Preface

Minh, Nguyễn Quang; Takahashi, Takehiko

doi:10.1016/b978-044489568-4/50001-3

Cited by 126 publications

(215 citation statements)

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“…This has also been confirmed for microcrystalline materials in a recent work of Tschöpe et al [31] In addition, the electronic conductivity of heavily doped ceria ceramics is negligible at atmospheric pressure, especially at the low temperatures considered in this work. [14,32] Therefore, the overall conductivity determined by EIS is expected to be only due to the oxide-ion conductivity. In order to confirm this hypothesis and clearly establish that the effect observed in this work is only due to an enhancement in the ionic conductivity, EIS spectra have been measured in synthetic air (p(O 2 ) = 0.21 atm; 1 atm = 1.01325 × 10 5 Pa) and high-purity Ar (p(O 2 ) = 10 -6 atm) for the nanostructured CYO and CSO samples (fired at 700 and 800°C).…”

Section: Full Papermentioning

confidence: 99%

“…These materials exhibit electronic conductivity in a reducing atmosphere, but this effect is negligible at temperatures lower than 600°C, so they can operate efficiently at intermediate temperatures. [14] The transport properties of ceria-based solid electrolytes have been investigated by several authors. Particularly, in the last decade, the influence of the microstructure and impurities on the grain-boundary (intergrain) ionic conductivity has been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Ionic Conductivity in Nanostructured, Heavily Doped Ceria Ceramics

Bellino

Lamas

Reca

2005

Adv Funct Materials

214

130

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The electrical properties of nanostructured, heavily yttria‐ or samaria‐doped ceria ceramics are studied as a function of grain size using electrochemical impedance spectroscopy (EIS). A remarkable enhancement in the total ionic conductivity of about one order of magnitude is found in nanostructured samples, compared with the intrinsic bulk conductivity of conventional microcrystalline ceramics. This effect is attributed to the predominance of grain‐boundary conduction in the nanostructured materials, coupled with an increase in the grain‐boundary ionic diffusivity with decreasing grain size.

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Section: Full Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Ionic Conductivity in Nanostructured, Heavily Doped Ceria Ceramics

Bellino

Lamas

Reca

2005

Adv Funct Materials

214

130

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“…In the last 10 years, rapid progress has been made in materials and stack development in solid oxide fuel cells (SOFCs) which has made it possible to construct and operate SOFC stacks and to confirm their technological feasibility as an energy converter [1,2]. The first-generation of SOFC stacks examined are tubular ones developed by Siemens Westinghouse Power Company (SWPC) [3].…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Solid Oxide Fuel Cell Materials

Yokokawa¹,

et al. 2001

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Recent developments in solid oxide fuel cell (SOFC) materials and stacks have been reviewed mainly from the viewpoint of the materials chemistry associated with stack development. Firstly the general features of SOFCs are described to clarify the materials problems which need to be solved and the technology that needs to be developed. The main, characteristic features of conventional SOFC materials are described with the emphasis put on the materials problems associated with the respective materials. Then the materials problems associated with stack development are described for tubular stacks and for planar stacks with oxide interconnect and with metal interconnect. Finally, new materials, design and processing are discussed in relation to new applications of SOFCs. The emphasis is placed on the fact that these are new challenges and therefore a more fundamental strategy for materials and stack development should be constructed on the basis of the materials science and technology developed mainly for conventional materials.

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“…Operating temperature choices: In general, the conductivity requirement for the electrolyte determines the operating temperature of the RSOFC (SOFC/ SOEC) [11,12,15]. The operating temperature of the RSOFC thus can be varied/reduced (for YSZ based cells) by modifying the electrolyte material and/or electrolyte thickness (Figure 16.6).…”

Section: 22 Featuresmentioning

confidence: 99%

“…Since the SOEC is the SOFC operated in reverse mode and traditionally derived from the SOFC, the RSOFC being developed is typically based on the more technologically advanced SOFC. Thus, materials for the RSOFC are those commonly used in the SOFC, for example, for single cells, yttria stabilized zirconia (YSZ) for the electrolyte, perovskites (such as lanthanum strontium manganese oxide (LSM), lanthanum strontium cobalt iron oxide (LSCF)) for the oxygen electrode, and nickel-YSZ cermet for the hydrogen electrode and for stacks, conductive oxides (such as lanthanum strontium chromium perovskite (LSCr)) or stainless steels for the interconnect (depending on the operating temperature) (Table 16.1) [11][12][13]. Like the SOFC, the RSOFC operates in the temperature range 600-1000°C.…”

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confidence: 99%

Reversible Solid Oxide Fuel Cell Technology for Hydrogen/Syngas and Power Production

Minh¹

2016

Hydrogen Science and Engineering : Materials, Processes, Systems and Technology

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IntroductionWorld energy consumption is projected to grow by about 56% from 2010 to 2040 (from 524 quadrillion to 820 quadrillion British thermal units (Btu)) with consumption increases from all fuel sources (fossil, nuclear, and renewable) and fossil fuels expected to continue supply much of the energy used worldwide (almost 80%) [1]. As use of fossil fuels is projected to increase, world energyrelated CO 2 emissions will grow from 31 billion metric tons in 2010 to 45 billion metric tons in 2040, a 45% increase [1]. Thus, it is expected that future energy systems should be fuel-flexible (flexibility) (to facilitate integration with any type of energy sources) and environmentally compatible (compatibility) (to reduce CO 2 emissions). In addition, such systems should have the characteristics of capability (useful for different functions), adaptability (suitable for various applications and adaptable to local energy needs), and affordability (competitive in costs) (Figure 16.1). Reversible solid oxide fuel cells (RSOFCs), being developed for hydrogen/syngas production and power generation, potentially have all those desired characteristics and, therefore, can serve as a base technology for green, flexible, and cost-competitive future energy systems [2]. This chapter provides an overview of the RSOFC, discusses its hydrogen/syngas production and power generation operations, and reviews the status of the technology and its applications. Reversible Solid Oxide Fuel Cell Overview Operating PrinciplesA RSOFC is a device that can operate efficiently in both fuel cell mode for power generation and electrolysis mode for chemical production. Thus, in fuel cell

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Preface

Cited by 126 publications

References 0 publications

Enhanced Ionic Conductivity in Nanostructured, Heavily Doped Ceria Ceramics

Enhanced Ionic Conductivity in Nanostructured, Heavily Doped Ceria Ceramics

Recent Developments in Solid Oxide Fuel Cell Materials

Reversible Solid Oxide Fuel Cell Technology for Hydrogen/Syngas and Power Production

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