摘要： Oxides of La0.8Sr0.2Mn1−xRuxO3−δ (LSMR) (x = 0, 0.25, 0.50, 0.75, or 1.0) were prepared to fabricate cathodes in solid oxide fuel cells. The crystal structure changed from trigonal (x = 0 or 0.25) to a mixture of trigonal and orthorhombic (x = 0.5) and to orthorhombic (x = 0.75 or 1.0). X-ray photoelectron spectroscopy analysis after electrochemical testing indicated that the relative concentrations of Ru4+ to Ru6+ and Mn4+ to Mn2+ influence the performance of a single cell. The transformation from Ru4+ to Ru6+ releases two electrons but that from Mn4+ to Mn2+ creates two electron holes (an oxygen vacancy). The relative concentrations in LSMR were determined using the stoichiometric ratio (x) of Ru, and then, the concentrations of electrons and electron holes for influencing the cathode electrochemical catalytic reactivity were estimated. x = 0.25 represented the better cell performance, and Ru may stabilize the LSMR grain size during electrochemical testing. ► The stoichiometric ratio (x) of Ru at 0.25 represented the better cell performance. ► The crystal structure changed from trigonal to orthorhombic by different Ru content. ► The varying of valence for Mn and Ru influence the performance of a single cell. ► The Ru doping into LSM may stabilize the grain size of LSMR and porous structure. 出版者： Kidlington: Elsevier Ltd 出版日期： 2013-02-06 出處： International journal of hydrogen energy, 2013-02, Vol.38 (3), p.1714-1724 資源來源： ScienceDirect (Elsevier) Journals 版權： 2012 Hydrogen Energy Publications, LLC. 版權： 2014 INIST-CNRS 識別號： ISSN: 0360-3199 識別號： EISSN: 1879-3487 識別號： DOI: 10.1016/j.ijhydene.2012.08.111 識別號： CODEN: IJHEDX
