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Hydrogen/Fuel Cells

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