Equilibrium of oxygen sorption on perovskite-type lanthanum cobaltite sorbent

AIChE Journal ◽  
2003 ◽  
Vol 49 (3) ◽  
pp. 793-798 ◽  
Author(s):  
Zhaohui Yang ◽  
Y. S. Lin
Keyword(s):  
Oxygen Sorption ◽  
Lanthanum Cobaltite ◽  
Perovskite Type

Microwave Synthesis and Characterization of Nanoscale Lanthanum Cobaltite

2012 ◽  
Vol 476-478 ◽  
pp. 1322-1326
Author(s):  
Xiao Yu Jiang ◽  
Jin Chen ◽  
Wen Zhe Chen
Keyword(s):  
Cyclic Voltammetry ◽  
Steady State ◽  
Microwave Irradiation ◽  
Reaction Order ◽  
Synthesis And Characterization ◽  
Cyclic Voltammogram ◽  
Lanthanum Cobaltite ◽  
Bet Analysis ◽  
Perovskite Type

Nanoscale lanthanum cobaltite with perovskite-type was successfully synthesized by microwave irradiation directly and was characterized by XRD, SEM, XPS and BET analysis. The results show that the size of particle was 18 nm averagely, the surface area to be 31.0 m2 g−1. The electrochemical properties were studied by cyclic voltammetry and steady state polarization. The cyclic voltammogram between 0 and 0.55 V exhibited two pairs of redox peaks prior to the onset of O2 evolution in 1 mol dm−3 KOH. The Tafel slope and the reaction order with respect to concentration of OH− were found to be 60 mV decade−1 and ca. 1, respectively.

ChemInform Abstract: Oxygen Sorption and Catalytic Properties of La1-xSrxCo1-yFeyO3 Perovskite-Type Oxides.

ChemInform ◽  
1990 ◽  
Vol 21 (19) ◽  
Author(s):  
H. M. ZHANG ◽  
Y. SHIMIZU ◽  
Y. TERAOKA ◽  
N. MIURA ◽  
N. YAMAZOE
Keyword(s):  
Catalytic Properties ◽  
Oxygen Sorption ◽  
Perovskite Type

Tubular lanthanum cobaltite perovskite type membrane for oxygen permeation

2000 ◽  
Vol 166 (1) ◽  
pp. 51-61 ◽  
Author(s):  
Shiguang Li ◽  
Wanqin Jin ◽  
Pei Huang ◽  
Nanping Xu ◽  
Jun Shi ◽  
...  
Keyword(s):  
Oxygen Permeation ◽  
Lanthanum Cobaltite ◽  
Perovskite Type

Effect of thermoelectric material of Ca or Fe-doped LaCoO3

2018 ◽  
Vol 32 (19) ◽  
pp. 1840037
Author(s):  
Kei-Ichiro Murai ◽  
Shuhei Kori ◽  
Shun Nakai ◽  
Toshihiro Moriga
Keyword(s):  
Figure Of Merit ◽  
Solid Phase ◽  
X Ray Diffraction ◽  
Lanthanum Cobaltite ◽  
Iron Doped ◽  
Calcium Doped ◽  
Diffraction Patterns ◽  
Lanthanum Cobalt Oxide ◽  
Perovskite Type ◽  
Fe Substitution

As the Perovskite-type Lanthanum Cobalt Oxide of LaCoO3 is nontoxic and thermally stable even at high temperature, this material is expected as a candidate for thermoelectric applications. The thermoelectric performance of a material is often evaluated by the dimensionless figure-of-merit, ZT (=S[Formula: see text]T/[Formula: see text]), or S[Formula: see text] in the ZT equation. S[Formula: see text] shows the electrical characteristic as a Power factor (PF). It has been reported Seebeck coefficient of LaCoO3 is higher than other oxide materials at room temperature even though electrical conductivity and ZT are lower values. In this study, calcium-doped lanthanum cobaltite La[Formula: see text]Ca[Formula: see text]CoO3 (x = 0.00, 0.05, 0.10 and 0.15) and iron-doped lanthanum cobaltite LaCo[Formula: see text]Fe[Formula: see text]O3 (y = 0.05, 0.10 and 0.15) have been prepared by solid-phase process. The X-ray diffraction patterns of the calcium-doped samples and iron-doped samples show cubic perovskite structure. Electric conductivities were improved by Ca or Fe substitution and showed a tendency to increase with increasing the temperature. The sample substituted with Fe 5 mol.% showed the maximum PF, 0.510 ([Formula: see text] W/K2m) at 548 K, and the sample substituted with Ca 15 mol.% showed the maximum PF, 0.152 ([Formula: see text] W/K2m) at 498 K.

Structural investigation of the cubic perovskite-type doped lanthanum cobaltite La0.6Sr0.4CoO3−δat 1531 K: possible diffusion path of oxygen ions in an electrode material

2007 ◽  
Vol 40 (6) ◽  
pp. 1166-1168 ◽  
Author(s):  
Masatomo Yashima ◽  
Takayuki Tsuji
Keyword(s):  
Oxygen Deficiency ◽  
Diffusion Path ◽  
Atomic Displacement ◽  
Ion Migration ◽  
Lanthanum Cobaltite ◽  
Oxygen Ions ◽  
Density Mapping ◽  
Neutron Powder Diffraction Data ◽  
Atomic Displacement Parameters ◽  
Perovskite Type

The crystal structure of a cubic Pm\overline 3 m perovskite-type doped lanthanum cobaltite, La0.6Sr0.4CoO3−δ, has been studied usingin situneutron powder diffraction data measured at 1531 K. The refined occupancy 0.886 (6) of O atoms at the 3d1/2, 0, 0 site indicated an oxygen deficiency of δ = 0.34 (2) and an average valence of +2.7 for Co cations in La0.6Sr0.4CoO3−δat 1531 K. Refined anisotropic atomic displacement parameters and nuclear density mapping reveal that the oxygen ions in La0.6Sr0.4CoO3−δexhibit a large thermal motion perpendicular to the Co—O bond. A curved path for oxygen-ion migration between adjacent anion sites in La0.6Sr0.4CoO3−δis proposed, although it was not observed as a connected density in the experimental mapping.

scholarly journals Oxygen sorption-desorption properties and order–disorder transitions on La–Sr–Co–Fe perovskite-type oxides

2019 ◽  
Vol 127 (6) ◽  
pp. 378-382
Author(s):  
Tomoya KANEKO ◽  
Kohei NOSUE ◽  
Tomoki UCHIYAMA ◽  
Masaru NAGANO ◽  
Naoki ANKEI ◽  
...  
Keyword(s):  
Oxygen Sorption ◽  
Perovskite Type
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