Homework-1-Solutions

Homework-1-Solutions - 1 MEM 415 Fuel Cell Engines HOMEWORK...

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1 Dr. E. C. Kumbur | MEM-415 Fuel Cell Engines MEM 415 Fuel Cell Engines HOMEWORK SET#1 ---SOLUTIONS--- 1) (20%) Consider a general fuel cell shown below. Make a list of 3-5 qualities that each of these components should have. I have listed some in class, but you can think of many more. Note: For repeating units (e.g. cathode and anode catalyst layer), you can just say “same as the other”. Solution: Answer to this question can vary, but in general, the desired features of these components can be summarized as follows: A and H: Anode & Cathode Current Collector ! Non corrosive or high resistance to corrosion ! Should be thin ! Low cost manufacturing ! Good electrical conductivity ! Good thermal expansion ! Light weight and compact B and G: Anode and Cathode Flow Channels ! Non corrosive or high resistance to corrosion ! Optimized flow channel geometry for better water and heat management ! Low cost ! Good electrical conductivity ! Good thermal expansion D: Triple Phase Boundary (Both in Anode and Cathode Electrode) ! Maximized area between catalyst particles, carbon support, ionomer (electrolyte), and void space for reactant (All these are required for electrochemical reaction and completing the ion and electron transfer) !
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2 Dr. E. C. Kumbur | MEM-415 Fuel Cell Engines C and F: Anode and Cathode Catalyst Layer ! High ionic conductivity ! High electronic conductivity ! High mass transport capability for reactant transfer and water removal ! High electrochemical active area for reaction ! Well-optimized triple phase boundary ! High resistance to corrosion ! Should require less activation energy E: Electrolyte (Membrane) ! High ionic conductivity ! Good electronic insulation ! Good dimension tolerance ! High durability ! Low cost ! Desired to function at high temperature ! Less water dependency 2) (15%) Determine the energy equivalent of one-gallon gasoline to the hydrogen in terms of kg (i.e. your answer should be one gallon gasoline is equivalent to x kg of hydrogen). You need to show your calculation. Use octane as an approximation for gasoline energy content. Hint: use
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