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Elsevier, Journal of Power Sources, (260), p. 159-162, 2014

DOI: 10.1016/j.jpowsour.2014.03.019

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Soft chemical synthesis and the role of potassium pentahydrogen bis(phosphate) in a proton conducting composite electrolyte based on potassium dihydrogen phosphate

Journal article published in 2014 by Chung-Yul Yoo ORCID, Si Young Jang, Jong Hoon Joo, Ji Haeng Yu, Jong-Nam Kim
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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).