2017 Fiscal Year Annual Research Report
Developing efficient stable oxygen electrode materials in reversible SOFC/SOECs by grain boundary engineering
| Project/Area Number |
17J02103
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| Research Institution | Kyushu University |
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Principal Investigator |
CHEN TING 九州大学, 工学府, 特別研究員(DC2)
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| Project Period (FY) |
2017-04-26 – 2019-03-31
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| Keywords | oxygen surface exchange / thin films / oxygen electrodes / optical absorption / in situ crystallization / crystallinity / degradation / grain boundary |
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| Outline of Annual Research Achievements |
Under the support of JSPS fellowship, my research mainly involves the growth of thin films (PLD), structural characterization (XRD, AFM, SEM, TEM), as well as assessing the oxygen surface exchange kinetics (Optical Transmission Relaxation (OTR), Impedance Spectroscopy) and the surface chemistry (XPS) on oxygen electrode materials for reversible SOFCs/SOECs. I have been working on three main topics: (a) The impact of microstructure and crystallinity on surface exchange kinetics of Fe-doped SrTiO3; (b) Understanding the crystallization of thin films of other various crystal-structures; (c) In-depth studies into the crystallization of Fe-doped SrTiO3 thin films. Part of the work has been published. The other two papers are in preparation.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
In my proposal, my goal is to fully understand the roles of microstructure (grain size, crystallinity) on surface exchange kinetics of SrTi1-xFexO3-δ (MIEC) thin film oxygen electrodes at a fundamental level. I have demonstrated that high oxygen surface exchange kinetics require both a high degree of crystallinity and minimal Sr segregation (surface chemistry of the films) to the surface. This could be achieved by crystalizing amorphous thin films in-situ while measuring the surface exchange coefficient. I have also found the crystallization can benefit the surface exchange kinetics, showing high performance oxygen electrode, and successfully extend the application of optical relaxation method to other oxide materials.
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| Strategy for Future Research Activity |
(1) Finish the manuscript of crystallization of thin films of other various crystal-structures work;
(2) Finish the manuscript of transport properties of grain boundaries in La1-xSrxGa1-yMgyO3-δ, which will be helpful to decrease the delamination between the oxygen electrode and electrolyte.
(3) In-depth studies into the crystallization of Fe-doped SrTiO3 thin films, and finish the manuscript;
(4) Employ the amorphous STF35 thin film as catalyst or oxygen electrode, and develop high performance low-intermediate temperature (400-650 ºC) reversible SOFCs/SOECs.
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