| 研究実績の概要 |
Oxide proton conductors are promising electrolytes for low-temperature solid oxide fuel and Electrolysis cells (SOFC/SOECs). This is because of their relatively high ionic conductivities at low temperatures. The main objective of the current work is the development of efficient, low-cost SOFC/SOEC protonic cathodes for reliable energy distribution. During the past year, I have made progress in two front. Firstly, the synthesis, evaluation, and screening of new protonic cathode materials, which is the primary task of phase 1, conducted in parallel with the fabrication of tri-layered half and single-cell assemblies using tape casting to evaluate the electrode performances. A series of Co-rich double and single perovskites oxide with different compositions (BaPrCo2-xNbxO6-δ, BaLaCo1-xNbxO3-δ, and BaLaCo2O6-δ where ×=0-0.2) were prepared via solid-state reaction and wet chemical solution procedures to investigate the effect of Nb content on the electrode performance. The microstructure, as well as the electrochemical properties, are also investigated and compared with those of the parent materials (BaPrCo2O6-δ, and BaLaCoO3-δ). Particular attention has been focus on the parent material to thoroughly understand and validate models for predicting protonic and/or oxygen transport properties of the cathode material. Work on proton kinetics through the bulk of both materials by isotope exchange experiments (18O and 2D2O tracers) and Time-of-Flight Secondary Ion Mass Spectrometry depth profiling is ongoing, but has been delayed by the present COVID-19 pandemic.
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| 今後の研究の推進方策 |
Continue with the synthesis, characterizations and screening of new air electrode materials. Qualitative and quantitative assessment of proton concentration in the best performing as-synthesized protonic cathode materials as well as proton transport mechanism. Protons kinetics through the bulk by Isotope-exchange. Computational modeling to gain proper understanding of the transport properties, of the materials. Develop and validate computational models for predicting protonic electrode materials.
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| 次年度使用額が生じた理由 |
1) to continue research work on phase II and for some uncompleted work in phase I of the present project proposal. The as requested amount will be spent on the following;
2) items high-grade chemical reagents for material synthesis,3) High purity gases, platinum lead wires, equipment maintenance and miscellaneous as depicted on the proposal. Two International and domestic conferences are planned for the end of the fiscal year. The purchase of a small three roll Milling device, Model: H3RM -50 ( Hantech ) for mixing, dispersing, and optimizing, the as-prepared electrode paste is also envisaged. A burnout furnace for Nitrates and hydrocarbons used for the synthesis of the electrode materials.
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