Development of a Thermal Spray, Redox Stable, Ceramic Anode for Metal Supported SOFC [electronic resource]
In this program, GE global research and GE fuel cells in Malta conducted thermal spray optimization experiments, initially focusing on a well-established ceramic anode formulation, lanthanum strontium titanate combined with gadolinium doped ceria. Powder engineering work was conducted both internall...
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Full Text (via OSTI) |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Office of the Assistant Secretary of Energy for Fossil Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2019.
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| Summary: | In this program, GE global research and GE fuel cells in Malta conducted thermal spray optimization experiments, initially focusing on a well-established ceramic anode formulation, lanthanum strontium titanate combined with gadolinium doped ceria. Powder engineering work was conducted both internally and with vendors to develop repeatable, stable, and flowable thermal spray feedstocks. Agglomerate sintering was conducted in the last phase of the project, building on earlier program work, and was used to increase run stability during the longer scaled up runs for the 410cm2 cells. Further powder engineering would be needed to fully design a powder ready for full scale manufacturing. During preliminary work on the LST-GDC electrodes, GE demonstrated 100cm2 stacks enduring multiple redox cycles with limited impact. Another key finding on the project was the identification of process conditions for two component ceramic anode thermal spray without the formation of phase impurities which were present in all early work on the program. GE global research and West Virginia University screened a large number of ceramic anode formulations, focused on identifying materials with ideal materials properties for use in SOFC anodes. In addition, synthetic scaling research was conducted to increase powder synthesis batch size several orders of magnitude during the course of project work. West Virginia University was able to show button cells using two component ceramic anodes which produced > 890mW/cm2 and even a single component SOFC button demonstrating > 1W/cm2 performance. These button cell tests show the great potential of these redox stable materials. Down-selected ceramic anode formulations were combined with the optimized thermal spray process methods to first demonstrate multiple groups of 100cm2 SOFC stacks able to achieve the power density goals for the project. GE research also quickly investigated the performance of a subset of these formulations on long term degradation tests and assessed their performance on simulated natural gas reformate. In the final phase of the program, scaling activities were employed to translate from the 100cm2 process up to 410cm2. Two large format 10-cell stack tests were completed, and one of these stacks produced 0.987kW which is one of the highest power demonstrations of ceramic anode, metal support, SOFC technology known to GE. These ceramic anode stacks had been produced with all other materials in the stack held constant, demonstrating the flexibility of the thermal spray process in scaling to very large electrode size. Sofc, Anode, Ceramic, Redox. |
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| Item Description: | Published through SciTech Connect. 06/27/2019. "doe-ge-0026169-1" Richard Hart; Ed Sabolsky; Xingbo Liu; John Zondlo; Tony Thomas; He Qi. GE. |