Image analysis of the porous yttria-stabilized zirconia (YSZ) structure for a lanthanum ferrite-impregnated solid oxide fuel cell (SOFC) electrode

Ni, Chengsheng; Cassidy, Mark; Irvine, John T. S.

doi:10.1016/j.jeurceramsoc.2018.08.026

Cited by 17 publications

(8 citation statements)

References 47 publications

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“…71,72 In addition, solution infiltration can reduce the sintering temperature of the material by infiltrating the active material to avoid high-temperature coarsening of the grains. 73,74 Thus, it can effectively increase the length of the three-phase boundary (TPB) 75,76 and improve the number of active sites 77,78 as well as the pollution resistance. 79,80 However, although it is possible to regulate the amount of infiltration by controlling the loading rate, several infiltration cycles are still required.…”

Section: One-pot Methodmentioning

confidence: 99%

“…Among these surface modification methods, solution infiltration has a high degree of versatility due to the wide range of active materials allowed for infiltration . Solution infiltration can change the surface structure or composition of the material with low cost and easy operation. , In addition, solution infiltration can reduce the sintering temperature of the material by infiltrating the active material to avoid high-temperature coarsening of the grains. , Thus, it can effectively increase the length of the three-phase boundary (TPB) , and improve the number of active sites , as well as the pollution resistance. , However, although it is possible to regulate the amount of infiltration by controlling the loading rate, several infiltration cycles are still required. It is time-consuming and still more difficult to control the distribution and thickness of the infiltrated material.…”

Section: Surface Modification Methodsmentioning

confidence: 99%

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Review of SOFC Cathode Performance Enhancement by Surface Modifications: Recent Advances and Future Directions

et al. 2023

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Cathode materials with high electrochemical catalytic activity, stability, and durability at medium/low temperatures are still critical challenges for the commercialization of solid oxide fuel cells (SOFCs). Therefore, various surface modification techniques have been employed to improve the performance of SOFC cathodes. Significant achievements have been made in enhancing the cathode catalytic activity and durability by surface modification, including solution infiltration, the atomic layer deposition technique (ALD), and the one-pot method. Surface modification is considered to be one of the most effective approaches to enhance the catalytic activity and durability of the cathodes with the advantages of low cost and time savings. This review illustrates the fundamental principles, recent progress, advantages, disadvantages, challenges, and prospects of these advanced surface modification technologies. Furthermore, this article provides valuable guidance and potential directions for these surface modification methods toward the commercialization of SOFC technology.

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Section: One-pot Methodmentioning

confidence: 99%

Section: Surface Modification Methodsmentioning

confidence: 99%

Review of SOFC Cathode Performance Enhancement by Surface Modifications: Recent Advances and Future Directions

et al. 2023

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“…La x (Sr,Ca) 1-x FeO 3-δ perovskites with variable x = 0.5 to 0.9 compositions have been studied in numerous works reported in literature [2][3][4][6][7][8][9][10][11][12][13][14][15][16]. The studies investigated the electronic/ionic conductivity and/or thermal expansion of the materials, as well as their electrochemical performance under fuel cell and electrolysis operating conditions in the temperature range of 600-750°C.…”

Section: Co-and Ni-free Electrode Benchmarkingmentioning

confidence: 99%

Use Co- and Ni-Free Air Electrode in Solid Oxide Cell Manufacturing for Electrolysis and Fuel Cell Applications

et al. 2021

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Reduction of critical raw materials in the manufacturing of Solid Oxide Cell (SOC) is a key requirement to achieve low cost and large-scale commercialization of high-temperature electrolysis and fuel cell systems. A novel air electrode architecture based on Co- and Ni-free materials with the (La,Ca,Sr)FeO3-δ perovskite class of materials is currently under development at TNO within the European project NewSOC. The typically increased overpotential of Co- and Ni-free air electrodes is a challenge, which is aimed to be tackled by introduction of a patterned porous barrier layer and addition of a composite layer at the electrode/electrolyte interface in order to enhance the triple phase boundary density of the air electrode. A highlight of this ongoing research in presented in this paper.

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“…The slurry for the electrodes was prepared by mixing the powder (1:1 by weight) with a vehicle containing 5 wt.% polyvinylpyrrolidone and 95 wt.% terpineol (Macklin, mixed polymorphs, 99.9%). For the preparation of a full cell, the painted green films of the mixed GDC and LSCF (4:6 in weight ratio) cathode and TFN-36 anode on either side of the electrolyte was dried at 80 o C in air and then calcined at 1000 o C for alumina tube using a ceramic bond and electrochemical performance was tested using humidified H2 or liquefied petroleum gas (LPG, 5-6 vol.% H2, 10 vol.% CH4, 5 vol.% C2H6, 10 vol.% C3H6, 3 vol.% C2H4, 3 vol.% H2O, 10 vol.% C5-C6 alkane and balance C3H8 and C4H10; S impurity: 40 mg m -3 ) as fuel [42,43]. The flow rate of fuel was 25 mL min -1 and the cathode was exposed in static air.…”

Section: Materials Characterizationmentioning

confidence: 99%

An FeNbO4-based oxide anode for a solid oxide fuel cell (SOFC)

Liu

Xie

Irvine

et al. 2020

Electrochimica Acta

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The advantage of n-type semiconductor for an anode of solid oxide fuel cells (SOFCs) lies in its higher electronic conductivity in reducing atmosphere than in air. In this study, n-type FeNbO4-based oxides that can be reduced at temperatures below 700 o C for a conductivity above 1 S cm -1 are explored as anode materials for a ceria-based SOFC utilizing liquefied-petroleum-gas (LPG) fuel apart from pure H2. Fe0.8Nb1.2O4 with 20 at.% Fe deficiency was founded in the sample sintered at 1250 o C. The structure stability of FeNbO4 under reducing atmosphere can be improved by its solid solution with a lessreducible TiO2 that also stabilizes the high-temperature -PbO2 type structure with mixed Fe 3+ and Nb 5+ cation. In particular, a full cell employing Ti0.36(Fe0.985Nb1.015)0.84O4, a stable and electrically conductive (1 S cm -1 ) oxide in 5% H2, as anode shows a powder density of 180 mW cm -2 at 700 o C if 0.5 wt.% Pd is impregnated to increase the electrocatalysis and the electric loss is mostly from the electrolyte. The oxide anode showed a degradation (20% during the 5 to 26 hours aging) and the carbon deposition is slight after 5-hour operation under an LPG fuel.[1] and are not restrained by efficiency limitations applicable to heat engines (i.e. the Carnot cycle). The potential widespread use of SOFCs also depends on the availability of fuel[2]. Comparing to the low-temperature proton-exchange-membrane fuel cell (PEMFC), the advantage of an all-ceramic SOFC device could be the ability to use carbonaceous fuel, i.e. carbon monoxide, methane et al., other than pure H2 fuel[3-6]. The fuel versatility of an SOFC increases the fuel availability since the infrastructure for carbonaceous fuel is mature, which will facilitate the commercialization of this technique and reduce the additional cost on H2 storage and transport[2]. The conventional nickelbased anode catalyzing the oxidation of the H2 fuel on GDC electrolyte is Ni(O)-GDC cermet and a high performance (e.g. 2 W cm 2 at 550 o C)[7] has been achieved via the optimization of the cathode materials and the thinning of the electrolyte[8]. However, the carbon deposition or coking process of the Ni under a carbonaceous fuel would prohibit the long-term operation for continuous power supply[9] and thus novel oxide perovskites, such as (La, Sr)(Cr, Mn)O3, Sr2MoMO6 (M=Mg, Cr or Mn) and (La, Sr)TiO3, has been developed for the operation under hydrocarbon fuels[10-20].Generally, both nand p-type semiconducting oxides can be used as the anode materials in an SOFC. La0.75Sr0.25Cr0.5Mn0.5O3 is a paradigmatic p-type semiconducting oxide showing a decreased conductivity under reducing atmosphere of fuel than in air, while (La, Sr)TiO3 is an n-type semiconductor showing superior stability and conductivity if is fully reduced[21] at elevated temperatures [22] (above 750 o C under H2). However, an SOFC under the intense in-situ reduction at elevated temperature for anodes can possibly induce the reduction of the GDC electrolyte, causing the increase of electronic conduction and i...

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Image analysis of the porous yttria-stabilized zirconia (YSZ) structure for a lanthanum ferrite-impregnated solid oxide fuel cell (SOFC) electrode

Cited by 17 publications

References 47 publications

Review of SOFC Cathode Performance Enhancement by Surface Modifications: Recent Advances and Future Directions

Review of SOFC Cathode Performance Enhancement by Surface Modifications: Recent Advances and Future Directions

Use Co- and Ni-Free Air Electrode in Solid Oxide Cell Manufacturing for Electrolysis and Fuel Cell Applications

An FeNbO4-based oxide anode for a solid oxide fuel cell (SOFC)

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