A-deficit LSCF for intermediate temperature solid oxide fuel cells

Fan, Baoan; Xiang-li, Liu

doi:10.1016/j.ssi.2009.03.017

Cited by 34 publications

(16 citation statements)

References 7 publications

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“…The typical cation precursors for these perovskites are nitrates (Magnone et al 2007), occasionally prepared by dissolving the parent oxide in HNO3 (da Conceição et al 2009), although sometimes carbonates are used for the more basic cations (Fan and Liu 2009). Gupta and Whang also did a series of experiments where they changed between nitrates and acetates as precursors for the preparation of La0.9Sr0.1Cr0.85Fe0.05Co0.05Ni0.05O3−δ (Gupta and Whang 2007).…”

Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

“…They observed that using acetates gave less secondary phases, and discussed this in relation to the pH in the solution and its influence on the chelating ability of CA. Several complexing agents have been used, but the most typical is CA, both with (Gaudon et al 2002) and without (Fan and Liu 2009) addition of EG as a polymerization agent. The ratio between CA and metal cations has been demonstrated to be an important parameter.…”

Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

“…For ratios less than three, precipitations of unidentified phases was observed, both for LSM (Da Conceição et al 2011) and LSCF (Nityanand et al 2011). On the other hand, by adding ammonia to adjust the pH to 8, Fan et al prepared phase-pure LSCF with a CA:cation ratio of only 1.5 (Fan and Liu 2009). Strontium carbonate has been observed as a secondary phase for calcination at temperatures of 500-600 °C due to the high stability of SrCO3, but phase-pure materials are obtained by increasing the calcination temperatures (Shao et al 2009).…”

Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

“…Phase-pure LSCF has been prepared by the amorphous citrate synthesis, without the use of EG (Magnone et al 2007;Fan and Liu 2009). On the other hand, Kakihana et al demonstrated that the polymerization was crucial in order to avoid secondary phases during the synthesis of lanthanum manganite ).…”

Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

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Modified Pechini Synthesis of Oxide Powders and Thin Films

Sunde

Grande

Einarsrud

2016

Handbook of Sol-Gel Science and Technology

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The modified Pechini method has become one of the most popular synthesis methods for complex oxide materials due to its simplicity and versatility. The method can be applied to synthesize nano-crystalline powders, bulk materials as well as oxide thin films. Here, we present a comprehensive review of the method with focus on the chemistry through the three stages of the process; preparation of stable aqueous solution, poly-esterification to form a solid polymeric resin and finally decomposition/combustion of the resin to form an amorphous oxide followed by crystallization of the desired oxide phase. The review include

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Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

Section: Lanthanum Transition Metal Perovskite Oxides For Energy Techmentioning

confidence: 99%

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Modified Pechini Synthesis of Oxide Powders and Thin Films

Sunde

Grande

Einarsrud

2016

Handbook of Sol-Gel Science and Technology

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“…[8][9][10] Many experimental studies have illuminated the structural properties, oxygen transport kinetics, and electrochemical performance of LSCF, BSCF, and SFMO. [6,[10][11][12][13] Far less is known about SFKO. Hou et al reported that cathodes of Sr 0.9 K 0.1 FeO 3 (with a La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3−δ , or LSGM, electrolyte and a Sr 2 MgMoO 6 anode) produced a current density competitive with LSCF at 800°C.…”

mentioning

confidence: 99%

Density functional theory investigation of the electronic structure and defect chemistry of Sr1-xKxFeO3

2016

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Solid oxide fuel cells (SOFCs) efficiently generate electricity, but high operating temperatures (T op > 800°C) limit their utility. Reducing T op requires mixed ion-electron conducting (MIEC) cathode materials. Density functional theory is used here to investigate the role of potassium substitutions in the MIEC material Sr 1−x K x FeO 3 (SKFO). We predict that such substitutions are endothermic. SrFeO 3 and SKFO have nearly identical metallic electronic structures. Oxygen vacancy formation energies decrease by ∼0.2 eV when x K increases from 0 to 0.0625. SKFO is a promising SOFC MIEC cathode material; however, further experimental investigations must assess its long-term stability at the desired operating temperatures.Solid oxide fuel cells (SOFCs) provide a clean and efficient means of generating electrical power from various fuel sources.[1] However, high operating temperatures (T op > 800°C) reduce the overpotential arising from standard La 1−x Sr x MnO 3 cathodes, but increase material costs and shorten cell lifetimes.[2]Intermediate-temperature (600°C < T op < 800°C) SOFCs have potential to overcome these deficiencies but in turn require alternative, mixed ion-electron conducting (MIEC) cathode materials to increase the active region and reduce the cathode overpotential.[3] Useful MIEC cathode materials must allow for facile electronic and ionic conductivity.La 1−x Sr x Co 1−y Fe y O 3 remains the reference MIEC cathode [4][5][6][7] although many other cathode materials show promising electrochemical behavior. These include Ba 1−x Sr x Co 1−y Fe y O 3 (BSCF), Sr 2 Fe 2−x Mo x O 6 (SFMO), and Sr 1−x K x FeO 3 (SKFO). [8][9][10] Many experimental studies have illuminated the structural properties, oxygen transport kinetics, and electrochemical performance of LSCF, BSCF, and SFMO. [6,[10][11][12][13] Far less is known about SFKO. Hou et al. reported that cathodes of Sr 0.9 K 0.1 FeO 3 (with a La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3−δ , or LSGM, electrolyte and a Sr 2 MgMoO 6 anode) produced a current density competitive with LSCF at 800°C. [9] Repetitive cycling of the cell between open circuit voltage and 0.4 V caused no loss in the observed power density.[9] Furthermore, SFKO cathodes contain no Co, which improves their cost-effectiveness. [14] Additional studies support the use of Sr 0.9 K 0.1 FeO 3 as a SOFC cathode material by offering additional evidence of its stability [15] and demonstrating a viable synthesis method for the material. [16] The small body of experimental evidence supporting SKFO as an MIEC cathode in SOFC applications suggests that further investigation into this material is warranted. [9,15,16] Firstprinciples quantum mechanics methods based on KohnSham density functional theory (KS-DFT) have proven useful in providing rational design principles for related materials. [17][18][19][20][21][22][23][24][25][26] Here we provide a DFT study of SKFO (x K = 0, 0.0625, and 0.125) aimed at answering three questions. First, does potassium substitution (K / Sr in Kröger-Vink notation [27] ) ne...

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Fuel Cells and Materials

Lu¹

2014

Materials in Energy Conversion, Harvesting, and Storage

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A-deficit LSCF for intermediate temperature solid oxide fuel cells

Cited by 34 publications

References 7 publications

Modified Pechini Synthesis of Oxide Powders and Thin Films

Modified Pechini Synthesis of Oxide Powders and Thin Films

Density functional theory investigation of the electronic structure and defect chemistry of Sr1-xKxFeO3

Fuel Cells and Materials

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