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

Author

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

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.

Suggested Citation

  • Nikiforov, A.V. & Berg, R.W. & Petrushina, I.M. & Bjerrum, N.J., 2016. "Specific electrical conductivity in molten potassium dihydrogen phosphate KH2PO4 – An electrolyte for water electrolysis at ∼300°C," Applied Energy, Elsevier, vol. 175(C), pages 545-550.
    • Handle: RePEc:eee:appene:v:175:y:2016:i:c:p:545-550
    DOI: 10.1016/j.apenergy.2016.04.111
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    1. Berg, R.W. & Nikiforov, A.V. & Petrushina, I.M. & Bjerrum, N.J., 2016. "Water vapor pressure over molten KH2PO4 and demonstration of water electrolysis at ∼300°C," Applied Energy, Elsevier, vol. 180(C), pages 269-275.

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