Elsevier, Journal of Power Sources, (260), p. 159-162, 2014
DOI: 10.1016/j.jpowsour.2014.03.019
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Proton conducting composites based on potassium dihydrogen phosphate (KH2PO4) have been successfully prepared and characterized as a potential electrolyte for intermediate temperature fuel cells. X-ray diffraction, thermal analysis, and conductivity measurements reveal that the molten potassium pentahydrogen bis(phosphate) (KH5(PO4)2) phase enhances the proton conductivity of KH2PO4–KH5(PO4)2 composites by more than four orders of magnitude. The addition of 10 wt.% SiO2 is sufficient to alleviate the dehydration of KH2PO4–KH5(PO4)2, and long-term stable conductivity is exhibited under a relatively low humidification level (pH2O = 0.03 atm).