superequivalent adsorption

https://doi.org/10.1351/goldbook.S06140
This occurs when the specifically adsorbed amount of charge in the @[email protected] is higher than the charge on the metal phase, taken with the reverse sign.
Source:
PAC, 1986, 58, 437. (Interphases in systems of conducting phases (Recommendations 1985)) on page 448 [Terms] [Paper]