Specific electrical conductivity in molten potassium dihydrogen phosphate KH2PO4 – An electrolyte for water electrolysis at ∼300°C

A.V. Nikiforov, R.W. Berg, I.M. Petrushina and N.J. Bjerrum

Applied Energy, 2016, vol. 175, issue C, 545-550

Abstract: The conductivity of pure molten KH2PO4 salt and four mixtures with more or less water (KH2PO4–H2O and KH2PO4–KPO3 systems, respectively) were measured at temperatures of 240–320°C and under their own water vapor pressures. Molten KH2PO4 has been proven to be a promising electrolyte for an elevated temperature pressurized water electrolyzer demonstrating high conductivity of ∼0.30Scm−1 at 300°C. The conductivity data are given as polynomial functions of temperature and composition. The melting point of the pure salt under its own water vapor pressure was determined to be ∼272°C.

Keywords: Intermediate temperature pressurized water electrolyzer; Molten salt electrolyte; KDP; Elevated temperature water electrolysis; Electrolyte conductivity; Phosphate-based electrolytes (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:175:y:2016:i:c:p:545-550

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DOI: 10.1016/j.apenergy.2016.04.111

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