Review on zirconate-cerate-based electrolytes for proton-conducting solid oxide fuel cell

Rashid, Nur Lina Rashidah Mohd; Osman, Nafisah; Jais, Abdul Azim; Somalu, Mahendra Rao; Muchtar, Andanastuti; Baharuddin, Nurul Akidah; Isahak, Wan Nor Roslam Wan

doi:10.1016/j.ceramint.2019.01.045

Cited by 143 publications

(52 citation statements)

References 163 publications

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“…The system of conductivity, the stability of chemical and sinterability of cerate and/or zirconate electrolytes are discussed and proved this alternative electrolyte has a high potential for SOFCs application. 36 Recent advances in the understanding of the evolution of surfaces and interfaces in solid oxide cells This review discussed the critical processes of redox reaction for SOFCs application, which is important in order to improve the performance of cells. The applications of surface sensitive technique are reviewed to understand the dislocations and grain boundary of surfaces and interfaces of each SOFCs component in this charge transfer process.…”

Section: Titlementioning

confidence: 99%

“…Besides, the high-cost maintenance and management system of SOFCs including the complex fabrication of cell and stack, safety issues to handling the fuel and oxidant, and high-temperature operation. 36 Recent advances in the understanding of the evolution of surfaces and interfaces in solid oxide cells 44,45 The solid electrolyte is a critical component to be considered for any development of SOFCs application because the performance and the operating temperature of the overall cells are depending on the material of solid electrolytes.…”

Section: Introductionmentioning

confidence: 99%

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A review on recent status and challenges of yttria stabilized zirconia modification to lowering the temperature of solid oxide fuel cells operation

et al. 2019

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Solid Oxide Fuel Cells (SOFCs) are an electrochemical energy converter that receives the world's attention as a power generation system of the future owing to its flexibility to consume various types of fuels, low emission of greenhouses gases, and having high efficiency reaching over 70%. A conventional SOFCs operates at high temperature, typically ranges between 800 to 1000°C. SOFCs use yttria-stabilized zirconia (YSZ) as the electrolyte, which exhibits excellent oxide ion conductivity in this temperature range. However, this temperature range poses an issue to SOFCs durability, as it leads to the degradation of the cell components. In addition, SOFCs application is limited and difficult to implement for the transportation sector and portable appliance. A viable solution is to lower the SOFCs operating temperature to intermediate (600 to 800°C ) or low (<600°C) operating temperature. The benefit of this way, cell durability will improve, as well as other advantages such as facilitates handling, assembling, dismantling, cost reduction, and expanded the SOFCs application. Nonetheless, the key challenge for the issue is finding suitable electrolyte, as YSZ have lower ionic conductivity at low and intermediate temperature range. The aim of this paper is to review the status and challenges in the attempts made to modify YSZ electrolyte within the past decade. The resulting ionic conductivity, microstructure, and densification, mechanical and thermal properties of these 'new' electrolytes critically reviewed. The targeted conductivity of modification of YSZ electrolyte must be exceeded >0.1 S cm -1 to enable high performance of SOFCs power generation systems to be realized for transportation and portable applications. Based on our knowledge, this paper is the first review which focused on the recent status and challenges of YSZ electrolyte towards lowering the operating temperature.

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Section: Titlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review on recent status and challenges of yttria stabilized zirconia modification to lowering the temperature of solid oxide fuel cells operation

et al. 2019

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“…Proton-conducting oxide (PCO) materials occupy a special place in the high-temperature electrochemistry due to its unique features consisting in proton transportation in an oxide matrix [1][2][3][4][5]. These features allows PCOs to be utilized as electrolytes for various types of electrochemical devices (EDs) such as solid oxide fuel cells (SOFCs), solid oxide electrolysis cells (SOECs), pumps and sensors [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…In order to further improve the EDs' performance and efficiency, different strategies aimed at the electrolyte modifications can be exploited [1][2][3][12][13][14]: the decrease of their thickness, designing the structures with a higher ionic mobility, purposeful modification of ceramics morphology. The latter is a highly promising strategy, since the overall conductivity of polycrystalline PCOs is known to be determined by a high resistance of grain boundaries [14].…”

Section: Introductionmentioning

confidence: 99%

Manipulating the grain boundary properties of BaCeO₃-based ceramic materials through sintering additives introduction

et al. 2019

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BaCeO 3 -based materials represent a well-known family of proton-conducting electrolytes, which can be used in different solid oxide electrochemical devices. An effective operation of the latter across an intermediate-temperature range requires improved transport of PCEs, including their grain (G) and grain boundary (GB) components. In the present work, some 3d-elements in a small amount were used as sintering additives to verify the possibility of improving the GB conductivity of BaCe 0.9 Gd 0.1 O 3-δ . It is shown that copper oxide (CuO) can be considered as one of the most effective sintering agents, since its use enables decreasing the GB density of the BCG ceramic material at the reduced sintering temperatures. The obtained results form a new tactic for designing new protonic electrolytes, whose conductivity might be prevail over ones containing Ni-based modifiers.

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“…Electrolyte and electrodes are the essential component of a solid oxide fuel cell. Even if anionic, protonic [11,12] and dual-membrane cells [13] are reported, the first are the most studied in the literature. The state of the art material for the electrolyte is fluorite-structured yttria-stabilized zirconia (YSZ) because of its wide range of stability in oxidizing and reducing media [14], although doped ceria [15] and perovskite Sr-and Mg-incorporated lanthanum gallate (LSGM) are considered as alternatives for intermediate operative temperatures.…”

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confidence: 99%

Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties

et al. 2019

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Perovskite anodes, nowadays, are used in any solid oxide fuel cell (SOFC) instead of conventional nickel/yttria-stabilized zirconia (Ni/YSZ) anodes due to their better redox and electrochemical stability. A few compositions of samarium-substituted strontium titanate perovskite, Sm x Sr 1−x TiO 3−δ (x = 0.00, 0.05, 0.10, 0.15, and 0.20), were synthesized via the citrate-nitrate auto-combustion route. The XRD patterns of these compositions confirm that the solid solubility limit of Sm in SrTiO 3 is x < 0.15. The X-ray Rietveld refinement for all samples indicated the perovskite cubic structure with a Pm3m space group at room temperature. The EDX mapping of the field emission scanning electron microscope (FESEM) micrographs of all compositions depicted a lower oxygen content in the specimens respect to the nominal value. This lower oxygen content in the samples were also confirmed via XPS study. The grain sizes of Sm x Sr 1−x TiO 3 samples were found to increase up to x = 0.10 and it decreases for the composition with x > 0.10. The AC conductivity spectra were fitted by Jonscher's power law in the temperature range of 500-700 • C and scaled with the help of the Ghosh and Summerfield scaling model taking ν H and σ dc T as the scaling parameters. The scaling behaviour of the samples showed that the conduction mechanism depends on temperature at higher frequencies. Further, a study of the conduction mechanism unveiled that small polaron hopping occurred with the formation of electrons. The electrical conductivity, in the H 2 atmosphere, of the Sm 0.10 Sr 0.90 TiO 3 sample was found to be 2.7 × 10 −1 S·cm −1 at 650 • C, which is the highest among the other compositions. Hence, the composition Sm 0.10 Sr 0.90 TiO 3 can be considered as a promising material for the application as the anode in SOFCs.Energies 2019, 12, 4042 2 of 16 SOEC technology [1][2][3][4][5][6][7][8]. SOFCs are more efficient in comparison to a conventional power plant and lower temperature polymer-based fuel cells [9,10]. Electrolyte and electrodes are the essential component of a solid oxide fuel cell. Even if anionic, protonic [11,12] and dual-membrane cells [13] are reported, the first are the most studied in the literature. The state of the art material for the electrolyte is fluorite-structured yttria-stabilized zirconia (YSZ) because of its wide range of stability in oxidizing and reducing media [14], although doped ceria [15] and perovskite Sr-and Mg-incorporated lanthanum gallate (LSGM) are considered as alternatives for intermediate operative temperatures. Lanthanum strontium manganite (LSM)-YSZ composite and Sr-and Fe-doped lanthanum cobaltite (LSCF) are extensively used for cathodes, while Ni-based cermets are conventionally used as anode materials for SOFCs [16,17], although this Ni-based cermet anode material should demonstrate volume instability upon redox cycling and low-tolerance to carbon deposition when exposed to hydrogen [18]. Therefore, nickel-free, alternate-structured anode materials are essential to overcome these issues. Recen...

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Review on zirconate-cerate-based electrolytes for proton-conducting solid oxide fuel cell

Cited by 143 publications

References 163 publications

A review on recent status and challenges of yttria stabilized zirconia modification to lowering the temperature of solid oxide fuel cells operation

A review on recent status and challenges of yttria stabilized zirconia modification to lowering the temperature of solid oxide fuel cells operation

Manipulating the grain boundary properties of BaCeO₃-based ceramic materials through sintering additives introduction

Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties

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Review on zirconate-cerate-based electrolytes for proton-conducting solid oxide fuel cell

Cited by 143 publications

References 163 publications

A review on recent status and challenges of yttria stabilized zirconia modification to lowering the temperature of solid oxide fuel cells operation

A review on recent status and challenges of yttria stabilized zirconia modification to lowering the temperature of solid oxide fuel cells operation

Manipulating the grain boundary properties of BaCeO3-based ceramic materials through sintering additives introduction

Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties

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Manipulating the grain boundary properties of BaCeO₃-based ceramic materials through sintering additives introduction