caa a22 4500 475815890 CHVBK 20180406123810.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1023/A:1003942411733 doi (NATIONALLICENCE)springer-10.1023/A:1003942411733 Electrochemical behaviour of olefins: oxidation at ruthenium-titanium dioxide and iridium-titanium dioxide coated electrodes [Elektronische Daten] [C.L.P.S. Zanta, A.R. de Andrade, J.F.C. Boodts] The electrocatalytic behaviour of a series of olefins was studied on thermally prepared Ti/MO2 and Ti/M0.3Ti0.7O2 electrodes (M = Ru, Ir) in 1.0 M HClO4 in mixed solvent (AN/H2O, 40/60v/v). The voltammetric investigation was limited to the potential region preceding the OER on these electrodes materials (E < 1.2 V vs SSCE). Aliphatic olefins (isophorone and cyclohexene) are inactive while the aromatic olefins show a single (safrole) or two (isosafrole) oxidation peaks. The overall catalytic activity of these electrode materials is about the same for both substrates. However, when morphological effects (differences in electrode surface area) are taken into account, normalizing the geometric current density (or faradaic charge) per surface site activity, a slightly better efficiency of the active surface sites is observed for Ru-based electrodes when compared to the equivalent Ir-based materials. Partial substitution of the noble metal catalysts by TiO2 results in a synergetic effect depressing the efficiency of the active surface sites of the TiO2-stabilized electrocatalysts. The decrease with potential cycling of the substrate oxidation current is attributed to dimeric/polymeric film formation blocking the electrode surface. Reflectance and FTIR spectroscopy as well as ohmic resistance data support film formation. Kluwer Academic Publishers, 2000 catalytic activity nationallicence iridium dioxide nationallicence olefins nationallicence oxide electrodes nationallicence ruthenium dioxide nationallicence Zanta C.L.P.S. Chemistry Department, FFCLRP-USP, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto, SP, Brazil aut de Andrade A.R. Chemistry Department, FFCLRP-USP, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto, SP, Brazil aut Boodts J.F.C. Chemistry Department, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2160, 38400-902, Uberlândia, MG, Brazil aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/4(2000-04-01), 467-474 0021-891X 30:4<467 2000 30 10800 https://doi.org/10.1023/A:1003942411733 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003942411733 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zanta C.L.P.S. Chemistry Department, FFCLRP-USP, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto, SP, Brazil aut NATIONALLICENCE 700 1- de Andrade A.R. Chemistry Department, FFCLRP-USP, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901, Ribeirão Preto, SP, Brazil aut NATIONALLICENCE 700 1- Boodts J.F.C. Chemistry Department, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2160, 38400-902, Uberlândia, MG, Brazil aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/4(2000-04-01), 467-474 0021-891X 30:4<467 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer