Voltammetric Measurement of Adsorption Isotherm for Ferrocene Derivatives on Highly Oriented Pyrolytic Graphite.Reversible and specific adsorption of redox-active molecules from the electrolyte solution to the electrode surface is an important process and is often diagnosed by cyclic voltammetry (CV).  The entire voltammogram, however, is rarely analyzed quantitatively, thereby completely missing or incorrectly extracting inherent information about the adsorption isotherm.  Herein, we report CV measurements of the adsorption isotherm for ferrocene derivatives on the basal plane of highly oriented pyrolytic graphite (HOPG) to quantitatively understand the thermodynamics of ferrocene-HOPG and ferrocene-ferrocene interactions at HOPG/water interfaces.  Finite element analysis of the entire voltammogram yields the Frumkin isotherm to separately parametrize ferrocene-HOPG and ferrocene-ferrocene interactions. 
THERM