Hierarchical layered double hydroxide nanocomposites: structure, synthesis and applications

Gu, Zi; Atherton, J.; Xu, Zhi Ping

doi:10.1039/c4cc07715f

Cited by 336 publications

(185 citation statements)

References 129 publications

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“…Their main use is in catalysis, they can act as support for catalysts, catalyst precursors or they can be the actual catalysts (e.g., Xu et al, 2011;He et al, 2013;Fan et al, 2014;Sipiczki et al, 2015). Other fields of applications are environmental (e.g., Shin et al, 1996;Zümreoglu-Karan and Ay, 2012;Liang et al, 2013), pharmaceutical (e.g., Choy et al, 2007;Costantino et al, 2008;Ladewig et al, 2009;Oh et al, 2009;Rives et al, 2014;Gu et al, 2015), cosmetic (e.g., Yang et al, 2003;Perioli et al, 2006), etc.…”

Section: Introductionmentioning

confidence: 98%

Optimisation of the synthesis parameters of mechanochemically prepared CaAl-layered double hydroxide

Ferencz

Kukovecz

Kónya

et al. 2015

Applied Clay Science

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a b s t r a c tIn this work, not so commonly used methods, manual grinding and milling, were applied in an attempt of preparing phase-pure CaAl-LDH (CaAl-layered double hydroxide). For manual grinding a mortar and a pestle and the components with some added water or NaOH solution were used. Milling was a two-step procedure: dry milling was followed by milling in the presence of minute (and controlled) amount of water. The thus prepared samples were characterised by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). It was proven that even though manual grinding did produce LDH, only mechanochemical energy provided by the two-step milling procedure was able to transform the precursors nearly completely to CaAl-LDH. Optimisation of the milling parameters could reproducibly lead to close-to-phase-pure CaAl-LDH.

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Section: Introductionmentioning

confidence: 98%

Optimisation of the synthesis parameters of mechanochemically prepared CaAl-layered double hydroxide

Ferencz

Kukovecz

Kónya

et al. 2015

Applied Clay Science

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“…LDHs are a class of twodimensional (2D) materials with unique structure consisting of metal hydroxide layers and inorganic/organic gallery anions/molecules. [12][13][14][15][16] The general formula of LDHs can be respectively, and A n-is a charge-balancing anion intercalated between the brucite-like metal hydroxide layers. The easily tailored properties, composition versatility, and low cost of LDHs have led to surging interest in these materials and many applications, such as adsorption, 16,17 photochemistry, 14,18,19 and electrocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Porous Two-Dimensional Nanosheets Converted from Layered Double Hydroxides and Their Applications in Electrocatalytic Water Splitting

et al. 2015

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Porous materials are of particular interest due to their high surface area and rich edge sites, which are favorable for applications such as catalysis. Although there are well-established strategies for synthesizing porous metal oxides (e.g. by annealing the corresponding metal hydroxides), facile and scalable routes to porous metal hydroxides and metal chalcogenides are lacking. Here, we report a simple and general strategy to synthesize porous nanosheets of metal hydroxides by selectively etching layered double hydroxide (LDH) nanoplate precursors that contain amphoteric metal, and to further convert them into porous metal chalcogenides by a solution method. Using NiGa LDH as an example, we show that the thin nanoplates with high surface accessibility facilitate the topotactic conversion of NiGa LDH to β-Ni(OH) 2 and further to NiSe 2 with porous texture while preserving the sheet-like morphology. The converted β-Ni(OH) 2 and NiSe 2 are highly active for electrocatalytic oxygen evolution reaction and hydrogen evolution reaction (HER), respectively, which demonstrates the applications of such high surface area porous nanostructures with rich edge sites. Particularly, the porous NiSe 2 nanosheets exhibited excellent catalytic activity toward HER with low onset overpotential, small Tafel slope, and good stability under both acidic and alkaline conditions. Overall electrochemical water splitting experiments using these porous β-Ni(OH) 2 and NiSe 2 nanosheets were further demonstrated. Our work presents a new strategy to prepare porous nanomaterials, and to further enhance their catalytic and other applications.

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“…Also, it is possible to use this kind of textile in clothing because it has a low cost, high mechanical strength, good chemical resistance, water washability, reliability in quality, and commercial availability. [48][49][50] The Ni-Co LDH nanostructures can be synthesized by different growth methods, such as hydrothermal synthesis, electrochemical deposition (ED), microwave-assisted method, chemical bath deposition, and solvothermal method, etc. [36][37][38][39][40] Up to now, various binary metal oxides/hydroxides and layered double hydroxide (LDH) nanostructures including ZnCo 2 O 4 , NiCo 2 O 4 , FeCo 2 O 4 , Ni-Al, Co-Al, and Ni-Co have been proven as promising electroactive materials for pseudocapacitors.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Ni–Co layered double hydroxide nanosheets entrapped on conductive textile fibers: a cost-effective and flexible electrode for high-performance pseudocapacitors

2016

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Hierarchical three-dimensional (3D) porous nanonetworks of nickel-cobalt layered double hydroxide (Ni-Co LDH) nanosheets (NSs) are grown and decorated on flexible conductive textile substrate (CTs) via a simple two-electrode system based electrochemical deposition (ED) method. By applying a proper external cathodic voltage of -1.2 V for 15 min, the Ni-Co LDH NSs are densely deposited over the entire surface of the CTs with good adhesion. The flexible Ni-Co LDH NSs on CTs (Ni-Co LDH NSs/CTs) architecture with high porosity facilitates enhanced electrochemical performance in 1 M KOH electrolyte solution. The effect of growth concentration and external cathodic voltage on the electrochemical properties of Ni-Co LDH NSs/CTs is also investigated. The Ni10Co5 LDH NSs/CTs electrode exhibits a high specific capacitance of 2105 F g(-1) at a current density of 2 A g(-1) as well as an excellent cyclic stability as a pseudocapacitive electrode due to the advantageous properties of 3D interconnected porous frameworks of Ni10Co5 LDH NSs/CTs. This facile fabrication of bimetallic hydroxide nanostructures on CTs can provide a promising electrode for low-cost energy storage device applications.

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Hierarchical layered double hydroxide nanocomposites: structure, synthesis and applications

Cited by 336 publications

References 129 publications

Optimisation of the synthesis parameters of mechanochemically prepared CaAl-layered double hydroxide

Optimisation of the synthesis parameters of mechanochemically prepared CaAl-layered double hydroxide

Porous Two-Dimensional Nanosheets Converted from Layered Double Hydroxides and Their Applications in Electrocatalytic Water Splitting

Hierarchical Ni–Co layered double hydroxide nanosheets entrapped on conductive textile fibers: a cost-effective and flexible electrode for high-performance pseudocapacitors

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