Consider a limiting scenario in the catalyst layer of a PEFC when the conductivities of both the electronic phase (Pt/C) and electrolyte phase (ionomer), and the diffusion coefficient of the reactant (oxygen) are set to be infinitely large. a) Derive an analytical relationship of the voltage loss with the operating current density (I) and electrode cross-sectional area (Acs). Identify the mode of voltage loss in this case. [Hint: Use Tafel kinetics] b) How much does the voltage loss change if pure oxygen is used instead of air as an oxidant