caa a22 4500 47581620X CHVBK 20180406123810.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1023/A:1003901520705 doi (NATIONALLICENCE)springer-10.1023/A:1003901520705 Faradaic impedance investigation of the deactivation mechanism of Ir-based ceramic oxides containing TiO2 and SnO2 [Elektronische Daten] [T.A.F. Lassali, J.F.C. Boodts, L.O.S. Bulhões] Ti-supported IrO2/SnO2/TiO2 coatings were prepared by thermal decomposition of the chloride precursor mixtures (400 ∘C). The effect of the replacement of TiO2 by SnO2 on the service life of the Ti/IrO2 + TiO2 coating was investigated under galvanostatic polarization at 0.8 A cm−2 in 1.0 mol dm−3 HClO4. The deactivation mechanism of the electrodes, using OER as the reaction model, was investigated through the periodic recording of voltammetric curves (VC) and impedance spectra (EIS) as a function of the anodization time. Bulk composition and morphology of the electrode coatings were investigated by energy dispersive X-ray (EDX) and scanning electron microscopy (SEM) before and after accelerated life tests. The service life showed a dependence on the electrode composition. Replacement of TiO2 by SnO2 in the Ir0.3Ti0.7O2 electrode led to a decrease in the service life of these systems above 30% mol SnO2 content. This behaviour is directly related to morphological factors and the absence of synergetic effects. The behaviour of the parameters supplied by the EIS, VC, SEM, and EDX analyses made it possible to describe the overall deactivation mechanism. Kluwer Academic Publishers, 2000 deactivation mechanism nationallicence impedance faradaic spectroscopy nationallicence iridium dioxide nationallicence tin dioxide nationallicence Lassali T.A.F. Depto de Física e Matemática, FFCLRP/USP, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto - SP, Brazil aut Boodts J.F.C. Depto de Química, Universidade Federal de Uberlândia, Campus Santa Mônica, Av. João Naves De Avila 2160, 38400-902, MG, Brazil aut Bulhões L.O.S. Depto. de Química, Universidade Federal de São Carlos/UFScar, Rodovia Washington Luizkm 235, C.P. 676, 13565-905, São Carlos, SP, Brazil aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/5(2000-05-01), 625-634 0021-891X 30:5<625 2000 30 10800 https://doi.org/10.1023/A:1003901520705 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003901520705 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lassali T.A.F. Depto de Física e Matemática, FFCLRP/USP, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto - SP, Brazil aut NATIONALLICENCE 700 1- Boodts J.F.C. Depto de Química, Universidade Federal de Uberlândia, Campus Santa Mônica, Av. João Naves De Avila 2160, 38400-902, MG, Brazil aut NATIONALLICENCE 700 1- Bulhões L.O.S. Depto. de Química, Universidade Federal de São Carlos/UFScar, Rodovia Washington Luizkm 235, C.P. 676, 13565-905, São Carlos, SP, Brazil aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/5(2000-05-01), 625-634 0021-891X 30:5<625 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer