2 - 1-- Lecture #2 --MEM 415 FUEL CELL ENGINESFUEL CELL...

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Unformatted text preview: 1-- Lecture #2 --MEM 415 FUEL CELL ENGINESFUEL CELL BASICS & ELECTROCHEMISTRYMEM 415 Lecture #2Dr. E. Caglan KumburAssistant Professor of Mechanical EngineeringOffice: Curtis 160 Ph: 215.895.5871e-mail: eck32@drexel.edu-- Jan 10, 2010 --Summary of Last LectureSummary of Last Lecture---- Class Demo QuestionsClass Demo Questions1) What are the advantages of fuel cells?2) Difference between Heat Engines and Electrochemical Engines?MEM 415 Lecture #22Summary of Last LectureSummary of Last Lecture---- Class Demo QuestionsClass Demo Questions3) Difference between Fuel Cells and Batteries?4) What are the fuel cell application areas?MEM 415 Lecture #2SummarySummary---- Class Demo QuestionsClass Demo Questions5) What are the challenges that fuel cell faces today? 6) How do we generally categorize fuel cells? Types? MEM 415 Lecture #23SummarySummary---- Class Demo QuestionsClass Demo QuestionsSpace applications Must run on pure oxygen without CO2High efficiency, low CO260-250oC*Solution of Alkaline Most Promising ApplicationsDisadvantagesAdvantagesMajor PoisonOperating Temp.Electrolyte MaterialFuel Cell TypeSpace applications Must run on pure oxygen without CO2High efficiency, low CO260-250oC*Solution of Alkaline Most Promising ApplicationsDisadvantagesAdvantagesMajor PoisonOperating Temp.Electrolyte MaterialFuel Cell TypeMany different types available. They are suited for different applications.Stationary power with cogenerationContinuous power applicationsLong start-up timeDurability under thermal cyclingInactivity of electrolyte below ~600oCCO tolerantFuel flexibleHigh quality waste heatInexpensive catalystSulfur 600-1000oCyttria (Y2O3) stabilized zirconia (ZrO2) Solid Oxide Fuel Cell(SOFC)Stationary power Electrolyte dissolves cathode catalyst CO tolerantSulfur600-800oCmolten alkali Molten Premium stationary powerLow power density, expensivePlatinum catalyst usedSlow start-upLoss of electrolyte1-2% CO tolerantGood quality waste heat Demonstrated durabilitySulfur, high levels of CO160-220oC Solution of phosphoric acid in porous silicon carbide matrix Phosphoric Acid Fuel Cell(PAFC)with pure O2/H2availablecontaminantoxygen reduction reaction losses *modern AFCs < 100oCpotassium hydroxide in water Fuel Cell (AFC)Stationary power with cogenerationContinuous power applicationsLong start-up timeDurability under thermal cyclingInactivity of electrolyte below ~600oCCO tolerantFuel flexibleHigh quality waste heatInexpensive catalystSulfur 600-1000oCyttria (Y2O3) stabilized zirconia (ZrO2) Solid Oxide Fuel Cell(SOFC)Stationary power Electrolyte dissolves cathode catalyst CO tolerantSulfur600-800oCmolten alkali Molten Premium stationary powerLow power density, expensivePlatinum catalyst usedSlow start-upLoss of electrolyte1-2% CO tolerantGood quality waste heat Demonstrated durabilitySulfur, high levels of CO160-220oC Solution of phosphoric acid in porous silicon carbide matrix Phosphoric Acid Fuel Cell(PAFC)with pure O2/H2availablecontaminantoxygen reduction...
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This note was uploaded on 04/26/2011 for the course MEM 415 taught by Professor Kumbur,emin during the Spring '11 term at Drexel.

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2 - 1-- Lecture #2 --MEM 415 FUEL CELL ENGINESFUEL CELL...

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