The chemical potential of electrons in a solid (metals, semiconductors or insulators) or in an electrolyte solution.
See: bandgap energy, conduction band, valence band
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2242 (https://doi.org/10.1351/pac199668122223)
See also:
PAC, 1986, 58, 437. 'Interphases in systems of conducting phases (Recommendations 1985)' on page 440 (https://doi.org/10.1351/pac198658030437)