The kinetics, mass transport, and double layer features of the reversible ferro-ferricyanide redox couple were studied through intermodulated differential immittance spectroscopy (IDIS). The system is fully characterized by the quantification of the electron-transfer parameters (alpha, and i(0)), the diffusion coefficients of the redox couple (D-red and D-ox), together with the double layer capacitance and its variation (C-dl and Delta(dl)) at the open circuit potential, without the need of assuming a particular dependence of these parameters on the potential. The result was achieved by implementing the mathematical framework developed previously in a fitting procedure, which takes into account simultaneously the impedance spectrum and several differential immittance spectra of the system. (C) 2015 Published by Elsevier Ltd.