Exfoliation-restacking synthesis of coal-layered double hydroxide nanosheets/reduced graphene oxide composite for high performance supercapacitors

Huang, Zongchuan; Wang, Senlin; Wang, Jianpeng; Yu, Yaming; Wen, Jingjing; Li, Rui

doi:10.1016/j.electacta.2014.11.085

Cited by 79 publications

(22 citation statements)

References 52 publications

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“…Interestingly, there are also contradictory results showing that LDH and graphene based superlattice is not obtainable by exfoliation-restacking. [16][17][18] In particular, there is no report on the successful synthesis of true Ni-Al LDH/GO superlattice (meaning superlattice diffraction in X-ray) to date, as far as we know. 17 This implies that fabricating a superlattice with Ni-Al LDH and GO is much more challenging than Co-Al or Co-Ni based LDH.…”

Section: Introductionmentioning

confidence: 94%

Periodic stacking of 2D charged sheets: Self-assembled superlattice of Ni–Al layered double hydroxide (LDH) and reduced graphene oxide

Yin

et al. 2016

Nano Energy

191

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Periodic Stacking of 2D Charged Sheets: Self-Assembled Superlattice of Ni-Al Layered Double Hydroxide (LDH) and Reduced Graphene Oxide, Nano Energy, http://dx. AbstractVertically stacked artificial 2D materials, such as van der Waals heterostructures, hold great scientific and technological promise. Stacking 2D atomic layers with stronger electrostatic forces in a controlled fashion could be more challenging. Positively charged atomic sheets of layered double hydroxide (LDH) such as hydrotalcite mineral with weakly bound anions have known intercalation and anion exchange properties, while reduced graphene oxide (rGO) are known to be negatively charged. So self-assembly of periodic (LDH/rGO) n superlattice is possible, although true periodicity at atomic scale has never been demonstrated for Ni-Al LDH. This work introduces a new protocol for the synthesis of true Ni-Al LDH / GO superlattice and the corresponding reduced product Ni-Al LDH/rGO, by systematically optimizing various key experimental parameters in chemical exfoliation, dispersion and self-assembly by co-feeding. This method is further applied to the successful synthesis of more complex Ni-Co-Al/GO superlattice. The Ni-Al LDH/rGO superlattice is then tested as cathode in alkaline hybrid supercapacitor, with 129 Ah/kg capacity at 8-min discharge, two times that of pristine Ni-Al LDH, and maintains 72.7 % of its initial capacity after 10,000 charge/discharge cycles. Our superlattice synthesis strategy and its energy applications demonstrate the potential to design artificial 2D materials.

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Section: Introductionmentioning

confidence: 94%

Periodic stacking of 2D charged sheets: Self-assembled superlattice of Ni–Al layered double hydroxide (LDH) and reduced graphene oxide

Yin

et al. 2016

Nano Energy

191

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“…The first weight loss from 25 to 200 °C can be assigned to the evaporation of surface adsorbed and interlayer water molecules, while the second weight loss at temperature between 250 and 350 °C corresponds to the decomposition of the interlayer nitrate anions and de-hydroxylation of the brucite-like layers. [44][45][46] Besides, pure g-C 3 N 4 decomposition starts at 550 °C and is completed at ~700 °C, which correspond to the burning of g-C 3 N 4 . 19 The general trend of thermal degradation of g-C 3 N /NiAl-LDH samples is similar to bare NiAl-LDH and g-C 3 N 4 .…”

Section: Formation Process and Characterization Of G-c 3 N 4 /Nial-ldmentioning

confidence: 99%

g-C₃N₄/NiAl-LDH 2D/2D Hybrid Heterojunction for High-Performance Photocatalytic Reduction of CO₂ into Renewable Fuels

Tonda

Kumar

Bhardwaj

et al. 2018

ACS Appl. Mater. Interfaces

464

212

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2D/2D interface heterostructures of g-CN and NiAl-LDH are synthesized utilizing strong electrostatic interactions between positively charged 2D NiAl-LDH sheets and negatively charged 2D g-CN nanosheets. This new 2D/2D interface heterojunction showed remarkable performance for photocatalytic CO reduction to produce renewable fuels such as CO and H under visible-light irradiation, far superior to that of either single phase g-CN or NiAl-LDH nanosheets. The enhancement of photocatalytic activity could be attributed mainly to the excellent interfacial contact at the heterojunction of g-CN/NiAl-LDH, which subsequently results in suppressed recombination, and improved transfer and separation of photogenerated charge carriers. In addition, the optimal g-CN/NiAl-LDH nanocomposite possessed high photostability after successive experimental runs with no obvious change in the production of CO from CO reduction. Our findings regarding the design, fabrication and photophysical properties of 2D/2D heterostructure systems may find use in other photocatalytic applications including H production and water purification.

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“…[53][54][55] The presence of surfacef unctional groups make GO negatively charged, whilst LDH is positively charged with replaceable anionic interlayer structures. [21,56] Huang et al fabricated compositeso fr GO and CoAl-LDH nanosheets (rGO/CAN-LDH-NS) by using the exfoliation/restacking method (Scheme 2A). [56] The layer-by-layer (LBL) method is analogous to the exfoliation/restacking method for the formation of G@LDHc omposites.…”

Section: Other Methodsmentioning

confidence: 99%

“…[21,56] Huang et al fabricated compositeso fr GO and CoAl-LDH nanosheets (rGO/CAN-LDH-NS) by using the exfoliation/restacking method (Scheme 2A). [56] The layer-by-layer (LBL) method is analogous to the exfoliation/restacking method for the formation of G@LDHc omposites. [57,58] Polymeric solutions, such as polyethyleneimine (PEI) and polyvinyl alcohol( PVA), were employed to provide ac ationic surface and multiple cycles were required to complete the synthesis process.…”

Section: Other Methodsmentioning

confidence: 99%

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Recent Advances in Composites of Graphene and Layered Double Hydroxides for Water Remediation: A Review

Pang

Wang

et al. 2019

Chemistry An Asian Journal

153

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Composites of layered double hydroxides( LDHs) and graphene (G) are excitingn anomaterials because of their uniques urface structures and excellent physicochemical properties. Such materials offer the advantages of both components,t hat is, the large surfacea rea and ample functional groups of graphene and the outstanding layered structure and ion-exchangeability of layered double hydroxides, whilst effectively avoiding the coagulation of graphene and the instability of pristine layered double hydroxides,a nd they have been widelyi nvestigated for applications in water remediation. This Minireview begins by summarizing the most common methods for the synthesis of G@LDH composites, including hydrothermalt reatment, coprecipitation, and in situ growth. Then, we review the adsorption and catalytic ability of G@LDH materials in the removal of contaminants from water,s uch as heavy metal ions, radionuclides, dyes, and other organic pollutants. Finally,w ed iscusst he challenges and offer ap erspective on the directions of future research of G@LDH composites.

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Exfoliation-restacking synthesis of coal-layered double hydroxide nanosheets/reduced graphene oxide composite for high performance supercapacitors

Cited by 79 publications

References 52 publications

Periodic stacking of 2D charged sheets: Self-assembled superlattice of Ni–Al layered double hydroxide (LDH) and reduced graphene oxide

Periodic stacking of 2D charged sheets: Self-assembled superlattice of Ni–Al layered double hydroxide (LDH) and reduced graphene oxide

g-C₃N₄/NiAl-LDH 2D/2D Hybrid Heterojunction for High-Performance Photocatalytic Reduction of CO₂ into Renewable Fuels

Recent Advances in Composites of Graphene and Layered Double Hydroxides for Water Remediation: A Review

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Exfoliation-restacking synthesis of coal-layered double hydroxide nanosheets/reduced graphene oxide composite for high performance supercapacitors

Cited by 79 publications

References 52 publications

Periodic stacking of 2D charged sheets: Self-assembled superlattice of Ni–Al layered double hydroxide (LDH) and reduced graphene oxide

Periodic stacking of 2D charged sheets: Self-assembled superlattice of Ni–Al layered double hydroxide (LDH) and reduced graphene oxide

g-C3N4/NiAl-LDH 2D/2D Hybrid Heterojunction for High-Performance Photocatalytic Reduction of CO2 into Renewable Fuels

Recent Advances in Composites of Graphene and Layered Double Hydroxides for Water Remediation: A Review

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g-C₃N₄/NiAl-LDH 2D/2D Hybrid Heterojunction for High-Performance Photocatalytic Reduction of CO₂ into Renewable Fuels