Fuel Cells

• What is the focus of today's video?

  How hydrogen oxygen fuel cells work
• What is a fuel cell?

  A type of electrochemical cell
• What do fuel cells convert energy into?

  Electrical energy from chemical energy
• What is the most common type of fuel cell?

  Hydrogen oxygen fuel cell
• What do hydrogen and oxygen combine to form in a fuel cell?

  Water
• What is the role of the electrolyte in a fuel cell?

  Allows ions to move through
• What is a common type of electrolyte used?

  Potassium hydroxide
• What are the electrodes in a fuel cell made of?

  Porous carbon
• Which electrode is the negative one in a fuel cell?

  Anode
• What is the function of the wire connecting the electrodes?

  Allows electrons to flow
• How does the charge of the electrodes differ in fuel cells compared to electrolysis?

  Anode is negative, cathode is positive
• What enters the anode compartment of a fuel cell?

  Hydrogen
• What enters the cathode compartment of a fuel cell?

  Oxygen
• What happens to hydrogen at the anode?

  It is oxidized
• What do hydrogen atoms lose to become hydrogen ions?

  Electrons
• What do electrons do after being released by hydrogen?

  Flow to the cathode
• What do hydrogen ions do after being produced?

  Move through the electrolyte to the cathode
• What do hydrogen ions and electrons react with at the cathode?

  Oxygen
• What is produced when hydrogen ions and oxygen react?

  Water
• How many hydrogen ions and electrons are needed to react with one oxygen molecule?

  Four hydrogen ions and four electrons
• What do the half equations in fuel cells represent?

  Oxidation of hydrogen and reduction of oxygen
• What is the overall equation for the reaction in a fuel cell?

  Combining hydrogen and oxygen to make water
• What drives the electrons around the circuit in a fuel cell?

  The potential difference across the cell
• What is the main benefit of hydrogen oxygen fuel cells?

  They produce no carbon dioxide or pollutants
• What is a downside of hydrogen as a fuel?

  It takes up more space to store
• Why is storing hydrogen considered dangerous?

  It is explosive when mixed with air
• What is a major issue with producing hydrogen fuel?

  It requires energy often from fossil fuels
• What should you do if you enjoyed the video?

  Like and subscribe
• What is the main idea behind using fuel cells in vehicles?

  To replace fossil fuel engines and batteries
• What are the pros and cons of hydrogen oxygen fuel cells?

  Pros:

  • Only require hydrogen and oxygen
  • No carbon dioxide or pollutants produced
  • Longer lifespan than batteries
  • Less polluting to dispose of

  
  

  Cons:

  • Hydrogen takes up more space
  • Explosive when mixed with air
  • Hydrogen production requires energy from fossil fuels