In operando observation of solid oxide cells under real operating conditions

• Project/Area Number: 21H01258
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: The University of Tokyo
• Principal Investigator: Shikazono Naoki 東京大学, 生産技術研究所, 教授 (30345087)
• Co-Investigator(Kenkyū-buntansha): 谷口 淳 東京理科大学, 先進工学部電子システム工学科, 教授 (40318225) ; 岡部 貴雄 東京大学, 生産技術研究所, 特任助教 (80649400)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000); Fiscal Year 2023: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000); Fiscal Year 2022: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2021: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
• Keywords: 燃料電池 / 電極

Outline of Research at the Start

固体酸化物形セル（Solid oxide cell, 以下SOC）では，燃料極に用いられている金属ニッケル（Ni）が移動・凝集・粗大化することが課題となっている．しかしながら，この現象は熱工学，電気化学，材料科学といった複数の学術に跨る非常に複雑な現象であり，電気化学ポテンシャル勾配，ガス雰囲気，コンポジット化される酸化物の材料やその3次元的な凹凸形状等が及ぼす影響は明らかではない．本研究では，SOCの高温in-operando（実運転環境下）観察を実施することで，微細凹凸構造内のNi移動に対する電流密度，水蒸気分圧，電解質材料や凹凸等の影響を系統的に実験評価する．

Outline of Final Research Achievements

Operando experiments were carried out in which nickel was sputtered in a pattern onto yttria stabilized zirconia (YSZ) electrolyte substrates, and laser confocal microscopy images were acquired during power generation and electrolysis conditions. The effects of operating conditions such as fuel cell operation, electrolysis operation and reversible operation, as well as the effect of the electrolyte substrate, on the dynamic shape change of the nickel were observed and evaluated using laser and optical microscopy images.

Academic Significance and Societal Importance of the Research Achievements

本研究では，多孔体を模擬した微細凹凸つきパターン電極のoperando実験を行い，固体酸化物形セル多孔体燃料極中のニッケルの移動現象における，分極の向き（発電か電解か），電流密度の大きさ，電解質材料，幾何学形状等の影響を系統的に実験評価した．実際の多孔体電極では得られない，ダイナミックな直接観察に成功しているのは当グループだけである．

Research Products

• [Journal Article] Influence of Transition Metal Elements on Ni Migration in Solid Oxide Cell Fuel Electrodes (2023)
  • Author(s): Ouyang Zhufeng、Sciazko Anna、Komatsu Yosuke、Nishimura Katsuhiko、Shikazono Naoki
  • Journal Title: Journal of The Electrochemical Society Volume: 170 Issue: 12 Pages: 124511-124511
  • DOI: 10.1149/1945-7111/ad11b2
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 固体酸化物形セル燃料極三相界面のオペランド観察 (2023)
  • Author(s): 鹿園直毅
  • Journal Title: セラミックス Volume: 58 (2) Pages: 79-82
• [Journal Article] Operando observations of active three phase boundary of patterned nickel - yttria stabilized zirconia electrode in solid oxide cell (2022)
  • Author(s): Ouyang, Z., Komatsu, Y., Sciazko, A., Onishi, J., Nishimura, K. and Shikazono, N.
  • Journal Title: J. Power Sources Volume: 529 Pages: 231228-231228
  • DOI: 10.1016/j.jpowsour.2022.231228
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Operando observation of patterned nickel - gadolinium doped ceria solid oxide fuel cell anode (2021)
  • Author(s): Komatsu, Y., Sciazko, A., Suzuki, Y., Ouyang, Z., Jiao, Z. and Shikazono, N.
  • Journal Title: J. Power Sources Volume: 516 Pages: 230670-230670
  • DOI: 10.1016/j.jpowsour.2021.230670
  • Peer Reviewed
• [Presentation] Modeling and prediction of Ni dynamic morphology change in patterned Ni/YSZ electrode (2023)
  • Author(s): Tao, J., Sciazko, A., Onishi, J., Ouyang, Z., Komatsu, Y., Yao, G., Okabe, T. and Shikazono, N.
  • Organizer: 第32回SOFC研究発表会
• [Presentation] Operando Observations of SOC Fuel Electrodes (2023)
  • Author(s): Shikazono, N.
  • Organizer: 5th Pacific Rim Conference of Ceramic Societies (PACRIM15)
  • Int'l Joint Research / Invited
• [Presentation] Effects of Transition Metal Elements on Ni Migration in Solid Oxide Cell Fuel Electrodes (2023)
  • Author(s): Ouyang, Z., Sciazko, A., Komatsu, Y., Nishimura, K. and Shikazono, N.
  • Organizer: 18th International Symposium on Solid Oxide Fuel Cells (SOFC-XVIII)
  • Int'l Joint Research
• [Presentation] Microstructural changes of active Ni fuel electrode/electrolyte interface in solid oxide fuel cells (2023)
  • Author(s): Ouyang, Z., Sciazko, A., Komatsu, Y., Nishimura, K. Shikazono, N.
  • Organizer: 47th International Conference and Expo on Advanced Ceramics and Composites (ICACC2023)
  • Int'l Joint Research
• [Presentation] 固体酸化物形燃料電池燃料極のNi移動に及ぼす遷移金属元素の影響 (2022)
  • Author(s): 欧陽朱峰，Sciazko A.，小松洋介，西村勝彦，鹿園直毅
  • Organizer: 第31回SOFC研究発表会
• [Presentation] In-Operando Observations of Ni-YSZ Patterned Fuel Electrodes Under SOFC and SOEC Operations (2021)
  • Author(s): Ouyang, Z., Komatsu, Y., Sciazko, A., Nishimura, K. and Shikazono, N.
  • Organizer: 17th International Symposium on Solid Oxide Fuel Cells (SOFC-XVII)
  • Int'l Joint Research
• [Presentation] Super-Resolved in-Operando Observation of SOFC Pattern Electrodes (2021)
  • Author(s): Yamagishi, R., Sciazko, A., Ouyang, Z., Komatsu, Y., Nishimura, K. and Shikazono, N.
  • Organizer: 17th International Symposium on Solid Oxide Fuel Cells (SOFC-XVII)
  • Int'l Joint Research
• [Presentation] In Operando Observations of SOFC Fuel Electrodes (2021)
  • Author(s): Shikazono, N., Jiao, Z., Ouyang, Z., Yamagishi, R., Suzuki, Y., Sciazko, A., Komatsu, Y., Nishimura, K., Onishi, J.
  • Organizer: 6th Asian SOFC Symposium and Exhibition
  • Int'l Joint Research / Invited