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Hydrogen Fuel Cells
Transcript of Hydrogen Fuel Cells
-Liquid hydrogen is cold if it escapes and can cause frostbite How does the Climate Effect What is the appeal of hydrogen fuel cells to an individual consumer? What is the appeal of hydrogen fuel cells to a commercial consumer? Fuel Flexibility Hydrogen Fuel Cell Why is hydrogen fuel a
good choice? Contains more energy than any other fuel on an equal mass basis Water is it's only byproduct CONS PROS How does Hydrogen fuel compare to gasoline? Cost If mass produced, would cost $2/gallon Cost of Infrastructure could increase consumer cost Can be 3x the cost of natural gas per unit of energy Like all fuels, hydrogen is a safe fuel when handled properly Like other fuels, hydrogen has high energy content and must be handled with care. Just like gasoline and other fuels, hydrogen is a flammable substance The science behind it hydrogen gas is broken into protons and electrons
2H2 4H+ + 4e− These hydrogen ions and electrons produce water and heat, both of which are removed from the fuel cell.
O2 + 4H+ + 4e− 2H2O Most common method of producing it Hydrogen fuel is fed into the "anode" Oxygen (or air) enters the fuel cell through the cathode The proton passes through the electrolyte Electrons create a separate current before they return to the cathode as water. Emissions from this type of a system would still be much smaller than emissions from the cleanest fuel combustion processes Types of Development •Since hydrogen is an energy carrier, not a source, energy is required to separate it from other compounds. •Natural Gas Reforming
•High-Temperature Water Splitting:
•Photobiological Water Splitting
•Photoelectrochemical Water Splitting In conclusion . . . Thank you for listening to our presentation of . . . Benefits Risks -Pollute less and are more energy efficient - Cost more to produce hydrogen than is earned by using hydrogen in fuel cells •In a fuel cell the energy available is called Gibbs’s energy
•A hydrogen fuel cell operating at 25°C has a maximum theoretical efficiency of 83%. Efficiency Environmental Factors - Auto Emissions Hydrogen is non-toxic, so if released it does not present a health hazard to humans and its effect on the environment is almost nothing