Seite - 26 - in Emerging Technologies for Electric and Hybrid Vehicles

Energies 2017,10, 1217 there. Theelectronsproducedbyoxidationat theanodeproduce theelectricity. Hydrogen isused inFCEVsbecauseof itshighenergycontent,andthefacts it isnon-polluting(producingonlywater as exhaust) andabundant inNature in the formofdifferent compounds suchashydrocarbons [4]. Hydrogencanbestored indifferentmethods foruse inEVs[4]; commerciallyavailableFCVs like the ToyotaMiraiusecylinders tostore it. Theoperatingprincipleofageneral fuel cell isdemonstrated in Figure31,whileFigure32showsahydrogenfuel cell.According to thematerialused, fuel cells canbe classifiedintodifferent types.AcomparisonamongthemisshowninTable11. Thechemical reaction governingtheworkingofa fuelcell is statedbelow: 2H2+O2=2H2O (1) Figure31.Workingprincipleof fuel cell. Fuelandoxygen is taken in, exhaustandcurrent isgenerated as theproductsofchemical reaction.Adaptedfrom[4]. Figure32.Hydrogenfuelcell configuration.Hydrogenisusedas thefuelwhichreactswithoxygen andproduceswaterandcurrentasproducts.Adaptedfrom[35]. 26