Structure and electrical properties of SrCoO3?? doped by CeO2

Wei, Qiang; Guo, Ruisong; Wang, F. H.; Li, H. L.

doi:10.1007/s10853-005-6961-x

Cited by 19 publications

(15 citation statements)

References 8 publications

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“…5. It was observed that the GCBCO sample sintered at 950°C exhibited the highest total conductivity, which was possibly related to powder diameter, porosity and interplanar crystal spacing [37]. The samples also exhibited an IMT at about 100°C, corresponding to what had been reported in the literature [28].…”

Section: Conductive Propertiessupporting

confidence: 73%

Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion

Zhang

Lü

Wei

et al. 2015

J Mater Sci: Mater Electron

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Double perovskite oxides Gd 0.8 Ca 0.2 BaCo 2-O 5?d have been successfully prepared by EDTA-citrate complexation process. The prepared samples were characterized by means of thermogravimetry-differential analysis, X-ray diffraction, Fourier transform infrared spectroscopy techniques. These analyses suggested that pure Gd 0.8 Ca 0.2 BaCo 2 O 5?d phase could be formed when the pH value was maintained above three and calcination temperature was higher than 850°C. The conductivity properties analyzed by means of four probes method, scanning electron microscopy and X-ray photoelectron spectroscopy indicated an improvement in conductivity with a high value of nearly 1200 S/cm, which was due to an increase in the number of small polaron hopping conduction units, Co 3? -O-Co 4? . Interestingly, the Gd 0.8-Ca 0.2 BaCo 2 O 5?d samples exhibited a semiconducting behavior through a wide range of temperature below 100°C and a metallic behavior at 100-500°C, thereby demonstrating that Gd 0.8 Ca 0.2 BaCo 2 O 5?d could meet the requirements of a smart material.

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Section: Conductive Propertiessupporting

confidence: 73%

Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion

Zhang

Lü

Wei

et al. 2015

J Mater Sci: Mater Electron

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“…However, due to the instability of carbonate‐based electrolytes in their tests, the real activities for the carbon‐supported perovskite oxide need further estimations . Based on the similar material, LaFe 0.5 Mn 0.5 O 3 , Ce is chosen to dope in with different atomic ratios, because it is reported that through the replacement of inert La cation by active Ce, not only oxygen capture can be enhanced, but also conductivity can be increased . However, the results showed that Ce has a very low solubility in LaFe 0.5 Mn 0.5 O 3 lattices, and the Ce‐incorporated samples are mainly LaFe 0.5 Mn 0.5 O 3 –CeO 2 composite instead of single‐phase La 1− x Ce x Fe 0.5 Mn 0.5 O 3 .…”

Section: Perovskite‐oxide‐based Compositesmentioning

confidence: 99%

Recent Advances in Perovskite Oxides as Electrode Materials for Nonaqueous Lithium–Oxygen Batteries

Tan

Liu

Shao

et al. 2017

Advanced Energy Materials

150

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Lithium-oxygen batteries are considered the next-generation power sources for many applications. The commercialization of this technology, however, is hindered by a variety of technical hurdles, including low obtainable capacity, poor energy efficiency, and limited cycle life of the electrodes, especially the cathode (or oxygen) electrode. During the last decade, tremendous efforts have been devoted to the development of new cathode materials. Among them, perovskite oxides have attracted much attention due to the extraordinary tunability of their compositions, structures, and functionalities (e.g., high electrical conductivities and catalytic activities), demonstrating the potential to achieve superior battery performance. This article focuses on the recent advances of perovskite oxides as the electrode materials in nonaqueous lithium-oxygen batteries. The electrochemical mechanisms of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on the surface of perovskite oxides are first summarized. Then, the effect of nanostructure and morphology on ORR and OER activities is reviewed, from nanoparticles to hierarchical porous structures. Moreover, perovskite-oxide-based composite electrodes are discussed, highlighting the enhancement in electrical conductivities, catalytic activities, and durability under realistic operating conditions. Finally, the remaining challenges and new directions for achieving rational design of perovskite oxides for nonaqueous lithium-oxygen batteries are outlined and discussed.

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“…Theoretical and experiment studies have been devoted to studying strontium manganites and cobaltite with the formulas SrMnO 3 and SrCoO 3 during the last several years [1,2]. The SrMnO 3 is known as a G-type antiferromagnetic insulator.…”

Section: Introductionmentioning

confidence: 99%

Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO₃ and SrCoO₃ samples

Khazaei

Malekzadeh²,

Amini

et al. 2010

Cryst. Res. Technol.

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In this study the effects of citric acid concentration, used as organic emulsifier, on the perovskite phase formation of the nano strontium manganite or cobaltite samples were studied. Stoichiometric perovskites in the absence and presence of citric acid were prepared by drying a solution containing molar ratio of Sr(NO 3 ) 2 /Mn(NO 3 ) 2 ·4H 2 O and Sr(NO 3 ) 2 /Co(NO 3 ) 2 ·6H 2 O = 1 followed by calcination at 900 °C for 5 h. Citric acid concentration, selected to be 0.0, 0.3, 0.6, 1.0, 1.3, 2.5 and 5 times of the total number of moles of the nitrate ions. The results revealed that increase in the citric acid concentration, larger than number of moles of the nitrate ions equivalent, deteriorates the perovskite phase formation. Instead, a new phase of carbonates and metal oxides are appeared.

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Structure and electrical properties of SrCoO3?? doped by CeO2

Cited by 19 publications

References 8 publications

Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion

Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion

Recent Advances in Perovskite Oxides as Electrode Materials for Nonaqueous Lithium–Oxygen Batteries

Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO₃ and SrCoO₃ samples

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Structure and electrical properties of SrCoO3?? doped by CeO2

Cited by 19 publications

References 8 publications

Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion

Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion

Recent Advances in Perovskite Oxides as Electrode Materials for Nonaqueous Lithium–Oxygen Batteries

Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO3 and SrCoO3 samples

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Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO₃ and SrCoO₃ samples