Ionothermal synthesis of cobalt iron layered double hydroxides (LDHs) with expanded interlayer spacing as advanced electrochemical materials

2014 ◽  
Vol 2 (40) ◽  
pp. 17066-17076 ◽  
Author(s):  
X. Ge ◽  
C. D. Gu ◽  
X. L. Wang ◽  
J. P. Tu
Keyword(s):  
Layered Double Hydroxides ◽  
Interlayer Spacing ◽  
Ionothermal Synthesis ◽  
Cobalt Iron ◽  
Double Hydroxides

scholarly journals Mn-Fe Layered Double Hydroxide Intercalated with Ethylene-Diaminetetraacetate Anion: Synthesis and Removal of As(III) from Aqueous Solution around pH 2–11

2020 ◽  
Vol 17 (24) ◽  
pp. 9341
Author(s):  
Guifeng Liu ◽  
Zongqiang Zhu ◽  
Ningning Zhao ◽  
Yali Fang ◽  
Yingying Gao ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Layered Double Hydroxides ◽  
Interlayer Spacing ◽  
Maximum Adsorption Capacity ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Xps Characterization ◽  
Ph Range ◽  
Double Hydroxide ◽  
Double Hydroxides

A novel adsorbent Mn-Fe layered double hydroxides intercalated with ethylenediaminete-traacetic (EDTA@MF-LDHs) was synthesized by a low saturation coprecipitation method. The behavior and mechanism of As(III) removed by EDTA@MF-LDHs were investigated in detail in comparison with the carbonate intercalated Mn-Fe layered double hydroxides (CO3@MF-LDHs). The results showed that EDTA@MF-LDHs had a higher removal efficiency for As(III) than As(V) with a broader pH range than CO3@MF-LDH. The large adsorption capacity of EDTA@MF-LDHs is related to its large interlayer spacing and the high affinity of its surface hydroxyl groups. The maximum adsorption capacity for As(III) is 66.76 mg/g at pH 7. The FT-IR and XPS characterization indicated that the removal mechanism of the As(III) on EDTA@MF-LDHs include surface complexation, redox, and ion exchange.

Cobalt iron phosphide nanoparticles embedded within a carbon matrix as highly efficient electrocatalysts for the oxygen evolution reaction

2019 ◽  
Vol 55 (62) ◽  
pp. 9212-9215 ◽  
Author(s):  
Jiang Han ◽  
Gen Chen ◽  
Xiaohe Liu ◽  
Ning Zhang ◽  
Shuquan Liang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxides ◽  
Oxygen Evolution Reaction ◽  
Carbon Matrix ◽  
Iron Phosphide ◽  
Highly Efficient ◽  
Cobalt Iron ◽  
One Step ◽  
Double Hydroxides

Co3FePx/C nanocomposites were derived from one-step phosphorization of anthraquinone-2-sulfonate (AQS2) intercalated Co3Fe layered double hydroxides (Co3Fe LDHs).

scholarly journals Boosting oxygen evolution of single-atomic ruthenium through electronic coupling with cobalt-iron layered double hydroxides

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Pengsong Li ◽  
Maoyu Wang ◽  
Xinxuan Duan ◽  
Lirong Zheng ◽  
Xiaopeng Cheng ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxides ◽  
Electronic Coupling ◽  
Cobalt Iron ◽  
Double Hydroxides

Preparation of hydroxy double salts exchanged by organic compounds

1998 ◽  
Vol 13 (4) ◽  
pp. 848-851 ◽  
Author(s):  
Hiroyuki Morioka ◽  
Hideyuki Tagaya ◽  
Masa Karasu ◽  
Jun-ichi Kadokawa ◽  
Koji Chiba
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Layered Double Hydroxides ◽  
Interlayer Spacing ◽  
Layered Materials ◽  
Exchange Reactions ◽  
Double Salts ◽  
Hydroxy Double Salts ◽  
Double Hydroxides ◽  
Positively Charged

Hydroxy double salts (HDS's) comprise a class of layered materials that are similar to layered double hydroxides (LDH's) and show a comparable intracrystalline reactivity. Their anion exchange reactions occur with preincorporated anions in the hydroxide layer and with anions bound as gegenions of the positively charged layers, respectively. In this study, nitrate and acetate anions of HDS's were exchanged with anionic monoand di-carboxylic acids, and we confirmed that interlayer spacing of HDS's increased depending on the size of mono- and di-carboxylic acids. Moreover, we have prepared photofunctional materials by exchange reaction with azobenzene-p-carboxylic acid and 4–4′-azobenzenedicarboxylic acid.

Boron-modified cobalt iron layered double hydroxides for high efficiency seawater oxidation

Nano Energy ◽  
2021 ◽  
Vol 83 ◽  
pp. 105838
Author(s):  
Libo Wu ◽  
Luo Yu ◽  
Qiancheng Zhu ◽  
Brian McElhenny ◽  
Fanghao Zhang ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
High Efficiency ◽  
Cobalt Iron ◽  
Double Hydroxides

Molecular Dynamics Simulation of Interlayer Structure and Hydration Properties of Glycine Intercalated Layered Double Hydroxides

2011 ◽  
pp. 242-250
Author(s):  
Guo-Xiang Pan ◽  
Feng Cao ◽  
Pei-Song Tang ◽  
Hai-Feng Chen ◽  
Zhe-Ming Ni ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bond ◽  
Layered Double Hydroxides ◽  
Interlayer Spacing ◽  
Dynamics Simulation ◽  
Water Molecules ◽  
Hydration Properties ◽  
Interlayer Structure ◽  
Double Hydroxides ◽  
Water Contents

Interlayer structure, hydrogen-bond, hydration and swelling properties of glycine intercalated layered double hydroxides (LDHs-Gly) were investigated with molecular dynamics (MD) methods. The results show that the interlayer spacing dc increases as hydration level increases. The computed hydration energies reach the most negative values at low water contents and change rapidly over the range 1 = NW = 6, and slowly and gradually approach the potential energy for bulk SPC water at NW > 6. But there are no local minima in the energy over the entire hydration range. This result suggests that LDHs-Gly tend to absorb water continuously in water-rich environments and enhance swelling to delaminate the hydroxide layers. The interlayers of LDHs-Gly exhibit complex hydrogen-bond network. With water content increasing, the glycine molecules progressively change their orientation from parallel to the layers to nearly perpendicular. Water molecules firstly form hydrogen-bond with M-OH layers at low water contents. While the hydroxide layers gradually get to saturation state at Nw > 3. And then water molecules continuously fill the interlayer to expand interlayer spacing.

Systematic Preparation Of Polyoxometalate Pillared Layered Double Hydroxides Via Direct Aqueous Reaction

1991 ◽  
Vol 233 ◽  
Author(s):  
Jiandang Wang ◽  
Ying Tian ◽  
Ren-Chain Wang ◽  
Jorge L. Colón ◽  
Abraham Clearfield
Keyword(s):  
Layered Double Hydroxides ◽  
Extended Period ◽  
Interlayer Spacing ◽  
X Ray ◽  
Keggin Ion ◽  
Keggin Ions ◽  
Great Ease ◽  
Key Factor ◽  
Double Hydroxides ◽  
The Ideal

ABSTRACTThe series of layered double hydroxides, MgnAl(OH)2n+2X (n = 2–5, X = NO3− or Cl−) and NinAl(OH) 2n+2X (n = 2–4, X = NO3− or Cl−), were pillared with polyoxometalate ions of the Keggin structure, ranging from [PW12O40]3− to [PV4W8O40]7−, in aqueous solution. Full exchange of the Keggin ions into the layers is achieved as evidenced by X-ray powder diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. Also, partial exchange was observed for Ni5Al(OH)12NO3 The key factor that effects these reactions is the pre-swelling step. Thus, when the layered double hydroxides are thoroughly wet either by preparing wet solids or by soaking the dried products for an extended period, pillaring reactions proceed with great ease. Relations can be extracted between the water content and the separation between the layers, as well as between layer charge density and the charge of the Keggin ion. The pillared layered double hydroxides were found generally to have interlayer distances ranging from 11.0 to 13.5 Å, which is smaller than the numerical sum of the Keggin ion diameter and the ideal thickness of the hydroxide layer. This fact and the low crystallinity are attributed to strong interaction between the basic layered double hydroxides and the acidic Keggin ions. A more crystalline phase with the expected 14.5 Å interlayer spacing was also obtained as a mixture with the lower spaced products.

scholarly journals New acetate-intercalated CoNiFe, ZnNiFe and CoZnFe layered double hydroxides: Synthesis by hydrolysis in polyol medium and characterization

2014 ◽  
Vol 10 (9) ◽  
pp. 3097-3106 ◽  
Author(s):  
Nawal A. Drici Setti ◽  
Zoubir Derriche ◽  
Noureddine JOUINI
Keyword(s):  
Layered Double Hydroxides ◽  
Uv Spectroscopy ◽  
Chemical Properties ◽  
Interlayer Spacing ◽  
Molar Ratio ◽  
Transmission Electron ◽  
Physico Chemical ◽  
Interlayer Region ◽  
Polyol Medium ◽  
Double Hydroxides

New layered double hydroxides (LDHs) CoNiFe, ZnNiFe and CoZnFe with MII/MIII molar ratio of 3, with acetate ions in the interlayer region have been prepared by forced  hydrolysis in polyol medium.The physico-chemical properties of all products were characterized by the methods of powder X-ray Diffraction, Infrared Spectroscopy, UV-Spectroscopy, Elemental analysis, Thermal analysis, Transmission Electron Microscopy and Scanning Electron Microscopy.It was found that all compounds present the typical features of hydrotalcite-like structure and exhibit a turbostratic character.The insertion of acetate anions into LDHs was confirmed and the interlayer spacing values were respectively 12.47, 13.64 and 14.69 Å for CoNiFe, ZnNiFe and CoZnFe.We notice that there is a difference between the interlayer spacing for all synthesized phases with and without zinc. This can be explained by a structural modification on the level of the layers and/ or different arrangement from the inserted species (anions + water) in the interlayer space for zinc materials.57Fe Mössbauer spectrometry allows concluding the presence of Fe3+ cations which occupy octahedral sites and confirming the absence of Fe2+ in the as-prepared compounds.

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