Preparation of Co–Al layered double hydroxides by the hydrothermal urea method for controlled particle size

Arai, Yuki; Ogawa, Makoto

doi:10.1016/j.clay.2008.04.011

Cited by 70 publications

(35 citation statements)

References 16 publications

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“…The basal spacing values -d (003), the distance between cations (a) and the unit cell height (c) were calculated using a Peakfit software, version 4, and are shown in the Table 1. It was observed in this Table that the highest diffraction peak correspondent to the plan 003 represents the d value relative to the sum of the lamellae thickness and the interlamellar region height, and may range between 7.6 and 7.8 Å, depending on the degree of hydration of the material [16][17][18] . Hydrocalcite parameter c corresponds to the unit cell height, whereas parameter a is attributed to the distance between the cations on the calcite-type layer.…”

Section: Resultsmentioning

confidence: 99%

“…In the XRD of the Figure 4 it observes among the synthesized LDH from the cathodic material those obtained by precipitation at pH 11 with LiOH presented structure similar to the synthesized Co-Al-Cl LDH by the co-precipitation method at constant pH 8 (LDH pattern) 15 . The synthesized LDH by the method described in this paper presented diffraction peaks centered at 11.66°, 23.38°, 34.56°, 46.66° and 60.16° which correspond to reflections 003, 006, 010, 018 and 110 according to the literature 16,17 . The basal spacing values -d (003), the distance between cations (a) and the unit cell height (c) were calculated using a Peakfit software, version 4, and are shown in the Table 1.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Co-Al-Cl LDH by cathodic material reprocessing from cellular phone batteries

et al. 2014

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The aim of this paper was the recovering of the cathodic material from discarded lithium ion batteries for obtainment of the lamellar double hydroxides (LDHs) by the co-precipitation method at variable pH in HCl and H 2 O 2 1:1 (v/v) acid solution containing Co and Al (extracted from cathodic material composed of LiCoO 2 and aluminum foil). These metals were precipitated in LiOH at pH 9 or 11, or NH 4 OH at pH 9 and submitted to the hydrothermal treatment (HT) to improve the structural organization of the LDHs lamellae. After precipitation, the resulting solids were structurally characterized by XRD for phase identification and calculation of the unit cell parameter, thermally by TGA for the identification of the mass loss and morphologically by SEM. The sample obtained by precipitation with LiOH at pH 11 / hydrothermal treatment showed diffraction peaks similar to hydrotalcite, morphological and thermal characteristics similar to the pattern Co-Al-Cl LDH obtained by co-precipitation at constant pH 8. Keywords: lithium ion batteries, LiCoO 2 and aluminum foil recovering, reprocessing of cellular phone battery and lamellar double hydroxides

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis of Co-Al-Cl LDH by cathodic material reprocessing from cellular phone batteries

et al. 2014

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“…8 At present, LDH nanoparticles can be tailored with the hydrodynamic diameter from 30-40 nm to 5-10 mm using various hydrothermal treatment methods. [9][10][11] In addition, through various delamination or top down methods, single-layer LDH nanosheets can be prepared, with the lateral size from 20 nm to several micrometres. 12 Due to their rich ionic surface -OH group and the inherent positive charge, LDH nanoparticles or nanosheets can interact with other nanomaterials or polymeric molecules, generating 3D nanocomposites with particular architectures.…”

Section: John J Athertonmentioning

confidence: 99%

Hierarchical layered double hydroxide nanocomposites: structure, synthesis and applications

2015

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a Layered double hydroxide (LDH)-based nanocomposites, constructed by interacting LDH nanoparticles with other nanomaterials (e.g. silica nanoparticles and magnetic nanoparticles) or polymeric molecules (e.g. proteins), are an emerging yet active area in healthcare, environmental remediation, energy conversion and storage.Combining advantages of each component in the structure and functions, hierarchical LDH-based nanocomposites have shown great potential in biomedicine, water purification, and energy storage and conversion.This feature article summarises the recent advances in LDH-based nanocomposites, focusing on their synthesis, structure, and application in drug delivery, bio-imaging, water purification, supercapacitors, and catalysis.

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“…Among these metals, Al is an attractive candidate to synthesize a stabilized structure due to its trivalent nature. 9,10 Arai et al prepared Co-Al layered double hydroxides by the hydrothermal method, 11 but the electrochemical performances of the product are not investigated. Wang et al synthesized Co-Al LDHs by separating nucleation and aging steps, and the specific capacitance of 684 F•g -1 was observed.…”

Section: Introductionmentioning

confidence: 99%

Layered Al‐substituted Cobalt Hydroxides/GO Composites for Electrode Materials of Supercapacitors

Chen

Chang

et al. 2011

Chin. J. Chem.

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In this work, Al-substituted α-Co(OH) 2 /GO composites with supercapacitive properties were prepared by chemical co-precipitated method in which cobalt nitrate and aluminum nitrate were used as the raw material, and graphite oxide was employed as carrier. The as-prepared materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and fourier transform infrared spectroscopy (FT-IR). Cyclic voltammetry (CV) and galvanostatic charge/discharge measurements showed that the Al-substituted α-Co(OH) 2 /GO electrode material had excellent electrochemical capacitance. The specific capacitance of 1137 F•g -1 was achieved in 6 mol/L KOH solution at a current density of 1 A•g -1 within a potential range of 0-0.5 V. Moreover, only 12% losses of the initial specific capacitance were found after 500 cycles at a current density of 1 A•g -1 .

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Preparation of Co–Al layered double hydroxides by the hydrothermal urea method for controlled particle size

Cited by 70 publications

References 16 publications

Synthesis of Co-Al-Cl LDH by cathodic material reprocessing from cellular phone batteries

Synthesis of Co-Al-Cl LDH by cathodic material reprocessing from cellular phone batteries

Hierarchical layered double hydroxide nanocomposites: structure, synthesis and applications

Layered Al‐substituted Cobalt Hydroxides/GO Composites for Electrode Materials of Supercapacitors

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