Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

Jeong, Donghwi; Kim, Junyoung; Kwon, Oh Hun; Lim, Chaehyun; Sengodan, Sivaprakash; Shin, Jeeyoung; Kim, Guntae

doi:10.3390/app8112217

Cited by 26 publications

(5 citation statements)

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“…From a practical point of view, reliable thermodynamic data on tris-β-(diketonato)scandium complexes are important for the MOCVD of Sc-containing films, which are in demand in various fields. In particular, it is well known that coatings containing scandium oxide are widely used in optics due to their wide bandwidth and high melting point [11,[25][26][27] and are promising materials for microelectronics [28,29], SOFC [30] etc. In this work, we collected data on vapor pressures, sublimation, vaporization and fusion enthalpies available in the literature and evaluated them using our own complementary measurements.…”

Section: Calculated the Enthalpies Of Vaporization Of Organometallicmentioning

confidence: 99%

Metal-Organic Chemical Vapor Deposition Precursors: Diagnostic Check for Volatilization Thermodynamics of Scandium(III) β-Diketonates

2023

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Scandium complexes with β-diketonate ligands are valuable precursors for the metal–organic chemical vapor deposition (MOCVD) of scandia based materials, but data on their volatilization thermodynamics crucial to MOCVD technology are in a huge disarray. We have addressed this issue with a diagnostic tool based on the principles of group additivity and structure–property relationships, which had been developed by us specifically for metal–organic objects. For this purpose, a mass of experimental data on the vapor pressures and enthalpies of sublimation, vaporization and fusion available in the literature for scandium(III) β-diketonates has been compiled and analyzed. Additionally, saturated vapor pressures and thermodynamic sublimation characteristics have been obtained for scandium(III) complexes with acetylacetone, hexafluoroacetylacetone, and 3-methyl-2,4-pentanedione by transpiration and thermogravimetric methods. New data have allowed us to arbitrate the conflict of literature data. As a result, a consistent set of enthalpies of the three discussed processes has been obtained for eight scandium complexes. Dispersion interactions and non-additive effects have been shown to be typical for metal tris-β-diketonates. They have been taken into account to improve the diagnostic check. It is now possible to quite easily assess the thermodynamics of tris-β-diketonate complexes with different metals which are in demand as precursors in gas-phase technology.

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Section: Calculated the Enthalpies Of Vaporization Of Organometallicmentioning

confidence: 99%

Metal-Organic Chemical Vapor Deposition Precursors: Diagnostic Check for Volatilization Thermodynamics of Scandium(III) β-Diketonates

2023

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“…This is due to the liberation of lattice oxygen upon heating and the spin-state changes of Co 3+ ions [156,157]. To address these drawbacks, researchers have examined the substitution of cobalt with various elements, including Fe [100][101][102][158][159][160][161][162][163], Ni [103,104,[164][165][166], Cu [105][106][107], Mn [167,168], Zn [169], Zr [170,171], W [172], Sc [173], Mo [174], Ga [175], and Bi Similar to other cobalt-based cathode materials, LnBaCo 2 O 5+δ often displays relatively high TECs, typically ranging from 19 to 25 × 10 −6 K −1 at 80-900 • C. These values are substantially higher than those of conventional electrolytes (10-13 × 10 −6 K −1 ) [154] and sealing materials (11-14 × 10 −6 K −1 ) [155]. Such differences can lead to significant compatibility issues between the double perovskites and other components of SOFCs during cell fabrication and thermal cycling, potentially causing performance degradation.…”

Section: Compositional Optimization Of Lnbaco 2 O 5+δmentioning

confidence: 99%

“…This is due to the liberation of lattice oxygen upon heating and the spin-state changes of Co 3+ ions [156,157]. To address these drawbacks, researchers have examined the substitution of cobalt with various elements, including Fe [100][101][102][158][159][160][161][162][163], Ni [103,104,[164][165][166], Cu [105][106][107], Mn [167,168], Zn [169], Zr [170,171], W [172], Sc [173], Mo [174], Ga [175], and Bi [176]. Jo et al [104] reported that partial substitution of Fe and Cu for Co in GdBaCo 2 O 5+δ (GdBaCo 2/3 Fe 2/3 Cu 2/3 O 5+δ ) can reduce the TECs from 19.9 × 10 −6 K −1 to 14.6 × 10 −6 K −1 at 80-900 • C. Zhao et al [100] conducted a comprehensive investigation into the impact of Fe content on the physicochemical properties of double perovskite PrBaCo 2 O 5+δ , discovering a continuous decrease in TECs with higher Fe content.…”

Section: Compositional Optimization Of Lnbaco 2 O 5+δmentioning

confidence: 99%

Progress in Developing LnBaCo2O5+δ as an Oxygen Reduction Catalyst for Solid Oxide Fuel Cells

Zheng,

Pang

2023

Catalysts

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Solid oxide fuel cells (SOFCs) represent a breed of eco-friendly, weather-independent, decentralized power generation technologies, distinguished for their broad fuel versatility and superior electricity generation efficiency. At present, SOFCs are impeded by a lack of highly efficient oxygen reduction catalysts, a factor that significantly constrains their performance. The double perovskites LnBaCo2O5+δ (Ln = Lanthanide), renowned for their accelerated oxygen exchange and conductivity features, are widely acclaimed as a promising category of cathode catalysts for SOFCs. This manuscript offers a novel perspective on the physicochemical attributes of LnBaCo2O5+δ accumulated over the past two decades and delineates the latest advancements in fine-tuning the composition and nanostructure for SOFC applications. It highlights surface chemistry under operational conditions and microstructure as emerging research focal points towards achieving high-performance LnBaCo2O5+δ catalysts. This review offers a comprehensive insight into the latest advancements in utilizing LnBaCo2O5+δ in the field of SOFCs, presenting a clear roadmap for future developmental trajectories. Furthermore, it provides valuable insights for the application of double perovskite materials in domains such as water electrolysis, CO2 electrolysis, chemical sensors, and metal–air batteries.

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“…According to Jeong et al [ 12 ], the Sc(III) doping into the layered perovskite material PrBaCo 2 O 5+ α (PBCO) has a significant impact on the electrochemical performance. They found that Sc(III) doping improved the Goldschmidt tolerance factor and specific free volume of the layered perovskites, resulting in a more suitable crystalline structure for oxygen ion transport in the lattice.…”

Section: Introductionmentioning

confidence: 99%

Scandium Recovery Methods from Mining, Metallurgical Extractive Industries, and Industrial Wastes

et al. 2022

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The recovery of scandium (Sc) from wastes and various resources using solvent extraction (SX) was discussed in detail. Moreover, the metallurgical extractive procedures for Sc recovery were presented. Acidic and neutral organophosphorus (OPCs) extractants are the most extensively used in industrial activities, considering that they provide the highest extraction efficiency of any of the valuable components. Due to the chemical and physical similarities of the rare earth metals, the separation and purification processes of Sc are difficult tasks. Sc has also been extracted from acidic solutions using carboxylic acids, amines, and acidic β-diketone, among other solvents and chemicals. For improving the extraction efficiencies, the development of mixed extractants or synergistic systems for the SX of Sc has been carried out in recent years. Different operational parameters play an important role in the extraction process, such as the type of the aqueous phase and its acidity, the aqueous (A) to organic (O) and solid (S) to liquid (L) phase ratios, as well as the type of the diluents. Sc recovery is now implemented in industrial production using a combination of hydrometallurgical and pyrometallurgical techniques, such as ore pre-treatment, leaching, SX, precipitation, and calcination. The hydrometallurgical methods (acid leaching and SX) were effective for Sc recovery. Furthermore, the OPCs bis(2-ethylhexyl) phosphoric acid (D2EHPA/P204) and tributyl phosphate (TBP) showed interesting potential taking into consideration some co-extracted metals such as Fe(III) and Ti(IV).

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Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

Cited by 26 publications

References 50 publications

Metal-Organic Chemical Vapor Deposition Precursors: Diagnostic Check for Volatilization Thermodynamics of Scandium(III) β-Diketonates

Metal-Organic Chemical Vapor Deposition Precursors: Diagnostic Check for Volatilization Thermodynamics of Scandium(III) β-Diketonates

Progress in Developing LnBaCo2O5+δ as an Oxygen Reduction Catalyst for Solid Oxide Fuel Cells

Scandium Recovery Methods from Mining, Metallurgical Extractive Industries, and Industrial Wastes

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