noun Electricity.

1915–20; over- + potential

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
However, overpotential of discharging and charging bring huge challenge for its application.
One means of protecting steel against corrosion is to coat it with a metal that has a higher hydrogen overpotential, such as tin.
The oxygen activation overpotential remains almost the same for all catalysts.
However, the overpotential arising from ohmic losses in the hydrogen sulfide are extremely high.
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