【公開日：2024.07.25】【最終更新日：2024.05.17】
課題データ / Project Data
課題番号 / Project Issue Number
23NM0082
利用課題名 / Title
Solid Oxide Cells Microstructures
利用した実施機関 / Support Institute
物質・材料研究機構 / NIMS
機関外・機関内の利用 / External or Internal Use
外部利用/External Use
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion（副 / Sub）-
キーワード / Keywords
燃料電池/ Fuel cell,電極材料/ Electrode material,電子顕微鏡/ Electronic microscope,集束イオンビーム/ Focused ion beam
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
SCIAZKO Anna
所属名 / Affiliation
東京大学 生産技術研究所
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
Naoki Shikazono,Dongxu Cui,Zewei Lyu
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
The performance of many energy devices, in particular solid oxide cell (SOC), depends greatly on their microstructure. The three dimensional quantitative evaluation of microstructural parameters can help in clarifying the dependence between microstructure and performance as well as degradation mechanisms.
実験 / Experimental
The various designs of Solid Oxide Fuel Cells (SOFC) and Solid Oxide Electrolysis Cells (SOEC) electrodes were fabricated to study the dependence between SOC performance and materials, particle morphology and electrochemical operation strategies. In order to investigate microstructural properties, the porous SOC samples were polished by the CP polishing. The sequence of cross-sectional images was acquired by a dual beam Focused Ion Beam Scanning Electron Microscopes (FIB-SEM SMF-1000) and reconstructed into 3D model. Additionally, the analysis by the Energy-dispersive X-ray spectroscopy (EDX) mapping was carried out.
結果と考察 / Results and Discussion
The focus was on the microstructure degradation due to carbon deposition in the SOFC operated with methane. The investigated parameters included influence of various SOFC materials, electrode microstructure, operation time and operation conditions such as humidity, temperature and polarization.The SOFC microstructures with deposited carbon were measured by FIB-SEM. Conventionally, the resin infiltration of porous samples and coating by carbon prior to SEM measurement are applied to achieve high quality SEM images. However, this was not possible for investigated samples as clear separation of metal, ceramic, pores and carbon phases is required. Therefore, new methods for 3D FIB-SEM measurement of highly porous samples and AI-assisted SEM image segmentation were developed.The results of the study showed that the nickel particles in cermet electrodes are pulverized by metal dusting while ceramic network is destroyed due to the internal stress caused by carbon deposition. The process is accelerated by the temperature and methane exposure time. On the other hand, the increased humidity and current density can potentially reduce carbon deposition. In particular, in the case of SOFC operation the triple phase boundaries between nickel, ceramic and pores are carbon free due to the electrochemical reaction. Additionally, careful design on the electrode microstructure and selection of ceramic ionic-conductor may further help prevent carbon deposition.
図・表・数式 / Figures, Tables and Equations
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
This work was partly supported by the New Energy and Industrial Technology Development Organization (NEDO), by Japan Society for the Promotion of Science KAKENHI [grant number 21K14090] and by Advanced Research Infrastructure for Materials and Nanotechnology in Japan (ARIM Japan).
DOI(Publication and Proceedings)：doi.org/10.1016/j.cej.2023.141680
Oral Presentations etc.：Ouyang, Z., Sciazko, A., Komatsu, Y., Nishimura, K. Shikazono, N., "Microstructural changes of active Ni fuel electrode/electrolyte interface in solid oxide fuel cells," 47th International Conference and Expo on Advanced Ceramics and Composites (ICACC2023), ICACC-P086-2023, Daytona Beach, 22-27 January (2023).
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
-
Anna Sciazko, Correlation Between Microstructure and Performance of GDC-Based Electrodes, ECS Transactions, 111, 349-356(2023).
DOI: 10.1149/11106.0349ecst
-
Dongxu Cui, Three dimensional microstructures of carbon deposition on Ni-YSZ anodes under polarization, Journal of Energy Chemistry, 87, 359-367(2023).
DOI: 10.1016/j.jechem.2023.08.035
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
- シチョンシコ アンナ.，小松洋介，志村敬彬，鹿園直毅, "ガドリニウムドープセリア固体酸化物形電解セル燃料極の性能と安定性," 第32回SOFC研究発表会講演要旨集，2023年12月14－15日，216B (2023).
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件