Science & Environment
Fuel Cell Efficiency Calculator (Gibbs vs Enthalpy)
Estimate fuel cell thermodynamic efficiency and voltage efficiency from Gibbs free energy and enthalpy of reaction.
Your inputs
Change any value to update the result instantly.
Overall efficiency
47.3 %
Maximum thermodynamic efficiency
83 %
Ideal reversible cell voltage
1.229 V
Voltage efficiency
57 %
Formula and working
η_max = ΔG ÷ ΔH; η_voltage = V_actual ÷ V_ideal
- 1
Collect the inputs
Gibbs free energy change (|ΔG|) = 237.1 kJ/mol; Enthalpy change (|ΔH|) = 285.8 kJ/mol; Actual operating cell voltage = 0.7 V
- 2
Apply the formula
η_max = ΔG ÷ ΔH; η_voltage = V_actual ÷ V_ideal
- 3
Result
Overall efficiency = 47.3 %
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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