||Tatsuya Kawasaki, Junko Matsuda, Yuya Tachikawa, Stephen Matthew Lyth, Yusuke Shiratori, Shunsuke Taniguchi, Kazunari Sasaki, Oxidation-induced degradation and performance fluctuation of solid oxide fuel cell
Ni anodes under simulated high fuel utilization conditions, International Journal of Hydrogen Energy
Volume 44, Issue 18, 5 April 2019, Pages 9386-9399, https://doi.org/10.1016/j.ijhydene.2019.02.136, 2019.04.
||J.-T. CHOU, Y. INOUE, T. KAWABATA, J. MATSUDA, S. TANIGUCHI, K. SASAKI, Mechanism of SrZrO3 formation at GDC/YSZ Interface of SOFC Cathode, J. Electrochem. Soc., 165(11) pp.F959-965 (2018), doi:10.1149/2.0551811jes, 2018.11.
||H. C. Pham, Shunsuke Taniguchi, Y. Inoue, J. T. Chou, Junko Matsuda, Kazunari Sasaki, Investigation of Fe-Cr-Al alloy for metal supported SOFC, 15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
ECS Transactions, 10.1149/07801.2069ecst, 78, 2069-2075, 2017.05, Porous Fe-Cr-Al alloy was investigated for the support material of solid oxide fuel cells. Interfacial resistance at 700oC in 3% H2O - 97% H2 atmosphere between the porous alloy and Ni coating was stable at around 10 mγcm2. Interfacial resistance at 700oC in air between the porous alloy and LSCF coating was stable at around 20 mγcm2. The surface oxide layer on the Fe-Cr-Al alloy consists of nano-sized γ-Al2O3 columns growing outward in the same direction, containing 4 at.% of Sr, which may contribute electronic conduction. It is expected that the negligible Cr content in the surface oxide layer can solve the Cr contamination problem, generally known in SOFC. We are also developing a cell using the porous Fe-Cr-Al alloy by a co-sintering process..
||H. C. Pham, Shunsuke Taniguchi, Y. Inoue, Junko Matsuda, J. T. Chou, K. Matsuoka, Kazunari Sasaki, Durability of LSCF-coated Fe-Cr-Al alloy for SOFC applications, Journal of the Electrochemical Society, 10.1149/2.0791803jes, 165, 3, F181-F188, 2018.01, The long-term durability of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-coated Fe-Cr-Al alloy was investigated as a novel current collector material for SOFCs. The LSCF coating and subsequent heat-treatment at 700–900◦C changed the microstructure of the surface oxide layer to a columnar structure of nanosize γ-Al2O3 arranged in the same direction, in which a small amount of Sr3Al2O6 contributes to the electronic conduction. The LSCF coating decreased the alloy oxidation rate by 23% at 700◦C compared to the case without coating, following the parabolic growth law. Raising the temperature from 700◦C to 900◦C increased the oxidation rate of the LSCF-coated alloy by 51 times. The oxidation mechanism at 900◦C was considered to be similar to that at 700◦C, because of the similarity in microstructure, crystal structure, elemental composition and electrical conductivity. It was estimated that the Cr2O3 layer begins to grow on the inner side after roughly 6,000 h at 700◦C, when the thickness of the surface oxide layer exceeds 1 μm. The same γ-Al2O3 columnar microstructure still covered the surface after 12,000 h. However, further improvement in durability and electrical conductivity is needed to meet the requirements for practical application..
||PHAM HUNG CUONG, Shunsuke Taniguchi, Yuko Inoue, Junko Matsuda, J.-T. Chou, Y. Misu, K. Matsuoka, Kazunari SASAKI, Modification of Surface Oxide Layer of Fe-Cr-Al Alloy with Coating Materials for SOFC Applications, Fuel Cells, DOI: 10.1002/fuce.201600038, 17, 1, 83-89, 2017.01, We investigated the treatment of Fe-Cr-Al alloy for application in solid oxide fuel cells (SOFCs). The electrical resistance of the Al2O3-based surface oxide layer on the alloy decreased and was stable when La0.6Sr0.4Co0.2Fe0.8O3 (LSCF), La0.8Sr0.2MnO3 (LSM), LaNi0.6Fe0.4O3 (LNF), or Pr0.8Sr0.2MnO3 (PrSM) were first coated on the alloy and heat treated at 700 C in air. The activation energy, calculated from the resistance, also suggested that the surface oxide became more conductive with treatment. The surface oxide layer after treatment had a microstructure of columns growing outward in the same direction, containing small amounts of elements such as Sr, Ni, Fe, La, Mn, and Pr. The microstructure consists of polycrystalline g-Al2O3 and small amounts of Al
compounds with these elements. In the case of the LNF coating, the formation of NiAl2O4 was observed. The enhanced electrical conductivity may have resulted from the arrangement of the columnar structure, along with the electronic conduction path generated by the reaction of g-Al2O3 with these elements..
||Daiki Ishibashi, Shunsuke Taniguchi, Yuko Inoue, Jyh-Tyng Chou, Kazunari SASAKI, Deposition, agglomeration and vaporization of chromium oxide by cathode polarization change in SOFC cathodes, J. Electrochemical Society, DOI: 10.1149/2.0141607jes, 2016.07.
||Pham Hung Cuong, Shunsuke Taniguchi, Yuko Inoue, Jyh-Tyng Chou, Toru Izumi, Koji Matsuoka, Kazunari SASAKI, Decrease in electrical resistance of surface oxide of iron–chromium–aluminium alloy by La0.6Sr0.4Co0.2Fe0.8O3 coating and heat treatment for the application of metal-supported solid oxide fuel cells, J. Power Sources, http://dx.doi.org/10.1016/j.jpowsour.2015.07.096 , 2015.11.
||Eunjoo Park, Shunsuke Taniguchi, Takeshi Daio, Jyh-Tyng Chou, Kazunari Sasaki, Comparison of chromium poisoning among solid oxide fuel cell cathode materials, Solid State Ionics, 262, 421-427, Solid State Ionics, 262, pp. 421–427 (2014), 2014.09.
||Eunjoo Park, Shunsuke Taniguchi, Takeshi Daio, Jyh-Tyng Chou, Kazunari Sasaki, Influence of cathode polarization on the chromium deposition near the cathode/electrolyte interface of SOFC, Intl. J. Hydrogen Energy, 39, 3, 1463-1475, Intl. J. Hydrogen Energy, 39 (3), pp.1463-1475 (2014), 2014.01.