Electrical, structural and thermal properties of nanoceramic (Bi2O3)1−x−y(Ho2O3)x(Tm2O3)y ternary system

Durmuş, Semra; Çorumlu, Vahit; Çifci, T.; Ermiş, İsmail; Matmon, Ari

doi:10.1016/j.ceramint.2012.12.024

Cited by 27 publications

(9 citation statements)

References 22 publications

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“….98, 1.02 eV, respectively. All these obtained conductivity and activation energy values of the samples are in a good agreement with the results obtained from similar studies in literature [17,28,40]. Figure 5 shows SEM images of A group samples of (Bi…”

Section: Electrical Conductivity Measurementssupporting

confidence: 90%

“…This temperature range is called intermediate temperature range (IT) and the solid oxide fuel cells operating in this temperature range are named the intermediate temperature solid oxide fuel cells (IT-SOFCs). Most of the electrolytes studied by the researchers so far are the bismuth-based electrolytes since they have superb ionic conductivity (≈0.1 S cm −1 ) at IT range [17][18][19]. Additionally, these bismuth-based electrolytes show that they have high conductivity rapid start-up, but not have better stability, improved durability and higher robustness compared to zirconium-based electrolytes [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, these bismuth-based electrolytes show that they have high conductivity rapid start-up, but not have better stability, improved durability and higher robustness compared to zirconium-based electrolytes [19][20][21]. These studies, especially, have been concentrated on bismuthbased binary [22][23][24] and ternary type ceramic electrolytes [17,[25][26][27][28] to improve their conductivity, stability and durability. Researchers studying the binary system electrolytes have observed that nearly all of them have the stable cubic δ-Bi 2 O 3 phase and their conductivities vary from ≈10 −7 to ≈10 −2 S cm −1 [20,29].…”

Section: Introductionmentioning

confidence: 99%

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Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

et al. 2016

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In present study, Ho2O3 and Dy2O3 doped Bi2O3 composite materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) were investigated. (Bi2O3)1−x−y(Ho2O3)x(Dy2O3)y ternary systems (x = 0.11, 0.13, 0.15 and y = 0.01, 0.03, 0.05, 0.07) were fabricated using conventional solid-state synthesis techniques. The samples were characterized by means of X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, differential thermal analysis/thermal gravimeter, and the four-point probe technique. X-ray powder diffraction measurements indicated that all samples have the stable fluorite type face centered cubic (fcc) δ-Bi2O3 phase. Scanning electron microscopy micrographs of all of the samples showed that grain size distribution was uniform. Four-point probe technique measurements showed that the conductivity of the samples increase with increase of temperature. Additionally, it has been found that the maximum conductivity values of all samples fall in a range 8.44 × 10 −2 −4.60 × 10 −1 S cm −1 and their conductivity values corresponding to the intermediatetemperature region vary in the range 1.65 × 10 −3 −2.30 × 10 −1 S cm −1. The activation energy values of the samples were calculated from log σ graphics versus 1000/T using the Arrhenius equation. It was found that there is a good agreement between the activation energy values and conductivity values.

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Section: Electrical Conductivity Measurementssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

et al. 2016

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“…In summary, the Bi 103 V 5 O 167 conductivity of 0.283 S cm -1 at 800 °C is one of the highest among all published V-containing Bi 2 O 3 phases [31,[49][50][51][52]. This is valid also for δ-Bi 2 O 3 type phases doped and double doped with other cations such as Nb and various lanthanides [53][54][55][56][57][58][59]. The closest value of conductivity (0.75 S cm -1 ) was obtained for Bi 12 Tb 3 O 22.5 but at 880 °C [1] and for Tm-doped δ-Bi 2 O 3 type phases (0.312 -0.398 S cm -1 at 800 °C dependently of Tm content) [21].…”

Section: Resultsmentioning

confidence: 80%

Fast oxide-ion conductors in Bi2O3-V2O5 system: Bi108-xVxO162+x(x=4-9) with 3×3×3 superstructure

et al. 2021

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In this study, the possibility to stabilize O2-ion conductors in Bi2O3-V2O5 system was investigated. Six pseudo-binary Bi2O3-V2O5 mixtures [3.50 < x(V2O5) < 8.50 mol%] were thermally treated at 1000?C for 1 h. The samples were characterized by XRD, HRTEM/SAED, DTA and EIS techniques. The high-temperature reaction between ? Bi2O3 and V2O5 resulted in formation of microcrystalline single-phase specimens containing the phase based on ?-Bi2O3 if V2O5 content was ? 4.63 mol%. The obtained phases exhibited main diffraction peaks corresponding to the simple cubic ?-Bi2O3 (space group Fm-3m) but Rietveld refinement showed a threefold repeat on a simple cubic sublattice indicating that the true unit cell is 3?3?3 supercell. Within proposed supercell, the octahedrally coordinated V5+ ions fully occupy 4a Wyckoff position and partially occupy 32f. The Bi3+ ions are placed at the rest of 32f and at 24e and 48h with full occupation. In total, 22 % of anionic sites are vacant. The ionic conductivity of phase with the lowest dopant content, i.e. Bi 103V5O167, amounts 0.283 S cm-1 at 800?C with the activation energy of 0.64(5) eV, which is comparable to the undoped ?-Bi2O3 known as the fastest ion conductor.

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“…can be stable down to room temperature by using a very slow cooling rate [221,222]. δ-Bi 2 O 3 has been known to have high O 2− ionic conductivity owing to its high concentration of intrinsic oxygen vacancies (25%) [223].…”

Section: Bismuth-based Electrolytesmentioning

confidence: 99%

Progress in Material Development for Low-Temperature Solid Oxide Fuel Cells: A Review

Vostakola

Horri

2021

Energies

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Solid oxide fuel cells (SOFCs) have been considered as promising candidates to tackle the need for sustainable and efficient energy conversion devices. However, the current operating temperature of SOFCs poses critical challenges relating to the costs of fabrication and materials selection. To overcome these issues, many attempts have been made by the SOFC research and manufacturing communities for lowering the operating temperature to intermediate ranges (600–800 °C) and even lower temperatures (below 600 °C). Despite the interesting success and technical advantages obtained with the low-temperature SOFC, on the other hand, the cell operation at low temperature could noticeably increase the electrolyte ohmic loss and the polarization losses of the electrode that cause a decrease in the overall cell performance and energy conversion efficiency. In addition, the electrolyte ionic conductivity exponentially decreases with a decrease in operating temperature based on the Arrhenius conduction equation for semiconductors. To address these challenges, a variety of materials and fabrication methods have been developed in the past few years which are the subject of this critical review. Therefore, this paper focuses on the recent advances in the development of new low-temperature SOFCs materials, especially low-temperature electrolytes and electrodes with improved electrochemical properties, as well as summarizing the matching current collectors and sealants for the low-temperature region. Different strategies for improving the cell efficiency, the impact of operating variables on the performance of SOFCs, and the available choice of stack designs, as well as the costing factors, operational limits, and performance prospects, have been briefly summarized in this work.

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Electrical, structural and thermal properties of nanoceramic (Bi2O3)1−x−y(Ho2O3)x(Tm2O3)y ternary system

Cited by 27 publications

References 22 publications

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Fast oxide-ion conductors in Bi2O3-V2O5 system: Bi108-xVxO162+x(x=4-9) with 3×3×3 superstructure

Progress in Material Development for Low-Temperature Solid Oxide Fuel Cells: A Review

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Electrical, structural and thermal properties of nanoceramic (Bi2O3)1−x−y(Ho2O3)x(Tm2O3)y ternary system

Cited by 27 publications

References 22 publications

Synthesizing of (Bi2O3)1-x-y(Ho2O3)x(Dy2O3)yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Synthesizing of (Bi2O3)1-x-y(Ho2O3)x(Dy2O3)yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Fast oxide-ion conductors in Bi2O3-V2O5 system: Bi108-xVxO162+x(x=4-9) with 3×3×3 superstructure

Progress in Material Development for Low-Temperature Solid Oxide Fuel Cells: A Review

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Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells