level: Fuel cells
Questions and Answers List
level questions: Fuel cells
| Question | Answer |
|---|---|
| How does a fuel cell work? | Hydrogen oxidies producing electric current. |
| Give the half equation for the reactions in a fuel cell | Cathode: 2H2 -> 4H+ + 4e- Anode: O2+ 4H+ + 4e- -> 2H2O |
| Compare hydrogen fuel cells and rechargable batteries. | Hydrogen fuel cells: Advantages: -produce electricity as long hydrogen is present -do not get less efficient -source of pure water Disadvantages: -hydrogen is explosive and difficult to store -produce low pd compared to rechargable so many are needed |