Solid Oxide Fuel Cells

Fergus, Jeffrey W.

doi:10.1002/9783527639496.ch14

Cited by 10 publications

(14 citation statements)

References 108 publications

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“…Hibino (10) found that BCY conductivity was higher than of YSZ for temperatures below about 650°C, but that YSZ conductivity was higher than BCY for temperatures above 650°C. Activation energies for the 25% Y-doped composition range from 0.41 eV (400-500°C) to 0.53 eV (550-800°C), much lower than that of YSZ (0.91∼1.10 eV) (11).…”

Section: Introductionmentioning

confidence: 84%

A Preliminary Study on Bi-Layered Ceramic Electrolytes of Mixed Conductor and Proton Conductor

Zhang

Robertson²,

Decès-Petit³

2017

ECS Trans.

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In this contribution, we present an experimental study of singlelayered electrolyte with mixed ion and electron conducting ceramic material SDC (Sm 0.2 Ce 0.8 O 2-x ) and bi-layered electrolyte of the SDC layer with proton conducting ceramic material BCY (BaCe 0.9 Y 0.1 O 3-x ) to enhance the electrolyte performance. Anode supported cell structure was adopted and the button cells were fabricated through conventional tape casting, screen printing and high temperature sintering processes. It was found that the open circuit voltages of the bi-layered electrolyte cells were higher than that of single-layered SDC electrolyte cells. The bi-layered cells showed a decent performance in the temperature range of 500-650°C. Interaction between the two electrolyte materials occurred at high sintering temperature, which led to an increase in electrolyte resistance as well as electrode polarization values.

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Section: Introductionmentioning

confidence: 84%

A Preliminary Study on Bi-Layered Ceramic Electrolytes of Mixed Conductor and Proton Conductor

Zhang

Robertson²,

Decès-Petit³

2017

ECS Trans.

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“…The SOFC is assumed to be of tubular-type, as shown in Figure 3 [28][29][30], with a total number of 1.200 equally behaving cells. Note that other geometries are also possible, such as planar designs, which have specific advantages and drawbacks compared to the tubular design [31,32].…”

Section: Principal System Operation and Designmentioning

confidence: 99%

Start-Up of a Solid Oxide Fuel Cell System with a View to Materials Science-Related Aspects, Control and Thermo-Mechanical Stresses

Colombo

Хартон

2021

Crystals

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The start-up of a solid oxide fuel cell (SOFC) is investigated by means of numerical simulation with a view to material and operational constraints on a component and system level, as well as thermo-mechanical stresses. The applied multi-physics modeling approach couples thermal-, electrochemical, chemical-, and thermo-mechanical phenomena. In addition to constraints, emphasis is given to degrees of freedom with respect to manipulated and controlled variables of the system. Proper ramping during the start-up procedure keeps critical parameter values within a safe regime. Of particular interest are gradient in terms of temperature and chemical concentrations. Nevertheless, simulations show that thermo-mechanical stresses are relatively high during the initial start-up phase, the system is, thus, more susceptible to failure. The combination of multi-physics modeling in conjunction with practical control aspects for start-up of an SOFC, which is presented in this paper, is important for applications.

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“…The ability of oxides to endure extreme mechanical, chemical, and thermal conditions has been intriguing for researchers from a broad range of disciplines, e.g., earth science, nuclear engineering, space technology, and dental care . Subtle electro‐chemo‐mechanical balance at complex‐oxide surfaces and interfaces allows the formation of phases with structural and functional characteristics that differ from the bulk .…”

Section: Introductionmentioning

confidence: 99%

Epitaxial TiO_x Surface in Ferroelectric BaTiO₃: Native Structure and Dynamic Patterning at the Atomic Scale

Barzilay

Qiu

Rappe

et al. 2019

Adv Funct Materials

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Surfaces and interfaces of ferroelectric oxides exhibit enhanced functionality, and therefore serve as a platform for novel nano and quantum technologies. Experimental and theoretical challenges associated with examining the subtle electro-chemo-mechanical balance at metal-oxide surfaces have hindered the understanding and control of their structure and behavior. Here, combined are advanced electron-microscopy and firstprinciples thermodynamics methods to reveal the atomic-scale chemical and crystallographic structure of the surface of the seminal ferroelectric BaTiO 3 . It is shown that the surface is composed of a native <2 nm thick TiO x rock-salt layer in epitaxial registry with the BaTiO 3 . Using electronbeam irradiation, artificial TiO x sites with sub-nanometer resolution are successfully patterned, by inducing Ba escape. Therefore, this work offers electro-chemo-mechanical insights into ferroelectric surface behavior in addition to a method for scalable high-resolution beam-induced chemical lithography for selectively driving surface phase transitions, and thereby functionalizing metal-oxide surfaces.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10. 1002/adfm.201902549. in oxidation states of the participating ions. Hence, functional-oxide surfaces and interfaces constitute a rich platform for novel phases that are attractive for high-performance miniaturized electronic devices [7,8] as well as for chemical catalyses. [9] Because ferroelectric oxides comprise regions with varying crystallographic and electric polarization orientations, there has been a growing interest in their outer surface and domain wall functionality, which is expressed as enhanced conductivity, [10][11][12] magnetism, [4] and even superconductivity. [13] The chemical origin of such a functional behavior is typically attributed to either oxygen vacancy dynamics [14][15][16][17] or cation segregation, [18] while other studies look at the effects of intrinsic symmetry breaking. [4] Despite the accumulated knowledge on domain walls, the structure and behavior of ferroelectric surfaces, which are responsible for domain stabilization and are attractive for, e.g., nano lithography [19][20][21][22][23] and catalysis, [9,[24][25][26][27] have remained elusive. Specifically, the longstanding challenge in understanding how the surface mediates between the absence of electric and mechanical fields in the vacuum and the polarization, and strain in the bulk is not merely experimental or theoretical, but even conceptual. [28] Hence, computational methods that were developed to explain the electro-chemical [29] and electro-mechanical [30] atomic-scale interactions in ferroelectrics have been adopted to describe experimental observations of the surface behavior. For example, Tsurumi et al. [31,32] combined dielectric measurements and density functional theory (DFT) calculations to demonstrate that nanoparticles (NPs) of the seminal nontoxic ferroelectric, BaTiO 3 , organize in a core-shell...

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Solid Oxide Fuel Cells

Cited by 10 publications

References 108 publications

A Preliminary Study on Bi-Layered Ceramic Electrolytes of Mixed Conductor and Proton Conductor

A Preliminary Study on Bi-Layered Ceramic Electrolytes of Mixed Conductor and Proton Conductor

Start-Up of a Solid Oxide Fuel Cell System with a View to Materials Science-Related Aspects, Control and Thermo-Mechanical Stresses

Epitaxial TiO_x Surface in Ferroelectric BaTiO₃: Native Structure and Dynamic Patterning at the Atomic Scale

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Solid Oxide Fuel Cells

Cited by 10 publications

References 108 publications

A Preliminary Study on Bi-Layered Ceramic Electrolytes of Mixed Conductor and Proton Conductor

A Preliminary Study on Bi-Layered Ceramic Electrolytes of Mixed Conductor and Proton Conductor

Start-Up of a Solid Oxide Fuel Cell System with a View to Materials Science-Related Aspects, Control and Thermo-Mechanical Stresses

Epitaxial TiOx Surface in Ferroelectric BaTiO3: Native Structure and Dynamic Patterning at the Atomic Scale

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Epitaxial TiO_x Surface in Ferroelectric BaTiO₃: Native Structure and Dynamic Patterning at the Atomic Scale