Sr2+-Gd3+ co-doped CeO2: A cost-effective variant for IT-SOFC electrolytes

Maheshwari, Aditya V.; Wiemhöfer, Hans‐Dieter

doi:10.1016/j.ceramint.2015.03.317

Cited by 33 publications

(8 citation statements)

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“…The rare earth and alkaline earth ions (Gd 3+ , Sm 3+ , Y 3+ , Ca 2+ and Sr 2+ ) doped ceria at different concentrations have been extensively studied as an upcoming alterna-tive solid electrolyte to YSZ [6][7][8][9][10]. Among them, Gd 3+ doped ceria (GDC) is considered as promising electrolyte material due to its high oxygen ion conductivity, low polarization resistance and compatibility with electrodes [5,11].…”

Section: Introductionmentioning

confidence: 99%

“…Co-doped ceria was studied by Arabaci [19], who showed that Ce 0.9-x Gd 0.1 Er x O 1.9-x/2 materials can be used as electrolytes for IT-SOFC applications instead of GDC. Maheshwari [7] found that Sr 2+ -Gd 3+ co-doped CeO 2 samples show significantly higher total electrical than the electronic conductivities which recommended them as good materials for SOFC electrolytes. The addition of 1 mol% CuO in gadolinium doped ceria showed no detrimental effect on the total electrical conductivity [20].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Mg2+ addition on structure and electrical properties of gadolinium doped ceria electrolyte ceramics

Cheng

Tian

Yang

2019

PAC

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Series of Gd 3+ and Mg 2+ co-doped ceria (Ce 0.8 Gd 0.2-x Mg x O 1.9-δ ) powders were prepared by a sol-gel method and electrolyte ceramics were obtained by sintering at 1300°C. Thermogravimetric and differential scanning calorimetry, X-ray diffraction, scanning electron microscope and electrochemical impedance spectroscopy were used for structural, morphology and electrical characterization of the prepared samples. Well crystalline cubic fluorite structured composite was confirmed after calcination at 700°C and the electrolyte ceramics sintered at 1300°C for 4 h was quite dense with uniform microstructure. The electrochemical analysis results displayed that the highest conductivity has the Ce 0.8 Gd 0.14 Mg 0.06 O 1.87 compound, i.e. 0.0203 S/cm at 800°C. Therefore, it was concluded that co-doping with Gd 3+ and Mg 2+ could enhance the electrical properties of the CeO 2 based solid electrolytes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Mg2+ addition on structure and electrical properties of gadolinium doped ceria electrolyte ceramics

Cheng

Tian

Yang

2019

PAC

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“…Powder preparation, solid forming and high temperature sintering are three important stages of electrolyte preparation process.Therefore, there are many factors affecting the ionic conductivity.Recent reports have suggested that co-doping strategy is an effective method for improving electrical conductivity of solid electrolytes [5,6] .…”

Section: 、Introductionmentioning

confidence: 99%

Synthesis of Bismuth Doped Yttria Stabilized Zirconia Electrolyte and Study of Ionic Conductivity

Guo

Zhao

Liu

et al. 2021

Preprint

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x%molBi3+-doped yttria-stabilized zirconia with 4%molYO1.5 (x = 0–5,BiYSZ) are prepared via lamellar liquid crystal template method.The influence of different doping amount of Bi3+ on crystal form,morphology,the ionic conductivity are investigated in detail.In addition,densification time of BiYSZ are determined.X-ray diffraction(XRD),Raman spectrum,Scanning Electron Microscope(SEM) results show that BiYSZ powder with stable tetragonal phase and spherical structure is nanometer level.Moreover,by using the Ac impedance spectroscopy to analyse conductivity of solid electrolytes,we find that Bi3+-doped yttria-stabilized zirconia with 4%molYO1.5 improve the ionic conductivity.Comparing all the compositions,3mol%Bi3+ doped yttria stabilized zirconia with 4%molY3+ gives the highest ionic conductivity of 7.41×10− 5 S/cm− 1 at 500℃,and sintering temperatures of BiYSZ reduce around 100℃ than Y0.04Zr0.96O2(4YSZ),ionic conductivity increases one order of magnitude.

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“…Therefore, introducing cost-effective alkaline-earth metals as secondary (co)dopants to replace one of the RE metals in the composition might produce electrolytes with improved electrical properties and could reduce the cost as well. 40 Although the reported ionic conductivities of most of the singly doped/codoped ceria are fair enough (∼10 −2 −10 −3 S•cm −1 ) in the intermediatetemperature (673−1073 K) range, maximizing the ionic conductivity to a large extent is still challenging because of the limitation of the doping concentration. Zhu et al 41 has introduced the concept of two-phase ceria-based composites (CBCs) and suggested that the ionic conductivity of ceria can be further enhanced by introducing a secondary carbonate phase as the core−shell structure, where the doped ceria (core) is covered by an amorphous sodium carbonate layer (shell).…”

Section: Introductionmentioning

confidence: 99%

Codoped Ceria Ce_0.8M_0.1Gd_0.1O_2−δ (M = Sm³⁺, Sr²⁺, Ca²⁺) and Codoped Ceria–Na₂CO₃ Nanocomposite Electrolytes for Solid Oxide Fuel Cells

Kumar¹,

Kuppusami²,

Vigneshwaran³

et al. 2019

ACS Appl. Nano Mater.

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This work reports the coprecipitation synthesis and characterization of single-phase Sm3+/Sr2+/Ca2+ codoped with Gd3+ in cerium oxide formulated as Ce0.8M0.1Gd0.1O2−δ (CMGO; M = Sm3+, Sr2+, Ca2) nanopowder and their nanocomposites with sodium carbonate formulated as Ce0.8M0.1Gd0.1O2−δ–Na2CO3 (CMGO-NC). The structural properties of both the CMGO and CMGO-NC compositions were investigated by X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM) techniques. The XRD results revealed that the crystallite sizes of the codoped ceria–sodium carbonate nanocomposite (CMGO-NC) were lower (∼8–15 nm) than their corresponding single-phase codoped ceria compositions. CMGO-NC has shown improved electrical conductivity in the intermediate temperature range (673–973 K), as measured by alternating-current impedance spectroscopy. The highest total electrical conductivity was found to be σ973 K = 2.3 mS·cm–1 with significantly reduced activation energy (E a = 0.63 eV) for Ca–Gd-codoped ceria–sodium carbonate Ce0.8Ca0.1Gd0.1O1.85–Na2CO3 (CaG-NC). The morphologies of both the single-phase CaG and corresponding CaG-NC nanocomposite were investigated by field-emission scanning electron microscopy (FESEM) and HRTEM techniques in order to determine the size and shape effect by the sodium carbonate addition to the codoped ceria nanopowders. The FESEM images of the CaG-NC nanomposite showed significantly reduced particle size. The HRTEM images revealed that the secondary Na2CO3 phase was found to be an amorphous layer that has covered codoped ceria (Ce0.8Ca0.1Gd0.1O1.85) particles as a core–shell structure. The X-ray photoelectron microscopy studies support the CaG-NC composition and surface interaction between the carbonate and crystalline CaG phases. Enhancement in the net electrical conductivity of nanocomposites could be due to the reduced particle size and the core–shell morphology, which enables the superionic interfacial conduction in the composite. The CaG-NC core–shell nanocomposite is proposed to be a cost-effective variant of the solid electrolyte with improved electrical properties for operating solid oxide fuel cells at low/intermediate temperature (673–973 K).

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Sr2+-Gd3+ co-doped CeO2: A cost-effective variant for IT-SOFC electrolytes

Cited by 33 publications

References 31 publications

Effects of Mg2+ addition on structure and electrical properties of gadolinium doped ceria electrolyte ceramics

Effects of Mg2+ addition on structure and electrical properties of gadolinium doped ceria electrolyte ceramics

Synthesis of Bismuth Doped Yttria Stabilized Zirconia Electrolyte and Study of Ionic Conductivity

Codoped Ceria Ce_0.8M_0.1Gd_0.1O_2−δ (M = Sm³⁺, Sr²⁺, Ca²⁺) and Codoped Ceria–Na₂CO₃ Nanocomposite Electrolytes for Solid Oxide Fuel Cells

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Sr2+-Gd3+ co-doped CeO2: A cost-effective variant for IT-SOFC electrolytes

Cited by 33 publications

References 31 publications

Effects of Mg2+ addition on structure and electrical properties of gadolinium doped ceria electrolyte ceramics

Effects of Mg2+ addition on structure and electrical properties of gadolinium doped ceria electrolyte ceramics

Synthesis of Bismuth Doped Yttria Stabilized Zirconia Electrolyte and Study of Ionic Conductivity

Codoped Ceria Ce0.8M0.1Gd0.1O2−δ (M = Sm3+, Sr2+, Ca2+) and Codoped Ceria–Na2CO3 Nanocomposite Electrolytes for Solid Oxide Fuel Cells

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Codoped Ceria Ce_0.8M_0.1Gd_0.1O_2−δ (M = Sm³⁺, Sr²⁺, Ca²⁺) and Codoped Ceria–Na₂CO₃ Nanocomposite Electrolytes for Solid Oxide Fuel Cells