Fabrication and characterization of anode supported YSZ/GDC bilayer electrolyte SOFC using dry press process

Choi, Hoon; Cho, Gu Young; Cha, Sungdeok

doi:10.1007/s40684-014-0013-4

Cited by 46 publications

(20 citation statements)

References 23 publications

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“…In this study, The power density was also increased from 337 to 1,000 mW cm À2 at 600 C with the insertion of YSZ blocking layers. Due to the improved performance of SOFC, GDC/YSZ bi-layer electrolyte has also been investigated by the other researchers [189][190][191][192].…”

Section: Gadolinia-doped Ceriamentioning

confidence: 99%

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

Nandasiri

Thevuthasan

2015

Thin Film Structures in Energy Applications

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State-of-the-art solid oxide fuel cells (SOFC) are among the main candidates for clean energy technology due to their high efficiency, fuel flexibility, low air pollution, and minimal greenhouse gas emission. However, high operational temperature of SOFC is a greater challenge in commercialization of these devices for low cost and portable applications. High temperature operation of SOFC degrades its performance with aging, limits the selection of materials for fuel cell components, and increases the fabrication cost. Thus, there have been enormous efforts to improve the properties of existing materials and develop new materials for SOFC components in order to lower the operating temperature of SOFC. Recent advances in thin film technology have also been utilized to develop new materials with improved properties for SOFC. One of the key components in SOFC is the electrolyte and several research groups are working on developing new electrolyte materials. In this chapter, we will discuss the recent advances in thin film SOFC electrolytes. This extensive discussion includes the evolution of doped ceria, doped zirconia, and multilayer hetero-structured thin film electrolytes. The newly developed nanoscale thin films and multilayer hetero-structures with improved oxygen ionic conductivity will have significant impact on SOFC devices. Introduction Background of Solid Oxide Fuel Cells (SOFC)The latest U.S. energy reviews revealed that more than 80 % of the energy consumed in the world is still produced by non-renewable energy sources such as petroleum, natural gas, and coal [1]. Moreover, it is projected that world energy consumption will grow by 56 % from 2010 to 2040. Therefore, from a long-term energy perspective, clean energy technologies are needed to utilize primary energy

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Section: Gadolinia-doped Ceriamentioning

confidence: 99%

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

Nandasiri

Thevuthasan

2015

Thin Film Structures in Energy Applications

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“…Nickel oxide (NiO) is extensively used as a principal anode material because of its chemical stability, high electrical conductivity and high efficiency for both hydrogen oxidation and hydrocarbon fuel reformation [4][5][6]. Generally, NiO is partially mixed with electrolyte powders, such as yttria-stabilized zirconia (YSZ), scandia-stabilized zirconia (ScSZ), samariumdoped ceria (SDC) and gadolinium-doped ceria (GDC), to form composite anodes of NiO-YSZ [7,8], NiO-ScSZ [9,10], NiO-GDC [11,12], NiO-CGO [5,13] and NiO-SDC [6,14], respectively. Reduction is an important process performed prior to the evaluation of the electrical performance of the anode substrate.…”

Section: Introductionmentioning

confidence: 99%

Processing of composites based on NiO, samarium-doped ceria and carbonates (NiO-SDCC) as anode support for solid oxide fuel cells

Siong

Muchtar

Somalu

et al. 2017

PAC

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NiO-SDCC composites consisting of NiO mixed with Sm-doped ceria (SDC) and carbonates (Li 2 CO 3 and Na 2 CO 3) were sintered at different temperatures and reduced at 550°C. The influence of reduction on structure of the NiO-SDCC anode support for solid oxide fuel cells (SOFCs) was investigated. Raman spectra of the NiO-SDCC samples sintered at 500, 600 and 700°C showed that after reducing at 550°C NiO was reduced to Ni. In addition, SDC and carbonates (Li 2 CO 3 and Na 2 CO 3) did not undergo chemical transformation after reduction and were still detected in the samples. However, no Raman modes of carbonates were identified in the NiO-SDCC pellet sintered at 1000°C and reduced at 550°C. It is suspected that carbonates were decomposed at high sintering temperature and eliminated due to the reaction between the CO 3 2and hydrogen ions during reduction in humidified gases at 550°C. The carbonate decomposition increased porosity in the Ni-SDCC pellets and consequently caused formation of brittle and fragile structure unappropriated for SOFC application. Because of that composite NiO-SDC samples without carbonates were also analysed to determine the factors affecting the crack formation. In addition, it was shown that the different reduction temperatures also influenced the microstructure and porosity of the pellets. Thus, it was observed that Ni-SDC pellet reduced at 800°C has higher electrical conductivity of well-connected microstructures and sufficient porosity than the pellet reduced at 550°C.

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“…8 Since ceramics poorly interact with metals, agglomeration easily occurs when a metal is deposited on ceramic material such as yttria-stabilized zirconia (YSZ). [10][11][12] The occurrence of agglomeration is also related to the various following theories: surface diffusion, surface energy anisotropies, fingering instabilities, Ostwald ripening, hole pattern, and hillock formation. 8,13 In fact, nanoparticles that enlarge the surface area of catalysts are extremely susceptible to coalescence, and may agglomerate into coarse clusters more than several times larger than nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultra-thin SnO2 coating on Pt catalyst for energy applications

Chang

Kim

Lee

et al. 2016

Int. J. Precis. Eng. Manuf.

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In this paper, we present a simple and novel approach for stabilizing a porous metal-based nanostructure through atomic layer deposition in which ultra-thin tin oxide (SnO 2 ) coats platinum (Pt) film. After heating the ultra-thin tin oxide-coated Pt samples at 300 o C and 500 o C and observing the in situ sheet resistance variations of Pt for 20 hours, we found that the ultra-thin tin oxide coating suppresses metal agglomeration. The thermal stability of ultra-thin tin oxide-coated Pt was greater than that of pure Pt, even at 300 o C and 500 o C. More interestingly, the ultra-thin tin oxide coating was found to maintain the morphology of its underlying porous Pt at test temperatures of 300 o C and 500 o C.

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Fabrication and characterization of anode supported YSZ/GDC bilayer electrolyte SOFC using dry press process

Cited by 46 publications

References 23 publications

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

Processing of composites based on NiO, samarium-doped ceria and carbonates (NiO-SDCC) as anode support for solid oxide fuel cells

Effect of ultra-thin SnO2 coating on Pt catalyst for energy applications

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