Electrochemical performance of Ni-based anodes for solid oxide fuel cells

Presto, Sabrina; Barbucci, Antonio; Carpanese, Maria Paola; Viviani, Massimo; Marazza, R.

doi:10.1007/s10800-009-9857-7

Cited by 11 publications

(6 citation statements)

References 27 publications

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“…As has been mentioned, a weak P H2 dependency is observed for the Ni/YSZ system in most cases. [22][23][24][39][40][41] The reaction orders' dependences upon P H2 range from −0.26 to 0.15 in different studies. Strong dependence can only be observed at very low P H2 regions.…”

Section: Discussionmentioning

confidence: 99%

“…Different tendencies between Ni and oxide anodes have been observed. H 2 partial pressure in most cases affects the overall performance very little for the Ni-based anodes, [22][23][24][25] but it was generally shown that the performance of oxide anodes depended heavily on it. [26][27][28] Therefore, in continuation from our previous work, 29 the reaction mechanisms and rate-limiting steps for such oxide electrodes in an anodic environment are investigated in more detail in this paper.…”

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confidence: 99%

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Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Gong

Liu

2014

J. Electrochem. Soc.

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Redox-stable ceramic electrodes, Co and Ni doped yttrium chromites, for solid oxide fuel cell (SOFC) are characterized by electrochemical impedance spectroscopy (EIS) in various P O2 and P H2 atmosphere. The polarization resistances for Y 0.8 Ca 0.2 Cr 0.8 Co 0.2 O 3-δ (YCCC) and Y 0.8 Ca 0.2 Cr 0.9 Ni 0.1 O 3-δ (YCCN) on yttrium stabilized zirconia (YSZ) electrolyte are 0.96 and 8.4 cm 2 in wet H 2 , 1.2 and 36.7 cm 2 in air at 850 • C, respectively. For the anode application, the rate-limiting steps (RDS) are identified as charge transfer and surface diffusion for both YCCC and YCCN. The primary active zone in YCCN is three-phase boundary (3PB) but extends to a small portion of the electrode bulk in the YCCC anode. For the cathode application, O 2 dissociative adsorption or diffusion is one of the RDS for both electrodes, and the active zone is limited to the 3PB area. The influence of electrolyte to electrode performance is investigated by replacing YSZ electrolyte with scandium stabilized zirconium (SSZ). Smaller polarization resistances are observed on each electrode in both wet H 2 and air atmospheres. Replacement of electrolyte can alter not only the rate of charge transfer process but also in some cases other surface processes not related to the electrolyte directly. It is proposed that the impact of the electrolyte on each electrode process is passed down as in a chain and the charge transfer step functions as the first ring in the chain. The best performance is obtained with the YCCC/SSZ combination, 0.49 and 1 cm 2 in wet H 2 and air at 850 • C, respectively, making YCCC a promising electrode.Yttrium chromites were proposed as alternative interconnect materials in SOFC applications due to the advantages found in its chemical compatibility with YSZ electrolyte and smaller chemical expansion. [1][2][3][4] With high tolerance to the reducing atmosphere, they can also work as excellent parent materials so that different transition metals whose oxides are otherwise not stable in the typical anode atmosphere can be incorporated into the chromium site. By substitution of yttrium and/or chromium site elements, the thermal expansion coefficient, electrical conductivity and catalytic property could be tailored to meet the anode requirements. 5-7 Recently, Ca & Co co-doped YCrO 3 (Y 0.8 Ca 0.2 Cr 0.8 Co 0.2 O 3-δ ) was developed successfully as an anode candidate by Yoon et al. 7 Decent performance and good tolerance toward S-poisoning were demonstrated: a 0.3 cm 2 polarization resistance for the fuel cell operated at 850 • C in H 2 with 20 ppm H 2 S.Besides this pioneering study on the performance of this material system, investigations regarding other electrochemical properties of such materials are still limited in literature. The catalytic mechanism study among these investigations is crucial to understand the reaction pathway and guide the optimization of the materials. For instance, the oxygen reduction reaction (ORR) of typical perovskite cathodes like (LaSr)MnO 3 (LSM) 8-12 and (LaSr)(CoFe)O 3 (LSCF) 13-1...

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Gong

Liu

2014

J. Electrochem. Soc.

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“…For instance, attention has been paid to the formulation of lanthanum perovskites, that is LaAlO 3 , 3 for various catalytic reactions, such as oxidative methane coupling 4 and NO x ‐assisted soot combustion, 5 and as a support for transition metal catalysts 6 . In the frame of perovskite production, La plays a central role also in the development of cathodes for low‐temperature solid oxide fuel cells 7 and recently LaCoO 3 has been reported as a suitable catalyst for NO oxidation 8 . Lanthanum is reported as an important stabilizing agent for γ ‐Al 2 O 3 , 9–12 and it allows higher ethylene yield in ethanol dehydration 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Lanthanum‐based catalysts for (bio)ethanol conversion: effect of preparation method on catalytic performance – hard templating versus hydrolysis

Valsamakis

Garbarino

2020

J of Chemical Tech & Biotech

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BACKGROUND Lanthanum‐based materials, namely La2O3 and La(OH)3, are of interest for several heterogeneous catalytic reactions because of their properties; that is, in spite of their poor resistance to CO2 and moisture, readily converting at room temperature to carbonates and oxycarbonates and requiring strong thermal treatments to revert back to their original form. RESULTS In this study, hard template and hydrolysis synthetic procedures have been compared for the production of nanostructured La‐based catalysts. The materials have been characterized by means of various techniques and tested in ethanol conversion as a probe reaction. Both preparation procedures give rise to higher surface areas than those reported for conventional synthesis and the surface properties are different, showing the formation of oxysulfate or of a complex mixture of carbonate and hydroxycarbonate. CONCLUSIONS Lanthanum‐based oxide can be efficiently prepared using different synthetic procedures that allow to obtain nanosized La‐based mixed oxides. However, great attention should be paid to the preparation step, because the role of impurities markedly affects the stability and the catalytic properties of the prepared oxide. The use of the hard templating procedure allows a reduction of the amount of carbonate upon air exposure, thus stabilizing the starting oxide, by protecting the surface with the presence of lanthanum oxysulfate (La2O2SO4). © 2020 Society of Chemical Industry

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“…[1][2][3][4][5][6][7][8][9][10] These membranes have to fulfil several requirements: (1) they have to be thin enough (o1 mm) to reduce ohmic losses to values below 0.15 O cm À2 at temperatures below 500 1C. 6,[11][12][13] (2) Full crystallinity of the metal oxide electrolytes has to be assured. Ongoing crystallization processes and amorphous residues are disadvantageous for ionic diffusion in a transforming ''metastable'' lattice.…”

Section: Introductionmentioning

confidence: 99%

Crystallization of zirconia based thin films

Stender

Frison

Conder

et al. 2015

Phys. Chem. Chem. Phys.

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The crystallization kinetics of amorphous 3 and 8 mol% yttria stabilized zirconia (3YSZ and 8YSZ) thin films grown by pulsed laser deposition (PLD), spray pyrolysis and dc-magnetron sputtering are explored. The deposited films were heat treated up to 1000 °C ex situ and in situ in an X-ray diffractometer. A minimum temperature of 275 °C was determined at which as-deposited amorphous PLD grown 3YSZ films fully crystallize within five hours. Above 325 °C these films transform nearly instantaneously with a high degree of micro-strain when crystallized below 500 °C. In these films the t'' phase crystallizes which transforms at T > 600 °C to the t' phase upon relaxation of the micro-strain. Furthermore, the crystallization of 8YSZ thin films grown by PLD, spray pyrolysis and dc-sputtering are characterized by in situ XRD measurements. At a constant heating rate of 2.4 K min(-1) crystallization is accomplished after reaching 800 °C, while PLD grown thin films were completely crystallized already at ca. 300 °C.

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Electrochemical performance of Ni-based anodes for solid oxide fuel cells

Cited by 11 publications

References 27 publications

Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Characterization of Doped Yttrium Chromites as Electrodes for Solid Oxide Fuel Cell by Impedance Method

Lanthanum‐based catalysts for (bio)ethanol conversion: effect of preparation method on catalytic performance – hard templating versus hydrolysis

Crystallization of zirconia based thin films

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