Electrostatic contribution to the enthalpy of charging at hematite/electrolyte interface

A calorimetry study of hematite surface reactions is reported, with special emphasis on the estimation of the electrostatic contribution to the enthal py of charging. The calorimetry titrations were performed outside the point of zero charge region where the electrostatic contribution is significant, The results were interpreted by the surface complexation model, The interp retation enabled the evaluation of standard protonation and deprotonation e nthalpies as well as the electrostatic contribution to these quantities. (C ) 1999 Academic Press.