Naslov
Determining a Point of Zero Potential of Single-Crystal Electrode/Inert Electrolyte Interface

Autori
Zarzycki, Piotr ; Preočanin, Tajana

Izvornik
Journal of colloid and interface science (0021-9797) 370 (2012), 1; 139-143

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

Ključne riječi
single-crystal electrode; point of zero potential; common intersection point; point of zero salt effect; surface potential

Sažetak
Most of the environmentally important processes occur at the specific hydrated mineral faces. Their rates and mechanism are in part controlled by the interfacial electrostatics, which are quantitatively described using point of zero potential. In this report, we showed how this descriptor can be obtained in a single-crystal electrode potentiometric titration experiment, assuming lack of specific sorption of electrolyte ions and stable electrode response to the change in potential-determining ions concentration. Method is based on determining common-intersection point of electromotive force of the cell at a different ionic strength. Presented method is complementary to the previously reported hysteresis method [P. Zarzycki, S. Chatman, T. Preočanin, K.M. Rosso Langmuir 27 (2011) 7986-7990], and may be applied to the systems whose electrostatic response is too fast to produce a hysteresis loop in a cyclic titration experiment. Methodology is illustrated by for specific crystal faces of rutile, hematite, silver chloride and bromide.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA