Fuel cell voltage end efficiency

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SUMMARY

Fuel cell efficiency is theoretically expected to decrease with rising temperatures; however, practical observations indicate the opposite. Higher temperature fuel cells experience reduced voltage losses, making them more advantageous despite lower efficiency. This phenomenon is documented in Table 3.1 of the referenced source by Chris Rayment and Scott Sherwin from the University of Notre Dame. The findings highlight the importance of operating conditions in optimizing fuel cell performance.

PREREQUISITES
  • Understanding of fuel cell technology and operation
  • Knowledge of thermodynamics related to energy conversion
  • Familiarity with voltage loss mechanisms in electrochemical systems
  • Ability to interpret technical tables and data
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  • Study the efficiency metrics of different fuel cell types
  • Examine the role of operating conditions in fuel cell performance
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Engineers, researchers, and students in the fields of energy systems, electrochemistry, and fuel cell technology will benefit from this discussion.

Thermo
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I know theoretically fuel cell efficiency decreases as temperature increases. But in practice it is vice versa. What is the reason of that? I couldn't find enough sources. Any kind of help is much appreciated.
 
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Thermo said:
I know theoretically fuel cell efficiency decreases as temperature increases.
Source?
 
Even though a fuel cell is more efficient at lower temperatures as shown in Table 3.1, the voltage losses are much less in higher temperature fuel cells. Therefore, it is more advantageous to run a fuel cell at a higher temperature yet lower efficiency to produce higher operating voltages.

upload_2016-11-11_0-33-33.png

Source: Chris Rayment Scott Sherwin Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame, IN 46556, U.S.A. May 2, 2003
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