Thin porous Ni–YSZ films as anodes for a solid oxide fuel cell

Jou, Shyankay; Wu, Tzu-Hui

doi:10.1016/j.jpcs.2008.07.005

Cited by 32 publications

(22 citation statements)

References 64 publications

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“…1,10 To obtain nano-structured electrodes for thin electrolytes, most of thin film base SOFCs use single phase noble metal electrodes such as porous Pt fabricated by sputtering, 4,6,8,10,12 but the metal coarsening at operating temperatures eventually leads to serious problems such as the reduction of the triple phase boundary length and thus degradation of the cell performance. 10,12 Therefore, ceramic-metal composites (cermets) fabricated by thin film deposition methods 1,[13][14][15][16][17][18][19][20][21][22] were investigated actively to prevent the metal coarsening since the ceramic network in the nano-composite is expected to retain the excessive metal grain growth 6,23 as in conventional SOFCs. In some cases, desirable microstructures, such as a nano-porous structure and an interpenetrating nano-composite structure, 19,22 as well as promising electrochemical performances, such as lower overpotentials and electrode resistances, [20][21][22] were reported.…”

Section: Introductionmentioning

confidence: 99%

“…In some cases, desirable microstructures, such as a nano-porous structure and an interpenetrating nano-composite structure, 19,22 as well as promising electrochemical performances, such as lower overpotentials and electrode resistances, [20][21][22] were reported. However, in many cases, even more massive metal phase agglomeration was observed after the reduction or thermal treatments of the thin film composites regardless of the deposition methods, 1,13,[15][16][17][18] which leads to the loss of the connectivity and the poor high temperature stability of electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Suppression of Ni agglomeration in PLD fabricated Ni-YSZ composite for surface modification of SOFC anode

Noh

Son

Lee

et al. 2010

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suppression of Ni agglomeration in PLD fabricated Ni-YSZ composite for surface modification of SOFC anode

Noh

Son

Lee

et al. 2010

Journal of the European Ceramic Society

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“…The heating/cooling rate was 200 °C/h. Undesirable massive metal phase agglomeration was observed after the reduction or thermal treatments of the cermet composites in the form of the thin film regardless of the deposition methods [13]. Ni agglomeration leads to the loss of connectivity and poor high temperature stability of electrodes.…”

Section: Methodology and Materialsmentioning

confidence: 99%

Solid oxide fuel cell anode surface modification by magnetron sputtering of NiO/YSZ thin film

Solovyev

Шипилова

Ионов

et al. 2017

J. Phys.: Conf. Ser.

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IntroductionA ceramic-metal (cermet) composite of Ni and yttria-stabilized zirconia (YSZ) is the most common anode material of solid oxide fuel cells (SOFC) operating at a temperature of 800-1000 °C. However, the desire to create a commercial SOFC requires to mitigate the problem, associated with a high operating temperature. In turn, the lower operating temperature would increase polarization of electrodes and ohmic resistance of electrolyte. The ohmic resistance can be decreased either by using ultra-thin electrolytes, or new materials with higher ionic conductivity at lower temperatures [1,2]. Polarization losses of the anode can be reduced by creating new alternative materials or by nanostructuring commonly used 4]. The second approach seems to be the most promising for improving the SOFC characteristics. First, conventional NiO/YSZ cermet is cheaper than other materials, chemically stable in a reducing atmosphere at high temperatures and has thermal expansion coefficient close to that of YSZ electrolyte [5]. Second, it is known that the electrochemical reaction at the anode occurs at a three-phase boundary (TPB), the area of contact between the metal, the electrolyte and the working gas. Therefore, the electrode reaction rate and, hence, its efficiency is determined by the TPB length. The formation of nanoporous anode structure will significantly increase the TPB length. At that, the nanostructuring of the whole anode substrate is not required, since the coarse anode facilitates the rapid diffusion of fuel gas to the active reaction area and removal of reaction products out from the anode [6]. Formation of the nanostructured anode functional layer

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“…At temperatures lower than 550 • C, a significant increase in the OCV was achieved by adding PdO to a Ni-SDC (samaria-doped ceria, Ce 0.8 Sm 0.2 O 1.9 ) anode [32]. In addition to the composition, the anode microstructure also affects the cell performance [36].…”

Section: Anode Materialsmentioning

confidence: 99%

Single‐Chamber Fuel Cells

Napporn

Kühn

2012

Fuel Cell Science and Engineering

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IntroductionIncreasing energy demands, environmental and availability issues related to the use of fossil fuels, and technical progress and downsizing of high-performance electronic systems are challenging us to develop clean, efficient, easily accessible, and rechargeable power-generating systems. Fuel cells have emerged as promising candidates for efficiently producing clean energy for various applications. High efficiencies are expected as these systems are not Carnot limited, and the chemical energy of the fuel and oxidant is directly converted into electrical energy. However, the costs of such systems are still high and are largely due to the nature of the materials used (catalysts, electrolytes, bipolar plates, and their accessories). Conventional fuel cells use two sealed, separate compartments for the fuel and the oxidant. The fuel and the oxidant can then be supplied separately to the respective electrodes, permitting controlled reactions at each electrode necessary for high cell performance. Gas management and manifolding, however, add additional costs to the system and become especially challenging when several single cells are to be assembled in stacks, and for miniaturized fuel cell systems. Moreover, the two gas compartments need to be gas-tight and adequate sealing is required that is chemically and thermomechanically compatible with the cell component materials and can withstand operation at elevated temperatures and during heating-cooling cycles. In solid oxide fuel cells (SOFCs), a high-temperature fuel cell system, common sealants are glass and ceramic materials that face long-term stability and durability issues and can crack during operation of the fuel cell.The single-chamber fuel cell (SC-FC) is a sealing-free fuel cell in which both electrodes are situated in a single compartment and a mixture of fuel and oxidant is supplied directly to the cell (Figure 2.1). SC-FCs promise higher thermomechanical strength in addition to a compact and simplified design. However, single-chamber operation requires selective electrode materials that catalyze the fuel reaction only at the anode and the oxidant reduction only at the cathode. The SC-FC concept dates back to fuel cell research for applications in space in the 1960s [1]. During the last 30 years, the performance of SC-FCs has increased considerably, mainly due to the

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Thin porous Ni–YSZ films as anodes for a solid oxide fuel cell

Cited by 32 publications

References 64 publications

Suppression of Ni agglomeration in PLD fabricated Ni-YSZ composite for surface modification of SOFC anode

Suppression of Ni agglomeration in PLD fabricated Ni-YSZ composite for surface modification of SOFC anode

Solid oxide fuel cell anode surface modification by magnetron sputtering of NiO/YSZ thin film

Single‐Chamber Fuel Cells

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