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Reference Number EP/J018414/1
Title Materials World Network: Tailoring Electrocatalytic Materials by Controlled Surface Exsolution
Status Completed
Energy Categories HYDROGEN and FUEL CELLS(Fuel Cells, Stationary applications) 45%;
HYDROGEN and FUEL CELLS(Fuel Cells, Mobile applications) 45%;
NOT ENERGY RELATED 10%;
Research Types Basic and strategic applied research 100%
Science and Technology Fields PHYSICAL SCIENCES AND MATHEMATICS (Chemistry) 100%
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Professor J Irvine
No email address given
Chemistry
University of St Andrews
Award Type Standard
Funding Source EPSRC
Start Date 01 February 2013
End Date 31 January 2016
Duration 36 months
Total Grant Value £298,222
Industrial Sectors No relevance to Underpinning Sectors
Region Scotland
Programme NC : Physical Sciences
 
Investigators Principal Investigator Professor J Irvine , Chemistry, University of St Andrews (99.999%)
  Other Investigator Dr M Cassidy , Chemistry, University of St Andrews (0.001%)
  Industrial Collaborator Project Contact , Pennsylvania State University, USA (0.000%)
Web Site
Objectives
Abstract This project will focus on both the development and characterization of highly electronically conducting doped titanates and vanadates which have the perovskite structure for use as the active electrochemical component in efficient, fuel flexible, and redox stable electrodes in solid oxide fuel cells (SOFC) and other high-temperature electrochemical devices. While our previous work and that of others has demonstrated the potential of the titanates and vanadates as the electronically conducting components in SOFC anodes, the performance of these electrodes is generally rather poor due to their low catalytic activity for oxidation reactions. In order to address this problem, we propose to use recently discovered exsolution/dissolution phenomena in which transition metals (e.g. Ni, Pt, Pd) move into and out of a perovskite lattice as the ambient conditions are changed from oxidizing to reducing. Exsolution of the metals from the host perovskite lattice under reducing conditions will be used to decorate the electrode surface with nanoparticles of highly catalytically active materials. Since the metals can be dissolved back into the oxide upon exposure to oxidizing conditions, dissolution/exsolution cycles can potentially be used to regenerate catalytic activity resulting in highly robust electrodes. We also propose that the exsolved metals will have a degree of anchorage to the host lattice and hence will be more stable than catalysts added by more conventional means. Developing a detailed understanding of the mechanism of the exsolution/dissolution process, its dependence on the oxide composition and defect chemistry, and the relationships between microstructure and electrochemical performance are therefore the primary goals of the proposed project. The research team will be composed of the Vohs/Gorte groups at the University of Pennsylvania and the Irvine group at the University of St. Andrews. These groups both have extensive expertise in solid-state electrochemical systems, are world leaders in fuel cell research, and bring unique experimental capabilities to the collaboration (e.g. in situ TEM at St. Andrews and coulometric titration at Penn) and also have a long track record of using collaborative approaches to achieve research goal
Publications (none)
Final Report (none)
Added to Database 10/07/12