Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Impedance spectroscopy constitutes a valuable tool to probe kinetics of various processes in physical, chemical and biological systems. The interpretation of impedance data is usually done by assuming a certain equivalent electrical circuit (EC) model and obtaining the respective parameters by fitting the simulation results to the measurement data. Although the EC model is physically insightful for classical dark Mott-Schottky impedance, the EC models for impedance of illuminated photoelectrode can rapidly become ambiguous [1]. Furthermore, the impedance data should in principle allow directly obtaining reaction rates and other basic physical parameters, instead of the effective EC resistances and capacitances.
In this work, simulations of photoelectrochemical impedance spectroscopy based on drift-diffusion numerical model are presented. A procedure for extracting rate constant for water oxidation and recombination lifetime from impedance measurements is discussed. Validation of our model with measured data for hematite proves challenging due to uncertainties in values of some material parameters.
[1] M. Orazem and B. Tribollet, Electrochimica Acta 53, 7360–7366 (2008)
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