Novel oxygen storage mechanism based on redox of sulfur in lanthanum oxysulfate/oxysulfide

Machida, Masato; Kawamura, Kiyotaka; Ito, Kazuhiro

doi:10.1039/b315839j

Cited by 33 publications

(33 citation statements)

References 8 publications

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“…Since the sulfate ion is (4) 102.4(4) 108.1 (4) 107.7(4) 102.2 (1) 102.8(4) 126. 6(4) 126.6(4) 119.9 (4) 121 the most stable state of sulfur species, an appropriate reducing agent is necessary for the phase transformation of oxysulfate to oxysulfide.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous studies, we have demonstrated the largecapacity oxygen storage of lanthanide oxysulfates, Ln 2 O 2 SO 4 , which uses sulfur as the redox center instead of metallic cations [1][2][3]. The reduction by H 2 , CO or hydrocarbons and subsequent reoxidation by O 2 between Ln 2 O 2 SO 4 (S 6+ ) and Ln 2 O 2 S (S 2− ) achieved the oxygen storage equivalent to 2 mol of O 2 per mol of the compound, which is eight times larger than that of the conventional CeO 2 -ZrO 2 materials.…”

Section: Introductionmentioning

confidence: 99%

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X-ray structural study on the different redox behavior of La and Pr oxysulfates/oxysulfides

Ikeue

Kawano

Eto

et al. 2008

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

X-ray structural study on the different redox behavior of La and Pr oxysulfates/oxysulfides

Ikeue

Kawano

Eto

et al. 2008

Journal of Alloys and Compounds

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“…Rare earth oxysulfate (RE 2 O 2 SO 4 ) have aroused great interest in recent years due to the unique magnetic23 and luminescent properties2425 as well as significant applications in large volume oxygen storage2627. RE 2 O 2 SO 4 is also an important matrix compound for luminescent rare-earth ions to fabricate downconversion (DC) or upconversion (UC) phosphors due to the incompletely filled 4 f electron shell of rare-earth ions282930.…”

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confidence: 99%

Controllable Fabrication and Optical Properties of Uniform Gadolinium Oxysulfate Hollow Spheres

Chen

Liu

et al. 2015

Sci Rep

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Uniform gadolinium oxysulfate (Gd2O2SO4) hollow spheres were successfully fabricated by calcination of corresponding Gd-organic precursor obtained via a facile hydrothermal process. The Gd2O2SO4 hollow spheres have a mean diameter of approximately 550 nm and shell thickness in the range of 30–70 nm. The sizes and morphologies of as-prepared Gd2O2SO4 hollow spheres could be deliberately controlled by adjusting the experimental parameters. Eu-doped Gd2O2SO4 hollow spheres have also been prepared for the property modification and practical applications. The structure, morphology, and properties of as-prepared products were characterized by XRD, TEM, HRTEM, SEM and fluorescence spectrophotometer. Excited with ultraviolet (UV) pump laser, successful downconversion (DC) could be achieved for Eu-doped Gd2O2SO4 hollow spheres.

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“…-and S 2-has recently been reported forLa 2 O 2 SO 4 , La 2 O 2 SO 4 + 4H 2 ↔ La 2 O 2 S + 4H 2 O, pro-viding a convenient oxygen storage medium 45. 2.3 Crystal field theoryCrystal field theory constitutes a corner-stone of inorganic chemistry that provided the basis for understanding several aspects of transition metal chemistry:…”

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confidence: 99%

Quest for new materials: Inorganic chemistry plays a crucial role

Gopalakrishnan

Ramanathan

2009

J Chem Sci

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There is an endless quest for new materials to meet the demands of advancing technology. Thus, we need new magnetic and metallic/semiconducting materials for spintronics, new low-loss dielectrics for telecommunication, new multi-ferroic materials that combine both ferroelectricity and ferromagnetism for memory devices, new piezoelectrics that do not contain lead, new lithium containing solids for application as cathode/anode/electrolyte in lithium batteries, hydrogen storage materials for mobile/transport applications and catalyst materials that can convert, for example, methane to higher hydrocarbons, and the list is endless! Fortunately for us, chemistry -inorganic chemistry in particular -plays a crucial role in this quest. Most of the functional materials mentioned above are inorganic non-molecular solids, while much of the conventional inorganic chemistry deals with isolated molecules or molecular solids. Even so, the basic concepts that we learn in inorganic chemistry, for example, acidity/basicity, oxidation/reduction (potentials), crystal field theory, low spin-high spin/inner sphere-outer sphere complexes, role of d-electrons in transition metal chemistry, electron-transfer reactions, coordination geometries around metal atoms, Jahn-Teller distortion, metal-metal bonds, cation-anion (metal-nonmetal) redox competition in the stabilization of oxidation states -all find crucial application in the design and synthesis of inorganic solids possessing technologically important properties. An attempt has been made here to illustrate the role of inorganic chemistry in this endeavour, drawing examples from the literature as well as from the research work of my group.

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Novel oxygen storage mechanism based on redox of sulfur in lanthanum oxysulfate/oxysulfide

Abstract: A sulfur redox cycle between La(2)O(2)SO(4)(S(6+)) and La(2)O(2)S(S(2-)) phases was found for the first time to achieve the oxygen storage of 2 mol O(2) mol(-1), which is eight times larger than that of the conventional CeO(2)-ZrO(2) system.

Cited by 33 publications

References 8 publications

X-ray structural study on the different redox behavior of La and Pr oxysulfates/oxysulfides

X-ray structural study on the different redox behavior of La and Pr oxysulfates/oxysulfides

Controllable Fabrication and Optical Properties of Uniform Gadolinium Oxysulfate Hollow Spheres

Quest for new materials: Inorganic chemistry plays a crucial role

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