Surface Potential of Polycrystalline Hematite in Aqueous Medium

Preočanin, Tajana and Stipić, Filip and Selmani, Atiđa and Kallay, Nikola (2011) Surface Potential of Polycrystalline Hematite in Aqueous Medium. International Journal of Electrochemistry. ISSN 2090-3537

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Abstract

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 logK◦1 = 11.3; logK◦2 = 2.8.

Item Type: Article
Date: 2011
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Faculty of Science > Department of Chemistry
Publisher: Hindawi
Depositing User: mag. bibl. Ana Šafran
Date Deposited: 09 Jun 2014 09:58
Last Modified: 09 Jun 2014 09:58
URI: http://digre.pmf.unizg.hr/id/eprint/2303

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