Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

Pang, Xiujiang; Chen, Li; Liu, Yuan; Chi, Mingjun; Li, Zaifeng; Plank, Johann

doi:10.1039/c7ra00833c

Cited by 14 publications

(6 citation statements)

References 36 publications

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“…We speculate that this is the dominant mechanism in concentrated, rapidly mixed conditions and may be a significant crystallization pathway during aging. This confirms the previous studies that have suggested an OA mechanism 24 , 29 in addition to Ostwald ripening, a slow dissolution, and recrystallization process 22 , 50 .…”

Section: Resultssupporting

confidence: 92%

“…The correlation between aspect ratio and height indicates that the particles assemble in an ordered manner, which directly verifies previous studies that have suggested that LDH particles may preferentially orient epitaxially, edge-to-edge 45 and face-to-face 24 . More interestingly, the non-monotonic dependence of aspect ratio and shear suggests that shear not only influences the kinetics of OA but also has competing effects that enhance or decrease particle anisotropy.…”

Section: Resultssupporting

confidence: 88%

“…Colloidal LDH is synthesized via hydrothermal treatment or co-precipitation, usually followed by thermal aging to improve crystallinity 21 . The crystallization process is not well understood and is thought to proceed via local dissolution and crystallization of amorphous LDH 22 , 23 or via the physical rearrangement of nanocrystalline domains 24 , 25 . Surfactant-assisted methods 26 and continuous flow reactors have recently been used to generate monolayer LDH nanoplatelets 27 – 29 , though the control of particle size, crystallinity, and thickness remains difficult.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic assembly of two-dimensional layered double hydroxide nanostructures

2018

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Formation mechanisms of two-dimensional nanostructures in wet syntheses are poorly understood. Even more enigmatic is the influence of hydrodynamic forces. Here we use liquid flow cell transmission electron microscopy to show that layered double hydroxide, as a model material, may form via the oriented attachment of hexagonal nanoparticles; under hydrodynamic shear, oriented attachment is accelerated. To hydrodynamically manipulate the kinetics of particle growth and oriented attachment, we develop a microreactor with high and tunable shear rates, enabling control over particle size, crystallinity and aspect ratio. This work offers new insights in the formation of two-dimensional materials, provides a scalable yet precise synthesis method, and proposes new avenues for the rational engineering and scalable production of highly anisotropic nanostructures.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic assembly of two-dimensional layered double hydroxide nanostructures

2018

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“…10,11 The reversible electrostatic adsorption /desorption on the electrode surface is used to store the charge. 12 By arrangement of the opposite sign charge an electric double layer is formed in the vicinity of the electrode/electrolyte interface, a so-called "electric double layer capacitor".…”

mentioning

confidence: 99%

Investigation of the Electrochemical Properties of CoAl-Layered Double Hydroxide/Ni(OH)₂

Musharavati

Sun

et al. 2018

J. Electrochem. Soc.

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Layered double hydroxides (LDH) as active electrode materials have become the focus of research in energy storage applications. The manufacturing of excellent electrochemical performance of the LDH electrode is still a challenge. In this paper, the production of CoAl-LDH@Ni(OH) 2 is carried out in two steps, including hydrothermal and electrodeposition techniques. The prominent features of this electrode material are shown in the structural and morphological aspects, and the electrochemical properties are investigated by improving the conductivity and cycle stability. The core of this experimental study is to investigate the properties of the materials by depositing different amounts of nickel hydroxide and changing the loading of the active materials. The experimental results show that the specific capacity is 1810.5F · g −1 at 2 A/g current density and the cycle stability remained at 76% at 30 A g −1 for 3000 cycles. Moreover, a solid-state asymmetric supercapacitor with CoAl-LDH@Ni(OH) 2 as the positive electrode and multi-walled carbon nanotube coated on the nickel foam as the negative electrode delivers high energy density (16.72 Wh kg −1 at the power density of 350.01 W kg −1 ). This study indicates the advantages of the design and synthesis of layered double hydroxides, a composite with excellent electrochemical properties that has potential applications in energy storage. Supercapacitors (SCs) are currently of widespread interest in energy storage, which has become a research area due to the development of various energy storage devices, long cycle life, high power density, high safety, and low maintenance costs. Numerous studies have concentrated on the enhancing the performance of the electrode material. Electrochemical capacitors (ECs), also known as supercapacitors, 1,2 are a new type of energy storage device that have been developed in recent years. Typically, according to the charge storage mechanism of different electrode materials, 3-5 the use of supercapacitors can be divided into two categories including the electric double layer capacitor (EDLC), Faraday pseudocapacitor and hybrid supercapacitor.6-9 The electric double layer capacitor uses high surface area carbon as the electrode material, while the Faraday pseudocapacitor uses a transition metal oxide or a conductive polymer as an electrode material.The electric double layer capacitor is a new capacitor which is based on the interface of the double layer theory.10,11 The reversible electrostatic adsorption /desorption on the electrode surface is used to store the charge.12 By arrangement of the opposite sign charge an electric double layer is formed in the vicinity of the electrode/electrolyte interface, a so-called "electric double layer capacitor".13,14 Its working principle is: the electrode surface and solution on both sides of the electrolyte solution appear on the opposite sides of the excess charge.Hydrotalcite-like layered clays, also well-known LDH, 15-18 have been extensively explored in the field of catalysts and catalyst supports...

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“…The Mg 2 Al-LDH platelets grow both in diameter and in thickness while dispersed in water, which is a result of particle agglomeration and Ostwald ripening. 28,29 The PVA polymer chains may act as particle growth inhibitors attaching to the surface of an LDH platelet. Thus, in a mixed Mg 2 Al-LDH NS/PVA dispersion, the aspect ratio of the Mg 2 Al-LDH NS is stable.…”

Section: Materials Horizons Communicationmentioning

confidence: 99%

Aged layered double hydroxide nanosheet–polyvinyl alcohol dispersions for enhanced gas barrier coating performance

Chen

Gilchrist

et al. 2021

Mater. Horiz.

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Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

Abstract: A diagram divided into three regions was made to determine the state of LDH nanosheets in aqueous phase.

Cited by 14 publications

References 36 publications

Hydrodynamic assembly of two-dimensional layered double hydroxide nanostructures

Hydrodynamic assembly of two-dimensional layered double hydroxide nanostructures

Investigation of the Electrochemical Properties of CoAl-Layered Double Hydroxide/Ni(OH)₂

Aged layered double hydroxide nanosheet–polyvinyl alcohol dispersions for enhanced gas barrier coating performance

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Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

Abstract: A diagram divided into three regions was made to determine the state of LDH nanosheets in aqueous phase.

Cited by 14 publications

References 36 publications

Hydrodynamic assembly of two-dimensional layered double hydroxide nanostructures

Hydrodynamic assembly of two-dimensional layered double hydroxide nanostructures

Investigation of the Electrochemical Properties of CoAl-Layered Double Hydroxide/Ni(OH)2

Aged layered double hydroxide nanosheet–polyvinyl alcohol dispersions for enhanced gas barrier coating performance

Contact Info

Product

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Investigation of the Electrochemical Properties of CoAl-Layered Double Hydroxide/Ni(OH)₂