3 - 2 - 1/23/2011 1 Lecture #3-2 (SAMPLE QUESTIONS) MEM 415...

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Unformatted text preview: 1/23/2011 1 Lecture #3-2 (SAMPLE QUESTIONS) 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 #3-2 Summary Summary Fuel Cell Basics Fuel Cell Basics 1) What are the components of fuel cells? Bipolar plate or current collector Sealing and gaskets We have these Sealing and gaskets Gas diffusion layer (GDL) or Diffusion media Catalyst layer -- Electrode Membrane We have these components for both anode and cathode side MEM 415 Lecture #3-2 1/23/2011 2 Summary Summary Fuel Cell Basics Fuel Cell Basics 2) What is the operation of a PEM Fuel Cell? Hydrogen flows in the anode flow channel. Hydrogen diffuses to the anode catalyst Hydrogen diffuses to the anode catalyst layer (CL) by passing through the DM. Reacts with Pt at the CL, and splits into proton and electron . Free electrons go back to the DM and bipolar plate to follow an external circuit to produce useful current. Hydrogen protons are transported from anode CL to cathode CL by membrane Electron coming from anode reunites at the cathode CL with the protons and oxygen (that comes from cathode bipolar plates by passing through cathode DM). Overall electrochemical reaction is completed. Water and heat are produced as a result of these reactions MEM 415 Lecture #3-2 Summary Summary Fuel Cell Basics Fuel Cell Basics Net reaction 2H 2 + O 2 => 2H 2 O Water and Heat Water and Heat Generation Generation Anode side 2H 2 => 4H + + 4e- Cathode side O 2 + 4H + + 4e- => 2H2O MEM 415 Lecture #3-2 1/23/2011 3 Summary Summary Fuel Cell Basics Fuel Cell Basics 3) What is the difference between anode and cathode? Fuel is supplied on the anode , whereas oxidizer is supplies on the cathode (e.g. H 2 is in Anode, O 2 is in Cathode for PEM) For PEM fuel cells, HOR takes place in anode, whereas ORR takes place in cathode 4) What is Membrane Electrode Assembly (MEA)? Sometimes, MEA is referred to GDL+CL+Membrane+CL+GDL Typically used meaning....
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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 - 2 - 1/23/2011 1 Lecture #3-2 (SAMPLE QUESTIONS) MEM 415...

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