Fuel Cells (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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Fuel Cells
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Fuel cell definition

Electrochemical cell that continuously produces electricity from external fuel supply

How fuel cells differ from batteries

Need external fuel vs batteries store energy internally

Most common type of fuel cell

Hydrogen-oxygen fuel cell

Overall reaction in H2H_2-O2O_2 fuel cell

2H2+O2→2H2O2H_2 + O_2 \rightarrow 2H_2O

Process at anode in H2H_2-O2O_2 fuel cell

Oxidation of hydrogen gas

Anode half-equation in H2H_2-O2O_2 fuel cell

H2→2H++2e−H_2 \rightarrow 2H^+ + 2e^-

Process at cathode in H2H_2-O2O_2 fuel cell

Reduction of oxygen gas

Only by-product of H2H_2-O2O_2 fuel cell

Water (H2OH_2O)

Environmental benefit of H2H_2-O2O_2 fuel cells

Only by-product is water (non-polluting)

Hydrogen storage challenge

Highly flammable & takes up more space than liquid fuels

Infrastructure challenge for H2H_2 fuel cells

Expensive & complex to produce, store & distribute hydrogen

Spacecraft using H2H_2-O2O_2 fuel cells

Space Shuttle & International Space Station

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Exothermic & Endothermic Reactions

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Exothermic & Endothermic Reactions

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