Naslov
Solid state electrochemical reactions in systems with miscibility gaps

Autori
Lovrić, Milivoj ; Hermes, Michael ; Scholz, Fritz

Izvornik
Journal of solid state electrochemistry (1432-8488) 4 (2000), 7; 394-401

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
miscibility gap; mixed phases; cyclic voltammetry; solid state electrochemistry

Sažetak
Cyclic voltammograms of electroactive solid compounds with partial immiscibility between the oxidized and reduced phases can exibit splitting of the peaks. It the free energy of transformation between the oxidised and reduced phases is small, the formal potentials of the redox pair will be almost the same in both solid phases. This results in an inert range in which no appreciable electrochemical activity is possible. The kinetic implications of the situation have been analysed in relation to the width of the miscibility gap. The diffusion of ions in the particle, which is hindered by the immiscibility, can be produceed when a trasition zone between the two phases exists in which the crystal structure is charged. If there is no such trasition zone the voltammogram will display several spikes, which are caused by the collapse of concentration barriers at the sharp interfaces between the two phases in the mixed crystals.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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