Solid Oxide Fuel Cells (SOFCs)
National Energy Technology Laboratory
626 Cochrans Mill Road
P.O. Box 10940, MS 922-204
Pittsburgh, PA 15236-0940
National Energy Technology Laboratory
3610 Collins Ferry Road
P.O. Box 880, MS P03B
Morgantown, WV 26507-0880
Materials and Systems Research, Inc.
5395 West 700 South
Salt Lake City, UT 84104
(801) 530-4987 Ext. 30
DOE Share: $1,150,000.00
Performer Share: $0.00
Total Award Value: $1,150,000.00
Performer website: Materials & Systems Research Inc. - http://www.msrihome.com
Currently, composite cathodes are formed by directly mixing the active cathode material with electrolyte at different ratios, followed by deposition and sintering into graded functional layers. Since the effectiveness of the composite cathode (the cathode is the electrode at which oxygen ions are removed from the air supply) greatly depends on the composite microstructure and intrinsic material properties, solid oxide fuel cell (SOFC) cell fabrication processes must be engineered to ensure the electrode micro-structural characteristics have continuous phases, open and continuous pores, well-linked (sintered) cathode particles, and a long triple phase boundary.
This project will develop a cost-effective vacuum-pressure infiltration thermal treatment (VPIT) technique to improve SOFC cathode performance and longevity through the impregnation of an inexpensive electro-catalyst precursor into a cathode backbone. Upon calcination (a thermal treatment process) at reduced temperatures, a thin but continuous network of nano-sized catalysts is formed, covering the cathode backbone with enlarged catalytic surface area and heterogeneous microstructure. This enhances both the oxygen exchange rate and oxygen ion transport rate on the cathode surface. The reduced temperature calcination will greatly improve the stability of the cathode.
In Phase I, the vacuum-assisted infiltration apparatus and the infiltration protocol will be developed and validated using two sizes of cell test apparatus: button cells and short stacks with 100 square centimeters per-cell active areas. Catalyst distribution and morphology will be investigated via advanced X-ray diffraction and radiographic techniques. Phase II will support manufacturing scale-up to meet cost goals, and will include kilowatt-scale stack validation.
Program Background and Project Benefits
The U.S. Department of Energy (DOE) is developing the next generation of efficient fossil fuel technologies capable of producing affordable electric power with near-zero emissions. The Solid Oxide Fuel Cell (SOFC) program at DOE’s National Energy Technology Laboratory (NETL) is focused on developing low-cost, highly efficient SOFC power systems that are capable of simultaneously producing electric power, from either natural gas or coal, with carbon capture capabilities. Research is directed towards the technologies that are critical to the commercialization of SOFC technology. To successfully complete the development of SOFC technology from the present state to the point of commercial readiness, the SOFC Program efforts are aligned into three Key Technologies:
(1) Anode, Cathode, and Electrolyte (AEC) Development
(2) Atmospheric Pressure Systems
(3) Pressurized Systems
The AEC Development Key Technology is R&D in nature whereas the other two, Atmospheric Pressure Systems and Pressurized Systems, are focused on the development, demonstration, and deployment of SOFC power systems.
The AEC Development Key Technology consists of projects that will lead to substantially improved power density, enhanced performance, reduced degradation rate, and more reliable and robust systems. Research is focused on the technologies critical to the commercialization of SOFC technology, such as cathode performance, gas seals, interconnects, failure analysis, coal contaminants, fuel processing, and balance-of-plant components. Research is conducted at universities, national laboratories, small businesses, and other R&D organizations.
Materials & Systems Research, Inc. will work to enhance solid oxide fuel cell performance through the infiltration of active nano-catalysts into cathode backbones, while leveraging well-established solid oxide fuel cell fabrication techniques for a scaling-up a proof-of-concept demonstration. The team will develop a vacuum infiltration process for adding catalysts to solid oxide fuel cell cathodes. The infiltration apparatus and protocol will be developed. Success will be validated in button cell and short stack testing. If successful, fuel cell performance and cost would be improved helping to commercialize a technology capable of generating electricity very efficiently with near-zero emissions.
Project Scope and Technology Readiness Level
The goal of this project is to develop a vacuum infiltration process for adding catalysts to SOFC cathodes. Current Phase II project objectives are as follows:
- Perfect the VPIT process via:
- optimization of catalyst loading level,
- construction of catalyst optimal structure,
- implementation of degradation mitigation strategies, and
- refinement of the single-step infiltration apparatus for large cell application.
- Characterize performance enhancement resulting from infiltration treatment.
- Conduct techno-economic evaluation of the single-step VPIT process.
The Technology Readiness Level (TRL) assessment identifies the current state of readiness of the key technologies being developed under the DOE’s Clean Coal Research Program. In FY 12, this project was not assessed.
The TRL assessment process and its results including definition and description of the levels may be found in the "2012 Technology Readiness Assessment-Analysis of Active Research Portfolio".