|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||In Situ Imaging and Spectroscopy of Carbon Deposition on a Ni/CeO2 Catalyst
||Ethan L Lawrence, Peter A Crozier
|On-Site Speaker (Planned)
||Ethan L Lawrence
Long-term stability of solid oxide fuel cells (SOFC) may be limited by carbon deposition onto the active anode catalyst, causing deactivation of the ceramic-metal (cermet) composite catalyst structure. <I>In situ</I> studies detailing fundamental processes occurring during carbon deposition are essential to designing better catalysts. An FEI Titan environmental transmission electron microscope (ETEM) was used to study gas-solid interactions of a model Ni/CeO<SUB>2</SUB> catalyst with two carbon source gases, ethane (C<SUB>2</SUB>H<SUB>6</SUB>) and ethylene (C<SUB>2</SUB>H<SUB>4</SUB>), to gain insight into carbon deposition processes relevant to SOFCs. During gas exposure, <I>in situ</I> electron energy-loss spectroscopy (EELS) was used to monitor the valence state of Ce<SUP>3+/4+</SUP>, which varies with the oxygen content of the ceria. Ce valence can thus be used to interpret carbon deposition behaviors in terms of oxygen deficiency of the ceria support. <I>In situ</I> results and spectroscopic data highlighting the relationship between the metal-support interaction and carbon deposition will be presented.