Effect of Microwave Sintering on the Properties of Zirconia Based Ceramic Electrolytes for Solid Oxide Fuel Cells

Sharma, Payal; Singh, Kajal; Singh, Anirudh P.; Sharma, Chetan; Mago, Sonia

doi:10.1080/0371750x.2019.1578695

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…The ionic conductivity depends on the size and concentration of the dopant, in which yttria is the most common dopant for stabilizing the cubic phase of zirconia. When the Y2O3 content increases, the crystal structure of ZrO2 transforms from monoclinic to tetragonal and further transforms to the cubic phase when the yttria addition up to 8 mol% (Sharma et al, 2016). When the ZrO2 is prepared from ZrSiO4 sand as a side product of tin mining plant, it is known that the addition of Y2O3 also transforms the structure to cubic, as confirmed by peaks at 2 of 30.…”

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

Electrical Properties of Various Composition of Yttrium Doped-Zirconia Prepared from Local Zircon Sand

Rahmawati¹,

Permadani²,

Syarif³

et al. 2017

IJTech

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Doping yttrium ions, Y 3+ into ZrO2 produced Yttria-Stabilized Zirconia, YSZ. Various amount of yttrium ions could provide different ionic conductivity. This research investigated electrical conductivity of various YSZ composition, i.e., 4.5; 8.0 and 10% mol yttrium in ZrO2. The ZrO2 powder used was synthesized from zircon sand, a side product of tin mining plant, Bangka Island, Indonesia. Structural investigation on the prepared YSZ found that yttrium ion doping has changed the crystal structure of ZrO2 from monoclinic to cubic, even though the monoclinic and tetragonal are also still exist. The Y 3+ doping changed the cell parameter of ZrO2 crystal. It indicates that the Y 3+ entered into the ZrO2 structure and produced vacancy sites. The highest ionic conductivity is provided by 8% mol Yttrium doping or 8YSZ, i.e., 2.74×10 -4 S.cm -1 at 700 o C with an activation energy of 0.741 eV.

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Section: Introductionmentioning

confidence: 92%

“…The result is different when the commercial ZrO2 is used, in which doping of > 7 mol % produced the single cubic phase, while a 2-6 mol% Y2O3 content gives a partially stabilized (Sharma et al, 2016). Other researcher found 8-10 mol% Y2O3 that result in a fully cubic phase (Ochrombel et al, 2010).…”

Section: Introductionmentioning

confidence: 96%

Electrical Properties of Various Composition of Yttrium Doped-Zirconia Prepared from Local Zircon Sand

Rahmawati¹,

Permadani²,

Syarif³

et al. 2017

IJTech

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“…Solid oxide fuel cell (SOFC) electrolytes continue to be actively researched and developed [ 1 , 2 , 3 ]. ZrO 2 doped with Sc 2 O 3 has proven to be a suitable material for the electrolyte because, in addition to good mechanical properties, it is characterized by the highest ionic conductivity among zirconia-based SOFC electrolytes [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. This is due to the fact that a dopant ion should have an ionic radius as close as possible to the ionic radius of a host ion, i.e., zirconium.…”

Section: Introductionmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Analysis of Scandia-Ceria-Stabilized Zirconia Composites with Different Transport Properties

et al. 2023

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This work aims to study a possible modification in the electronic structure of scandia-ceria-stabilized zirconia (10Sc1CeSZ) ceramics sintered at different temperatures. In addition to using X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance spectroscopy to investigate the structural and electrical properties, we employed X-ray photoelectron spectroscopy (XPS) to determine the chemical state information of the atoms involved, along with compositional analysis. As expected, a significant increase in grain ionic conductivity with the sintering temperature was present. This increase was accompanied by a decrease in the porosity of the samples, an increase in the grain size, and a transformation from the rhombohedral to the cubic phase. The phase transformation was detected not only using XRD, but also using XPS and, for this type of ceramic, XPS detected this transformation for the first time. In addition to the changes in the structural characteristics, the increase in the ionic conductivity was accompanied by a modification in the electronic structure of the ceramic surface. The XPS results showed that the surface of the ceramic sintered at the lower temperature of 1100 °C had a higher amount of Zr–OH bonds than the surface of the ceramic sintered at the higher temperature of 1400 °C. The existence of these Zr–OH bonds was confirmed using Fourier-transform infrared spectroscopy (FTIR). From this result, taken together with the difference between the oxygen/zirconium ratios in these ceramics, also identified using XPS, we conclude that there were fewer oxygen vacancies in the ceramic sintered at the lower temperature. It is argued that these two factors, together with the changes in the structural characteristics, have a direct influence on the conductive properties of the studied ceramics sintered at different temperatures.

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“…Therefore, it is necessary to use stabilization agents for ZrO2like MgO, CaO, Y2O3, or other rare earth oxides [3]. In this work, yttria (Y 2 O 3 ) is used for the synthesis of 8mol%yttria stabilized Zirconia (8YSZ) due to its known excellent oxide ion conductivity above 800°C, chemical and thermodynamic stability, and mechanical strength [4]. The ionic conductivity of the stabilized Zirconia qualifies it as an electrolyte for the synthesis of SOFC as an alternative and clean energy source [5].…”

Section: Introductionmentioning

confidence: 99%

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

Al-Attar¹,

Farid²,

Hashim³

2020

ETJ

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In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

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Effect of Microwave Sintering on the Properties of Zirconia Based Ceramic Electrolytes for Solid Oxide Fuel Cells

Cited by 10 publications

References 15 publications

Electrical Properties of Various Composition of Yttrium Doped-Zirconia Prepared from Local Zircon Sand

Electrical Properties of Various Composition of Yttrium Doped-Zirconia Prepared from Local Zircon Sand

X-ray Photoelectron Spectroscopy Analysis of Scandia-Ceria-Stabilized Zirconia Composites with Different Transport Properties

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

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