Fuel cells (Edexcel GCSE Chemistry): Flashcards

Cells producing electricity continuously from fuel supply

Need external fuel supply, not internal storage

Hydrogen-oxygen fuel cell

$2H_2 + O_2 \rightarrow 2H_2O$

$H_2 \rightarrow 2H^+ + 2e^-$

$O_2 + 4H^+ + 4e^- \rightarrow 2H_2O$

Anode to cathode via external circuit

Water only

Only produce water (non-polluting)

Less waste than non-rechargeable batteries

Highly flammable gas

Takes more space than liquid/solid fuels

Expensive and complex to develop

Space Shuttle & International Space Station

Efficient with low environmental impact