Electrochemical oxygen intercalation in La2CuO4 prepared by nitrates method: Microstructural effects

Michel, Carlos R.; Pastor, Nieves Casañ

doi:10.1016/s0921-4534(00)01178-3

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Numerous studies have been reported on the successful production of the most essential and catalytically active perovskite. La 2 CuO 4 have been produced through solid-state reaction, sol-gel, co-precipitation methods, demonstrating the reliance of catalytic activity of the La 2 CuO 4 [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Co 2+ substituted La 2 CuO 4 nanoparticles: Structural, morphological, optical and magnetic behaviour

Dash,

Yuvaraj,

Jothiramalingam

et al. 2024

Preprint

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Impact of Co2+ doping on the properties of the structural, magnetic, functional and optical of La2CuO4 system formed by combustion process. Every sample of lanthanum cuprate was examined. The development of single-phase orthorhombic crystals with a Bmab space group was verified by X-ray diffraction patterns. The monophasic orthorhombic lattice structure of the material has crystallite size that falls between 28 and 41 nm. The lattice constant falls between a = 5.361 Å − 5.349 Å, b = 5.410 Å − 5.399 Å & c = 13.160 Å − 13.148 Å. The XRD of La2CuO4 perovskite nanomaterials correspond well with the calculated ones, with χ2 values closer to 1. Energy gap values decreases from 1.75 to 1.68 eV due to the quantum confinement. The hysteresis curves recorded at 300 K show that coercivity ranges from 210.09 to 177.37 Oe as the content decreases, confirming that the crystallite size increase. The samples were with soft ferromagnetic behavior found in the VSM study.

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Section: Introductionmentioning

confidence: 99%

Effect of Co 2+ substituted La 2 CuO 4 nanoparticles: Structural, morphological, optical and magnetic behaviour

Dash,

Yuvaraj,

Jothiramalingam

et al. 2024

Preprint

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“…Until now, little has been published. [11][12][13] This study deals with the behavior of the ''model material'' La 2 CuO 4 whose electronic properties, especially the superconductivity that strongly depends on oxygen overstoichiometry, have been well characterized.…”

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confidence: 99%

Room-Temperature Electrochemical Intercalation of Oxygen or Fluorine into La[sub 2]CuO[sub 4] Using Organic Electrolytic Media: Mechanistic Approach

Delville

Barbut

Wattiaux

et al. 2004

J. Electrochem. Soc.

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The electrochemical intercalation of oxygen into La 2 CuO 4 has been studied in various anhydrous organic media. Several combinations between an organic solvent and a supporting electrolyte have been examined. The addition of an oxygen source such as KO 2 or H 2 O has been found to be unnecessary. Experiments have shown that the electrochemical oxygen insertion mainly implies the decomposition of the solvent leading to the formation of oxygen species able to oxidize the starting material. La 2 CuO 4.10 has been prepared in the DMSO associated with nBu 4 NClO 4 . A superconducting behavior is observed below 44 K and the physical characterizations of the material before and after controlled anodic polarization are reported. It has also been shown that this intercalation reaction is reversible. The mechanism of the oxygen intercalation is tentatively proposed with respect to the organic media. Fluorine has also been intercalated for the first time in such media.Oxides showing high oxidation states of metal cations are usually prepared at high temperatures under high oxygen pressures, which gives the thermodynamically stable form of the compound. Preparing such oxides at lower temperatures ͑20-300°C͒ requires reactions of ''Chimie Douce''-type, 1 often leading to metastable compounds. Besides the use of highly oxidizing reagents, 2,3 electrochemical processes have been used and many studies have shown that the use of the electric field as the driving force for redox reactions can be very beneficial in solid-state chemistry for preparing new materials at about room temperature, as for instance in the field of batteries. Initiated for the first time in 1989, the electrochemical oxidation appeared as an efficient ''Chimie Douce'' technique for intercalating oxygen into oxide host networks. 4 It is carried out in air, at room temperature, in alkaline media, and allows preparing noteworthy materials, some having never been obtained with classic synthesis routes used in solid-state chemistry.In alkaline solution, in the vicinity of the oxygen evolution, under anodic potentials, a very high oxygen activity can be obtained at the electrode surface according toOn metallic electrodes, such a reaction competes with the formation of oxide thin films ͑i.e., Al 2 O 3 , ZnO, CuO, TiO 2 ,...) 5 whereas on appropriate oxide electrodes such as A x M m O y 1 not only the surface is affected but also the bulk. When analyzed in electrochemistry, these materials present (i, E) curves which exhibit a typical plateau at potentials lower than that corresponding to oxygen evolution, which is the signature of an oxidation process according towhere A is an alkaline-earth or a lanthanide ion and M a 3d transition metal and 2␦ ϭ the number of exchanged electrons corresponding to the amount of oxidized metal cations (Cu 3ϩ for La 2 CuO 4 ). 6 Various oxides have thus been prepared and characterized, 1 some of them exhibiting quite original properties such as superconductivity for La 2 CuO 4.09 , 7 charge density ordering in La 2 NiO 4.25 , 8 ferro...

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Bacterial cellulose-assisted hydrothermal synthesis and catalytic performance of La2CuO4 nanofiber for methanol steam reforming

Yang

Tang

Liu

et al. 2013

International Journal of Hydrogen Energy

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Electrochemical oxygen intercalation in La2CuO4 prepared by nitrates method: Microstructural effects

Cited by 3 publications

References 3 publications

Effect of Co 2+ substituted La 2 CuO 4 nanoparticles: Structural, morphological, optical and magnetic behaviour

Effect of Co 2+ substituted La 2 CuO 4 nanoparticles: Structural, morphological, optical and magnetic behaviour

Room-Temperature Electrochemical Intercalation of Oxygen or Fluorine into La[sub 2]CuO[sub 4] Using Organic Electrolytic Media: Mechanistic Approach

Bacterial cellulose-assisted hydrothermal synthesis and catalytic performance of La2CuO4 nanofiber for methanol steam reforming

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