Effect of samarium (Sm3+) doping on structure and electrical conductivity of double perovskite Sr2NiMoO6 as anode material for SOFC

Kumar, Pravin; Presto, Sabrina; Sinha, Asha; Varma, Salil; Viviani, Massimo; Singh, Prabhakar

doi:10.1016/j.jallcom.2017.07.211

Cited by 43 publications

(25 citation statements)

References 42 publications

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“…Similarly, the performance of perovskite also depends on its microstructure [36]. Especially the structural changes caused by element doping will lead to corresponding changes in the electrical properties of double perovskite [13,37]. XRD testing were used to study the phase formation and crystallinity of SFMN, after calcining at 900°C for 24 h both in air and under H 2 /H 2 O(g) atmosphere.…”

Section: Xrd Analysis Of Sfmn Crystal Structure Changementioning

confidence: 99%

“…After dopping Mn, Huang found that Sr 2 Mg 1−x Mn x MoO 6−delta meet the requirements for long-term stability with tolerance to sulfur and show a superior single-cell performance in hydrogen and methane [11]. Subsequently, studies on applications of double-perovskites in SOFC became a hot spot [12][13][14][15]. Some other double-perovskite electrode materials also show good cell performances, such as Ba 2 CoMo 0.5 Nb 0.5 O 6−delta [16], Sr 2 FeMoO 6 [17,18], YBaCo 2−x Fe x O 5+delta [19], SmBaCuCoO 5+delta [20], etc [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Effects of the atmosphere and Mn doping on the electrical properties of Sr₂Fe_1−xMn_xNbO₆ and their mechanisms

Sheng

Zhuang

et al. 2020

Mater. Res. Express

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Double-perovskite composite oxides (A 2 BB′O 6 ) usually have excellent functional properties and are widely studied and applied. Its electrical, magnetic or other properties can be optimized by doping transition metal elements at its B or B′ site. In this paper, the effects of Mn doping and testing atmosphere on the crystal structures and the electrical conductivities of Sr 2 Fe 1−x Mn x NbO 6 (SFMN) were systematically investigated. The experimental results demonstrate that the conductivities of SFMN will increase in air while decrease under H 2 /H 2 O(g) atmosphere with Mn content rise. Doping Mn can enlarge the interplanar spacing of SFMN which increases the resistance of electron conduction across the crystal. First-principles calculations and XPS analysis results reveal that the chemical adsorption of H 2 on the surface of SFMN is a key reason for its conductivity increase under H 2 /H 2 O(g) atmosphere. The forbidden band width of the reduced state of Sr 2 FeNbO 6 (1.177 eV) is much smaller than that of the oxidation state (1.426 eV). The analysis results suggest that Fe 3d electron transition and exchange interaction between Mn-O-Mn are mainly two possible mechanisms contribute to the electrical conductivity of SFMN.

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Section: Xrd Analysis Of Sfmn Crystal Structure Changementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the atmosphere and Mn doping on the electrical properties of Sr₂Fe_1−xMn_xNbO₆ and their mechanisms

Sheng

Zhuang

et al. 2020

Mater. Res. Express

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“…For this purpose, the first step is to improve the anode of SOFC which is not only catalytically active for breaking the C―H bond with subsequent release of syngas, but also be electron conductive. In recent years, oxygen‐deficient and mixed‐valent perovskite materials have been shown to have a potential application as SOFC anode materials because of their appropriate catalytic activity and electro‐conductivity. For example, molybdenum‐based double perovskites Sr 2 MMoO 6‐δ (M = Co, Ni, Fe, Mn, and Mg) have exhibited excellent catalytic activity towards the electro‐oxidation of H 2 and CH 4 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced coking resistance of Ni cermet anodes for solid oxide fuel cells based on methane on‐cell reforming by a redox‐stable double‐perovskite Sr ₂ MoFeO _6‐δ

et al. 2018

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Summary Carbon deposition on a Ni‐based anode is troublesome for the direct power generation from methane‐based fuels using solid oxide fuel cell. In this paper, a redox‐stable double‐perovskite Sr2MoFeO6‐δ (SMFO) is applied as an independent on‐cell reforming catalyst over a Ni‐YSZ anode to improve coking resistance. The morphology, catalytic activity and electrochemical performance for wet methane/coal‐bed gas (CBG) are investigated. A Ni‐YSZ anode supported cell with SMFO generates a high power output of 1.77 W·cm−2 and exhibits favorable stability operated on wet CH4 at 800°C. Post‐mortem micro‐structural analyses of cells indicate the cell operated on CBG shows coking probably due to the heavy carbon compounds in CBG.

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“…The peaks in these spectra are broad and asymmetric in nature for all the compositions. Therefore, the peak for all the samples can be split into two peaks, owing to two different types of oxygen species, i.e., adsorbed and lattice oxygen [40]. The amount of lattice oxygen is reported in Table 2, corresponding for each sample to the ratio between the area of the sub-peak centred at 529.7 eV and the total area of the O 1s peak.…”

Section: Xps Analysismentioning

confidence: 99%

Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties

et al. 2019

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Perovskite anodes, nowadays, are used in any solid oxide fuel cell (SOFC) instead of conventional nickel/yttria-stabilized zirconia (Ni/YSZ) anodes due to their better redox and electrochemical stability. A few compositions of samarium-substituted strontium titanate perovskite, Sm x Sr 1−x TiO 3−δ (x = 0.00, 0.05, 0.10, 0.15, and 0.20), were synthesized via the citrate-nitrate auto-combustion route. The XRD patterns of these compositions confirm that the solid solubility limit of Sm in SrTiO 3 is x < 0.15. The X-ray Rietveld refinement for all samples indicated the perovskite cubic structure with a Pm3m space group at room temperature. The EDX mapping of the field emission scanning electron microscope (FESEM) micrographs of all compositions depicted a lower oxygen content in the specimens respect to the nominal value. This lower oxygen content in the samples were also confirmed via XPS study. The grain sizes of Sm x Sr 1−x TiO 3 samples were found to increase up to x = 0.10 and it decreases for the composition with x > 0.10. The AC conductivity spectra were fitted by Jonscher's power law in the temperature range of 500-700 • C and scaled with the help of the Ghosh and Summerfield scaling model taking ν H and σ dc T as the scaling parameters. The scaling behaviour of the samples showed that the conduction mechanism depends on temperature at higher frequencies. Further, a study of the conduction mechanism unveiled that small polaron hopping occurred with the formation of electrons. The electrical conductivity, in the H 2 atmosphere, of the Sm 0.10 Sr 0.90 TiO 3 sample was found to be 2.7 × 10 −1 S·cm −1 at 650 • C, which is the highest among the other compositions. Hence, the composition Sm 0.10 Sr 0.90 TiO 3 can be considered as a promising material for the application as the anode in SOFCs.Energies 2019, 12, 4042 2 of 16 SOEC technology [1][2][3][4][5][6][7][8]. SOFCs are more efficient in comparison to a conventional power plant and lower temperature polymer-based fuel cells [9,10]. Electrolyte and electrodes are the essential component of a solid oxide fuel cell. Even if anionic, protonic [11,12] and dual-membrane cells [13] are reported, the first are the most studied in the literature. The state of the art material for the electrolyte is fluorite-structured yttria-stabilized zirconia (YSZ) because of its wide range of stability in oxidizing and reducing media [14], although doped ceria [15] and perovskite Sr-and Mg-incorporated lanthanum gallate (LSGM) are considered as alternatives for intermediate operative temperatures. Lanthanum strontium manganite (LSM)-YSZ composite and Sr-and Fe-doped lanthanum cobaltite (LSCF) are extensively used for cathodes, while Ni-based cermets are conventionally used as anode materials for SOFCs [16,17], although this Ni-based cermet anode material should demonstrate volume instability upon redox cycling and low-tolerance to carbon deposition when exposed to hydrogen [18]. Therefore, nickel-free, alternate-structured anode materials are essential to overcome these issues. Recen...

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Effect of samarium (Sm3+) doping on structure and electrical conductivity of double perovskite Sr2NiMoO6 as anode material for SOFC

Cited by 43 publications

References 42 publications

Effects of the atmosphere and Mn doping on the electrical properties of Sr₂Fe_1−xMn_xNbO₆ and their mechanisms

Effects of the atmosphere and Mn doping on the electrical properties of Sr₂Fe_1−xMn_xNbO₆ and their mechanisms

Enhanced coking resistance of Ni cermet anodes for solid oxide fuel cells based on methane on‐cell reforming by a redox‐stable double‐perovskite Sr ₂ MoFeO _6‐δ

Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties

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Effect of samarium (Sm3+) doping on structure and electrical conductivity of double perovskite Sr2NiMoO6 as anode material for SOFC

Cited by 43 publications

References 42 publications

Effects of the atmosphere and Mn doping on the electrical properties of Sr2Fe1−xMnxNbO6 and their mechanisms

Effects of the atmosphere and Mn doping on the electrical properties of Sr2Fe1−xMnxNbO6 and their mechanisms

Enhanced coking resistance of Ni cermet anodes for solid oxide fuel cells based on methane on‐cell reforming by a redox‐stable double‐perovskite Sr 2 MoFeO 6‐δ

Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties

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Effects of the atmosphere and Mn doping on the electrical properties of Sr₂Fe_1−xMn_xNbO₆ and their mechanisms

Effects of the atmosphere and Mn doping on the electrical properties of Sr₂Fe_1−xMn_xNbO₆ and their mechanisms

Enhanced coking resistance of Ni cermet anodes for solid oxide fuel cells based on methane on‐cell reforming by a redox‐stable double‐perovskite Sr ₂ MoFeO _6‐δ