6.11 Hydrogen Fuel Cells

What are the inputs to a hydrogen fuel cell? (you may select more than one)

• H₂

• O₂

• H⁺

• e^-

• H₂O

What is emitted from a hydrogen fuel cell?

• H₂O

• H₂

• O₂

• e^-

• H⁺

Which of the following best describes the method of vehicle transport that is the most environmentally sustainable?

• The use of a vehicle powered by hydrogen fuel cells because there are no carbon emissions

• The use of a plug-in hybrid vehicle because the fuel sources do not release any carbon dioxide

• The use of a vehicle powered by biodiesel because it can be used in conjunction with traditional diesel

• The use of a vehicle powered by ethanol because corn is grown to produce energy rather than for human consumption

Which of the following best explains the process of electricity generation in a hydrogen fuel cell?

• At the cathode, water reacts with oxygen to release hydrogen and heat. Electricity is generated as the bonds form between hydrogen and oxygen. The by-product of the reaction is heat.

• At the cathode, hydrogen is reduced and then electrons flow to the anode to generate electricity. Oxygen is produced at the cathode. Oxygen and heat are the by-products of the reaction.

• At the anode, hydrogen is oxidized and electrons flow in a circuit to the cathode. At the cathode, oxygen reacts with the hydrogen to produce water. Water and heat are by-products of the reaction.

• At the anode, hydrogen is oxidized and electrons pass through an electrolyte to the cathode. There, the protons react with water to produce oxygen. Water and heat are by-products of the reaction.

Which of the following best describes how the use of hydrogen fuel negatively impacts the environment?

• The harvesting of hydrogen fuel from ocean sediments can result in damage to marine ecosystems and fisheries.

• The transport of hydrogen fuel requires pipelines that can negatively impact terrestrial habitats, especially when these pipelines leak.

• The combustion of hydrogen fuel releases carbon dioxide, which contributes to ocean acidification and global climate change.

• The energy needed to produce the hydrogen fuel may come from fossil fuels, whose use contributes to ocean acidification and global climate change.