What is the main byproduct of hydrogen fuel cells?

What is the main byproduct of hydrogen fuel cells?

• A. Water, which is non-toxic and safe for the environment
• B. Carbon dioxide
• C. Methane
• D. Oxygen

Answer: (A)

Hydrogen fuel cells turn chemical energy into electricity through an electrochemical reaction between hydrogen and oxygen. At the anode, hydrogen splits into protons and electrons; the electrons travel through an external circuit to do work, while the protons move through the electrolyte to the cathode. There, they meet oxygen and the electrons to form water. This makes water the primary byproduct, typically emitted as liquid water or water vapor depending on temperature and humidity. Since no hydrocarbon fuel is burned, carbon dioxide or methane aren’t produced in normal operation, and oxygen isn’t produced as a byproduct. The water output is environmentally friendly, which is why it’s emphasized as the main byproduct.

Hydrogen fuel cells turn chemical energy into electricity through an electrochemical reaction between hydrogen and oxygen. At the anode, hydrogen splits into protons and electrons; the electrons travel through an external circuit to do work, while the protons move through the electrolyte to the cathode. There, they meet oxygen and the electrons to form water. This makes water the primary byproduct, typically emitted as liquid water or water vapor depending on temperature and humidity. Since no hydrocarbon fuel is burned, carbon dioxide or methane aren’t produced in normal operation, and oxygen isn’t produced as a byproduct. The water output is environmentally friendly, which is why it’s emphasized as the main byproduct.