David Driscoll PhD Comp Exam presentation
- Friday, September 18, 2015 at 3:10pm
- Roberts Hall, Room 312A - view map
Stabilization of Microstructure in High Temperature Metallic Catalysts
David Driscoll Comprehensive Examination presentation
The significance of heterogeneous catalysts to modern society is profound. On a very large scale, catalysts are critical to the future global energy infrastructure; as well as the refinement of petroleum, and the mitigation of air pollutants. In the same way, catalysis is critically important in many narrower applications such as Solid Oxide Fuel Cells (SOFCs) and high temperature electrolysis.
It has been observed that the addition of aluminum titanate (Al2TiO5, ALT) to the Ni/YSZ (SOFC anode) system stabilizes SOFC performance by preserving the Ni catalyst microstructure within the SOFC anode. Completed work has identified the formation of key phases in the Ni/YSZ/ALT system at high temperatures. Additionally Transmission Electron Microscopy has identified the spatial relation of these phases which in turn has led to a schematic model of the Ni/YSZ/ALT anchored system. Furthermore, the fabrication and testing of electrochemical cells treated with ALT has yielded insight of how this system is most effectively processed and simultaneously demonstrated the enormous performance benefit of ALT treatment.
In this work, the ultimate objective is to understand the mechanism by which increased stability is imparted to the metal catalyst. Additional experiments will investigate functional properties of the observed anchoring phases, additional processing schemes, ALT treatment effects on mechanical strength, and culminate in electrochemical cell tests based on these results.