CHEM - The Hydrogen-Oxygen Fuel Cell
Chemistry, Hydrogen-Oxygen Fuel Cells, Electrochemical Cell - DSE | GCE Chemistry
Jumping straight into the example👊
I- Understand the principles of hydrogen-oxygen fuel cell
II- Write the half-equation for reaction occurring at each electrode and the overall equation for reaction in a
hydrogen-oxygen fuel cell
III- State the pros and cons of a hydrogen-oxygen fuel cell
Part I- Principle of a hydrogen-oxygen fuel cell
Here is a simplified diagram👇
In the cell, three components are separated from each other by two electrodes.
The fuel (hydrogen) is supplied into the negative electrode(anode) while the oxidant(oxygen) is supplied into the positive electrode(cathode).
The electrolyte in the central compartment is hot concentrated potassium hydroxide solution
Half-equation at the anode
H2(g) + 2OH-(aq) → 2H2O(l) + 2e-
Half-equation at the cathode
O2(g) + 2H2O(l) + 4e- → 40H-
2H2(g) + O2(g) → 2H2O
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