Nonfaradaic electrochemical modification of catalytic activity

NonFaradaic electrochemical modification of catalytic activity, NEMCA, see electrochemical promotion NonFaradaic processes, 2 Nyquist plot, 237... 

Electrochemical pumps have also been successfully used to promote reactions catalytically. If oxygen is pumped through a zirconia cell into a reaction chamber which is, e.g., filled with hydrocarbons, not only the oxygen that is transferred, reacts. The anode itself can act catalytically. It seems that this so-called NEMCA effect ( Nonfaradaic Electrochemical Modification of Catalytic Activity 51) relies on a hindered surface reaction as a consequence of which the applied potential is translated into a concentration polarization, as reflected by the enrichment of a not fully oxidized oxygen species (e.g., O or O2") at the interface.51"53 For this species, redistribution equilibrium may be assumed that... 

Nonfaradaic electrochemical modification of catalytic activity - NEMCA... 

The electrochemical promotion effect, or nonfaradaic electrochemical modification of catalytic activity (NEMCA), is due to the controlled migration (backspillover) of ions from the solid electrolyte to the gas-exposed catalyst-electrode surface under the influence of the applied current or potential." ... 

The nonfaradaic activation of heterogeneous catalytic reactions via the NEMCA effect is a novel and promising application of electrochemistry. There is a lot of new surface chemistry to be explored with several promising technological possibilities, primarily in product selectivity modification. At the very least, the new phenomenon or electrochemical promotion will allow for a systematic study and enhanced understanding of the role of promoters in heterogeneous catalysis. 

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