Fuel Cell Handbook (Seventh Edition)
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Read (open NETL PDF, loop-3 pass 42), section 2.1–2.2. 'The ideal efficiency of a fuel cell, operating reversibly, is then η_ideal = ΔG/ΔH' (2-14); for H₂ + ½O₂ → H₂O(l) 'at standard conditions of 25 °C (298 K) and 1 atmosphere, the thermal energy (ΔH) in the hydrogen/oxygen reaction is 285.8 kJ/mole, and the free energy available for useful work is 237.1 kJ/mole. Thus, the thermal efficiency of an ideal fuel cell operating reversibly on pure hydrogen and oxygen at standard conditions is: η_ideal = 237.1/285.8 = 0.83' (2-17); 'for direct electrochemical oxidation of carbon ΔG is larger than ΔH, and consequently the ideal efficiency is slightly greater than 100 % when using this definition'. The ideal cell voltage at 1 atm, 25 °C is 1.229 V.
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Physical Transformation Atlas (2026). source source:fuel-cell-handbook-2004: Fuel Cell Handbook (Seventh Edition). Dataset revision rbfbfcbb70e57 (hash of the canonical data). https://physical-transformation-atlas.wldud5192.workers.dev/source/fuel-cell-handbook-2004
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