Hydrogen/Fuel Cells
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Non rechargeable/Primary | provides electrical energy until chemicals have reacted to extent that V fails
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| Rechargeable/Secondry | chemicals react
recharging reaction is reversed and chemicals are regenerated
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| Examples of secondry cell | Ni/Cadmium
Li ion/Li polymer (laptops)
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| Fuel Cells | external supplies fuel+oxidant
continual electrical supply as long as reactants supplied
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| Which terminal in the fuel cell provides electrons? | -ve terminal
(no recharging required)
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| What does a fuel cell required | electrolyte
fuel/oxidants
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| Where does the hydrogen come from for hydrogen cars? | H2g/hydrogen rich fuels
(methanol, natural gas, petrol)
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| How is the hydrogen generated? | Fuel reacted with water to produce hydrogen and CO2
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| Why is methanol used as a fuel? | easier to store than a gas
generated from biomass
CO2 is produced
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| Advantages of Hydrogen | less CO2
less pollution/ air pollutants
greater efficiency/ fuel consumption
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| How is hydrogen stored | liquid under pressure
adsorbed
absorbed into lattice structure
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| Limitiations | Toxic chemicals in fuel cells
Fuel cells have a limited lifetime
Absorbers/adsorbers limited lifespan
Feasibility of storing a pressurised liquid
Large scale storage and transport (cost effective/infrastructure)
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| Hydrogen economy | hydrogen must be accepted as a fuel
problems with handling and maintanence
engergy carrier not energy source
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| What is a battery | more than one cell joined together
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| example of primary batteries | zinc-carbon
alakaline
lithium
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| Examples of secondary batteries | Li ion
lead-acid
nickel-cadmium
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| During the reverse reaction what happens to the products from the forward reaction | products stick to electrodes not dispearsed into the electrolyte
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Created by:
07blandforderin
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