Correlation between oxygen vacancy and mechanical properties in oxideunder chemical potential

2009 Fiscal Year Final Research Report

• Project/Area Number: 20760061
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Materials/Mechanics of materials
• Research Institution: Tohoku University
• Principal Investigator: SATO Kazuhisa Tohoku University, 多元物質科学研究所, 助教 (50422077)
• Project Period (FY): 2008 – 2009
• Keywords: 固体酸化物形燃料電池 / 機能性酸化物 / 酸素不定比性 / 機械的特性 / 電気化学的特性

Research Abstract

For the commercialization of solid oxide fuel cell (SOFC), in addition to the electrical reliability, it is also important to ensure the mechanical reliability of SOFC. Thus, the establishment of a suitable mechanical testing method under various temperatures and oxygen partial pressure conditions is a prerequisite for the development of reliable SOFCs. This paper presents the experimental results of the investigation of elastic modulus and fracture strength on the SOFC components under reducing conditions. An in-situ mechanical testing method was developed in order to investigate the elastic modulus and fracture strength of solid oxide fuel cells components under high oxidizing/reducing environments. The elastic modulus was shown to change under reducing condition, and the behavior was most likely due to non-stoichiometry. It was demonstrated that the in-situ mechanical testing method enabled us to estimate the internal stress in the SOFC cell and stack.

Research Products

• [Journal Article] Effect of Y2O3 addition on the conductivity and elastic modulus of (CeO2)1-x(YO1. 5)x (2009)
  • Author(s): Kazuhisa Sato, Ken Suzuki, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Alan Atkinson, Junichiro Mizusaki
  • Journal Title: Solid State Ionics 180 Pages: 1220-1225
  • Peer Reviewed
• [Journal Article] Design Concept for the High Temperature Photoelectronic Devices Using SrTiO3 (2009)
  • Author(s): Fumimasa Horikiri, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki
  • Journal Title: Journal of the Electrochemical Society 156(7) Pages: 107-113
  • Peer Reviewed
• [Journal Article] Thermodynamic quantities and defect equilibrium in La2-xSrxNiO4+δ (2009)
  • Author(s): Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki
  • Journal Title: Journal of Solid State Chemistry 182 Pages: 1121-1128
  • Peer Reviewed
• [Journal Article] Defect structure analysis of B-site doped perovskite-type proton conducting oxide BaCeO3 Part1:The defect concentration of BaCe0. 9M0. 1O3-δ(M=Y and Yb) (2009)
  • Author(s): Masatsugu Oishi, Satoshi Akoshima, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada
  • Journal Title: Solid State Ionics 180 Pages: 127-131
  • Peer Reviewed
• [Journal Article] Oxygen nonstoichiometry of the perovskite-type oxides BaCe0. 9M0. 1O3-δ(M:Y, Yb, Sm, Tb, and Nd) (2008)
  • Author(s): Masatsugu Oishi, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Naoto Kitamura, Koji Amezawa, Tatsuya Kawada, Yoshiharu Uchimoto
  • Journal Title: Solid State Ionics 179 Pages: 529-535
  • Peer Reviewed
• [Journal Article] Defect structure analysis of B-site doped perocskite-type proton conducting oxide BaCeO3 (2008)
  • Author(s): Masatsugu Oishi, Satoshi Akoshima, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada
  • Journal Title: Solid State Ionics 179 Pages: 2240-2247
  • Peer Reviewed
• [Presentation] SOFCの信頼性・耐久性向上に向けた機械的解析 (2009)
  • Author(s): 佐藤一永
  • Organizer: 第77回sofc研究会
  • Place of Presentation: 東京
  • Year and Date: 2009-11-12
• [Presentation] AE法と電気化学的手法を併用した固体酸化物燃料電池の劣化挙動評価 (2009)
  • Author(s): 佐藤一永, 熊田圭吾, 橋田俊之, 水崎純一郎
  • Organizer: 日本機械学会2009年度年次大会
  • Place of Presentation: 日本, 盛岡
  • Year and Date: 2009-09-16
• [Presentation] Chemically-induced stress of fuel cell laminate under oxidizing/reducing gradient condition (2009)
  • Author(s): Kazuhisa Sato, Keiji Yashiro, Toshiyuki Hashida, Junichiro Mizusaki
  • Organizer: 17th International Conference on Composite Materials
  • Place of Presentation: Edinburgh, UK
  • Year and Date: 2009-06-29
• [Presentation] Thermal and chemically induced stress of solid oxide fuel cell laminate under oxidizing / reducing gradient condition (2009)
  • Author(s): Kazuhisa Sato, Keiji Yashiro, Toshiyuki Hashida, Junichiro Mizusaki
  • Organizer: 8th International Congress on THERMAL STRESSES
  • Place of Presentation: Illinois, USA
  • Year and Date: 2009-06-03
• [Presentation] SOFCの信頼性評価のための機械的解析(Mechanical analysis for reliability evaluation of SOFC) (2008)
  • Author(s): 佐藤一永, 八代圭司, 井口史匡, 古山通久, 雨澤浩史, 寺田賢二郎, 湯上浩雄, 橋田俊之, 水崎純一郎, 川田達也
  • Organizer: 第17回SOFC研究発表会
  • Place of Presentation: 日本, 東京
  • Year and Date: 2008-12-19
• [Presentation] Evaluation Method for Mechanical Performance of Solid Oxide Fuel Cell under Simulated Operating Conditions (2008)
  • Author(s): Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki
  • Organizer: ASME 6th International Fuel Cell Science, Engineering & Technology Conference
  • Place of Presentation: USA, Denver
  • Year and Date: 2008-06-17
• [Remarks]
  • URL: http://www.tagen.tohoku.ac.jp/labo/mizusaki/index-j.html
• [Patent(Industrial Property Rights)] 複合金属酸化物およびその製造法、並びにそれを用いた電極材料、電極および固体酸化物形燃料電池 (2009)
  • Inventor(s): 水崎純一郎、佐藤一永、八代圭司
  • Industrial Property Rights Holder: 水崎純一郎、佐藤一永、八代圭司
  • Industrial Property Number: 特許特願2009-199934
  • Filing Date: 2009-08-31