Electrical properties of triple-doped bismuth oxide electrolyte for solid oxide fuel cells

Gönen, Yunus Emre; Ermiş, İsmail; Matmon, Ari

doi:10.1080/01411594.2016.1150471

Cited by 10 publications

(5 citation statements)

References 28 publications

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“…From the results of other authors, these activation energies are close to those determined for Dy 2 O 3 –WO 3 –Bi 2 O 3 ternary compositions [ 31 ] and smaller than quaternary Bi 2 O 3 –Tb 4 O 7 –Ho 2 O 3 –Dy 2 O 3 compositions. [ 40 ] The lower activation energies of our materials suggest high lattice disorder promoted by the oxygen vacancies, converse to the high activation energy, which enhances the oxygen sub lattice stability as in (Bi 2 O 3 ) 0.705 (Er 2 O 3 ) 0.245 (WO 3 ) 0.05 ternary compositions. [ 42 ] Hence, the ionic conductivity tends to reduce due to a carrier mobility reduction in low Sc 3+ concentrations and an increase in the activation energy due to a decrease in the polarization energy.…”

Section: Resultsmentioning

confidence: 93%

“…[ 39 ] Here, the maximum Sc 3+ concentration (0.06) reached 0.102 Scm −1 at 700 °C (see Table 2 ). The ionic conductivity results appear similar at intermediate temperatures for neodymium and rhenium double‐doped δ‐Bi 2 O 3 phase (ternary system), [ 8 ] and superior to (Bi 2 O 3 ) (0.8– x ) (Tb 4 O 7 ) 0.1 (Ho 2 O 3 ) 0.1 (Dy 2 O 3 ) x quaternary systems [ 40 ] and (Bi 2 O 3 ) 1− x − y (CeO 2 ) x (Eu 2 O 3 ) y ternary systems. [ 41 ] From the Arrhenius graph (Figure 3), the activation energy for the transport of oxygen ions through oxygen vacancies reduces from 0.49 to 0.32 eV as the Sc 3+ content increases in the solid solution.…”

Section: Resultsmentioning

confidence: 99%

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Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

Ramirez-Dela Cruz,

Bocanegra-Bernal,

Márquez-Torres

et al. 2024

Physica Status Solidi (a)

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Quaternary compositions of polycrystalline Bi1.74Dy0.14W0.12−xScxO3 (x = 0.02, 0.03, 0.04, 0.05, 0.06) solid solutions are synthesized by the solid‐state reaction method. The 4a site symmetry of the space group occupied by Sc3+ ion retains the cubic fluorite‐type over a wide temperature range (450–700 °C) for low Sc3+ content without losing the δ‐phase. Dielectric and ionic conductivity by complex impedance in the frequency range from 0.1 to 100 kHz suggests a temperature‐ and Sc3+‐dependent relaxation process. The ionic conductivity increases with the Sc3+ content over the whole tested temperature range. An oxygen ion conductivity of 0.102 Scm−1 at 700 °C and an activation energy of 0.32 eV are achieved for x = 0.06. Optical properties and Rietveld refinement indicate a bandgap reduction due to a bond length reduction (Bi—O). These materials have potential in photocatalysis and water‐splitting technology due to their UV and visible region absorption capabilities.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

Ramirez-Dela Cruz,

Bocanegra-Bernal,

Márquez-Torres

et al. 2024

Physica Status Solidi (a)

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“…On the other hands, the peak broadening, which indicates an increase in crystal defect density in the lattice, was observed on the XRD pattern as the total doping ratio increases while the average crystal size decreased [23]. These defects may be generally originated from the misplacement of the dopant cations in the lattice due to excessive doping (>35%) as well as the polarizability effects of each cation in lattice.…”

Section: Microstructure Analysismentioning

confidence: 98%

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

Balcı

Matmon

Polat

2021

Preprint

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In this study, the effects of multi-doping strategy on phase stabilization and electrical conductivity for the doped Bi 2 O 3 system were investigated. All solid mixtures were created by solid state reactions according to a certain stoichiometric ratio in atmospheric conditions. The structural, electrical, thermal and surface characterizations of the created samples were performed by x-ray diffraction method (XRD), four point-probe technique (4-PPT), differential thermal analysis/thermo gravimetric analysis (DTA/TGA) and scanning electron microscope (SEM), respectively. From XRD results, it was seen that the fcc δ-phase could be stabilized by using only 1:1:1:2 or 2:2:2:1 dopant content ratio (in here, “1:” is corresponds to” 5%” mole). The other compounds prepared out of this ratios were mixed phase because of the containing both α-phase peaks and δ-phase peaks on their XRD pattern. When the all samples were compared in terms of electrical conductivity at 750 °C, it was observed that the fcc δ-phase stabilized samples exhibited higher conductivity than that of other compounds as expected. The highest electrical conductivity was for the sample, dopant content ratios of which are 1: 1: 1: 2, with 0.014 S.cm -1 at 750 °C and also it had the lowest activation energy (0.51 eV) among all samples. On the other hand, according to the thermal analysis results, it was concluded that phase transition occurred only on the DTA curve of the sample given with dopant content ratios 1:1:1:1 due to presence of endothermic peak on its DTA curve at 729°C during the heating process. Also, for this sample, it was clearly predicted from the electrical conductivity graphs depending on temperature that the phase transition occurred at just that temperature (729 °C) due to the sudden increase in conductivity by indicating phase transition from the α-phase to the cubic δ-phase. The SEM analysis pointed out that grain size decreased as total dopant ratio increased and also the grain boundary changed sharply with the increase in the total dopant ratio.

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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 properties of triple-doped bismuth oxide electrolyte for solid oxide fuel cells

Cited by 10 publications

References 28 publications

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

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

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Electrical properties of triple-doped bismuth oxide electrolyte for solid oxide fuel cells

Cited by 10 publications

References 28 publications

Dielectric and Optical Properties of δ‐Bi2O3 Quaternary Semiconducting Solid Solutions

Dielectric and Optical Properties of δ‐Bi2O3 Quaternary Semiconducting Solid Solutions

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

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

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Product

Resources

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Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions