Single-crystalline ultrathin 2D TiO2 nanosheets: A bridge towards superior photovoltaic devices

Sheng, Liyuan; Liao, Ting; Kou, Liangzhi; Sun, Ziqi

doi:10.1016/j.mtener.2016.12.004

Cited by 71 publications

(43 citation statements)

References 39 publications

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“…by rationally employing lamellar reverse micelles (Figure 1). [98][99][100][101][102] Later, Xiao et al developed another strategy to synthesize 2D metal oxide nanosheets from solution by using the surfaces of water-soluble salt crystals as growth substrates or templates. In the synthesis, inverse lamellar micelles of Pluronic P123 polymer with a cosurfactant were used to confine the growth of the metal oxide along the thickness dimension and resulted in an atomic-level thickness of the obtained nanosheets.…”

Section: "Bottom-up" Synthesis Of 2d Metal Oxide Nanosheetsmentioning

confidence: 99%

“…Further studies from this group have demonstrated that these nanomaterials are very promising for application in energy harvesting, conversion, and storage devices, such as solar cells, fuel cells, LIBs, and NIBs. [98][99][100][101][102] Later, Xiao et al developed another strategy to synthesize 2D metal oxide nanosheets from solution by using the surfaces of water-soluble salt crystals as growth substrates or templates. [103] After dissolving the salt-template in water, the obtained 2D nanosheets could be reassembled into a binder-and additivefree film by filtration.…”

Section: "Bottom-up" Synthesis Of 2d Metal Oxide Nanosheetsmentioning

confidence: 99%

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Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

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The exponential increase in research focused on two-dimensional (2D) metal oxides has offered an unprecedented opportunity for their use in energy conversion and storage devices, especially for promising next-generation rechargeable batteries, such as lithium-ion batteries (LIBs) and sodium-ion batteries (NIBs), as well as some post-lithium batteries, including lithium-sulfur batteries, lithium-air batteries, etc. The introduction of well-designed 2D metal oxide nanomaterials into next-generation rechargeable batteries has significantly enhanced the performance of these energy-storage devices by providing higher chemically active interfaces, shortened ion-diffusion lengths, and improved in-plane carrier-/charge-transport kinetics, which have greatly promoted the development of nanotechnology and the practical application of rechargeable batteries. Here, the recent progress in the application of 2D metal oxide nanomaterials in a series of rechargeable LIBs, NIBs, and other post lithium-ion batteries is reviewed relatively comprehensively. Current opportunities and future challenges for the application of 2D nanomaterials in energy-storage devices to achieve high energy density, high power density, stable cyclability, etc. are summarized and outlined. It is believed that the integration of 2D metal oxide nanomaterials in these clean energy devices offers great opportunities to address challenges driven by increasing global energy demands.

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Section: "Bottom-up" Synthesis Of 2d Metal Oxide Nanosheetsmentioning

confidence: 99%

Section: "Bottom-up" Synthesis Of 2d Metal Oxide Nanosheetsmentioning

confidence: 99%

Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

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“…Non-ionic block copolymer templates have been increasingly used for this purpose as they lead to more robust structure, larger pores, easier control over the wall thickness and higher reproducibility than the ionic surfactants. [4][5][6][7][8] It is widely accepted that the pore size of mesoporous TiO 2 depends on the hydrophobic volume of the surfactant templates. [3,9] The strong effect of inorganic anions on the structure of porous materials template by non-ionic block copolymers has been already investigated.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Acids on Tuning the Pore Size of Mesoporous TiO₂ Templated by Non‐Ionic Block Copolymers

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“…At this temperature, anatase would be the expected phase of TiO 2 , as the anatase-rutile transformation is not expected until 620°C. 20 Both anatase and rutile nanosheets have been observed, [21][22][23][24] and 4-layer thick rutile nanosheets are predicted to be stable. 25 In situ heating in vacuum showed little change to the flake, expanded upon in Supplementary Fig.…”

Section: Oxidation By Watermentioning

confidence: 99%

An in situ and ex situ TEM study into the oxidation of titanium (IV) sulphide

et al. 2017

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Titanium (IV) sulphide (TiS 2 ) is a layered transition metal dichalcogenide, which we exfoliate using liquid phase exfoliation. TiS 2 is a candidate for being part of a range of future technologies. These applications are varied, and include supercapacitor and battery energy storage devices, catalytic substrates and the splitting of water. The driving force behind our interest was as a material for energy storage devices. Here we investigate a potential failure mechanism for such devices, namely oxidation and subsequent loss of sulphur. This degradation is important to understand, since these applications are highly property-dependent, and changes to the chemistry will result in changes in desired properties. Two approaches to study oxidisation were taken: ex situ oxidation by water and oxygen at room temperature and in situ oxidation by a 5% O 2 /Ar gas at elevated temperatures. Both sources of oxygen resulted in oxidation of the starting TiS 2 flakes, with differing morphologies. Water produced amorphous oxide slowly growing in from the edge of the flakes. Oxygen gas at ≥375°C produced crystalline oxide, with a range of structures due to oxidation initiating from various regions of the observed flakes. npj 2D Materials and Applications (2017) 1:22 ; doi:10.1038/s41699-017-0024-4 INTRODUCTION Titanium (IV) sulphide, TiS 2 , is a candidate for applications in a range of future technologies, including catalytic substrates and the splitting of water, supercapacitors and energy storage devices. TiS 2 is a layered transition metal dichalcogenide (TMD) with hexagonal crystal symmetry and takes the 1T phase and is relatively under explored in two-dimensional form. Each layer consists of three sheets of atoms: the two outer planes are sulphur, coordinated to three titanium atoms with a trigonal pyramidal geometry; the middle plane is titanium and each atom takes octahedral coordination to six sulphur atoms. These atomic sheets are stacked ABC (Supplemental Information Fig. 1), while the layers themselves stack AA in the 1T phase.The excellent capacitive properties of bulk TiS 2 (high energydensity and power-density 1, 2 and excellent electronic conductivity 3 ) have attracted interest since the 1970s, with bulk TiS 2 used as a cathode material in lithium-metal/alloy anode batteries, where lithium metal ions were intercalated, transferring charge to reduce titanium 3d orbitals and causing reduction from Ti 4+ to Ti 3+ (refs. 4, 5). High rates of charging and discharging were demonstrated with near-perfect reversibility. In addition, the material forms a single phase with lithium (Li x TiS 2 ) over the entirety of the range 0 ≤ x ≤ 1, avoiding the need for phase changes upon (de-) lithiation which removes much of the strain induced in cycling, prolonging battery life. However, TMD/Lithium-metal batteries were withdrawn from consumers due to accidents in 1989 where the metallic lithium caught fire as a consequence of shortcircuiting due to lithium-dendrite growth.

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Single-crystalline ultrathin 2D TiO2 nanosheets: A bridge towards superior photovoltaic devices

Cited by 71 publications

References 39 publications

Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

The Influence of Acids on Tuning the Pore Size of Mesoporous TiO₂ Templated by Non‐Ionic Block Copolymers

An in situ and ex situ TEM study into the oxidation of titanium (IV) sulphide

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Single-crystalline ultrathin 2D TiO2 nanosheets: A bridge towards superior photovoltaic devices

Cited by 71 publications

References 39 publications

Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

The Influence of Acids on Tuning the Pore Size of Mesoporous TiO2 Templated by Non‐Ionic Block Copolymers

An in situ and ex situ TEM study into the oxidation of titanium (IV) sulphide

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The Influence of Acids on Tuning the Pore Size of Mesoporous TiO₂ Templated by Non‐Ionic Block Copolymers