A comparative structural, thermal and electrical study of Ca2+, Sr2+ substituted BiMnO3

Thakur, Samita; Pandey, O.P.; Singh, K.

doi:10.1016/j.ssi.2014.09.022

Cited by 12 publications

(5 citation statements)

References 33 publications

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“…Operating in such high temperatures could result in a decreased lifetime of the cell, low compatibility between the components, high thermal degradation of cell's materials, a long time of start-up, and higher costs. Thus, lowering the operating temperature to low temperatures like < 600 ᵒC or to intermediate temperatures 600-800 ᵒC is essential to address these problems to have the possibility to chooses among various materials, with different characteristics, that can work in lower temperatures without having the problems mentioned above for fuel cell's components used in high temperatures [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Reduction of operation temperature in SOFCs utilizing perovskites: Review

Delibaş

GHARAMALEKİ

MANSOURİ

et al. 2022

International Advanced Researches and Engineering Journal

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Fuel cells are electrochemical devices utilized for converting chemical energy to electrical energy. Solid Oxide Fuel Cells (SOFCs) have several advantages over other kinds. For instance, high energy efficiency expanded fuel flexibility, low environmental pollutant emission are the properties of SOFCs that make them superior to other fuel cell types. Due to these special characteristics, SOFCs are gained a great deal of attraction. These fuel cells consist of different main operating parts, a cathode, an anode, and electrolyte which each of them demands special materials to operate with the most efficiency. SOFCs mostly operate in high temperatures (800-1000 ᵒC). Reducing the operating temperature to lower than 600 ᵒC or intermediate temperatures 600-800 ᵒC is one of the methods that can make them more practical devices. Perovskite oxides can be used effectively as all main parts of SOFCs because of their excellent properties like electrical and ionic conductivities, oxygen ion vacancies, great catalytic properties, thermal durability, and chemical stability to decrease the operating temperature. In this review, numerous perovskite-based materials utilized in the anode and the cathode electrodes of SOFCs are investigated in the most recent, advanced, and novel works. The perovskite materials, their properties, and their influence on the fuel cell's performance, and in some cases the sulfur tolerance of the materials when H2S co-exists in the fuel of the fuel cell are reviewed in this paper Adding different dopants in A-site and B-site of the perovskite oxides is the most effective way to modify the characteristics of the materials. This review can provide great data on the possible perovskite oxides with the capability of enhancing the efficiency of SOFCs by reducing the operating temperature, and their most decisive and significant characteristics, like composition, structure, electrical conductivity, electrochemical and mechanical properties for research groups working on solid oxide fuel cells.

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Section: Introductionmentioning

confidence: 99%

Reduction of operation temperature in SOFCs utilizing perovskites: Review

Delibaş

GHARAMALEKİ

MANSOURİ

et al. 2022

International Advanced Researches and Engineering Journal

View full text Add to dashboard Cite

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“…Decrease in grain size is observed with the increase in amount of Ca 2 þ dopant. Thus, it can be suggested that Ca 2 þ is acting as grain growth inhibitor [27]. In addition to this, higher concentration of dopant particularly Ca 2 þ leads to increase the liquid phase sintering as can be seen in Fig.…”

Section: Microstructural Analysismentioning

confidence: 87%

Effect of two different dopants (Mg2+ and Ca2+) and processing parameters on γ-phase stabilization and conductivity of Bi4V2O11−δ

Gupta

Singh

2015

Ceramics International

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“…7 presents surface morphology of MCNS ceramics after sintering at 1175 ℃, showing high density and regular morphology. Nonetheless, it can be seen that the grain size of ceramics decreased from 10-12 μm (A0 )to 3-4 μm (A2) after Sr-doping, indicating that a small amount of Sr dopant hinders the grain growth during sintering due to the dragging effect [21]. On the other hand, the surplus Sr in A3 ceramic may cluster at the grain boundaries and improve the transport rate for grain coarsening [22].…”

Section: Structure and Density Analysismentioning

confidence: 98%

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

Zhang

Thayil

et al. 2020

Preprint

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Herein, the Mn1.95-xCo0.21Ni0.84SrxO4 (MCNS) (0 ≤ x ≤ 0.15) negative temperature coefficient (NTC) materials are prepared by co-precipitation method. The replacement of Mn by Sr plays a critical role in controlling the lattice parameter, relative density, microstructure and electrical properties. The lattice parameter and relatively density increase with the increase of Sr content. Moreover, a small amount of Sr retards the grain growth and increases the bulk density. Moreover, the ρ25, B25/50, Ea and α values of MCNS ceramics are influenced by the Sr content and ranged from 1535.0-2024.1 Ω•cm, 3654–3709 K, 0.3149–0.3197 eV and 4.111–4.173%, respectively. The XPS results explain the transformation of MCNS ceramics from n- to p-type semiconductors. Moreover, the aging coefficient (△R/R) of MCNS ceramics is found to be < 0.2%, which indicates the stable distribution of cations in the spinel. Finally, the MCNS ceramics demonstrate excellent thermal durability with < 1.3% of resistance shift after 100 thermal shock cycles.

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A comparative structural, thermal and electrical study of Ca2+, Sr2+ substituted BiMnO3

Cited by 12 publications

References 33 publications

Reduction of operation temperature in SOFCs utilizing perovskites: Review

Reduction of operation temperature in SOFCs utilizing perovskites: Review

Effect of two different dopants (Mg2+ and Ca2+) and processing parameters on γ-phase stabilization and conductivity of Bi4V2O11−δ

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

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