Naslov
Surface Potential of Polycrystaline Hematite in Aqueous Medium

Autori
Preočanin, Tajana ; Stipić, Filip ; Selmani, Atiđa ; Kallay, Nikola

Izvornik
International Journal of Electrochemistry (2090-3529) 2011 (2011); 412731, 6

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

Ključne riječi
hematite ; surface potential ; surface equilibrium constants ; crystal electrode

Sažetak
The surface potential of polycrystalline hematite in aqueous sodium perchlorate environment as a function of pH was examined. Surface potential of hematite was obtained from measured electrode potential of a nonporous polycrystalline hematite electrode. Acidic solution was titrated with base and the backward titration with acid was performed. Substantial hysteresis was obtained which enabled location of the point of zero potential and equilibrium values of surface potentials. The theoretical interpretation of the equilibrium data was performed by applying the Surface Complexation Model and the thermodynamic equilibrium constants for the first and the second step of surface protonation was obtained as: log K1= 11.3 and logK2 = 2.8..

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA