Electro-catalytic performance of 60%NiO/Ce0.9Zr0.1O2 cermets as anodes of intermediate temperature solid oxide fuel cells

Zimicz, Maria Genoveva; Núñez, P.; Ruiz-Morales, J.C.; Lamas, Diego G.; Larrondo, Susana Adelina

doi:10.1016/j.jpowsour.2013.03.092

Cited by 18 publications

(14 citation statements)

References 31 publications

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“…Previous studies in our research group indicated that the mixed oxide with nominal composition Ce 0.9 Zr 0.1 O 2 is a great catalyst for total oxidation of methane, and excellent support of nickel metallic phase to catalyse partial oxidation of methane , . Moreover, when impregnated with Ni or Ni/Cu, this oxide resulted a great anode material for Intermediate Temperature Solid Oxide Fuel Cells (IT‐SOFCs) , …”

Section: Introductionmentioning

confidence: 89%

“…CeO 2 ‐ZrO 2 (ZDC) mixed oxides have a broad range of applications in catalysis and fuel cells. There are many reports about their use as catalysts to control the emissions from mobile sources, as support in Ni‐ZDC catalysts to produce syngas from fossil or renewable sources,, in Cu‐ZDC catalyst to COPROX reaction and as electrode materials for solid oxide fuel cells , , …”

Section: Introductionmentioning

confidence: 99%

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Ce_0.9Zr_0.1O₂Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties

2020

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The aim of this work is to study the effect of the citric acid to metal molar ratio (CA/M) used in the citrate synthesis route on the structural, morphological and redox properties of CeO 2 -ZrO 2 mixed oxides. The CA/M ratio strongly affects reducibility, crystallite size and texture. The increase in calcination temperature promotes sample crystallinity while nanometric sizes remain up to 1000°C. H 2 -TPR, in situ dispersive X-ray absorption (DXAS) and Raman experiments show that samples [a] R.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Ce_0.9Zr_0.1O₂Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties

2020

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“…Several strategies can be adopted to improve the performance and coking resistance in hydrocarbon-fuelled SOFCs. One effective approach is the use of nickel-based anodes combined with materials with excellent catalytic activity and coke resistance, such as ceria.CeO 2 -based mixed oxides have received attention as components of anode materials for SOFCs.These compounds present mixed ionic and electronic conductivity in reducing atmospheres, excellent catalytic activity for the combustion of hydrocarbons, and an adequate resistance to carbon deposition [11]. It has also been reported that the addition or coating of CeO 2 increases the methane oxidation activity and reduces the carbon deposition in the nickel Ni/YSZ.…”

mentioning

confidence: 99%

“…CeO 2 -based mixed oxides have received attention as components of anode materials for SOFCs.These compounds present mixed ionic and electronic conductivity in reducing atmospheres, excellent catalytic activity for the combustion of hydrocarbons, and an adequate resistance to carbon deposition [11]. It has also been reported that the addition or coating of CeO 2 increases the methane oxidation activity and reduces the carbon deposition in the nickel Ni/YSZ.…”

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confidence: 99%

Performance of a Direct Methane Solid Oxide Fuel Cell Using Nickel-Ceria-Yttria Stabilized Zirconia as the Anode

et al. 2020

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A nickel-ceria-yttria stabilized zirconia (Ni-CYSZ) cermet material was synthesized and tested as the anode for the direct oxidation of methane in a solid oxide fuel cell (SOFC) with YSZ as the electrolyte and strontium-doped lanthanum manganite (LSM) as the cathode. Initially, the electrochemical behavior was investigated under several load demands in wet (3% H2O) CH4 at 850 °C during 144 h using I-V curves, impedance spectra, and potentiostatic measurements. Long-term tests were subsequently conducted under 180 mA·cm–2 in wet CH4 for 236 h and dry CH4 for 526 h at 850 °C in order to assess the cell stability. Material analysis was carried out by SEM-EDS after operation was complete. Similar cell performance was observed with wet (3% H2O) and dry CH4, and this indicates that the presence of water is not relevant under the applied load demand. Impedance spectra of the cell showed that at least three processes govern the direct electrochemical oxidation of methane on the Ni-CYSZ anode and these are related to charge transfer at high frequency, the adsorption/desorption of charged species at medium frequency and the non-charge transfer processes at low frequency. The cell was operated for more than 900 h in CH4 and 806 h under load demand, with a low degradation rate of ~0.2 mV·h–1 observed during this period. The low degradation in performance was mainly caused by the increase in charge transfer resistance, which can be attributed to carbon deposition on the anode causing a reduction in the number of active centers. Carbon deposits were detected mostly on the surface of Ni particles but not near the anode/electrolyte interface or the cerium surface. Therefore, the incorporation of cerium in the anode structure could improve the cell lifetime by reducing carbon formation.

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“…• Testar os materiais como ânodos numa SOFC de duas câmaras operando com H 2 /O 2 e CH 4 /O 2 [162].…”

Section: Trabalhos Futurosunclassified

Síntese e caracterização de nanocatalisadores de ZrO2-CeO2/Ni para aplicação em ânodos de células a combustível de óxido sólido

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Mesoporous ZrO 2-CeO 2 composites are being developed due to their excellent morphological and structural properties, which are necessary for their use in several applications, including gas sensors, three way catalysts (TWC) and solid oxide fuel cells (SOFCs). In this work a new synthesis method was developed based on a template cooperative sol-gel approach, using the tri-block polymer P-123 and Zr/Ce chlorides as the oxides' precursors. Since high cerium oxide quantities lead to better catalytic performance, the ZrO 2-x(mol)%CeO 2 were synthesized with x = 50, 70 and 90. Two different calcination processes were tested (until 540 and 400 • C). NiO was impregnated in order to obtain enough electronic conductivity for their application as SOFC anodes. X-ray diffraction results showed that these systems are biphasic and crystallized preferentially into cubic fluorite type structure together with smaller quantities of the tetragonal zirconia-ceria phase. A 100% cubic phase was retained for 90% of CeO 2 after 400 • C calcination. Textural and morphological characteristics for 540 • C calcination evaluated from N 2 sorption, electronic microscopy images and small angle X-ray scattering revealed a two-density (pores/particles) random crystalline clusters of mesoporous ZrO 2-CeO 2 , with homogeneous composition, average superficial area (30-40 m 2 /g), high dispersivity of pores/particle sizes. Calcination until 400 • C presented a narrower pore size distribution and smaller pores, with higher superficial area (> 100 m 2 /g). It was observed that NiO particles formed an uniform layer over the ZrO 2-CeO 2 without filling or blocking the zirconia-ceria pores. Temperature programmed reduction experiments showed that for all ceria contents the reduction percentage of Ce 4+ species in the samples was higher and at lower temperatures (beginning of reduction at 300 • C) than standard CeO 2 (750 • C). After NiO impregnation this behavior is similar, with NiO reducing at lower temperatures (320 • C) as well. Catalytic activity for methane total oxidation reaction was similar for both calcination temperatures, for 90% CeO 2 , showing 50% of CH 4 conversion around 540 • C. Absorption X-ray in-situ experiments at Ni K-edge and Ce L III-edge showed that all ceria contents are active for total and partial methane oxidation, CH 4 decomposition and CO oxidation at 600 • C. Electrochemical impedance spectroscopy measurements showed low resistivity for higher ceria content, 0,97 Ωcm 2 at 750 • C in 5% CH 4 /3%H 2 O/N 2 atmosphere. Resuming, the material developed in this work presents the best morphological, structural, electrical and catalytical properties for applications as SOFC anode and catalyst, compared to similar materials reported in the literature.

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Electro-catalytic performance of 60%NiO/Ce0.9Zr0.1O2 cermets as anodes of intermediate temperature solid oxide fuel cells

Cited by 18 publications

References 31 publications

Ce_0.9Zr_0.1O₂Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties

Ce_0.9Zr_0.1O₂Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties

Performance of a Direct Methane Solid Oxide Fuel Cell Using Nickel-Ceria-Yttria Stabilized Zirconia as the Anode

Síntese e caracterização de nanocatalisadores de ZrO2-CeO2/Ni para aplicação em ânodos de células a combustível de óxido sólido

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Electro-catalytic performance of 60%NiO/Ce0.9Zr0.1O2 cermets as anodes of intermediate temperature solid oxide fuel cells

Cited by 18 publications

References 31 publications

Ce0.9Zr0.1O2Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties

Ce0.9Zr0.1O2Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties

Performance of a Direct Methane Solid Oxide Fuel Cell Using Nickel-Ceria-Yttria Stabilized Zirconia as the Anode

Síntese e caracterização de nanocatalisadores de ZrO2-CeO2/Ni para aplicação em ânodos de células a combustível de óxido sólido

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Ce_0.9Zr_0.1O₂Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties

Ce_0.9Zr_0.1O₂Mixed Oxide Prepared by the Citrate Route: Impact of Synthesis Conditions on Physicochemical and Redox Properties