Structure, densification and electrical properties of Gd3+ and Cu2+ co-doped ceria solid electrolytes for SOFC applications: Effects of Gd2O3 content

Santos, Thamyscira H.; Grilo, João P.F.; Loureiro, Francisco J.A.; Fagg, Duncan P.; Fonseca, Fábio C.; Macedo, Daniel A.

doi:10.1016/j.ceramint.2017.11.009

Cited by 70 publications

(33 citation statements)

References 24 publications

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“…To solve the problem of the high operating temperature of SOFCs application is by introducing the solid electrolyte with high conductivity in low-to-intermediate operating temperature. 48,49 One of the solutions to enhance the YSZ electrolyte conductivity for the SOFCs operating temperature at low-to-intermediate temperature is reducing the thickness of YSZ electrolyte from 100 μm to 10 μm providing the minimal ohmic resistance, which will make the diffusion of ion oxides or proton easier through the YSZ electrolyte.. 50,51 Besides, the strategy by using the bilayer electrolyte design based on YSZ electrolyte or introducing an alternative oxide ion conductor to YSZ electrolyte will also prepare an excellent conductivity property at low-to-intermediate temperature and reliable to operate the SOFCs system below than 800°C. 52,53 Hence, it will expand the potential of the application of SOFCs to be implemented in the portable application and transportation sector.…”

Section: Development Of Lanthanum Strontium Cobalt Ferrite Perovskitementioning

confidence: 99%

“…48,49 One of the solutions to enhance the YSZ electrolyte conductivity for the SOFCs operating temperature at low-to-intermediate temperature is reducing the thickness of YSZ electrolyte from 100 μm to 10 μm providing the minimal ohmic resistance, which will make the diffusion of ion oxides or proton easier through the YSZ electrolyte.. 50,51 Besides, the strategy by using the bilayer electrolyte design based on YSZ electrolyte or introducing an alternative oxide ion conductor to YSZ electrolyte will also prepare an excellent conductivity property at low-to-intermediate temperature and reliable to operate the SOFCs system below than 800°C. The operating condition, conductivity, resistance, and structure are discussed based on categories of SOFCs.…”

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: Development Of Lanthanum Strontium Cobalt Ferrite Perovskitementioning

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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“…SOFC systems with pre-or internal reforming can work with common fuels in the actual infrastructure and also work in a future hydrogen network [6][7][8]. Depending on the electrolyte material and thickness, SOFCs are operated at a temperature between 700 • C and 1100 • C [9,10].…”

Section: Introductionmentioning

confidence: 99%

Impact of Multi-Causal Transport Mechanisms in an Electrolyte Supported Planar SOFC with (ZrO2)x−1(Y2O3)x Electrolyte

Huerta¹,

Flasbart²,

Marquardt³

et al. 2018

Entropy

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The calculation of the entropy production rate within an operational high temperature solid oxide fuel cell (SOFC) is necessary to design and improve heating and cooling strategies. However, due to a lack of information, most of the studies are limited to empirical relations, which are not in line with the more general approach given by non-equilibrium thermodynamics (NET). The SOFC 1D-model presented in this study is based on non-equilibrium thermodynamics and we parameterize it with experimental data and data from molecular dynamics (MD). The validation of the model shows that it can effectively describe the behavior of a SOFC at 1300 K. Moreover, we show that the highest entropy production is present in the electrolyte and the catalyst layers, and that the Peltier heat transfer is considerable for the calculation of the heat flux in the electrolyte and cannot be neglected. To our knowledge, this is the first validated model of a SOFC based on non-equilibrium thermodynamics and this study can be extended to analyze SOFCs with other solid oxide electrolytes, with perovskites electrolytes or even other electrochemical systems like solid oxide electrolysis cells (SOECs).

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“…Many efforts have been made for improvement of its ionic conductivity. The effects of dopant concentration [1][2][3][4], grain size [5,6], synthesis [7,8] and processing [9,10] on electrical properties have been comprehensively studied. However, the vast majority of recent works dealing with electrical properties of GDC ceramics still encountered a pretty low total conductivity due to a high resistivity of grain boundaries [9,[11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of charge carrier relaxation in grain boundary of gadolinium-doped ceria ceramics

Kazlauskas¹,

Kazakevičius²,

Žalga³

et al. 2019

physics

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Two different gadolinium-doped ceria ceramics are prepared from two different powders, one commercially available synthesised by solid state reaction and another produced by tartaric acid assisted sol–gel synthesis. The specimens have a different microstructure, while the XRD patterns of powders showed a pure cubic fluorite structure without any impurity phase. The electrical properties are studied at frequencies up to 10 GHz by combining broadband 2-electrode and 4-electrode impedance spectroscopy methods. Primary electrical measurements showed that the values of grain conductivity and its activation energies for both ceramics were nearly the same. However, due to different contributions of the grain boundary mediums, total conductivities and their activation energies are found to be considerably different. The advantage of the 4-electrode method allowed us to measure the pure electrical response of grain boundaries, bypassing any interferences caused by interfacial impedance. By using these data, the temperature behaviour of distribution of relaxation times in the grain boundary is studied. A broadening of this distribution with increasing temperature is found for both specimens, contrary to a previously observed phenomenon in the grain of oxygen ion conductive ceramics and single crystals. It is shown that, supposing individual relaxation times behave according to the Arrhenius law, both activation energy and pre-exponential factor must be distributed.

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Structure, densification and electrical properties of Gd3+ and Cu2+ co-doped ceria solid electrolytes for SOFC applications: Effects of Gd2O3 content

Cited by 70 publications

References 24 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

Impact of Multi-Causal Transport Mechanisms in an Electrolyte Supported Planar SOFC with (ZrO2)x−1(Y2O3)x Electrolyte

Peculiarities of charge carrier relaxation in grain boundary of gadolinium-doped ceria ceramics

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