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On the conductivity of phosphoric acid electrolyte

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Abstract

The specific electric conductivity and viscosity of 7.5–100 wt% aqueous phosphoric acid electrolyte have been measured in the temperature range 25–200°C. The product of conductivity and viscosity was found to decrease exponentially with increasing temperature. This suggests that the electric conduction in phosphoric acid follows the Grotthus proton switching mechanism. The measured conductivity data were correlated by the following empirical equation:

$$\begin{array}{*{20}c} {k\mu = {\rm A} exp [BT]}\\ {A = 702.7X^{1.5} - 1734.2X^2 + 1446.5X^{2.5} - 350.7X^3 }\\ {B = - 0.010163 + 0.011634X - 0.08313X^2 }\\ \end{array}$$

wherek is conductivity in mho cm−1; μ is viscosity in centipoise;T is the absolute temperature in K; andX is mole fraction of phosphoric acid in the electrolyte. The standard deviation for the percentage difference between the calculated and experimental values of 188 data points was less than 7.5%.

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Authors and Affiliations

  1. Department of Chemical Engineering, Clarkson University, 13676, Potsdam, NY, USA

    Der-Tau Chin & Howard H. Chang

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  1. Der-Tau Chin
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  2. Howard H. Chang
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Chin, DT., Chang, H.H. On the conductivity of phosphoric acid electrolyte. J Appl Electrochem 19, 95–99 (1989). https://doi.org/10.1007/BF01039396

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  • DOI: https://doi.org/10.1007/BF01039396

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