2017 Fiscal Year Final Research Report
Oxygen isotope-labelling imaging for high current density operation of solid oxide fuel cells
| Project/Area Number |
16K14171
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Thermal engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | 固体酸化物燃料電池 / 同位体原子ラベリング / クエンチ法 / 酸素拡散 |
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| Outline of Final Research Achievements |
The active site distribution in an LSM/ScSZ composite SOFC cathode was visualized by oxygen isotope labeling and a rapid cooling system using a helium-impinging jet. Inhomogeneous active area distribution was clearly observed in a macroscopic level, which is caused by the non-uniform configuration of current collector. In addition, the expansion of the oxygen reduction sites from a triple phase boundary to a double phase boundary enables us to identify those positions in particle scale by slow oxygen tracer diffusion in the LSM bulk. Enhanced isotope diffusion into LSM observed only near the cathode/electrolyte interface indicates that reaction sites near the interface are more electrochemically active than those at other regions. This is the first experimental work to visualize active sites in an SOFC composite electrode in microstructure scale. This method makes it possible to link the microstructure, active site distribution, and electrochemical performance of the LSM-based cathode.
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| Free Research Field |
熱工学
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