1. Hydrogen Fuel Cell Technology: A post-lab/post-lecture Discussion Learning Goals: (What you should have learned this week) 1.The energy transformations associated with hydrogen fuel cells and hydrogen fuel cell cars; 2.The function of the PEM in a fuel cell; 3.The fuel used by a hydrogen fuel cell; 4.The by-product of hydrogen fuel cells; 5.What are the positives and negatives associated with fuel cells? Homework: 1.Moodle Lab Analysis Quiz 2.Unit Review Packet 3.Weekly BLOG: NREL/Hydrogen Fuel Cells 4.UNIT 3 EXAM on Monday!

2. Hydrogen Fuel Cell Motor Gear Chemical Electrical Mechanical The transformations that you observed (or should have) in the fuel cell car. Please remember that as the # of transfers increase, the efficiency of the system decreases!

3. How a hydrogen fuel cell works….

4. Analysis Questions Efficiency 1.The amount of energy required to generate hydrogen must always be GREATER than the amount of energy that the hydrogen can produce because of the Law of Conservation of Energy. Positives & Negatives 2/3. Hydrogen is a renewable resource. When generated using clean electricity, it has no harmful environmental impacts. Hydrogen is efficient when used in conjunction with wind turbines and solar panels as a way to store energy. The negatives associated with hydrogen all stem from the generation of hydrogen. Steam Methane Reformation and Electrolysis (when using traditional sources of electricity) lead to the emission of greenhouse gases.

5. Analysis Questions Energy Transfers 4.Chemical to Thermal to Mechanical to Mechanical to Electricity to Chemical to Electrical. Energy Transfers and Efficiency 5.As the number of transfers increases, the efficiency of the system decreases.

6. Final Thoughts… The day will come when gasoline will become too scarce and too expensive to use as a transportation fuel… The use of hydrogen fuel cell technology is going to be one PART of the alternatives that we will use to replace gasoline.