caa a22 4500 475814630 CHVBK 20180406123806.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1023/A:1003869328017 doi (NATIONALLICENCE)springer-10.1023/A:1003869328017 Impedance spectroscopy study of electrochromism in sputtered iridium oxide films [Elektronische Daten] [Th. Pauporté, R. Durand] The a.c. impedance response of sputtered iridium oxide films (SIROFs) was studied at room temperature in 1 M H2SO4 between 1 mHz and 50 mHz. The spectra were recorded as a function of applied potential in the range of electrochromic properties from 0.0 to 1.0 V vs SCE and before and after an electrochemical treatment consisting of alternatively colouring and bleaching the electrode. The spectra were analysed with help of an equivalent circuit. Between 0.4 and 1.0 V, the spectra can be interpreted as due to electrochemical proton insertion in a single phased compound. From the data, hydrogen chemical diffusion coefficients with values ranging from 2 × 10−8 to 1.1 × 10−7cm2s−1 are found. It is shown that this parameter increases fourfold after the cycling treatment and significantly decreases with the amount of inserted hydrogen. Below 0.4 V spectrum changes are observed over the intermediate frequency range studied, indicating some changes of the interfacial reactivity which remain to be clarified. Kluwer Academic Publishers, 2000 electrochromism nationallicence impedance spectroscopy nationallicence iridium oxide nationallicence proton insertion nationallicence sputtered film nationallicence Pauporté Th Laboratoire d'Électrochimie et de Physico-chimie des Matériaux et des Interfaces, UMR CNRS-INPG 5631, ENSEEG, 1130 Rue de la Piscine, Domaine Universitaire, BP75, 38402, Saint Martin d'Hères, Cedex, France aut Durand R. Laboratoire d'Électrochimie et de Physico-chimie des Matériaux et des Interfaces, UMR CNRS-INPG 5631, ENSEEG, 1130 Rue de la Piscine, Domaine Universitaire, BP75, 38402, Saint Martin d'Hères, Cedex, France aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/1(2000-01-01), 35-41 0021-891X 30:1<35 2000 30 10800 https://doi.org/10.1023/A:1003869328017 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003869328017 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pauporté Th Laboratoire d'Électrochimie et de Physico-chimie des Matériaux et des Interfaces, UMR CNRS-INPG 5631, ENSEEG, 1130 Rue de la Piscine, Domaine Universitaire, BP75, 38402, Saint Martin d'Hères, Cedex, France aut NATIONALLICENCE 700 1- Durand R. Laboratoire d'Électrochimie et de Physico-chimie des Matériaux et des Interfaces, UMR CNRS-INPG 5631, ENSEEG, 1130 Rue de la Piscine, Domaine Universitaire, BP75, 38402, Saint Martin d'Hères, Cedex, France aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/1(2000-01-01), 35-41 0021-891X 30:1<35 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer