What are the main byproducts of a hydrogen fuel cell?

What are the main byproducts of a hydrogen fuel cell?

• A. Electricity, water, and heat.
• B. Hydrogen and oxygen.
• C. Carbon dioxide and water.
• D. Water vapor only.

Answer: (A)

A hydrogen fuel cell converts chemical energy from hydrogen into electrical energy, and its main byproducts are water and heat, while electricity is the useful output you get to power devices. In operation, hydrogen reacts with oxygen from the air to form water (H2 + 1/2 O2 → H2O). The electrical current comes from the flow of electrons in the external circuit, and heat is released because no energy conversion is perfectly efficient. Oxygen and hydrogen are the reactants, not byproducts, and carbon dioxide would only be produced if carbon-containing fuels were burned. Water can appear as liquid or vapor depending on operating conditions, but the key point is that the system delivers electricity plus water and heat.

A hydrogen fuel cell converts chemical energy from hydrogen into electrical energy, and its main byproducts are water and heat, while electricity is the useful output you get to power devices. In operation, hydrogen reacts with oxygen from the air to form water (H2 + 1/2 O2 → H2O). The electrical current comes from the flow of electrons in the external circuit, and heat is released because no energy conversion is perfectly efficient. Oxygen and hydrogen are the reactants, not byproducts, and carbon dioxide would only be produced if carbon-containing fuels were burned. Water can appear as liquid or vapor depending on operating conditions, but the key point is that the system delivers electricity plus water and heat.