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Title: Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-2Nb0.1Co0.9Oc-o perovskite cathodes

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Center for Functional Nanomaterials
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1165724
Report Number(s):
BNL-107132-2014-JA
R&D Project: 16060; KC0403020
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: RSC Advances; Journal Volume: 4; Journal Issue: 77
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY, AND ECONOMY; functional nanomaterials

Citation Formats

Zhu Y., Su D., Lin, Y., Shen, X., Sunarso, J., Zhou, W., Jiang, S., Chen, F., and Shao, Z.. Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-2Nb0.1Co0.9Oc-o perovskite cathodes. United States: N. p., 2014. Web. doi:10.1039/c4ra06191h.
Zhu Y., Su D., Lin, Y., Shen, X., Sunarso, J., Zhou, W., Jiang, S., Chen, F., & Shao, Z.. Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-2Nb0.1Co0.9Oc-o perovskite cathodes. United States. doi:10.1039/c4ra06191h.
Zhu Y., Su D., Lin, Y., Shen, X., Sunarso, J., Zhou, W., Jiang, S., Chen, F., and Shao, Z.. Thu . "Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-2Nb0.1Co0.9Oc-o perovskite cathodes". United States. doi:10.1039/c4ra06191h.
@article{osti_1165724,
title = {Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-2Nb0.1Co0.9Oc-o perovskite cathodes},
author = {Zhu Y. and Su D. and Lin, Y. and Shen, X. and Sunarso, J. and Zhou, W. and Jiang, S. and Chen, F. and Shao, Z.},
abstractNote = {},
doi = {10.1039/c4ra06191h},
journal = {RSC Advances},
number = 77,
volume = 4,
place = {United States},
year = {Thu Aug 21 00:00:00 EDT 2014},
month = {Thu Aug 21 00:00:00 EDT 2014}
}
  • Sr 0.95Nb 0.1Co 0.9O 3-δ(P4/mmm crystal structure), displaying a large JT distortion combined with charge-ordering of cobalt, shows improved ORR activity at low temperature, whereas Sr 0.98Nb 0.1Co 0.9O 3-δ(P4mm crystal structure), with a slight JT distortion, shows diminished performance.
  • BaLa{sub 4}Ti{sub 4}O{sub 15} crystallizes in the trigonal system (space group P{bar 3}c1) with the unit-cell parameters a = 5.5720(10) and c = 22.500(2) {angstrom}; Z = 2. The structure has been solved from single crystal X-ray diffraction data to a final R{sub 1} = 0.0336. Ba and La atoms are 12-fold coordinated and Ti atoms are 6-fold coordinated. The structure can be described as consisting of identical perovskite-like blocks, four corner-sharing TiO{sub 6} octahedra thick, separated by layers of vacant octahedra. The distortion of the cation and anion sublattices has been analyzed and a Ba/La order has been observed.
  • A new ordered oxygen-deficient perovskite, LaBaMn{sub 2}O{sub 5.5}, has been synthesized, using the topotactic deoxygenation of the ordered LaBaMn{sub 2}O{sub 6} perovskite. The crystal structure of this manganite was solved in the space group Ammm (a = 3.86 {angstrom}, b = 8.19 {angstrom}, c = 15.47 {angstrom}) from neutron powder diffraction data. The [Mn{sub 2}O{sub 5.5}]{sub {infinity}} framework is built up of row of MnO{sub 6} octahedra and MnO{sub 5} pyramids running along {rvec a}. This structure is intermediate between that of the ordered LaBaMn{sub 2}O{sub 6} perovskite and that of LaBaMn{sub 2}O{sub 5}: it consists of ordered barium andmore » lanthanum layers stacked alternatively along {rvec c}, oxygen vacancies being located at the level of the La layers. The magnetic structure is original: manganese spins form ferromagnetic spin-ladders along the {rvec b} axis that are antiferromagnetically coupled along the {rvec a} and {rvec c} axis. The HREM investigation shows the existence of 90{degree} oriented domains and twinning phenomena.« less
  • A new layered perovskite Sr{sub 2}Al{sub 0.78}Mn{sub 1.22}O{sub 5.2} has been synthesized by solid state reaction in a sealed evacuated silica tube. The crystal structure has been determined using electron diffraction, high-resolution electron microscopy, and high-angle annular dark field imaging and refined from X-ray powder diffraction data (space group P4/mmm, a=3.89023(5) A, c=7.8034(1) A, R{sub I}=0.023, R{sub P}=0.015). The structure is characterized by an alternation of MnO{sub 2} and (Al{sub 0.78}Mn{sub 0.22})O{sub 1.2} layers. Oxygen atoms and vacancies, as well as the Al and Mn atoms in the (Al{sub 0.78}Mn{sub 0.22})O{sub 1.2} layers are disordered. The local atomic arrangement inmore » these layers is suggested to consist of short fragments of brownmillerite-type tetrahedral chains of corner-sharing AlO{sub 4} tetrahedra interrupted by MnO{sub 6} octahedra, at which the chain fragments rotate over 90 deg. This results in an averaged tetragonal symmetry. This is confirmed by the valence state of Mn measured by EELS. The relationship between the Sr{sub 2}Al{sub 0.78}Mn{sub 1.22}O{sub 5.2} tetragonal perovskite and the parent Sr{sub 2}Al{sub 1.07}Mn{sub 0.93}O{sub 5} brownmillerite is discussed. Magnetic susceptibility measurements indicate spin glass behavior of Sr{sub 2}Al{sub 0.78}Mn{sub 1.22}O{sub 5.2}. The lack of long-range magnetic ordering contrasts with Mn-containing brownmillerites and is likely caused by the frustration of interlayer interactions due to presence of the Mn atoms in the (Al{sub 0.78}Mn{sub 0.22})O{sub 1.2} layers. - Graphical abstract: In contrast to Sr{sub 2}Al{sub 1.07}Mn{sub 0.93}O{sub 5}, the local atomic arrangement in these layers consist of short fragments of brownmillerite-type tetrahedral chains of corner-sharing AlO{sub 4} tetrahedra interrupted by MnO{sub 6} octahedra, at which the chain fragments rotate over 90 deg. When derived by bulk structure determination techniques such as X-ray powder diffraction, the structure will be described with an averaged tetragonal symmetry.« less