Difference between overpotential and standard emf
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Potential differenceIt is the potential difference between two electrodes when no current is flowing in the circuit.It is the difference of the electrode potentials of the two electrodes when the cell is under operation.It is the maximum voltage that the cell can deliver.It is always less then the maximum value of voltage which the cell can deliver.It is responsible for the steady flow of current in the cell.
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In electrochemistry, overpotential is the potential difference (voltage) between a half-reaction's thermodynamically determined reduction potential and the potential at which the redox event is experimentally observed. The term is directly related to a cell's voltage efficiency.
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