Electro-osmotic drag in Nafion

May Jean Cheah, Yannis Kevrekidis, Jay Burton Benziger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Using a hydrogen pump cell, water flux, current density, and membrane resistance across a Nafion 115 membrane were measured as functions of temperature, water activity, and applied potential. Water flux increased with increase in water activity difference across the membrane. When a potential was applied, (i) the current increased with increase in applied potential up to an applied potential around 0.3V; (ii) the current did not increase with further increases in applied potential for applied potentials between 0.3V to 1V. The water flux continually increased with increase in applied potential, even when the current did not increase for applied potentials > 0.3V. Electro-osmotic drag coefficients were evaluated as a function of applied potential, water activity and temperature. The electro-osmotic drag coefficient (number of water molecules transported with the protonic current) was < 0.15 at low applied potentials and increased to around 0.35 at applied potentials of 1V. The results indicate that the conduction mechanism for protons in Nafion changes from proton hopping to electric field assisted motion of hydrated proton aggregates as the applied potential was increased.

Original languageEnglish (US)
Title of host publication10AIChE - 2010 AIChE Annual Meeting, Conference Proceedings
StatePublished - Dec 1 2010
Event2010 AIChE Annual Meeting, 10AIChE - Salt Lake City, UT, United States
Duration: Nov 7 2010Nov 12 2010

Publication series

NameAIChE Annual Meeting, Conference Proceedings

Other

Other2010 AIChE Annual Meeting, 10AIChE
CountryUnited States
CitySalt Lake City, UT
Period11/7/1011/12/10

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)

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  • Cite this

    Cheah, M. J., Kevrekidis, Y., & Benziger, J. B. (2010). Electro-osmotic drag in Nafion. In 10AIChE - 2010 AIChE Annual Meeting, Conference Proceedings (AIChE Annual Meeting, Conference Proceedings).