Surface Potential of Polycrystalline Hematite in Aqueous Medium

International Journal of Electrochemistry

FilipStipić¹  AtiđaSelmani¹  TajanaPreočanin¹  NikolaKallay¹ 

DOI  :  10.4061/2011/412731

学科分类：化学（综合）

来源: Hindawi Publishing Corporation

【 摘 要 】

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 aslogK1∘=11.3;logK2∘=2.8.

【 授权许可】

Unknown