title: Mapping electrochemically driven gas exchange of mixed conducting SrTi0.7Fe0.3O3 - δand Ce0.8Gd0.2O1.9thin films by18O tracer incorporation under reducing atmosphere.
abstract: Thermally and electrochemically driven18O tracer exchange experiments in H2/H218O atmosphere were performed on SrTi0.7Fe0.3O3 - δand Ce0.8Gd0.2O2 - δthin films on single crystalline YSZ substrates. Noble metal current collectors were deposited on both films and electrochemically polarized during the exchange experiment. The resulting tracer distribution was analyzed by spatially resolved secondary ion mass spectrometry. Increased tracer fraction near the current collectors was found under cathodic polarization and decreased tracer fraction under anodic polarization. High cathodic bias leads to enhanced n-type electronic conductivity, which increases the extent of the electrochemically active zone.
authors: Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164, 1060 Vienna, Austria.
authors: Andreas
authors: A
authors: Nenning
authors: Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164, 1060 Vienna, Austria.
authors: Edvinas
authors: E
authors: Navickas
authors: Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164, 1060 Vienna, Austria.
authors: Peter
authors: P
authors: Velicsanyi
authors: Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164, 1060 Vienna, Austria.
authors: Alexander K
authors: AK
authors: Opitz
authors: Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164, 1060 Vienna, Austria.
authors: Herbert
authors: H
authors: Hutter
authors: Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164, 1060 Vienna, Austria.
authors: Jürgen
authors: J
authors: Fleig
keywords: 18O enriched water; Electrochemical water splitting; Electrochemically active zone; Isotopic surface exchange; Thin film electrode