Question

1. There are several voltages defined as follows: 2F Explain the meaning of each. 2. There are several efficiencies defined in a fuel cell as follows: Maximum possible (ideal) efficiency or n. f x 100 Ah Cell Actual Efficiency na = eiency'a -x100 Fuel Cell Actual Efficiency na H pas Discuss the meaning of each and explain which you would use when. 3. Derive the Nernst equation for a methane/oxygen fuel cell in terms of the pressures. Anode: CH4 + 2H20(0) + CO2 + 8H+ + 8e Cathode: 8H* + 8e +202 + 4H2O(0) Overall reaction: CH4 + 202 +2H20(0) + CO2(C) means liquid

Answer 1

V - The potential difference between two point is called voltage - Unika i volte. So, we use symbol Voflen for voltage 2 DG, nFt Fell potential difference between a half cells in Slechochemical cell fralda s no o moles of electrons frons tered hF here na 2 moles F> Faradays cond lant ( 96500 cmol on Gibbs free eneregy, 2 3) V → is the collector Voltage 4 E potential difference between a half cells in elechochemical cells 2) The maximum efficiency limit of a fuel cell often referred to 06 the thermodynamic efficiency is calculated as; max G x 100