C7.6 Fuel cells

Question 1

How can using hydrogen be better for global warming?

Answer 1

➢ Hydrogen + oxygen (in the air) makes water

➢ The reaction does not produce CO2

Question 2

What are the issues of hydrogen?

Answer 2

➢ Flammable
➢ Hard to store
➢ Hydrogen is sometimes produced for the cell by non-renewable sources

Question 3

What is a fuel cell?

Answer 3

➢ Cells that are fed with hydrogen and oxygen and produce water
➢ Most of the energy released in the reaction is transferred to electrical energy

Question 4

How does a fuel cell work?

Answer 4

➢ Hydrogen gas is supplied as a fuel to the negatively charge electrode
➢ Diffuses through the graphite electrode and reacts with the hydroxide ions to produce water
➢ Provides a source of electrons to an external circuit
➢ As Hydrogen loses an electron to the acthode

Question 5

What are the advantages of hydrogen fuel cells?

Answer 5

➢ Do not need to be electrically charged
➢ No pollutants are produced
➢ Can be a range of sizes for different uses