title: Sol-gel Synthesis, Photo- and Electrocatalytic Properties of Mesoporous TiO2Modified with Transition Metal Ions.
abstract: Mesoporous nanosized titania films modified with Co2+, Ni2+, Mn3+, and Cu2+ions have been produced by templated sol-gel method and characterized by optical spectroscopy, X-ray diffraction (XRD), and Brunauer, Emmett, and Teller (BET) surface area measurement. Band gap energy and the position of flat band potentials were estimated by photoelectrochemical measurements. The films doped with transition metals possessed higher photocurrent quantum yield, as well as photo- and electrochemical activity compared to undoped samples. Mn+/TiO2(M-Co, Ni, Mn, Cu) electrodes with low dopant content demonstrate high efficiency in electrocatalytic reduction of dissolved oxygen. Polarization curves of TiO2, TiO2/Ni2+, TiO2/Co2+/3+, and TiO2/Mn3+electrodes contain only one current wave (oxygen reduction current). It means that reaction proceeds without the formation of an intermediate product H2O2.
authors.affiliation: O.Chuiko Institute of Surface Chemistry, Ukrainian National Academy of Sciences, 17 General Naumov Street, Kyiv, 03680, Ukraine. smirnat@i.ua.
authors.forename: N
authors.identifier: http://orcid.org/0000-0002-6782-7761
authors.initials: N
authors.lastname: Smirnova
authors.affiliation: O.Chuiko Institute of Surface Chemistry, Ukrainian National Academy of Sciences, 17 General Naumov Street, Kyiv, 03680, Ukraine.
authors.forename: I
authors.initials: I
authors.lastname: Petrik
authors.affiliation: Institute of General & Inorganic Chemistry of National Academy of Sciences of Ukraine 32/34 Acad, Palladin Street, Kyiv, 03680, Ukraine.
authors.forename: V
authors.initials: V
authors.lastname: Vorobets
authors.affiliation: Institute of General & Inorganic Chemistry of National Academy of Sciences of Ukraine 32/34 Acad, Palladin Street, Kyiv, 03680, Ukraine.
authors.forename: G
authors.initials: G
authors.lastname: Kolbasov
authors.affiliation: O.Chuiko Institute of Surface Chemistry, Ukrainian National Academy of Sciences, 17 General Naumov Street, Kyiv, 03680, Ukraine.
authors.forename: A
authors.initials: A
authors.lastname: Eremenko
keywords: CrVI photoreduction; Doping with transition metal ions; Electrocatalytic oxygen reduction; Mesoporous TiO2; Nanosized films