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Need to Find OCV for H2O2 Fuel Cell

  1. Sep 8, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the open cell voltage for an H2/O2 fuel cell operating at P=1atm and T = 100°C


    2. Relevant equations

    Nernst Eq: Eo+(RT/nF)*ln[(aH2)*(aO2^1/2)/(aH2O)]

    3. The attempt at a solution

    E=1.17V+((8.314J/mol-K)*(373K))/((2e-)*(96486C/e-))*ln[(PH2*PO2^1/2)/PH2O]



    I'm not sure what the partial pressures should be such as: PH2, PO2^1/2, and PH2O.

    Any help would be MUCH appreciated. Thanks:smile:
     
  2. jcsd
  3. Sep 9, 2013 #2

    Borek

    User Avatar

    Staff: Mentor

    Chances are I need a coffee and I am missing something obvious. If so, there are already two of us.

    Activity of water is just 1. But unless there is some convention in describing fuel cells that I have no idea about, I don't see what "operating at P=1atm" is intended to mean. Perhaps it is hydrogen at 1 atm and atmospheric oxygen (so at 0.21 atm?). But if so, wording is ambiguous.
     
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