Fuel cells come in many varieties; however, they all work in the same general manner. They are made up of three adjacent segments: the, the, and the. Two chemical reactions occur at the interfaces of the three different segments. The net result of the two reactions is that fuel is consumed, water or carbon dioxide is created, and an electric current is create.
How does a hydrogen-oxygen fuel cell work?
electrochemically, rather than being burned, so the reaction takes place at a lower temperature than if it was to be burned. Energy is released as electrical energy, not (heat). Hydrogen-oxygen fuel cells are an alternative to rechargeable cells and batteries. In a hydrogen-oxygen fuel cell, hydrogen and oxygen are used to produce a voltage.
What is the overall reaction in a hydrogen-oxygen fuel cell?
The overall reaction in a hydrogen-oxygen fuel cell is: hydrogen + oxygen → water 2H 2 (g) + O 2 (g) → 2H 2 O (l) At the negative electrode: 2H 2 + 4OH - → 4H 2 O + 4e - At the positive electrode: O 2 + 2H 2 O + 4e - → 4OH - When you add these two half equations together, you get the following overall equation:
How do hydrogen ions react with oxygen ions?
The two products reach the other side of the cell, hydrogen ions through a membrane and electrons through the electrical circuit. 2. On the other side, hydrogen ions react with oxygen molecules and electrons to form water: Learn about chemical cells and fuel cells with Bitesize GCSE Chemistry (OCR Gateway).
How do two reactions occur in a fuel cell?
Two separate reactions happen, one on each side of the fuel cell. 1. On one side, hydrogen molecules lose electrons and form hydrogen ions: The two products reach the other side of the cell, hydrogen ions through a membrane and electrons through the electrical circuit.
Why were hydrogen and oxygen not circulated through the cell stacks?
The hydrogen and oxygen were not circulated through the cell stacks, but were 'dead-ended' and kept at a constant pressure so that as hydrogen and oxygen was consumed by the cells, more hydrogen and oxygen was supplied to the cells to maintain the constant pressure.
Are hydrogen fuel cells good for GCSE chemistry?
Absolutely brilliant, both my girls used it for A levels and GCSE. It's saves on paper copies, also beneficial exam questions ranked from easy to hard. It's removed a lot of stress from the exams. Use our revision notes to learn how hydrogen fuel cells work for your IGCSE chemistry exam. Understand the advantages and disadvantages of a fuel cell.