overpotentialn.
/ˌəʊvəpəˈtɛnʃl/, U.S. /ˈˌoʊvərpəˈtɛn(t)ʃ(ə)l/ = overvoltage n.
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overvoltage1907
overpotential1920
1920 Jrnl. Amer. Chem. Soc. 42 94 Overpotential varies with the nature of the electrode.
1961 A. C. Whish in G. F. Tagg Pract. Electr. Engin. II. 292 For the over~potential tests the transformer is excited in the normal way on one winding to twice or more than twice the value of its rated voltage.
1996 Philos. Trans. (Royal Soc.) A. 354 1629 This four-electron reaction is more complex than anodic hydrogen oxidation. The reaction is therefore more hindered and kinetically more demanding and overpotentials are higher.
This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).
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n.1920