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Need to Find OCV for H2O2 Fuel Cell

  • Thread starter Kuriger9
  • Start date
  • #1
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Homework Statement



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


Homework Equations



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

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:
 

Answers and Replies

  • #2
Borek
Mentor
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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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