High electrical conductivity at room temperature of MnCo2O4 cobaltite spinel prepared by sol–gel method

Zaouali, A.; Dhahri, A.; Boughariou, A.; Dhahri, E.; Barille, Régis; Costa, B. F. O.; Khirouni, K.

doi:10.1007/s10854-020-04895-2

Cited by 17 publications

(9 citation statements)

References 60 publications

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“…In that case, the conductivity mechanism will be based on electron hopping between Fe 3+ + e– ↔ Fe 2+ . On the other hand, Co 2 MnO 4 has p-type conductivity . In this spinel, both Co 3+ and Mn 3+ cations are located in the octahedral sites, and conductivity is based on electron hopping on these species, especially between Mn 3+ and Mn 4+ .…”

Section: Resultsmentioning

confidence: 99%

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Laqdiem,

Garcia-Fayos,

Carrillo

et al. 2023

ACS Appl. Energy Mater.

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Oxygen transport membranes (OTMs) are a promising oxygen production technology with high energy efficiency due to the potential for thermal integration. However, conventional perovskite materials of OTMs are unstable in CO 2 atmospheres, which limits their applicability in oxycombustion processes. On the other hand, some dual-phase membranes are stable in CO 2 and SO 2 without permanent degradation. However, oxygen permeation is still insufficient; therefore, intensive research focuses on boosting oxygen permeation. Here, we present a novel dual-phase membrane composed of an ion-conducting fluorite phase (Ce 0.8 Tb 0.2 O 2−δ , CTO) and an electronic-conducting spinel phase (Co 2 MnO 4 , CMO). CMO spinel exhibits high electronic conductivity (60 S•cm −1 at 800 °C) compared to other spinels used in dual-phase membranes, i.e., 230 times higher than that of NiFe 2 O 4 (NFO). This higher conductivity ameliorates gas−solid surface exchange and bulk diffusion mechanisms. By activating the bulk membrane with a CMO/ CTO porous catalytic layer, it was possible to achieve an oxygen flux of 0.25 mL•min −1 •cm −2 for the 40CMO/60CTO (% vol ), 680 μm-thick membrane at 850 °C even under CO 2 -rich environments. This dual-phase membrane shows excellent potential as an oxygen transport membrane or oxygen electrode under high CO 2 and oxycombustion operation.

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Section: Resultsmentioning

confidence: 99%

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Laqdiem,

Garcia-Fayos,

Carrillo

et al. 2023

ACS Appl. Energy Mater.

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“… 68 As for the second frequency region, it is where electrical conductivity increases with frequency as described by Jonscher's law following this equation: 69 σ ac ( ω ) = σ dc + Aω s where: A the constant depends only on temperature, σ ac is the dc conductivity, ω is the angular frequency, and s is an exponent that presents the degree of interaction between the mobile ions and the surrounding lattices. 70 …”

Section: Resultsmentioning

confidence: 99%

Study of physical properties of the Li_0.5MgFe_1.5O_3.5 ferrite nanoparticles

et al. 2023

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“…50,51 The dielectric constant is related primarily to the electronic and ionic polarization at high frequencies, whenever it reduces to low values and becomes temperature independent. 52 Our compound is, therefore, a good candidate for potential industrial applications, especially as a capacitor device. 53…”

Section: Dielectric Properties As a Function Of Frequenciesmentioning

confidence: 99%

Effect of frequency on the classical and relaxor ferroelectric behavior of substituted titanate Ba_0.7Er_0.16Ca_0.05Ti_0.91Sn_0.09O₃

Saïdi

Mabrouki

Dhahri

et al. 2023

Phys. Chem. Chem. Phys.

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High electrical conductivity at room temperature of MnCo2O4 cobaltite spinel prepared by sol–gel method

Cited by 17 publications

References 60 publications

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Study of physical properties of the Li_0.5MgFe_1.5O_3.5 ferrite nanoparticles

Effect of frequency on the classical and relaxor ferroelectric behavior of substituted titanate Ba_0.7Er_0.16Ca_0.05Ti_0.91Sn_0.09O₃

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High electrical conductivity at room temperature of MnCo2O4 cobaltite spinel prepared by sol–gel method

Cited by 17 publications

References 60 publications

Co2MnO4/Ce0.8Tb0.2O2−δ Dual-Phase Membrane Material with High CO2 Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Co2MnO4/Ce0.8Tb0.2O2−δ Dual-Phase Membrane Material with High CO2 Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Study of physical properties of the Li0.5MgFe1.5O3.5 ferrite nanoparticles

Effect of frequency on the classical and relaxor ferroelectric behavior of substituted titanate Ba0.7Er0.16Ca0.05Ti0.91Sn0.09O3

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Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Study of physical properties of the Li_0.5MgFe_1.5O_3.5 ferrite nanoparticles

Effect of frequency on the classical and relaxor ferroelectric behavior of substituted titanate Ba_0.7Er_0.16Ca_0.05Ti_0.91Sn_0.09O₃