3 - 1/23/2011 1-- Lecture #3 -- MEM 415 FUEL CELL ENGINES...

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Unformatted text preview: 1/23/2011 1-- Lecture #3 -- MEM 415 FUEL CELL ENGINES FUEL CELL BASICS & ELECTROCHEMISTRY Dr. E. Caglan Kumbur Assistant Professor of Mechanical Engineering Office: Curtis 160 Ph: 215.895.5871 e-mail: eck32@drexel.edu Jan 24, 2011 MEM 415 Lecture #3-1 Common Units in Electrochemistry Common Units in Electrochemistry Current & Charge: The flow of electrical current through a circuit is analogous to the flow of The flow of electrical current through a circuit is analogous to the flow of water in a pipe. ! Charge: {C} Coulomb = total charge (electrons) passed ! 1 C = 6.28x10 18 electrons passed = 1 As ! Analogous to _________ in fluid mechanics ! Current: {A} Amp = rate of charge passing = charge/time = C/s ! Analogous to ______________ in fluid mechanics. ! Integrate in time to get total charge passed MEM 415 Lecture #3-1 1/23/2011 2 Voltage : Common Units in Electrochemistry Common Units in Electrochemistry A measure of the ___________________________. Mechanical Work Weight is moved through a distance Electrical Work done when __________ __________________ 1 V = 1 J/C = work done per unit of charge passed Potential ! Volt Waterfall Example Potential to do work for water ___________ ___________ ! This is similar in the electrochemical reactions. Can you explain why? Mechanical Energy View Height MEM 415 Lecture #3-1 Voltage Voltage ------Potential to Do Electrical Work Potential to Do Electrical Work The potential to convert chemical bond energy into electrical power is proportional to _________________________________________________ ______ Flow rate over the falls ! _______ _______ ________________ Standard Reference: Standard hydrogen electrode (SHE) = 0.0 V Since the voltage of a given reaction is a measure of potential energy, it must be...
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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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3 - 1/23/2011 1-- Lecture #3 -- MEM 415 FUEL CELL ENGINES...

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