Activity of perovskite La1−xSrxMnO3 catalysts towards oxygen reduction in alkaline electrolytes

Tulloch, John; Donne, Scott W.

doi:10.1016/j.jpowsour.2008.12.024

Cited by 109 publications

(82 citation statements)

References 20 publications

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“…This is probably due to the incorporation of Al +3 into the BaFeO 3-δ lattice which leads to the crystallite decrease. Similar tendency has been found previously for La 1-x Sr x MnO 3 samples synthesized by coprecipitation of precursor acetates [33] and LaCo 1-x Ru x O 3 [34] prepared by Pechini sol-gel method. Table 2 summarizes the basic textural properties of the samples.…”

Section: Structural and Morphological Characterizationsupporting

confidence: 89%

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Hanane¹,

Omari²

2016

ChChT

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Abstract. In this study, BaFe 1−x Al x O 3-δ (0 ≤ x ≤ 0.3) perovskite-type oxides were prepared by sol-gel method using citric acid as chelating agent. The samples were subjected to various calcination temperatures in order to investigate the physicochemical properties of the oxide affected by the parameter. Thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray diffraction (XRD) techniques are used to explore precursor decomposition and to establish adequate calcination temperature for the preparation of the nanopowders. The studied compounds have hexagonal crystal structure at the temperature of 1123 K. The samples obtained after calcination at 1123 K were characterized by XRD, Brunauer-Emmett-Teller surface area analysis, scanning electron microscopy, powder size distribution and electrical conductivity. The microstructure and morphology of the compounds show that the particles are nearly spherical in shape and are partially agglomerated. The highest surface area and total pore volume are achieved for BaFe 0.8 Al 0.2 O 3-δ oxide. Temperature dependence of electrical conductivity shows a semiconducting behavior.

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Section: Structural and Morphological Characterizationsupporting

confidence: 89%

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Hanane¹,

Omari²

2016

ChChT

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“…(79 pm) to Mn 4? (67 pm) [6]. With the increase in the ratio of Sr to La, the relative intensity of peaks for LSMx powders gradually reduced implying that the crystallinity of LSMx powders was lowered with increasing Sr content.…”

Section: Characterization Of the As-prepared Samplesmentioning

confidence: 97%

“…Among them, La 1-x Sr x MnO 3 (x = 0.2-0.8) materials showed the reasonable catalytic activity for ORR/OER and for combustion of volatile organic compounds [6][7][8]. As a catalyst, the catalytic activity and stability are prerequisite, strongly relating to its morphology, particle size distribution, and crystallinity, which are determined by the preparation method adopted [9].…”

mentioning

confidence: 99%

A modified sol–gel method for low-temperature synthesis of homogeneous nanoporous La1−x Sr x MnO3 with large specific surface area

Zhuang

Liu

Zeng

et al. 2015

J Sol-Gel Sci Technol

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A modified sol-gel (MSG) method was developed to synthesize perovskite La 1-x Sr x MnO 3 (x = 0.2, 0.4, 0.6, 0.8) with large specific surface area that allows for control of their particle size from the micrometer level to the nanometer level with novel nanoporous structure. The MSG method utilized carbon black (Vulcan XC-72R) as a poreforming material during the preparation process. Two important process parameters, the calcination temperature and the pore former material addition, were investigated to control the size of the La 1-x Sr x MnO 3 particles. The phase evolution of La 1-x Sr x MnO 3 powders was investigated by thermogravimetric analysis (TG/DSC) and X-ray diffraction pattern. The results showed that the pure La 0.6 Sr 0.4 MnO 3 phase has been obtained at about 550°C in air, which is lowered around 150°C comparing to conventional sol-gel method. In scanning electron microscope studied, it presented novel homogeneous nanoporous morphology with the average particle size from 30 to 100 nm. Based on the Brunauer-Emmett-Teller method analysis, the specific surface area of La 1-x Sr x MnO 3 was significantly influenced by the calcination temperature, the pore former material addition and the strontium content. The largest specific surface area of La 0.2 Sr 0.8 MnO 3 reached 114.3 m 2 /g. Graphical abstract

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“…According to the RRDE theory, the overall electron transfer numbers and the corresponding mole [ 3 ] where i d is the current on the disk electrode, i r is the current on the ring electrode, and N is the collection coefficient of the ring electrode (0.20±0.01). The overall electron transfer numbers in the ORR process were calculated over a potential range from -0.20 V to -0.50 V at 1600 rpm in both 1 M and 6 M KOH, as presented in Figure 12.…”

Section: Rrde Measurementsmentioning

confidence: 99%

Electrocatalytic Activity of Non-Stoichiometric Perovskites toward Oxygen Reduction Reaction in Alkaline Electrolytes

Yuan¹,

Li²,

Ivey³

et al. 2011

ECS Trans.

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Perovskite La x Ca 0.4 MnO 3 (x = 0.4, 0.5, 0.6) powder was prepared through a sol-gel method and characterized by X-ray diffraction (XRD), a gas adsorption technique (BET) and transmission electron microscopy (TEM). The electrocatalytic properties of La x Ca 0.4 MnO 3 /C composites towards the oxygen reduction reaction (ORR) were studied using rotating ring-disk electrode (RRDE) techniques and Koutecky-Levich theory in both 1 M and 6 M KOH electrolytes. The results show better ORR activities for non-stoichiometric perovskites than that for stoichiometric La 0.6 Ca 0.4 MnO 3 . The overall electron transfer numbers for these La x Ca 0.4 MnO 3 composites are in the range of 3.2-3.7, and with decreasing values of x the electron transfer number increases and accordingly H 2 O 2 production decreases. These results suggest that the existence of a Mn reduction/oxidation pair in Ca-doped nonstoichiometric perovskites could activate the ORR reaction sites, resulting in improved catalytic activity.

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Activity of perovskite La1−xSrxMnO3 catalysts towards oxygen reduction in alkaline electrolytes

Cited by 109 publications

References 20 publications

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

A modified sol–gel method for low-temperature synthesis of homogeneous nanoporous La1−x Sr x MnO3 with large specific surface area

Electrocatalytic Activity of Non-Stoichiometric Perovskites toward Oxygen Reduction Reaction in Alkaline Electrolytes

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