title: A solid oxide photoelectrochemical cell with UV light-driven oxygen storage in mixed conducting electrodes.
abstract: A single crystalline SrTiO3working electrode in a zirconia-based solid oxide electrochemical cell is illuminated by UV light at temperatures of 360-460 °C. In addition to photovoltaic effects, this leads to the build-up of a battery-type voltage up to more than 300 mV. After switching off UV light, this voltage only slowly decays. It is caused by UV-induced oxygen incorporation into the mixed conducting working electrode and thus by changes of the oxygen stoichiometryδin SrTiO3-δunder UV illumination. These changes of the oxygen content could be followed in time-dependent voltage measurements and also manifest themselves in time-dependent resistance changes during and after UV illumination. Discharge currents measured after UV illumination reveal that a large fraction of the existing oxygen vacancies in SrTiO3become filled under UV light. Additional measurements on cells with TiO2thin film electrodes show the broader applicability of this novel approach for transforming light into chemical energy and thus the feasibility of solid oxide photoelectrochemical cells (SOPECs) in general and of a "light-charged oxygen battery" in particular.
authors.affiliation: Institute of Chemical Technologies and Analytics , TU Wien , Vienna , Austria . Email: j.fleig@tuwien.ac.at.
authors.forename: Gregor
authors.identifier: 0000-0002-8401-6717
authors.initials: G
authors.lastname: Walch
authors.affiliation: Institute for Energy Systems and Thermodynamics , TU Wien , Vienna , Austria.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Rotter
authors.affiliation: Institute for Energy Systems and Thermodynamics , TU Wien , Vienna , Austria.
authors.forename: Georg Christoph
authors.identifier: 0000-0002-5313-0517
authors.initials: GC
authors.lastname: Brunauer
authors.affiliation: Institute for Energy Systems and Thermodynamics , TU Wien , Vienna , Austria.
authors.forename: Esmaeil
authors.initials: E
authors.lastname: Esmaeili
authors.affiliation: Institute of Chemical Technologies and Analytics , TU Wien , Vienna , Austria . Email: j.fleig@tuwien.ac.at.
authors.forename: Alexander Karl
authors.initials: AK
authors.lastname: Opitz
authors.affiliation: Institute of Chemical Technologies and Analytics , TU Wien , Vienna , Austria . Email: j.fleig@tuwien.ac.at.
authors.forename: Markus
authors.initials: M
authors.lastname: Kubicek
authors.affiliation: Institute of Atomic and Subatomic Physics , TU Wien , Vienna , Austria.
authors.forename: Johann
authors.initials: J
authors.lastname: Summhammer
authors.affiliation: Institute for Energy Systems and Thermodynamics , TU Wien , Vienna , Austria.
authors.forename: Karl
authors.initials: K
authors.lastname: Ponweiser
authors.affiliation: Institute of Chemical Technologies and Analytics , TU Wien , Vienna , Austria . Email: j.fleig@tuwien.ac.at.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Fleig