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

Pham, Hung Cuong; Taniguchi, Shunsuke; Inoue, Yuko; Chou, Jyh Tyng; Izumi, Toru; Matsuoka, Koji; Sasaki, Kazunari

doi:10.1016/j.jpowsour.2015.07.096

Cited by 6 publications

(20 citation statements)

References 34 publications

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“…We have already reported that a polycrystal of γ‐Al 2 O 3 containing a small amount of Sr 3 Al 2 O 6 grew as a columnar structure in the same direction when the alloy was coated with LSCF first and then heat treated at 700–800 °C . When the uncoated alloy was heat treated, crystalline γ‐Al 2 O 3 with a negligible Sr content grew in various directions, and a much lower electrical conductivity was exhibited.…”

Section: Resultssupporting

confidence: 88%

“…Porous alloy samples with the same chemical composition were fabricated using the procedure reported in Ref. . The porous alloy samples were used for microscopy because it was easier to pickup of the interface between the alloy and electrode by a focused ion beam (FIB).…”

Section: Methodssupporting

confidence: 65%

“…The elemental composition of the LSCF coating is almost identical to that in Ref. . In contrast, under condition 4, elements other than Al or O were negligible because of the lower detection limit of the analysis (<0.5 at.%).…”

Section: Resultsmentioning

confidence: 92%

“…This alloy may suppress Cr diffusion to the adjacent electrode, thus solving a critical issue of cells using conventional Fe‐Cr or Ni‐Cr alloys. Recently, we found that the electrical resistance of the surface oxide layer on porous Fe‐Cr‐Al can be decreased by coating the alloy with La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) followed by a heat treatment in air at 700–800 °C . Through this treatment, the surface oxide layer gains a columnar structure of polycrystalline γ‐Al 2 O 3 with small amounts of Sr 3 Al 2 O 6 crystal growing outward in the same direction.…”

Section: Introductionmentioning

confidence: 99%

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Modification of Surface Oxide Layer of Fe‐Cr‐Al Alloy with Coating Materials for SOFC Applications

et al. 2017

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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 γ‐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 γ‐Al2O3 with these elements.

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Section: Resultssupporting

confidence: 88%

Section: Methodssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Modification of Surface Oxide Layer of Fe‐Cr‐Al Alloy with Coating Materials for SOFC Applications

et al. 2017

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“…By now, little attention was paid to the electrical resistance of the porous electrode in MFC. Although studies can be found about the electrical resistance in other kinds of fuel cells such as proton exchange membrane fuel cells, [24][25][26] microbial fuel cells, 23,27 and solid oxide fuel cells, 28,29 the conclusions derived from these studies cannot be directly applied to MFC due to the different working mechanisms of the mass and charge transport in different fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells

Bei

Xü

et al. 2017

Int J Energy Res

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Summary Significant electrical resistance is observed in porous electrodes of microfluidic fuel cell due to the size limitation of this energy system. In this work, role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells is studied with a three‐dimensional numerical model. Parametric simulations are performed to find proper ways to reduce the electrical resistance, including increasing the electrical conductivity of the electrode, changing the electrode geometry, and optimizing the current collector design. The results indicate that the cell cannot fully get rid of the negative influences of the electrical resistance by increasing the electrical conductivity due to the material restriction. Decreasing the electrode length or increasing the electrode width is also not feasible due to the trade‐off between current and current density. Optimization of the aspect ratio of the electrode active region is proved effective in realizing the enhancement of both current and current density. Extending the current collector area from the exposed end to the active region of the porous electrode is also promising as it can decrease the electrical resistance and boost the cell performance simultaneously. The present findings are generally applicable to various miniaturized fuel cell types using porous electrodes.

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Investigation of Fe-Cr-Al Alloy for Metal Supported SOFC

et al. 2017

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Porous Fe-Cr-Al alloy was investigated for the support material of solid oxide fuel cells. Interfacial resistance at 700 o C in 3% H 2 O -97% H 2 atmosphere between the porous alloy and Ni coating was stable at around 10 mΩcm 2 . Interfacial resistance at 700 o C in air between the porous alloy and LSCF coating was stable at around 20 mΩcm 2 . The surface oxide layer on the Fe-Cr-Al alloy consists of nano-sized γ-Al 2 O 3 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.

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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

Cited by 6 publications

References 34 publications

Modification of Surface Oxide Layer of Fe‐Cr‐Al Alloy with Coating Materials for SOFC Applications

Modification of Surface Oxide Layer of Fe‐Cr‐Al Alloy with Coating Materials for SOFC Applications

Role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells

Investigation of Fe-Cr-Al Alloy for Metal Supported SOFC

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