Unit6 week3 lecture6part1 photovoltaiccells

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Unformatted text preview: ode cathode H2 2H+ + 2e‐ 2e‐ +2H+ + ½ O2 H2O CombusGon vs Fuel Cell Fuel cell cars are sGll in development stage because of expense of geqng fuel and of the fuel cell itself Carrying H2 around is a problem also because it is so explosive. Carry methanol and reforming it to H2 is a big area of research. Energy from Electron Transfer What is a fuel cell? Unit 6 Week 2 Lecture 5‐Part 2 Mining for H2 ? •  Where will we get all the H2 we need? •  Can’t dig it out of the ground. •  Chemically remove it from compounds •  Methane (source natural gas) •  165 kJ + CH4(g) + 2H2O(g) 4H2(g) + CO2(g) What about water as the source? •  Heat or electricity to “break” the water To use heat have to raise temperature to 5000 °C Neither is pracGcal for large amounts •  New materials are being developed convert photons to high enough energy electrons to break the water to yield H2 g...
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This note was uploaded on 03/15/2014 for the course CH 305 taught by Professor Sutcliffe during the Spring '08 term at University of Texas at Austin.

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