Abstract
The relation between the phase-shift profile fur the intermediate frequencies and the Langmuir adsorption isotherm at the poly-Ir/0.1 M aqueous electrolyte interface has been studied using ac impedance measurements, i.e., the phase-shift methods. The simplified interfacial equivalent circuit consists of the serial connection of the electrolyte resistance , the faradaic resistance , and the equivalent circuit element of the adsorption pseudoca-pacitance . The comparison of the change rates of the are represented. The delayed phase shift depends on both the cathode potential (E) and frequency (f), and is given by . The phase-shift profile for the intermediate frequency (ca. 1 Hz) can be used as an experimental method to determine the Langmuir adsorption isotherm . The equilibrium constant (K) for H adsorption and the standard free energy of H adsorption at the poly-Ir/0.1 M electrolyte interface are and 21.1kJ/mol, respectively. The H adsorption is attributed to the over-potentially deposited hydrogen (OPD H).
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