Preparation and Characterization of Samaria‐Doped Ceria Electrolyte Materials for Solid Oxide Fuel Cells

Fu, Yen−Pei; Wen, Shaw‐Bing; Lu, C.

doi:10.1111/j.1551-2916.2007.01923.x

Cited by 122 publications

(24 citation statements)

References 21 publications

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“…materials after SDC was mixed with STO, substantiating that remarkable ionic conductivity can arise in an SDC/STO system not merely in planar but also in bulk-heterostructure. The ionic conductivity of 4SDC-6STO was superior to a series of well-known O 2conducting electrolytes (SDC ~0.01 S cm −1 at 550 °C, ceramic YSZ 0.13 S cm −1 at 1000 °C, GDC/YSZ mixture film ~0.1 S cm −1 at 1000 °C, and thin-film YSZ 0.005 S cm −1 at 500 °C) [28][29][30][31][32][33]. According to previous reports with respect to YSZ/STO and our HR-TEM inspection for the hetero-interfaces, the extraordinarily high ionic conductivity is very likely a result of the increased oxygen vacancies at the grain-interface between the two dissimilar structures of fluorite and perovskite.…”

Section: Ionic Conductivity and Ac Impedance Analysismentioning

confidence: 90%

A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells

et al. 2021

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Since colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite, heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells (SOFCs). However, so far, the practical uses of such promising material have failed to materialize in SOFCs due to the short circuit risk caused by SrTiO3. In this study, a series of fluorite/perovskite heterostructures made of Sm-doped CeO2 and SrTiO3 (SDC–STO) are developed in a new bulk-heterostructure form and evaluated as electrolytes. The prepared cells exhibit a peak power density of 892 mW cm−2 along with open circuit voltage of 1.1 V at 550 °C for the optimal composition of 4SDC–6STO. Further electrical studies reveal a high ionic conductivity of 0.05–0.14 S cm−1 at 450–550 °C, which shows remarkable enhancement compared to that of simplex SDC. Via AC impedance analysis, it has been shown that the small grain-boundary and electrode polarization resistances play the major roles in resulting in the superior performance. Furthermore, a Schottky junction effect is proposed by considering the work functions and electronic affinities to interpret the avoidance of short circuit in the SDC–STO cell. Our findings thus indicate a new insight to design electrolytes for low-temperature SOFCs.

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Section: Ionic Conductivity and Ac Impedance Analysismentioning

confidence: 90%

A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells

et al. 2021

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“…2 shows the procedure of preparation for the single cell specimen, which consists of three SOFC elements, namely anode, electrolyte and cathode materials. The synthesis methods for the cathodes and electrolytes are described in previously published papers [11,26]. The SBSC cathode powder was prepared using a solid-state reaction technique.…”

Section: Materials and Methods For Preparing And Testing Specimensmentioning

confidence: 99%

“…In the next process, the co-precipitation powder was heated at 600 °C and held in the air for 2 h. For a binding agent, a small amount of polyvinyl alcohol (PVA) with a purity grade of 96 % was mixed into the SDC powder and then pelletized to dimensions of 1.5 cm in diameter and 0.1 cm in thickness using uniaxial pressure applied at 1,000 kg f/cm 2 . The disk-shaped sample was heated at 1,500 °C and held for 5 h, followed by cooling to room temperature [26]. The procedure stages of fabricating a single cell specimen are presented in Fig.…”

Section: Materials and Methods For Preparing And Testing Specimensmentioning

confidence: 99%

An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

Subardi

Susanto

Kartikasari

et al. 2021

EEJET

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The main obstacle to solid oxide fuel cells (SOFCs) implementation is the high operating temperature in the range of 800–1,000 °C so that it has an impact on high costs. SOFCs work at high temperatures causing rapid breakdown between layers (anode, electrolyte, and cathode) because they have different thermal expansion. The study focused on reducing the operating temperature in the medium temperature range. SmBa0.5Sr0.5Co2O5+δ (SBSC) oxide was studied as a cathode material for IT-SOFCs based on Ce0.8Sm0.2O1.9 (SDC) electrolyte. The SBSC powder was prepared using the solid-state reaction method with repeated ball-milling and calcining. Alumina grinding balls are used because they have a high hardness to crush and smooth the powder of SOFC material. The specimens were then tested as cathode material for SOFC at intermediate temperature (600–800 °C) using X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), electrochemical, and scanning electron microscopy (SEM) tests. The X-ray powder diffraction (XRD) pattern of SBSC powder can be indexed to a tetragonal space group (P4/mmm). The overall change in mass of the SBSC powder is 8 % at a temperature range of 125–800 °C. A sample of SBSC powder showed a high oxygen content (5+δ) that reached 5.92 and 5.41 at temperatures of 200 °C and 800 °C, respectively. High diffusion levels and increased surface activity of oxygen reduction reactions (ORRs) can be affected by high oxygen content (5+δ). The polarization resistance (Rp) of samples sintered at 1000 °C is 4.02 Ωcm2 at 600 °C, 1.04 Ωcm2 at 700 °C, and 0.42 Ωcm2 at 800 °C. The power density of the SBSC cathode is 336.1, 387.3, and 357.4 mW/cm2 at temperatures of 625 °C, 650 °C, and 675 °C, respectively. The SBSC demonstrates as a prospective cathode material for IT-SOFC

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“…Metal, ceramics or their composites are widely used for the construction of these components. Different criteria are required for each material in order to operate in multiple capacities [4][5][6][7][8][9][10][11][12][14][15][16][17][18][19][34][35][36]. Different materials used in different SOFC components along with their requirements are discussed below.…”

Section: Methodsmentioning

confidence: 99%

A Brief Description of High Temperature Solid Oxide Fuel Cell’s Operation, Materials, Design, Fabrication Technologies and Performance

et al. 2016

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Today's world needs highly efficient systems that can fulfill the growing demand for energy. One of the promising solutions is the fuel cell. Solid oxide fuel cell (SOFC) is considered by many developed countries as an alternative solution of energy in near future. A lot of efforts have been made during last decade to make it commercial by reducing its cost and increasing its durability. Different materials, designs and fabrication technologies have been developed and tested to make it more cost effective and stable. This article is focused on the advancements made in the field of high temperature SOFC. High temperature SOFC does not need any precious catalyst for its operation, unlike in other types of fuel cell. Different conventional and innovative materials have been discussed along with properties and effects on the performance of SOFC's components (electrolyte anode, cathode, interconnect and sealing materials). Advancements made in the field of cell and stack design are also explored along with hurdles coming in their fabrication and performance. This article also gives an overview of methods required for the fabrication of different components of SOFC. The flexibility of SOFC in terms fuel has also been discussed. Performance of the SOFC with varying combination of electrolyte, anode, cathode and fuel is also described in this article.

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Preparation and Characterization of Samaria‐Doped Ceria Electrolyte Materials for Solid Oxide Fuel Cells

Cited by 122 publications

References 21 publications

A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells

A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells

An analysis of SmBa0.5Sr0.5Co2O5+δ double perovskite oxide for intermediate–temperature solid oxide fuel cells

A Brief Description of High Temperature Solid Oxide Fuel Cell’s Operation, Materials, Design, Fabrication Technologies and Performance

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