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layered double hydroxide

Yuzhu Xue, Zhiyu Ren, Ying Xie, Shichao Du, Jun Wu, Huiyuan Meng, Honggang Fu
Manipulating the electrical conductivity and morphology of Co-based (hydr)oxides is significant for optimizing energy conversion in the oxygen evolution reaction (OER). Herein, 2D CoSex nanocrystalline-dotted porous CoCo layered double hydroxide nanosheets (Co-Se NSs) were designed and synthesized via a modified in situ reduction and interface-directed assembly in an inert atmosphere. During the synchronous reduction/precipitation reaction between Co(2+)-oleylamine and NaHSe at the toluene-water interface, the hydrated Co-O and Co-Se clusters are generated and sequentially assemble under strong extrusion driven by the interfacial tension...
October 18, 2017: Nanoscale
Mina Yan, Chanzhen Yang, Binyao Huang, Zeqian Huang, Liangfeng Huang, Xuefei Zhang, Chunshun Zhao
Layered double hydroxide (LDH) nanoparticles are emerging as one of the promising nanomaterials for biomedical applications, but their systemic toxicity in vivo has received little attention. In the present study, the effects of inorganic nanoparticle aggregation on their systemic toxicity were examined. Remarkably, aggregation was observed after the mixing of naked LDH nanoparticles with saline or erythrocytes. Significant accumulation of the naked LDH nanoparticles in the lungs of mice was detected 1 h after intravenous administration, and the survival rate of mice was 0% after 6 repeated injections...
2017: International Journal of Nanomedicine
Peng Zhou, Yanyong Wang, Chao Xie, Chen Chen, Hanwen Liu, Ru Chen, Jia Huo, Shuangyin Wang
Water splitting is promising for energy storage and conversion, but the sluggish oxygen evolution reaction (OER) hinders its wide application. The search for efficient and low-cost electrocatalysts for oxygen evolution has been pursued owing to their significance for green energy generation and storage. Layered Double Hydroxide (LDH) based materials are promising for the OER to improve this weakness. However, the wide application of LDHs is limited by their electronic properties and active sites. Here we report a simple and promising method to improve the OER catalytic activity via an acid-base reaction, which resulted in an exfoliation process and multiple defects including Co, Fe and O vacancies...
October 16, 2017: Chemical Communications: Chem Comm
Friedrich Waag, Bilal Gökce, Chakrapani Kalapu, Georg Bendt, Soma Salamon, Joachim Landers, Ulrich Hagemann, Markus Heidelmann, Stephan Schulz, Heiko Wende, Nils Hartmann, Malte Behrens, Stephan Barcikowski
Highly active, structurally disordered CoFe2O4/CoO electrocatalysts are synthesized by pulsed laser fragmentation in liquid (PLFL) of a commercial CoFe2O4 powder dispersed in water. A partial transformation of the CoFe2O4 educt to CoO is observed and proposed to be a thermal decomposition process induced by the picosecond pulsed laser irradiation. The overpotential in the OER in aqueous alkaline media at 10 mA cm(-2) is reduced by 23% compared to the educt down to 0.32 V with a Tafel slope of 71 mV dec(-1)...
October 13, 2017: Scientific Reports
Yanna Wang, Liguang Dou, Hui Zhang
A series of novel nanosheet array-like catalysts Pdx/rGO@CoAl-LDH (x = 0.0098 - 1.9, refers to Pd loading in wt% on ICP, rGO: reduced graphene oxide, LDH: layered double hydroxide) were first prepared via a simple and green lattice atomic-confined in situ reduction of oxidative Pd precursors by the evenly atomic-dispersed reductive Co2+ sites on LDH layers of a nanohybrid rGO@CoAl-LDH with hexagonal LDH nanoplates (~73 nm × 7 nm) interdigitated vertical to the surfaces of rGO layer in both sides, fabricated through a simple citric acid-assisted aqueous-phase coprecipitation method...
October 13, 2017: ACS Applied Materials & Interfaces
Arthur Langry, Joël Cellier, Horst Hintze-Bruening, Fabrice Leroux
A novel preparation route for layered hydroxide based hybrid phases has been investigated combining the polyol route with the in situ generation of inorganic platelets, in the presence of an amphiphilic polymer as well as bola-amphiphiles. The polyol route consists of hydrolysis in an alcoholic medium containing acetate metal cations as precursor(s), to yield an LDH Zn2Al cation composition or LSH-Zn (layered single hydroxide). A bola amphiphile is described as hydrophobic polymer segment-telechelic-chains terminated by two anionic hydrophilic end groups, using volatile ammonium cations as counter ions...
October 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Wenzong Xu, Bingliang Zhang, Xiaoling Wang, Guisong Wang, Ding Ding
The co-precipitation method was used to synthesize a hybrid with MgAl-layered double hydroxide loaded graphene (RGO-LDH). CuMoO4 was then introduced onto the surface of RGO-LDH to prepare a hybrid with CuMoO4 modified RGO-LDH (RGO-LDH/CuMoO4). The composition, structure and morphology of RGO-LDH/CuMoO4 were characterized by X-ray diffraction, Laser raman spectroscopy and Transmission electron microscope-energy-dispersive X-ray spectroscopy. It was found that the hybrid of RGO-LDH/CuMoO4 had been successfully prepared...
October 2, 2017: Journal of Hazardous Materials
Mei Yu, Ruili Liu, Jianhua Liu, Songmei Li, Yuxiao Ma
Polyhedral-like NiMn-layered double hydroxide/porous carbon (NiMn-LDH/PC-x) composites are successfully synthesized by hydrothermal method (x = 1, 2 means different mass percent of porous carbon (PC) in composites). The NiMn-LDH/PC-1 composites possess specific capacitance 1634 F g(-1) at a current density of 1 A g(-1) , and it is much better than that of pure LDH (1095 F g(-1) at 1 A g(-1) ). Besides, the sample can retain 84.58% of original capacitance after 3000 cycles at 15 A g(-1) . An asymmetric supercapacitor with NiMn-LDH/PC-1 as anode and activated carbon as cathode is fabricated, and the supercapacitor can achieve an energy density of 18...
October 10, 2017: Small
Goli Nagaraju, S Chandra Sekhar, L Krishna Bharat, Jae Su Yu
We report a flexible battery-type electrode based on binder-free nickel cobalt layered double hydroxide nanosheets adhered to nickel cobalt layered double hydroxide nanoflake arrays on nickel fabric (NC LDH NFAs@NSs/Ni fabric) using facile and eco-friendly synthesis methods. Herein, we utilized discarded polyester fabric as a cost-effective substrate for in situ electroless deposition of Ni, which exhibited good flexibility, light weight, and high conductivity. Subsequently, the vertically aligned NC LDH NFAs were grown on Ni fabric by means of a hot-air oven-based method, and fluffy-like NC LDH NS branches are further decorated on NC LDH NFAs by a simple electrochemical deposition method...
October 18, 2017: ACS Nano
Yanqun Tang, Xiaoyu Fang, Xin Zhang, Gina Fernandes, Yong Yan, Dongpeng Yan, Xu Xiang, Jing He
Hydrogen generation from water splitting could be an alternative way to meet increasing energy demands while also balancing the impacts of energy being supplied by fossil fuels. The efficacy of water splitting is strongly dependent on the performance of electrocatalysts. Herein, we report a unique space-confined earth abundant bifunctional electrocatalyst for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) leading to high-efficiency water splitting. Outperforming Pt/C or RuO2 catalysts, this mesoscopic, space-confined, bifunctional configuration is constructed from a monolithic zeolitic imidazolate framework@layered double hydroxides (ZIF@LDH) precursor on Ni foam...
October 9, 2017: ACS Applied Materials & Interfaces
Mingming Zhao, Qunxing Zhao, Bing Li, Huaiguo Xue, Huan Pang, Changyun Chen
As representative two-dimensional (2D) materials, layered double hydroxides (LDHs) have received increasing attention in electrochemical energy storage and conversion because of the facile tunability between their composition and morphology. The high dispersion of active species in layered arrays, the simple exfoliation into monolayer nanosheets and chemical modification offer the LDHs an opportunity as active electrode materials in electrochemical capacitors (ECs). LDHs are favourable in providing large specific surface areas, good transport features as well as attractive physicochemical properties...
October 19, 2017: Nanoscale
Heemin Kang, Minkyu Kim, Qian Feng, Sien Lin, Kongchang Wei, Rui Li, Chan Ju Choi, Tae-Hyun Kim, Gang Li, Jae-Min Oh, Liming Bian
Cellular behaviors, such as differentiation, are regulated by complex ligation processes involving cell surface receptors, which can be activated by various divalent metal cations. The design of nanoparticle for co-delivery of ligand and ligation activator can offer a novel strategy to synergistically stimulate ligation processes in vivo. Here, we present a novel layered double hydroxide (LDH)-based nanohybrid (MgFe-Ado-LDH), composed of layered MgFe hydroxide nanocarriers sandwiching the adenosine cargo molecule, maintained through an electrostatic balance, to co-deliver the adenosine (Ado) ligand from the interlayer spacing and the Mg(2+) ion (ligation activator) through the dissolution of the MgFe nanocarrier itself...
September 29, 2017: Biomaterials
Doretta Capsoni, Irene Quinzeni, Giovanna Bruni, Valeria Friuli, Lauretta Maggi, Marcella Bini
The development of efficient strategies for drug delivery is considerably desired. Indeed, often several issues such as the drug solubility, the control of the drug release rate, the targeted delivery of drugs, the drug bioavailability and the minimization of secondary effects still present great obstacles. Different methodologies have been proposed, but the use of nano-hybrids compounds that combine organic and inorganic substances seems particularly promising. An interesting inorganic host is the layered double hydroxide (LDH) with a sheets structure and formula M(2+)1-x M(3+)x (OH)2](A(n-))x/n yH2O (M(2+)= Zn, Mg; M(3+)=Al; A(n-) = nitrates, carbonates, chlorides)...
October 5, 2017: Journal of Pharmaceutical Sciences
Fernando Maya, Carlos Palomino Cabello, Milad Ghani, Gemma Turnes Palomino, Víctor Cerdà
This review provides an update on the implementation of emerging materials as sorbents for sample preparation in combination with chromatographic separation. We have focused on recent applications of metal-organic frameworks, layered double hydroxides, porous carbons obtained from polymers or biomass precursors, and silicates (clays and zeolites). The review is directed towards the strategies followed by the authors to engineer suitable supports enabling the application of materials with unconventional size and shape as high performance sorbents to explore new boundaries in sample pretreatment in manual or automated modes...
October 6, 2017: Journal of Separation Science
Yufei Zhao, Yunxuan Zhao, Geoffrey I N Waterhouse, Lirong Zheng, Xingzong Cao, Fei Teng, Li-Zhu Wu, Chen-Ho Tung, Dermot O'Hare, Tierui Zhang
Semiconductor photocatalysis attracts widespread interest in water splitting, CO2 reduction, and N2 fixation. N2 reduction to NH3 is essential to the chemical industry and to the Earth's nitrogen cycle. Industrially, NH3 is synthesized by the Haber-Bosch process under extreme conditions (400-500 °C, 200-250 bar), stimulating research into the development of sustainable technologies for NH3 production. Herein, this study demonstrates that ultrathin layered-double-hydroxide (LDH) photocatalysts, in particular CuCr-LDH nanosheets, possess remarkable photocatalytic activity for the photoreduction of N2 to NH3 in water at 25 °C under visible-light irradiation...
September 28, 2017: Advanced Materials
Sébastien Livi, Luanda Chaves Lins, Jakub Peter, Hynek Benes, Jana Kredatusova, Ricardo K Donato, Sébastien Pruvost
In this work, phosphonium ionic liquids (ILs) based on tetra-alkylphosphonium cations combined with carboxylate, phosphate and phosphinate anions, were used for organic modification of layered double hydroxide (LDH). Two different amounts (2 and 5 wt %) of the organically modified LDHs were mixed with poly(butylene adipate-co-terephthalate) (PBAT) matrix by melt extrusion. All prepared PBAT/IL-modified-LDH composites exhibited increased mechanical properties (20-50% Young's modulus increase), decreased water vapor permeability (30-50% permeability coefficient reduction), and slight decreased crystallinity (10-30%) compared to the neat PBAT...
September 28, 2017: Nanomaterials
Lijun Wang, Yusen Wang, Xiaoxia Wang
Highly dispersed Fe(3+)-doped layered double hydroxide (LDH-Fe) nanorings were obtained by a simple coprecipitation-acid etching approach. The morphology, structure, magnetic resonance imaging (MRI) performance in vitro, drug loading and releasing, Fe(3+) leakage, and cytotoxicity of the as-prepared LDH-Fe nanorings were characterized. The LDH-Fe nanorings showed good water dispersity and a well-crystallized structure. The DLS average size of nanoparticles was measured to be 94.5 nm. Moreover, the MRI tests showed a favourable T₁-weighted MRI performance of the LDH-Fe nanoring with r₁ values of 0...
September 27, 2017: Materials
Hao Zhang, Yinlin Tong, Qingyi Lu, Feng Gao
Highly active, durable and cost-effective electrocatalyst for water oxidation is at the center of renewable energy technologies, including water splitting and metal-air batteries. However, the development of oxygen catalysts with high activity at low cost remains a great challenge. Herein, we report an in situ anti-solvent approach for synthesizing ultrathin Co-Ni layered double hydroxide (CoNi-LDH) nanosheets wrapped on hollow Co3O4 nanoparticle-embedded nitrogen-doped carbon (HCo3O4-NC) as a high-performance catalyst for oxygen evolution reaction (OER)...
September 26, 2017: Chemistry: a European Journal
Márton Szabados, Gábor Varga, Zoltán Kónya, Ákos Kukovecz, Stefan Carlson, Pál Sipos, István Pálinkó
An ultrasonically-enhanced mechanochemical method was developed to synthesize CaFe-layered double hydroxides (LDHs) with various interlayer anions (CO3(2-), NO3(-), ClO4(-), N3(-), F(-), Cl(-), Br(-) and I(-)). The duration of pre-milling and ultrasonic irradiation and the variation of synthesis temperature in the wet chemical step were investigated to obtain the optimal parameters of preparation. The main method to characterize the products was X-ray diffractometry, but infrared and synchrotron-based X-ray absorption spectroscopies as well as thermogravimetric measurements were also used to learn about fine structural details...
January 2018: Ultrasonics Sonochemistry
Roozbeh Soltani, Ali Shahvar, Mohammad Dinari, Mohammad Saraji
In this paper, we report an environmentally-friendly and low cost synthetic approach for large-scale fabrication of 2-dimentional porous Ni/Co-NO3-based layered double hydroxide (Ni/Co-NO3-LDH) nanosheet through ultrasonic-assisted process. The synthesis procedure used ethylene glycol/water system as an eco-friendly solvent system. The synthesized LDH was characterized by FE-SEM, TEM, XRD, and FT-IR techniques. FE-SEM and TEM images showed porous structure surface morphology of the synthesized LDH. Also, For Ni/Co-NO3-LDH, a hexagonal ultrathin layered was obtained owing to ultrasonic irradiation and applied processing conditions...
January 2018: Ultrasonics Sonochemistry
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