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| phosphoric acid-soaked matrix |
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| alkali carbonate-soaked matrix |
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methanol+water and O2 in
CO2 and H2O out |
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H2/CH4/CO and O2 and CO2 in
H2O out |
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H2/CH4/CO and O2 in
H2O out |
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| a disadvantage of low temp. FC is ___ |
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| ___ and ___ FC can use fuels other than H2 |
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| the lowest efficiency FC is ___ because... |
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PAFC
because it can't run at high current density |
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| any FC can be run as an EC, but... |
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| ..you may need different catalytic materials |
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| one of the most important characteristics of FCs is ___ |
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| most promising types are ___ and ___ |
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| There are not any viable intermediate temperature, ___ to ___ C fuel cells because... |
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220-650 C
...of a lack of the required materials |
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| require different materials |
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| can use stuff other than Pt because cathode rxn is already very fast |
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| PAFC's limiting current is ___ than PEMFC's, so power density is also ___ |
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| MCFC interesting feature is that it uses circulating ___ |
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| MCFC usually does not need ___ because of the high operating temp |
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| can use exact same setup and materials |
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| for all FCs, the membrane should be ___-conductive but not ___-conductive |
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| to be economically viable, a FC should cost ___ dollars/kW |
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| good permeability for PEMFC membrane: |
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| the MEA (membrane electrode assembly) is made of... |
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proton conductive membrane
two electrodes
gas diffusion layers (porous electrode structures) |
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| Pt catalyst load for PEMEC is ___ that of PEMFC |
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| SOFC is not sensitive to impurities because... |
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| ..it operates at a high temp |
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| PEMFC and SOFC polarization curves are ___ |
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| SOFC can use ___ as a fuel |
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