Synthesis and characterization of nanocrystalline ScSZ electrolyte for SOFCs

Lakshmi, V. V. K.; Bauri, Ranjit; Gandhi, Ashutosh; Paul, Sourabh

doi:10.1016/j.ijhydene.2011.02.139

Cited by 46 publications

(15 citation statements)

References 38 publications

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“…Figure 3 shows the electrical conductivity of the synthesized CeScSZ powders with 1.5 mole% Ce (a), 1.0 mole% Ce (b), 0.75 mole% Ce (c), 0.5 mole% Ce, (d), respectively. As shown in the figure, 1.0 mole% Ce of sample showed the best ionic conductivity of 0.12 S/cm at 800°C among the sample powders, corresponding to the commercial 1Ce10ScSZ powder of 0.1 S/cm at the same temperature (6) and there is the special property that 0.75 mole% Ce of sample has come close to 1 mole% Ce of sample at the low temperature under 700°C, indicating some of characteristic of ceria-based electrolyte (7). However, 1.5 mole% Ce of sample showed lower conductivity than that of 1.0 mole% Ce of sample.…”

Section: Physical Properties Of the Synthesized Electrolytementioning

confidence: 80%

Effect of Ceria Content of CeScSZ Powder on the Phase Stability and Electrical Conductivity of SOFC Electrolyte

Choi

Kim

et al. 2015

ECS Trans.

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The CeScSZ powders with ceria-doped content were synthesized by the co-precipitation process. The crystal lattice parameter and XRD peak pattern of powders were investigated with the increase of calcination temperature and the change of ceria-doping content at a certain calcination temperature. Moreover, ionic conductivities of the CeScSZ powders were studied in the range of 500 to 900°C. Electrolyte film was fabricated using the synthesized 1Ce10ScSZ powder and single cell of SOFC with anode-supported electrolyte was fabricated by a tape casting and co-sintering process. As a result, the SOFC cell showed power density of 1.2 W/cm 2 at 2 A/cm 2 , 800°C with low ohmic resistance of under 0.1 Ω·cm 2 .

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Section: Physical Properties Of the Synthesized Electrolytementioning

confidence: 80%

Effect of Ceria Content of CeScSZ Powder on the Phase Stability and Electrical Conductivity of SOFC Electrolyte

Choi

Kim

et al. 2015

ECS Trans.

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“…The dominance of R gb and Z re at high Al concentration could be explained by the presence of a large number of grain boundaries (small crystallite size) and an amorphous phase of Al and Al 2 O 3 in the grain boundaries, which acted as impurities suppressing oxygen ions diffusion. Moreover, dopant vacancy complexes (vacancy dopant cation dipoles or tripoles) with high association energy formed in ScAlSZ thin films due to high Al 3+ concentration [15,56,57]. The increase of activation energy above 700 • C was also observed for thin films with high Al concentrations.…”

Section: Discussionmentioning

confidence: 91%

Structural and Electrochemical Properties of Scandia Alumina Stabilized Zirconia Thin Films

et al. 2021

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This work presents a systematic investigation of scandia alumina stabilized zirconia (ScAlSZ, composition: ZrO2:Sc2O3:Al2O3 93:6:1 wt.%) thin films (~2 μm). Thin films were formed by the e-beam evaporation method on 450 °C substrates. The influence of Al concentration on thin film microstructure, structure, and electrochemical properties was characterized by EDS, XRD, Raman, and EIS methods. It was found that the aluminum concentration in the deposited thin films decreased with an increase in the deposition rate. The concentration of Al changed from 15.9 to 3.8 at.% when the deposition rates were 0.2 and 1.6 nm/s, respectively. The crystallinity of the thin films depended strongly on the concentration of Al, resulting in an amorphous phase when Al concentration was 22.2 at.% and a crystalline phase when Al concentration was lower. ScAlSZ thin films containing 15.9 at.% of Al had monoclinic and tetragonal phases, while thin films with 1.6 and 3.8 at.% of Al had a mixture of cubic, tetragonal, and monoclinic phases. The phase transition was observed during the thermal annealing process. Cubic and rhombohedral phases formed in addition to monoclinic and tetragonal phases appeared after annealing ScAlSZ thin films containing 15.9 and 22.2 at.% of aluminum. The highest total ionic conductivity (σbulk = 2.89 Sm−1 at 800 °C) was achieved for ScAlSZ thin films containing 3.8 at.% of Al. However, thin films containing a higher concentration of aluminum had more than 10 times lower total conductivity and demonstrated changes in activation energy at high temperatures (>560 °C). Activation energies changed from ~1.10 to ~1.85 eV.

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“…However, in the lower temperature range, the YSZ NPs exhibited activation energies higher than those of the commercial YSZ samples (Table ). The enhancement of ionic conductivity despite the high activation energy is likely because of the increased grain boundary volume or other related factors such as increased ion mobility, changes in the defect concentration in the grain boundary area, or increased contribution of the space charge effect …”

Section: Resultsmentioning

confidence: 99%

Ionic Conductivity of Electrolytes Composed of Oleate-Capped Yttria-Stabilized Zirconia Nanoparticles

Makinose,

Yamada,

Kubota

2023

ACS Omega

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Yttria-stabilized zirconia (YSZ) is a highly promising electrolyte material for solid oxide fuel cells (SOFCs). We investigated the conductivity-enhancing effect of nanosized YSZ to explore key techniques to decrease the operating temperature. YSZ nanoparticles ranging from 2 to 4 nm were synthesized with oleate groups by the hydrothermal method at various oleate/metal ion ratios (Ole/M = 1.00, 0.75, and 0.50). The nanoparticles were sintered, and the ionic conductivities were evaluated. The 1.00 Ole/M sample exhibited high dispersibility in cyclohexane and showed a nearly monodispersed distribution. The other samples possessed agglomerated nanoparticles. The sintered YSZ nanoparticles had densities of 3.36–2.80 g/cm 3 and ionic conductivities of 2.52–1.16 mS/cm at 750 °C, which are higher than those of commercial 8 mol % YSZ. Furthermore, the sintered YSZ nanoparticles exhibited higher activation energies than the commercial samples in the lower temperature range (550–650 °C). The ionic conductivity enhancement despite the high activation energy is likely due to the increased grain boundary volume. This study demonstrated the successful production of YSZ with high ionic conductivity and sinterability upon sintering at 1050 °C using YSZ nanoparticles.

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Synthesis and characterization of nanocrystalline ScSZ electrolyte for SOFCs

Cited by 46 publications

References 38 publications

Effect of Ceria Content of CeScSZ Powder on the Phase Stability and Electrical Conductivity of SOFC Electrolyte

Effect of Ceria Content of CeScSZ Powder on the Phase Stability and Electrical Conductivity of SOFC Electrolyte

Structural and Electrochemical Properties of Scandia Alumina Stabilized Zirconia Thin Films

Ionic Conductivity of Electrolytes Composed of Oleate-Capped Yttria-Stabilized Zirconia Nanoparticles

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