Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties

Zhang, Siyuan; Diehl, Leo; Wrede, Sina; Lotsch, Bettina V.; Scheu, Christina

doi:10.3390/catal10010013

Cited by 7 publications

(4 citation statements)

References 40 publications

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“…These sizes are, on average, a bit smaller than those reported In accordance with TEM images (Figure 5), the main part of the nanosheets obtained has a rectangular shape with lateral dimensions of 30-250 nm, which does not exceed the values estimated by DLS. These sizes are, on average, a bit smaller than those reported earlier for the nanosheets of other layered perovskite-like oxides [97][98][99][100][101][102]. This difference might be a result of unequal exfoliation conditions.…”

Section: Investigation Of the Nanosheet Morphologycontrasting

confidence: 59%

Highly Efficient Liquid-Phase Exfoliation of Layered Perovskite-like Titanates HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd) into Nanosheets

Kurnosenko,

Minich,

Silyukov

et al. 2023

Nanomaterials

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Nanosheets of layered perovskite-like oxides attract researchers as building blocks for the creation of a wide range of demanded nanomaterials. However, Ruddlesden–Popper phases are difficult to separate into nanosheets quantitatively via the conventional liquid-phase exfoliation procedure in aqueous solutions of bulky organic bases. The present study has considered systematically a relatively novel and efficient approach to a high-yield preparation of concentrated suspensions of perovskite nanosheets. For this, the Ruddlesden–Popper titanates HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd) have been intercalated by n-alkylamines with various chain lengths, exposed to sonication in aqueous tetrabutylammonium hydroxide (TBAOH) and centrifuged to separate the nanosheet-containing supernatant. The experiments included variations of a wide range of conditions, which allowed for the achievement of impressive nanosheet concentrations in suspensions up to 2.1 g/L and yields up to 95%. The latter were found to strongly depend on the length of intercalated n-alkylamines. Despite the less expanded interlayer space, the titanates modified with short-chain amines demonstrated a much higher completeness of liquid-phase exfoliation as compared to those with long-chain ones. It was also shown that the exfoliation efficiency depends more on the sample stirring time in the TBAOH solution than on the sonication duration. Analysis of the titanate nanosheets obtained by means of dynamic light scattering, electron and atomic force microscopy revealed their lateral sizes of 30–250 nm and thickness of 2–4 nm. The investigated exfoliation strategy appears to be convenient for the high-yield production of perovskite nanosheet-based materials for photocatalytic hydrogen production, environmental remediation and other applications.

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Section: Investigation Of the Nanosheet Morphologycontrasting

confidence: 59%

Highly Efficient Liquid-Phase Exfoliation of Layered Perovskite-like Titanates HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd) into Nanosheets

Kurnosenko,

Minich,

Silyukov

et al. 2023

Nanomaterials

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“…In contrast, the edges of β-Ni(OH) 2 (72 h) shift toward higher energy loss. The so-called chemical shift is caused by a shift in the unoccupied states with respect to the core states (2p for L 2 and L 3 edges), which may indicate the changes in the valence state and the local coordination of the present phase . For example, there is a clear peak shift of ≈0.3 eV between α- and β-Ni(OH) 2 .…”

Section: Resultsmentioning

confidence: 99%

V(III)-Doped Nickel Oxide-Based Nanocatalysts for Electrochemical Water Splitting: Influence of Phase, Composition, and Doping on the Electrocatalytic Activity

et al. 2020

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Doped nickel oxide-based compounds are attracting great interest as very efficient and abundant catalysts and were thoroughly investigated as battery materials in the past. However, there is still no clear understanding of the influence of dopants on the complex dynamic character of their chemically and potentially driven transformations. We have developed a synthesis procedure enabling the controlled formation of nanosized nickel hydroxide and nickel oxide polymorphs substituted with vanadium(III) [V(III)] ions and further investigated their structure−activity correlation for electrochemical water oxidation. This work therefore primarily focuses on an in-depth structural characterization of the homogeneously doped nanosized αand β-Ni(OH) 2 polymorphs. It could be shown that concentrations of 10 at. % V(III) and higher can effectively inhibit a spontaneous phase transformation known as chemical aging of the turbostratic α-phase to the more crystalline β-Ni(OH) 2 phase in neutral aqueous media. The Fe-impuritybiased electrocatalytic activity determined for α-/β-Ni 1−x V x (OH) 2 showed only a minor increase of 10% oxygen evolution reaction (OER) activity for an 1 at. % doped nonaged sample resembling the α-phase, while a 5 at. % V(III)-doped sample chemically aged over 24 h led to a doubled OER activity versus the undoped reference which transformed into β-Ni(OH) 2 over that period of time.

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“…In the process of fabrication, KCa 2 Nb 3 O 10 cannot be directly converted into Ca 2 Nb 3 O 10 − nanosheets but the Ca 2 Nb 3 O 10 − nanosheets can be derived through the exfoliation of HCa 2 Nb 3 O 10 after K + ion was exchanged with H + ions from aqueous acidic solution step. Calcium niobate nanosheets have been focused on because the Ca 2 Nb 3 O 10 − nanosheets can be applied to utilize in several industries such as battery materials, 27 photocatalysts, 28 thin films, 29 heavy metal adsorbents, 30 water spitting agents, 31 and filter membranes. 32 The fabrication of nanosheets has been explored by many research groups, which studied exfoliation methods.…”

Section: Introductionmentioning

confidence: 99%

The steric effect of exfoliation agent for fabrication of layer niobium oxide nanosheet

Wattanapaphawong,

Reubroycharoen,

Samart

et al. 2023

Int J Applied Ceramic Tech

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In this research, the steric effect of an exfoliation agent between n‐ethylamine and triethylamine for the fabrication of Ca2Nb3O10− nanosheet was investigated. The experimental results revealed that the different structures of the exfoliation agent have affected to fabrication of Ca2Nb3O10− nanosheet. The use of n‐ethylamine as an exfoliation agent gave a maximum exfoliation efficiency of 10 wt.% while the maximum exfoliation efficiency of triethylamine was 90 wt.%. The result showed that the difference in exfoliation efficiency was caused by the steric effect of exfoliation agents. The image of transmission electron microscopy exhibited Ca2Nb3O10− nanosheets which were formed by exfoliation of HCa2Nb3O10. Furthermore, the reaction time for liquid exfoliation was studied in this work. The reaction time at 4 h gave a maximum of exfoliation efficiency. The Ca2Nb3O10− suspension was tested capability to remove hazardous ions. After the experiment, we found the white precipitate which was the formation of CsCa2Nb3O10. The result showed that the Ca2Nb3O10− nanosheet was efficient for the removal of Cs+ ions in the wastewater.

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Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties

Cited by 7 publications

References 40 publications

Highly Efficient Liquid-Phase Exfoliation of Layered Perovskite-like Titanates HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd) into Nanosheets

Highly Efficient Liquid-Phase Exfoliation of Layered Perovskite-like Titanates HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd) into Nanosheets

V(III)-Doped Nickel Oxide-Based Nanocatalysts for Electrochemical Water Splitting: Influence of Phase, Composition, and Doping on the Electrocatalytic Activity

The steric effect of exfoliation agent for fabrication of layer niobium oxide nanosheet

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