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Background 1.7.2 DMFCPerformance The maximum voltage that could be generated by a single DMFC is measured by the following equation: โ๐บยฐ ๐ธ = ๐ร๐น Whereas, ฮGo : Gibbs free energy of formation J/mol N: Number of electrons (1.24) F: Faradayโs constant โ 96,485 C/mol The maximum efficiency occurs under open circuit conditions at the highest cell voltage ฮ๐บยฐ ๐๐๐๐ฅ = โ๐ปยฐ Whereas, ฮHยฐ : Enthalpy of formation [9, 21]. Table โ1-1 Standard free energies of formation @ 25ยฐC and 1 atm [9] (1.25) -โ๐ฏยฐ ( ๐ฒ๐ฑ ) ๐ ๐๐๐ CH3OH(L) 238.810 O2(g) 0 CO2(g) 393.5 H2O(L) 286.0 -โ๐ฎยฐ ( ๐ฒ๐ฑ ) ๐ ๐๐๐ 166.350 0 394.4 237.2 The standard-state free energy of reaction can be calculated from the standard-state free energies of formation โ๐บยฐ =โ๐บยฐ โโ๐บยฐ (1.26) ๐(๐๐๐๐๐ข๐๐ก) ๐(๐๐๐๐๐ก๐๐๐ก) Gibbs free energy of the overall reaction โ๐บยฐ = โ868.6 โ (โ166.35) = โ702.45 ๐๐ฝ/๐๐๐ The difference between the sum of the enthalpies of the products and the sum of the enthalpies of the reactants can obtain the enthalpy of the overall cell reaction. Sirhan AL-Batty Page 39PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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