at much elevated temperatures compared to proton exchange membrane fuel cells (similar to 1000 degrees C) and employ oxide electrolytes such as yttrium stabilized zirconia and gadolinium doped ceria. So far an intermediate temperature operation regime (300 degrees C) has not been widely explored which would open new pathways for novel fuel cell systems. In this review we summarize the potential use of phosphate compounds as electrolytes for intermediate temperature fuel cells. Various examples on ammonium polyphosphate, pyrophosphate, cesium phosphate and other phosphate based electrolytes are presented and their preparation methods, conduction mechanism and conductivity values are demonstrated.
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