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4.10 Consider a hydrogen fuel cell with 75% N2, 19% oxygen, and 6% H2O in the cathode at 1 atm total pressure. If the oxygen mole fraction is reduced because water vapor has been added to the cathode (new balance 15% O2, 25% H2O, and 60% N2), the expected OCV will fall. To counter this loss, you suggest changing the cathode pressure. To what value must your cathode total pressure be changed to in order to maintain the OCV? Conditions on the anode are not to be changed.

4.10 Consider a hydrogen fuel cell with 75% N2, 19% oxygen, and 6% H2O in the cathode at 1 atm total pressure. If the oxygen mole fraction is reduced because water vapor has been added to the cathode (new balance 15% O2, 25% H2O, and 60% N2), the expected OCV will fall. To counter this loss, you suggest changing the cathode pressure. To what value must your cathode total pressure be changed to in order to maintain the OCV? Conditions on the anode are not to be changed.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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4.10 Consider a hydrogen fuel cell with 75% N2, 19% oxygen, and 6% H2O in the cathode at 1 atm total pressure. If the oxygen mole fraction is reduced because water vapor has been added to the cathode (new balance 15% O2, 25% H2O, and 60% N2), the expected OCV will fall. To counter this loss, you suggest changing the cathode pressure. To what value must your cathode total pressure be changed to in order to maintain the OCV? Conditions on the anode are not to be changed.
Transcribed Image Text:4.10 Consider a hydrogen fuel cell with 75% N2, 19% oxygen, and 6% H2O in the cathode at 1 atm total pressure. If the oxygen mole fraction is reduced because water vapor has been added to the cathode (new balance 15% O2, 25% H2O, and 60% N2), the expected OCV will fall. To counter this loss, you suggest changing the cathode pressure. To what value must your cathode total pressure be changed to in order to maintain the OCV? Conditions on the anode are not to be changed.
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