651 Temperature

The operating temperature of a fuel cell affects the change in entropy associated with the electrochemical reactions that occur within that cell. As operating temperature increases, the entropy change increases, leading to a reduction in the reversible potential of the fuel cell (see Figure 6.4). Therefore, with all other parameters unchanged, increases in operating temperature reduce fuel cell performance and efficiency. However, as shown in Figure 6.4, practical cell voltages tend to increase with increasing temperature due to reductions in some of the overpotentials. The increased performance of fuel cells with increasing operating temperature may be offset by practical limitations on materials, increased corrosion, electrode and catalyst degradation, and electrolyte loss.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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