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Methanol permeability in perfluorosulfonate proton exchange membranes at elevated temperatures

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Abstract

A simple electrochemical method for the measurement of the permeability of methanol in proton exchange membranes equilibrated with a supporting liquid electrolyte at elevated temperatures is proposed. Carbon supported platinum working electrodes are placed to both sides of the membrane sample and serve as concentration sensors. Methanol is added to one or both sides of the membrane and the permeability is calculated from the time responses of anodic peak currents on the two working electrodes. Experimental results are given for Nafion® 117 perfluorosulfonate membrane in 2.Om H2SO4 at 60 and 70°C.

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Abbreviations

A :

geometric area (cm2)

c :

concentration (mol cm−3)

D :

diffusivity (cm2 s−1)

E :

potential vs RHE (V)

ΔE :

activation energy (kJ mol−1)

H :

Henry law constant (atm mol−1 cm3)

j :

current (mA)

K :

rate constant (cm3 s−1)

K * :

partition coefficient

l :

thickness (cm)

N :

molecular flux (mol cm−2 s−1)

p :

pressure (atm)

t :

time, (s)

T :

temperature (°C)

V :

volume (cm3)

ε:

volume fraction

τ:

time constant (s)

d:

diffusion

e:

evaporation

i:

index, 1: glass cell; 2: sample holder

max:

maximum

Me:

methanol

ref:

reference

w:

water

t:

total

0:

initial double layer charging

1:

anodic peak

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Author notes

  1. P. S. Kauranen

    Present address: Department of Technical Physics, Helsinki University of Technology, FIN-02150, Espoo, Finland

Authors and Affiliations

  1. Department of Chemistry, Odense University, Campusvej 55, DK-5230, Odense M, Denmark

    P. S. Kauranen & E. Skou

Authors
  1. P. S. Kauranen
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  2. E. Skou
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Kauranen, P.S., Skou, E. Methanol permeability in perfluorosulfonate proton exchange membranes at elevated temperatures. J Appl Electrochem 26, 909–917 (1996). https://doi.org/10.1007/BF00242042

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  • DOI: https://doi.org/10.1007/BF00242042

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