Sintering temperature dependence of conductivity, porosity and specific surface area of LaNi0.6Fe0.4O3 ceramics as cathode material for solid oxide fuel cells—Superiority of Pechini method among various solution mixing processes

Niwa, Eiji; Uematsu, Chie; Hashimoto, Takuya

doi:10.1016/j.materresbull.2012.09.055

Cited by 38 publications

(11 citation statements)

References 9 publications

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“…Figure shows the average porosity of the SrFe 0.5 Ti 0.5 O 3‐δ perovskite cathode films sintered at temperatures ranging from 900°C to 1300°C. Without any introduction of pore former, the porosity fell at an acceptable range (20% to 40%) for SOFC electrodes . As the sintering temperature increased, the densification also increased; thus, the porosity decreased .…”

Section: Resultsmentioning

confidence: 98%

Effects of sintering temperature on the structural and electrochemical properties of SrFe_0.5Ti_0.5O_3‐δ perovskite cathode

Baharuddin

Muchtar

Somalu

et al. 2017

Int J Applied Ceramic Tech

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The effects of sintering temperature on the structural and electrochemical properties of SrFe 0.5 Ti 0.5 O 3-d perovskite cathode film was investigated. For the structural properties of SrFe 0.5 Ti 0.5 O 3-d film sintered at a temperature ranging from 900-1300°C, changes in surface and cross-sectional microstructure were studied. Surface porosity and micro hardness were analyzed. The relationship of the structural properties with the electrical and electrochemical performances of the SrFe 0.5-Ti 0.5 O 3-d film was examined. The high densification of the film sintered at 1300°C led to the better electrical conductivity of 16.38 S cm À1 than the 4.86 S cm À1 of the film sintered at 900°C at an operating temperature of 800°C. For the electrochemical performance, the SrFe 0.5 Ti 0.5 O 3-d film sintered at 1300°C gained a low area specific resistance (ASR) value of 38.70 O cm 2 at 800°C. The ASR further decreased to 0.99 O cm 2 for the thicker film sintered at the same temperature. K E Y W O R D S microstructure, perovskite, sintering, solid oxide fuel cell

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Section: Resultsmentioning

confidence: 98%

Effects of sintering temperature on the structural and electrochemical properties of SrFe_0.5Ti_0.5O_3‐δ perovskite cathode

Baharuddin

Muchtar

Somalu

et al. 2017

Int J Applied Ceramic Tech

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“…For verification of the phase formation of interest analysis was performed by XRD, in figure 5 is noted that although the heat treatment time has been reduced, increasing the calcination temperature resulted in obtaining the LNF. However, the samples with x ≠ 0.4 have a small amount of the NiO phase, which can be neglected for applications in SOFCs [6]. SEM images of these compounds indicate that reducing the heat treatment time resulted in the formation of smaller particles (diameters ~ 30-50nm) and increase the surface area of the compounds (figure 6).…”

Section: Resultsmentioning

confidence: 99%

Preparation and Powder Characteristics of LNF Compounds for Application in SOFCs

2015

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LaNi (1-x) Fe x O 3 (LNF) compounds, with 0.0 ≤ x ≤ 0.4, have interesting physical properties such as high ionic and electronic conductivity, good catalytic activity for oxygen reduction, and thermodynamic compatibility with the YSZ electrolyte, which makes them potential candidates for SOFCs (solid oxides fuel cells) cathodes. Order for these excellent properties are achieved, it is necessary to ensure the presence of the homogeneous phase LNF. The methods for preparing these compounds influence the formation and stabilization of the homogeneous phase and therefore the physical properties of these oxides. For this reason, this work deals with the synthesis of the family of compounds LNF and the correlation between the synthesis and the physical properties obtained. In this context, LNF compounds were synthesized by a modified Pechini method for production of powders. Two different synthetic routes were employed, changing the source of nickel: nickel acetate and nickel nitrate. In order to study the thermal evolution of the LNF phase in these compounds, thermal analysis (DTG) and X-ray diffraction (XRD) were performed. The XRD was verified that the series of compounds synthesized by nickel acetate originated monophasic samples different from those obtained with nickel nitrate. We studied the influence of time and sintering temperature on the superficial characteristics of the samples and it was observed the reduction in sintering time allowed obtaining powders of perovskite phase, with grain sizes and smaller clusters than what was observed in the compound -treated for 10 h. To characterize the particle size, the powders were characterized by curves absorption/desorption (BET). The results also show that heat treatment for shorter times resulted in decreased particle size as well as increase the surface area of the compounds. INTRODUCTIONOne of the challenges of the XXI century has been the development of new technologies that optimize the way we store energy. In this context, fuel cells are highlighted, as are systems that convert chemical energy supplied by a fuel and an oxidant into electrical energy. There are different fuel cell types, classified according to the electrolyte that composes themselves. The SOFCs, constituted by a solid electrolyte, are interest subject of several studies and they have the advantage of operating at elevated temperatures. The physical properties of SOFCs depend on the choice of materials that compose the electrodes and the electrolyte. LNF oxides have suitable properties to be used as cathodes for SOFCs, due to their good electrical conductivity (> 100 S cm -1 ) and thermal conductivity and coefficient of thermal expansion (in the range of 10-13·106 K -1 ) compatible with the electrolytes commonly used in SOFCs, such as YSZ [1,2]. EXPERIMENT LNF powder compounds are prepared using polymerized complex process (PC) synthesis route. The preparation samples was carried out starting from two distinct precursor solutions, one containing Ni(NO 3 ) 2 •6H 2 O (99,9985%, Alfa Aesar) and t...

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“…Researchers believe that the ionic conductivity of cathodes will improve with this porosity. Several researchers have suggested that the porosity of the cathode should be in the range of 20 % to 40 % to enhance its electrochemical performance [18][19][20][21]. In the current study, the optimum sintering temperature for the LSCF-SDCC cathode composite may be selected from 550, 600, and 650°C.…”

Section: Effect Of Sintering Temperature (T S )mentioning

confidence: 99%

INFLUENCE OF SINTERING TEMPERATURE ON THE POLARIZATION RESISTANCE OF LaO20.6SrO20.4CoO20.2FeO20.8O3-δ - SDC CARBONATE COMPOSITE CATHODE

Baharuddin

Muchtar²,

Somalu³

et al. 2016

Ceramics - Silikaty

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Sintering temperature dependence of conductivity, porosity and specific surface area of LaNi0.6Fe0.4O3 ceramics as cathode material for solid oxide fuel cells—Superiority of Pechini method among various solution mixing processes

Cited by 38 publications

References 9 publications

Effects of sintering temperature on the structural and electrochemical properties of SrFe_0.5Ti_0.5O_3‐δ perovskite cathode

Effects of sintering temperature on the structural and electrochemical properties of SrFe_0.5Ti_0.5O_3‐δ perovskite cathode

Preparation and Powder Characteristics of LNF Compounds for Application in SOFCs

INFLUENCE OF SINTERING TEMPERATURE ON THE POLARIZATION RESISTANCE OF LaO20.6SrO20.4CoO20.2FeO20.8O3-δ - SDC CARBONATE COMPOSITE CATHODE

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Sintering temperature dependence of conductivity, porosity and specific surface area of LaNi0.6Fe0.4O3 ceramics as cathode material for solid oxide fuel cells—Superiority of Pechini method among various solution mixing processes

Cited by 38 publications

References 9 publications

Effects of sintering temperature on the structural and electrochemical properties of SrFe0.5Ti0.5O3‐δ perovskite cathode

Effects of sintering temperature on the structural and electrochemical properties of SrFe0.5Ti0.5O3‐δ perovskite cathode

Preparation and Powder Characteristics of LNF Compounds for Application in SOFCs

INFLUENCE OF SINTERING TEMPERATURE ON THE POLARIZATION RESISTANCE OF LaO20.6SrO20.4CoO20.2FeO20.8O3-δ - SDC CARBONATE COMPOSITE CATHODE

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Effects of sintering temperature on the structural and electrochemical properties of SrFe_0.5Ti_0.5O_3‐δ perovskite cathode

Effects of sintering temperature on the structural and electrochemical properties of SrFe_0.5Ti_0.5O_3‐δ perovskite cathode