A New Strategy for Preparing Two-dimensional Nanomaterials by Exfoliating LDH Using Supercritical Ethanol

Zhang, Yue; Wen, Liang; Bai, Xueli; Song, Nianze; Huang, Xiaojia; Li, Yifei

doi:10.1246/cl.190437

Cited by 10 publications

(7 citation statements)

References 26 publications

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“…The Zn–Al oxynitride precursor was indexed as Zn–Al LDH (JCPDS 38-0486) (Figure ). The two reflections at 2θ = 11.7° ( d 003 = 0.75 nm) and 23.5° ( d 006 = 0.38 nm) confirm the production of carbonate-intercalated LDH . The intense narrow peaks indicate that the as-prepared Zn–Al LDH exhibits high crystallinity and a large crystallite size.…”

Section: Resultsmentioning

confidence: 81%

“…The FT-IR spectra of samples prepared at 773–873 K were similar to Zn–Al LDH but with lower transmittance, suggesting that some of Zn–Al LDHs remained (Figure S1). After the nitridation at a higher temperature (>873 K), the O–H vibrations at around 3400 and 1600 cm –1 were barely observed, and CO 3 2– vibrations at around 1360 and 770 cm –1 disappeared due to the collapse of the layered structure and transformation to oxide species. The presence of O–Zn–N, Zn–N, and Al–N peaks at 1510, 1380, and 710 cm –1 confirms the incorporation of an N dopant into the oxide lattice.…”

Section: Resultsmentioning

confidence: 99%

“…32 The two reflections at 2θ = 11.7°(d 003 = 0.75 nm) and 23.5°(d 006 = 0.38 nm) confirm the production of carbonate-intercalated LDH. 33 The intense narrow peaks indicate that the as-prepared Zn−Al LDH exhibits high crystallinity and a large crystallite size. The sample was composed of numerous plate-like particles that became large aggregates (Figure 1, inset).…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Orange Zn–Al–O–N Powder Active for Photocatalytic Water Reduction and Oxidation Synthesized from a Zn–Al Layered Double Hydroxide Using Urea as the Nitriding Agent

Suppaso

Nishioka

Kanazawa

et al. 2022

ACS Sustainable Chem. Eng.

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The development of colored inorganic powders that are inexpensive, chemically stable, and nontoxic is important for applications such as heterogeneous photocatalysts and pigments. Here, we show that a ZnO-based orange powder can be synthesized through thermal conversion of a two-dimensional Zn−Al layered double hydroxide (LDH) in the presence of urea as a nitriding agent, thereby avoiding the use of expensive, poisonous NH 3 gas. Heating a mixture of Zn−Al LDH and urea under a flow of N 2 at 773 K yielded N-doped ZnO as the main crystalline phase, along with a small amount of Zn(CN 2 ). At temperatures greater than 873 K, N-doped ZnO with deep-orange coloration began to appear as the main phase, accompanied by a small amount of γ-AlON. The orange color, which was attributed to the formation of a N-doped ZnO phase, became more prominent with increasing temperature up to 973 K. At temperatures greater than 973 K, an optically transparent ZnAl 2 O 4 phase was dominant, resulting in a loss of the orange coloration. Nitridation of Zn 5 (OH) 6 (CO 3 ) 2 and γ-AlOOH, which are analogous layered compounds prepared in a manner similar to that of Zn−Al LDH, with urea at 973 K did not yield an orange product. Under visible light, the Zn−Al−O−N powder produced H 2 from aqueous methanol solution and O 2 gas from a silver nitrate solution, with apparent quantum yields of 0.26 and 1.8% at 420 nm, respectively. This work highlights that the use of base metal-based LDH and an inexpensive solid nitrogen source may provide a unique platform for synthesizing a new photocatalyst material, which is unattainable with the previous method using toxic ammonia gas.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Orange Zn–Al–O–N Powder Active for Photocatalytic Water Reduction and Oxidation Synthesized from a Zn–Al Layered Double Hydroxide Using Urea as the Nitriding Agent

Suppaso

Nishioka

Kanazawa

et al. 2022

ACS Sustainable Chem. Eng.

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“…The presence of the Tyndall effect indicates the formation of a colloidal suspension. Zhang et al 68 reported a new strategy to exfoliate LDH by using supercritical ethanol. The procedure involves the intercalation of anionic surfactant into the decarbonated LDH by ion exchange, followed by an exfoliation of the surfactant-intercalated LDH in supercritical ethanol.…”

Section: Synthesis Routes Of 2d Ldhmentioning

confidence: 99%

Synthesis of two-dimensional layered double hydroxides: a systematic overview

et al. 2022

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“…AFM images indicate that the thickness of LDH nanosheets falls in the range of 2–4 nm, meaning the successful exfoliation. Compared with the liquid phase exfoliation in formamide mostly, the using of supercritical ethanol is harmless and easy to be removed 55…”

Section: Other Exfoliation Strategiesmentioning

confidence: 99%

Advanced Exfoliation Strategies for Layered Double Hydroxides and Applications in Energy Conversion and Storage

Chen

et al. 2020

Adv Funct Materials

112

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Along with the increasing aggravation of energy and environmental problems, the demand and utilization of renewable energy have increased. The rational design of advanced functional materials serves as a critical point for the improvement of performance and the practical application in renewable energy devices. Layered double hydroxides (LDHs) with 2D layered structures are promising energy materials for their unique physical and chemical properties. Nevertheless, the applications are limited by the structure of stacking with irrational electronic structure, sluggish mass transfer, and low activity. The exfoliation of LDHs into single‐ or few‐layered nanosheets appears to be a promising approach to overcome the above disadvantages. Herein, the recent progress on the development of exfoliation strategies for LDHs including liquid phase exfoliation, plasma‐induced exfoliation, and other advanced exfoliation strategies is highlighted and the applications in energy conversion and storage are systematically introduced.

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A New Strategy for Preparing Two-dimensional Nanomaterials by Exfoliating LDH Using Supercritical Ethanol

Cited by 10 publications

References 26 publications

Orange Zn–Al–O–N Powder Active for Photocatalytic Water Reduction and Oxidation Synthesized from a Zn–Al Layered Double Hydroxide Using Urea as the Nitriding Agent

Orange Zn–Al–O–N Powder Active for Photocatalytic Water Reduction and Oxidation Synthesized from a Zn–Al Layered Double Hydroxide Using Urea as the Nitriding Agent

Synthesis of two-dimensional layered double hydroxides: a systematic overview

Advanced Exfoliation Strategies for Layered Double Hydroxides and Applications in Energy Conversion and Storage

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