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【正文】 st Equation NTU ME NTU ME NTU ME ? The ideal efficiency of a fuel cell, operating reversibly, is then, ? At standard condition (298K, 1atm), thermal energy (?H ) in the hydrogen/oxygen reaction is , and the free energy for useful work is 237KJ/mole, therefore, ? The thermal efficiency of a hydrogen/oxygen can be written in term of the actual cell voltage ? Activation losses are caused by sluggish electrode kiics. It is possible to approximate the voltage drop by a semiempirical equation, called the Tafel equation. ? α is the electron transfer coefficient of the reaction at the electron being addressed ? i0 is the exchange current density ? Ohmic losses occur because of resistance to the flow in the electrolyte and resistance to the flow electrons through the electrode.
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