Exfoliation of layered double hydroxides (LDHs): a new route to mineralize atmospheric CO<sub>2</sub>

Manohara, G. V.

doi:10.1039/c4ra08865d

Cited by 22 publications

(25 citation statements)

References 87 publications

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“…Sample name BET surface area (m 2 g À1 ) Average pore diameter (Å) Pore volume (cm 3 thickness of 10-20 nm. However, the average size and thickness of CC-LDHs (shown in Figure 4(e)) are significantly larger than in the case of TUC-LDHs.…”

Section: Nitrogen Adsorption-desorption Isotherm For Tu-ldhs Cc-ldhsmentioning

confidence: 99%

“…Hence, developing efficient and environmental friendly CO 2 adsorbents will be crucial to CO 2 capture. Layered double hydroxides (LDHs) are considered as good candidates for CO 2 adsorption because of their fast sorption/ desorption kinetics and simple regenerability [3,4]. LDHs are a class of ionic lamellar compounds made up of positively charged brucite-like layers with an interlayer region containing charge compensating anions and solvation molecules.…”

Section: Introductionmentioning

confidence: 99%

“…K + ,Cs + ,Na + , etc.) [13][14][15][16], synthetic method [17], the presence of SO 2 and H 2 O [18,19], particle size [3,20] and calcination temperature or adsorption temperature [21,22]. Yong and Rodrigues compared several commercial hydrotalcite-like compounds that can have the average CO 2 adsorption capacity (0.2-0.5 mmol g À1 ) at 300°C and 1 bar of CO 2 [6].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO₂ Adsorption

Huang¹,

Yang²,

Li³

et al. 2020

Sorption in 2020s

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Hybrid Two-step synthesis method for preparation of MgAl LDHs materials for CO 2 adsorption has been employed because of the features of fast micromixing and enhanced mass transfer by using a 'T-mixer' reactor. MgAl LDHs with different morphologies were successfully obtained by three different synthesis routes: ultrasonication-intensified in 'T-mixer' (TU-LDHs), conventional co-precipitation (CC-LDHs) and ultrasonic-intensified in 'T-mixer' pretreatment followed by conventional co-precipitation (TUC-LDHs). The synthesized samples characterized by the XRD showed that LDHs formed a typical layered double hydroxide structure and no other impurities were identified in the compound. The SEM and TEM analyses also confirmed that the size distribution of TUC-LDHs was relatively uniform (with an average size of approximate 100 nm) and layered structure was clearly visible. The BET characterization indicated that such LDHs had a large surface area (235 m 2 g À1 ), which makes it a promising adsorbent material for CO 2 capture in practical application. It can be found that the CO 2 adsorption capacities of TU-LDHs, CC-LDHs and TUC-LDHs at 80°C were 0.30, 0.22 and 0.28 mmol g À1 , respectively. The CO 2 adsorption capacities of TU-LDHs, CC-LDHs and TUC-LDHs at 200°C were 0.33, 0.25 and 0.36 mmol g À1 , respectively. The order of CO 2 adsorption capacity to reach equilibrium at 80°C seen in Avrami model is: TU-LDHs > TUC-LDHs > CC-LDHs. The CO 2 adsorption/desorption cycling test reveals that TU-LDHs and TUC-LDHs have good adsorption stability than CC-LDHs.

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Section: Nitrogen Adsorption-desorption Isotherm For Tu-ldhs Cc-ldhsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO₂ Adsorption

Huang¹,

Yang²,

Li³

et al. 2020

Sorption in 2020s

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“…[26,54] Increasedl oadingc auses material aggregation andt he nanofiller switches to an insulator,f ostering polymerc rystallinity and hindering ion mobility.U nderstanding the mechanism of ion conductioni nt he molecular-or atomic level-is still elusive despite advancements and ability to analyse the individual variables making up the entire concept. [26,54] Increasedl oadingc auses material aggregation andt he nanofiller switches to an insulator,f ostering polymerc rystallinity and hindering ion mobility.U nderstanding the mechanism of ion conductioni nt he molecular-or atomic level-is still elusive despite advancements and ability to analyse the individual variables making up the entire concept.…”

Section: Effectsof2 Dnanofillersmentioning

confidence: 99%

“…Asurge in conductivity values is the universal trend upon increasedf iller loading owing to more chargec arriers made available, but an overall conclusion with SPE studies gather that there is at hreshold regarding 2D nanofiller content: ionic conductivity increases relatively to the amounto fc lay incorporation and gradually declines, which is around1 0-20wt% natural clay or LDHs and not more than 1wt% for GO. [26,54] Increasedl oadingc auses material aggregation andt he nanofiller switches to an insulator,f ostering polymerc rystallinity and hindering ion mobility.U nderstanding the mechanism of ion conductioni nt he molecular-or atomic level-is still elusive despite advancements and ability to analyse the individual variables making up the entire concept. Explaining ion migration is ac hallenging undertaking because of the varying polymer/salt blends, further complicated with the interrelationo fs tructure, dynamics, and dependence of these individual componentst owards one another and towards externalf actors (i.e.…”

Section: Effectsof2 Dnanofillersmentioning

confidence: 99%

Hybrid Solid Polymer Electrolytes with Two‐Dimensional Inorganic Nanofillers

Chua

Fang

Sun

et al. 2018

Chemistry A European J

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Solidp olymer electrolytes are of rapidly increasing importance for the research andd evelopment of future safe batteries with high energy density.T he diversified chemistry and structures of polymers allow the utilization of aw ide range of soft structures for all-polymers olid-state electrolytes. With equal importance is the hybrid solid-state electrolytes consisting of both "soft" polymeric structure and "hard" inorganic nanofillers.T he recent emergence of the re-discovery of many two-dimensional layered materials hass timulated the booming of advanced research in energy storage fields, such as batteries, supercapacitors, and fuel cells. Of special interesti st he mass transport properties of these 2D nanostructures for water,g as, or ions. This review aims at the current progress and prospective development of hybrid polymer-inorganic solid electrolytes based on important 2D materials, including natural clay and synthetic lamellar structures. The ion conduction mechanism and the fabrication, property and device performance of these hybrid solid electrolyteswill be discussed.

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Defect‐Promoted Ni‐Based Layer Double Hydroxides with Enhanced Deprotonation Capability for Efficient Biomass Electrooxidation

Yang,

Lie,

Unocic

et al. 2023

Advanced Materials

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Ni‐based hydroxides are promising electrocatalysts for biomass oxidation reactions, supplanting the oxygen evolution reaction (OER) due to lower overpotentials while producing value‐added chemicals. The identification and subsequent engineering of their catalytically active sites are essential to facilitate these anodic reactions. Herein, the proportional relationship between catalysts’ deprotonation propensity and Faradic efficiency of 5‐HMF‐to‐FDCA production (FEFDCA) is revealed by thorough DFT simulations and atomic‐scale characterizations, including in‐situ synchrotron diffraction and spectroscopy methods. The deprotonation capability of ultrathin layer‐double hydroxides (UT‐LDHs) is regulated by tuning the covalency of metal (M)‐oxygen (O) motifs through defect site engineering and selection of M3+ co‐chemistry. NiMn UT‐LDHs show an ultrahigh FEFDCA of 99% at 1.37 V versus RHE and retain a high FEFDCA of 92.7% in the OER‐operating window at 1.52 V, about 2x that of NiFe UT‐LDHs (49.5%) at 1.52 V. Ni‐O and Mn‐O motifs function as dual active sites for HMF electrooxidation, where the continuous deprotonation of Mn‐OH sites plays a dominant role in achieving high selectivity while suppressing OER at high potentials. Our results showcase a universal concept of modulating competing anodic reactions in aqueous biomass electrolysis by electronically engineering the deprotonation behavior of metal hydroxides, anticipated to be translatable across various biomass substrates.This article is protected by copyright. All rights reserved

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Exfoliation of layered double hydroxides (LDHs): a new route to mineralize atmospheric CO₂

Cited by 22 publications

References 87 publications

Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO₂ Adsorption

Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO₂ Adsorption

Hybrid Solid Polymer Electrolytes with Two‐Dimensional Inorganic Nanofillers

Defect‐Promoted Ni‐Based Layer Double Hydroxides with Enhanced Deprotonation Capability for Efficient Biomass Electrooxidation

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Exfoliation of layered double hydroxides (LDHs): a new route to mineralize atmospheric CO2

Cited by 22 publications

References 87 publications

Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO2 Adsorption

Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO2 Adsorption

Hybrid Solid Polymer Electrolytes with Two‐Dimensional Inorganic Nanofillers

Defect‐Promoted Ni‐Based Layer Double Hydroxides with Enhanced Deprotonation Capability for Efficient Biomass Electrooxidation

Contact Info

Product

Resources

About

Exfoliation of layered double hydroxides (LDHs): a new route to mineralize atmospheric CO₂

Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO₂ Adsorption

Hybrid Two-step Preparation of Nanosized MgAl Layered Double Hydroxides for CO₂ Adsorption