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Non-faradic electrochemical modification of catalytic activity (NEMCA effect), also known as electrochemical promotion of catalysis (EPOC), is used to describe the increase in catalytic activity (up to 90-fold) and selectivity of a gas exposed electrode on a solid electrolyte cell upon application of a potential. This phenomenon is well documented and has been observed on various surfaces (Ni, Au, Pt and Pd) supported by O2-, Na+ and proton conducting solid electrolytes.
Vayenas, C.G.; S.I. Bebelis, I.V. Yentekakis, S.N. Neophytides (1997). "Electrocatalysis and Electrochemical Reactors". In P. Gellings, H. Bouwmeester. CRC Handbook of Solid State Electrochemistry. CRC Press. ISBN0-8493-8956-9. OCLC35033723.