Different oxidation routes for lattice oxygen recovery of double-perovskite type oxides LaSrFeCoO 6 as oxygen carriers for chemical looping steam methane reforming

Zhao, Kun; Shen, Yang; Huang, Zhen; He, Fang; Wei, Guoqiang; Zheng, Anqing; Li, Haibin; Zhao, Zengli

doi:10.1016/j.jechem.2016.11.016

Cited by 47 publications

(17 citation statements)

References 30 publications

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“…The binding energy and area under the XPS peaks corresponding with all the cations are enlisted in Table I. Binding energies of all the oxidation states were found to be similar to what was reported in the literature [33][34][35][36].…”

Section: Xps Spectrasupporting

confidence: 77%

Enhancement of thermoelectric power factor by inducing octahedral ordering in La2−xSrxCoFeO6 double perovskites

et al. 2019

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Among the various oxide thermoelectric materials, double perovskites provide more flexibility to maneuver interdependent thermoelectric parameters to achieve enhanced thermoelectric figure of merit (ZT), as octahedral ordering, i.e., arrangement of B O 6 and B O 6 octahedra, present in the A 2 B B O 6 structure is impacted by cation doping. In this work, we investigated the role of octahedral distortion on thermoelectric properties of La 2-x Sr x CoFeO 6 (LSCF) double perovskites with 0.0 x 1.0, synthesized by the autocombustion route. Rietveld refinement of x-ray diffraction data revealed the phase transition with increasing Sr concentration (x) in LSCF from rhombohedral crystal structure with R-3c space group (x 0.6) to monoclinic P2 1 /n (0.8 x 1.0) space group. X-ray photoemission spectroscopy analysis further confirmed the presence of multiple oxidation states of Co and Fe, and shifts in oxidation states population driven by Sr content. These multivalent cations participated in the charge transport mechanism, which was explained by the small polaron hopping conduction model in these double perovskites. The electrical conductivity at room temperature was found to be increased by more than 10 7 times in LSCF due to Sr doping, causing a large enhancement in the thermoelectric power factor. Gradual decrease in the octahedral tilt angle with increasing Sr content in LSCF, leading toward the change of crystal structure from disordered (R-3c) to rock-salt-ordered (P2 1 /n) double perovskites, was found to be responsible for the large decrease in activation energy barrier for small polaron hopping conduction in the LSCF system, resulting in the phenomenal increase in electrical conductivity. Maximum thermoelectric figure of merit, ZT = 0.11 was obtained at 723 K for La 2-x Sr x CoFeO 6 with x = 0.2 composition.

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Section: Xps Spectrasupporting

confidence: 77%

Enhancement of thermoelectric power factor by inducing octahedral ordering in La2−xSrxCoFeO6 double perovskites

et al. 2019

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“…The values of spin orbit split-ting energy of Co2p3/2 and Co2p1/2 are ~15 eV. The existence of mixed oxides with Co 2+ and Co 3+ 19 was also confirmed by the two satellite peaks presented at the high binding energy sides [22]. It is noteworthy that the XPS peaks of Co2p3/2 and Co2p1/2 for all GdFe1−xCoxO3 samples (x = 0.2; 0.5; 0.8; 1) are broad, indicating the existence of additional Co oxidation state.…”

Section: Resultsmentioning

confidence: 75%

The Effect of Transition Metal Substitution in the Perovskite-Type Oxides on the Physicochemical Properties and the Catalytic Performance in Diesel Soot Oxidation

et al. 2021

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The paper is focused on the Fe for Co substitution effect on the redox and catalytic properties in the perovskite structure of GdFeO3. The solid oxides with the composition GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) were obtained by the sol-gel method and characterized by various methods: X-Ray diffraction (XRD), temperature-programmed reduction (H2-TPR), N2 sorption, temperature-programmed desorption of oxygen (TPD-O2), simultaneous thermal analysis (STA), and X-ray photoelectron spectroscopy (XPS). The H2-TPR results showed that an increase in the cobalt content in the GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) leads to a decrease in the reduction temperature. Using the TPD-O2 and STA methods, the lattice oxygen mobility is increasing in the course of the substitution of Fe for Co. Thus, the Fe substitution in the perovskite leads to an improvement in the oxygen reaction ability. Experiments on the soot oxidation reveal that catalytic oxidation ability increases in the series: GdFe0.5Co0.5O3 ˂ GdFe0.2Co0.8O3 ˂ GdCoO3, which is in good correlation with the increasing oxygen mobility according to H2-TPR, TPD-O2, and STA results. The soot oxidation over GdFeO3 and GdFe0.8Co0.2O3 is not in this range due to the impurities of iron oxides and higher specific surface area.

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“…As shown in Fig. 4 (a), the binding energy of Fe 2 p 3/2 is located at 709.0 and 711.0 eV, while that of Fe 2 p 1/2 is located around 722.6 and 724.6 eV, respectively [17,18] . It is suggested that the Fe exists in mixed states of Fe 2 + and Fe 3 + in the two samples.…”

Section: Xps Characterizationmentioning

confidence: 89%

Infiltration of Ce0.8Gd0.2O1.9 nanoparticles on Sr2Fe1.5Mo0.5O6- cathode for CO2 electroreduction in solid oxide electrolysis cell

Zhou

Zhang

et al. 2019

Journal of Energy Chemistry

110

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Different oxidation routes for lattice oxygen recovery of double-perovskite type oxides LaSrFeCoO 6 as oxygen carriers for chemical looping steam methane reforming

Cited by 47 publications

References 30 publications

Enhancement of thermoelectric power factor by inducing octahedral ordering in La2−xSrxCoFeO6 double perovskites

Enhancement of thermoelectric power factor by inducing octahedral ordering in La2−xSrxCoFeO6 double perovskites

The Effect of Transition Metal Substitution in the Perovskite-Type Oxides on the Physicochemical Properties and the Catalytic Performance in Diesel Soot Oxidation

Infiltration of Ce0.8Gd0.2O1.9 nanoparticles on Sr2Fe1.5Mo0.5O6- cathode for CO2 electroreduction in solid oxide electrolysis cell

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