Fuel Cells

• What is the focus of today's video?

  Hydrogen oxygen fuel cells
• What does a fuel cell convert?

  Energy between electrical and chemical forms
• 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?

  It allows ions to move through
• What is one of the most common electrolytes used?

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

  Anode and cathode
• Which electrode is negative in a fuel cell?

  Anode
• What connects the anode and cathode in a fuel cell?

  A wire
• What is the difference between electrodes in fuel cells and electrolysis?

  Opposite charge assignments
• What material are both electrodes made of?

  Porous carbon
• What is the purpose of the catalyst in the electrodes?

  To speed up the reaction
• Where does hydrogen enter the fuel cell?

  Anode compartment
• Where does oxygen enter the fuel cell?

  Cathode compartment
• What happens to water and heat after the reaction?

  They leave via the outlet
• What happens to hydrogen at the anode?

  It is oxidized
• What does hydrogen lose to become a hydrogen ion?

  An electron
• What do electrons do after being released by hydrogen?

  Pass around the wire to the cathode
• What do hydrogen ions do after being released?

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

  Oxygen
• How many hydrogen ions and electrons are needed for each oxygen molecule?

  Four hydrogen ions and four electrons
• What is produced at the cathode when hydrogen ions and electrons react with oxygen?

  Two molecules of water
• What are the two half equations in a fuel cell?

  Oxidation of hydrogen and reduction of oxygen
• What does the overall equation of the fuel cell show?

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

  The potential difference across the cell
• What is the main idea behind using fuel cells?

  To replace fossil fuel engines and batteries
• What is a major benefit of hydrogen oxygen fuel cells?

  They produce no carbon dioxide or pollutants
• Why are fuel cells considered simpler devices than batteries?

  They last longer and are less polluting
• What is a downside of storing hydrogen?

  It takes up more space than fossil fuels
• What is a safety concern regarding hydrogen?

  It is explosive when mixed with air
• What is the main problem with producing hydrogen fuel?

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

  Like and subscribe