Metallic 1T MoS<sub>2</sub> nanosheet arrays vertically grown on activated carbon fiber cloth for enhanced Li-ion storage performance

Wu, Minghong; Zhan, Jing; Wu, Kuan; Li, Zhen; Wang, Liang; Geng, Bijiang; Wang, Lijun; Pan, Dengyu

doi:10.1039/c7ta03497k

Cited by 263 publications

(184 citation statements)

References 53 publications

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“…Theselected-area electron-diffraction (SAED) image clearly indicates the phase transformation (Figure 2c-left), and the SAED 1D profile of the annealed sample demonstrates clearly the (100) and (106) lattice facets of 2H-MoS 2 ,w hich are pretty weak in the as-synthesized 1T-MoS 2 /NiS 2 (Figure 2c-right, Figure 2d). [21] Furthermore,the 2H phase MoS 2 in the 2H-MoS 2 /NiS 2 was confirmed through HAADF-STEM and simulation (Figure 2e,f). [15] Thec lear honeycomb lattice in the image indicates the coordinated Satoms with Mo sites overlap to be enhanced, even though the Satomic number is quite low.…”

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confidence: 76%

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

Chen,

Wang,

Wei

et al. 2019

Angew Chem Int Ed

126

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The crystal phase plays an important role in controlling the properties of an anomaterial;h owever,i ti s ag reat challenge to obtain ananomaterial with high purity of the metastable phase.F or instance,the large-scale synthesis of the metallic phase MoS 2 (1T-MoS 2 )isimportant for enhancing electrocatalytic reaction, but it can only be obtained under harsh conditions.Herein, aspatially confined template method is proposed to synthesizeh igh phase-purity MoS 2 with a1 T content of 83 %. Moreover,b oth the confined space and the structure of template will affect the purity of 1T-MoS 2 ;i nt his case,t his approach was extended to other similar spatially confined templates to obtain the high-purity material. The obtained ultrathin nanosheets exhibit good electrocatalytic activity and excellent stability in the hydrogen evolution reaction.Nanomaterials have shown various promising applications in optics, [1] catalysis, [2] and electronics, [3] owing to their unique physiochemical properties,w hich strongly depend on the crystal facet, morphology,d imension, and size.I nr ecent years,t he crystal phase has been reported as an important factor to affect the physical-chemical properties.F or exam-ple,M oS 2 is at ypical polyphase material which includes trigonal (1T), hexagonal (2H), rhombohedral (3R), and 1T' forms. [4] Among them, the unique structure of 1T phase MoS 2 endows it with am etallic-like property, [5] showing higher electrical conductivity and catalytic activity. [6] Nevertheless, the thermodynamically stable phase for MoS 2 is 2H;h ence, the metastable 1T MoS 2 can only be obtained under the harsh synthetic strategies,s uch as alkali metal intercalation-exfoliation, [7] mechanical strain, [8] and electron-beam irradiation. [6a] However,the yields of the aforementioned methods are quite low,w hich severely limits the applications of metallic-phase MoS 2 . [9] It is agreat challenge to obtain high-purity 1T MoS 2 with af acile method. [8] By using the weak interactions between hetero materials, template method is considered as an efficient route to synthesize nanomaterials with metastable phases. [10] Moreover, the confined space will significantly affect the physical and chemical properties of the insert molecules. [11] In this case,t he two-dimensional confined space may induce a2 D nanosheet with metastable phases.T herefore,b yu sing layered Ni(OH) 2 as the spatially confined template,w e successfully synthesized ultrathin MoS 2 nanosheets with the 1T phase of 83 %, which is among the highest 1T ratios obtained with the wet-chemical methods (Supporting Information, Table S1). Af urther study reveals both the space in the confined template and the crystal structure of template will affect the crystal phase of nanomaterials.M oreover,t he ratio between 1T and 2H phases can be easily controlled by adjusting the structure of templates.F urthermore,t he synthesized nanosheets showed an excellent catalytic activity and stability for the hydrogen evolution reaction (HER). Our strategy provides an ew way to...

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mentioning

confidence: 76%

High Phase‐Purity 1T‐MoS₂ Ultrathin Nanosheets by a Spatially Confined Template

Chen,

Wang,

Wei

et al. 2019

Angew Chem Int Ed

126

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“…However, the metallic MoS 2 reveals a unique (001) peak around 7.3°, which evidences an additional layer separation of 0.55–0.60 nm during restacking . This specific peak was reported and explained as an expanded layer structure in 1987 by Frindt et al followed by numerous recent researchers . The appearance of this (001) peak before 10° is the most conventional identification trait of metallic MoS 2 using XRD.…”

Section: Characterizationsmentioning

confidence: 86%

“…The same group proved that it is also possible to achieve the metallic MoS 2 in DMF without using any water by the reaction of molybdenum chloride and thioacetamide at 200 °C in autoclave . Pan et al reported that metallic MoS 2 can also be fabricated by Na 2 MoO 4 •2H 2 O and L‐cysteine in a mixed solvent of DMF and water with a DMF to water ratio of 1.5:1 at 200 °C for 12 h (Figure b). The layer distance of the as‐prepared metallic MoS 2 is around ≈0.90 nm that is much larger than the traditional layer distance of ≈0.62 nm .…”

Section: Fabrication Methods For Metallic Mos2mentioning

confidence: 95%

“…Selected area electron diffraction (SAED) pattern (Figure f) is another characterization method for MoS 2 based on HRTEM result. For metallic phase, the diffraction rings are usually weak and hazy, reflecting the low degree of crystallization …”

Section: Characterizationsmentioning

confidence: 99%

“…Metallic MoS 2 electrode can exhibit an excellent electrochemical performance owing to its significantly high intrinsic conductivity. In recent years, several types of researches have been conducted to investigate the electrochemical performance of MoS 2 for its application in batteries, supercapacitors, and HER …”

Section: Applicationsmentioning

confidence: 99%

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Metallic MoS₂ for High Performance Energy Storage and Energy Conversion

Jiao

Hafez

Cao

et al. 2018

Small

251

173

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Metallic phase 2D molybdenum disulfide (MoS ) is an emerging class of materials with remarkably higher electrical conductivity and catalytic activities. The goal of this study is to review the atomic structures and electrochemistry of metallic MoS , which is essential for a wide range of existing and new enabling technologies. The scope of this paper ranges from the atomic structure, band structure, electrical and optical properties to fabrication methods, and major emerging applications in electrochemical energy storage and energy conversion. This paper also thoroughly covers the atomic structure-properties-application relationships of metallic MoS . Understanding the fundamental properties of these structures is crucial for designing and manufacturing products for emerging applications. Today, a more holistic understanding of the interplay between the structure, chemistry, and performance of metallic MoS is advancing actual applications of this material. This new level of understanding also enables a myriad of new and exciting applications, which motivated this review. There are excellent reviews already on the traditional semiconducting MoS , and this review, for the first time, focuses on the uniqueness of conducting metallic MoS for energy applications and offers brand new materials for clean energy application.

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