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Hydrogen Fuel Cells

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Mary Odeshi

on 25 October 2012

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Transcript of Hydrogen Fuel Cells

What makes a good chemical fuel - It must be safe to use Hydrogen Fuel Cells? What impact will the Hydrogen fuel cells have on the local environment? ? By: Amy, Brooke, Dayo and Justine Must be reasonably cheap and readily available Should possess a moderate ignition temperature Development Timeline 1839 2008 1993 William Grove invents the first fuel cell The first bus powered by a fuel cell was launched. Honda begins leasing their fuel cell electrical vehicle. Health Factors: -Hydrogen flames are almost invisible and hard to avoid
-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
•Renewable Electrolysis
•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
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