Targeted Synthesis of 2H‐ and 1T‐Phase MoS<sub>2</sub> Monolayers for Catalytic Hydrogen Evolution

Chang, Kun; Hai, Xiao; Pang, Hong; Zhang, Huabin; Shi, Li; Liu, Guigao; Liu, Huimin; Zhao, Guixia; Li, Mu; Ye, Jinhua

doi:10.1002/adma.201603765

Cited by 551 publications

(383 citation statements)

References 47 publications

(70 reference statements)

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“…[10] Thew et processing of the bulk materiali st he most efficient top-down route to obtain high quality monolayers on al arge scale. [14] Bulk MoS 2 is organized in at rigonal prismatic (2H) phase, in which each Mo atom is bound to six Sa toms, resulting in a Mo plane sandwiched by two Sp lanes (Scheme 1), practically formingathree-atom thick monolayer.I nt he case of chemical exfoliation with strong intercalants, that is, Li + , aphase transfer to an octahedral (1T) polytype takes place and the properties of the exfoliated nanosheets turn metallic, in contrast to the semiconducting bulk material. [12] Concerning bottom-up approaches,c hemical vapor deposition (CVD) is an alternative way to access monolayers with large surface, that is, tens of microns, for fabricating nano-and mirco-devices, [13] although transfer of the as-prepared deposited MoS 2 monolayers from the metal substrate togetherw ith the presence of the structural defects are drawbacks for consideration.…”

Section: Introductionmentioning

confidence: 99%

Molecular Functionalization of Two‐Dimensional MoS₂ Nanosheets

Stergiou

Tagmatarchis

2018

Chemistry A European J

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Conversely,d eveloped strategies for the edge and in-plane covalent functionalization of MoS 2 mainly concern chemistry at Sv acancies, direct CÀSb ond formation, and coordination of Se dges at metal centers. Herein, we focus into the most representative molecular doping strategies and material designing of MoS 2 -based hybridn anostructuresc arrying photo-and/ore lectro-active components.K ey points related with the exfoliation routes, the surface functionalization approachesa nd their impact on the electronic properties of the functionalized nanosheets are comprehensively discussed, offering at oolbox for scientists of different disciplines interested in putting as tep forwardi nt he field of transition-metal dichalcogenide-based materials.The ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

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Section: Introductionmentioning

confidence: 99%

Molecular Functionalization of Two‐Dimensional MoS₂ Nanosheets

Stergiou

Tagmatarchis

2018

Chemistry A European J

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“…However, practical application of Pt-based cocatalysts is limited by their scarcity and high cost. [18][19][20] Thus, designing novel materials which can address these problems may lead to the discovery of non-noble metal cocatalysts with enhanced performance. A large number of transition metals (e.g., iron, cobalt, nickel, molybdenum, and tungsten) and their derivative compounds have been studied.…”

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confidence: 99%

Ultrasmall MoO_x Clusters as a Novel Cocatalyst for Photocatalytic Hydrogen Evolution

et al. 2018

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of semiconductor photocatalysts to retard the recombination of charge carriers and enhance surface reaction rates. [13][14][15] Among various kinds of cocatalysts, Pt often shows the best performance. However, practical application of Pt-based cocatalysts is limited by their scarcity and high cost. [16] Therefore, development of highly active and cost-efficient alternatives to Pt is urgently needed. A large number of transition metals (e.g., iron, cobalt, nickel, molybdenum, and tungsten) and their derivative compounds have been studied. Fu and colleagues have integrated CdS with MoS 2 and obtained much improved hydrogen evolution activity. [17] However, the performances of which are still far from satisfactory because of the low active surface areas and sluggish separation of electron-hole pairs. [18][19][20] Thus, designing novel materials which can address these problems may lead to the discovery of non-noble metal cocatalysts with enhanced performance. Metal oxide clusters, constructed by a small number of atoms, can largely expose active metal sites. [21] Moreover, when loaded onto semiconductor photocatalysts, metal oxide clusters can induce discrete energy bands to trap charge carriers and promote the separation of electrons and holes. Regarding such unique properties, cluster cocatalysts show the potential to boost the activity of semiconductor photocatalysts for solar water splitting.The performance of cluster cocatalysts is significantly influenced by the number and coordination environment of the active atoms. [22][23][24] Therefore, it is essential to establish a synthetic method to precisely control the configuration of clusters decorated on the surface of semiconductor photocatalysts at atomic level. [25,26] Herein, a bottom-up strategy is developed to decorate ultrasmall molybdenum-oxygen (MoO x ) clusters onto the surface of CdS nanowires (NWs). The decorated clusters with finely controlled size and configuration greatly enhance the photocatalytic H 2 evolution efficiency of CdS NWs.CdS NWs are first synthesized through a solvothermal approach. [27] X-ray diffraction (XRD) pattern of as-prepared sample shows characteristic peaks of CdS with hexagonal wurtzite crystal structure ( Figure S1, Supporting Information). Field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), and high-resolution TEM (HRTEM) images indicate the successful synthesis of CdS NWs with good crystallinity (Figure S2, Supporting Information). The average diameter of the CdS NWs is about 75 nm (Figure S3, Supporting Information). MoO x clusters are then decorated To enhance the performance of semiconductor photocatalysts, cocatalysts are used to accelerate surface reactions. Herein, ultrasmall molybdenumoxygen (MoO x ) clusters are developed as a novel non-noble cocatalyst, which significantly promotes the photocatalytic hydrogen generation rate of CdS nanowires (NWs). As indicated by extended X-ray absorption fine structure analysis, direct bonds are formed between CdS NWs and MoO x clusters,...

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“…[2,29,48] The specific capacity of NCM-NC hybrids is enhanced to 1720.6 mAh g À1 at 0.2 Ag À1 after 317 cycles (Figure6d). [42] 4) The crystal structure of NCM-NC hybridsi ss ignificantly improved, and the interlayer spacingo ft he MoS 2 phase is enlarged after cycling (Figure S7 d,e in the Supporting Information).T he SEM image ( Figure S7 ci nt he Supporting Information) illustrates that the structure of the NCM-NC hybrids after 200 cycles basically remained intact, and NCM-NC particles were still firmly bound together without clear disruption. [29] 2) The electrode wasg radually crushedd uring cycling to form fragments that could reduce the diffusion distance and path of lithium ions.…”

Section: Resultsmentioning

confidence: 94%

“…[16,23] The peak located at 225.9 eV is related to S 2s. [42,43] The signal centered at 169.1 eV is ascribed to the SÀOb ond, which indicates hollow NCM-NC hybridsw itht he MoOS x phase. [40,42] In the S2ps pectrum, two strong peaks at 161.6 and 162.7 eV result from S2p 3/2 and S2p 3/2 of S-Mo-S,r espectively ( Figure 4e).…”

Section: Resultsmentioning

confidence: 99%

“…[5] The Mo 3d spectrum (Figure 4d)o fN CM-NC hybrids, with severalp eaks centered at 228.9, 232.0, 229.7, and 235.3 eV,c orrespondingt oM o 4 + 3d 5/2 and Mo 4 + 3d 3/2 of the MoS 2 phase and Mo 6 + 3d 5/2 and Mo 6 + 3d 3/2 of MoO 3 phase, respectively. [40,42] In the S2ps pectrum, two strong peaks at 161.6 and 162.7 eV result from S2p 3/2 and S2p 3/2 of S-Mo-S,r espectively ( Figure 4e). [25,41] Interestingly,t he peak of Mo 4 + 3d 3/2 moves about 1eV to lower binding energy,w hich also shows the presence of 1Tphase MoS 2 in the NCM-NC hybrids.…”

Section: Resultsmentioning

confidence: 99%

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Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO₃/MoS₂ Hybrids for Improved‐Performance Lithium‐Ion Batteries

Hou

Liu

et al. 2020

Chemistry A European J

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Improving the performance of anode materials for lithium-ion batteries (LIBs) is ah otly debated topic. Herein, hollow NiÀCo skeleton@MoS 2 /MoO 3 nanocubes (NCM-NCs), with an average size of about1 93 nm, have been synthesized through af acile hydrothermal reaction. Specifically, MoO 3 /MoS 2 composites are grown on NiÀCo skeletons derived from nickel-cobaltP russian blue analogue nanocubes (NiÀCo PBAs). The NiÀCo PBAs were synthesized through a precipitation method and utilized as self-templates that provided al arger specific surface area for the adhesion of MoO 3 /MoS 2 composites. According to Raman spectroscopy results,a s-obtained defect-richM oS 2 is confirmed to be a metallic 1T-phase MoS 2 .F urthermore, the average particle size of NiÀCo PBAs ( % 43 nm) is only about one-tenth of the previously reported particles ize ( % 400 nm). If assessed as anodes of LIBs, the hollow NCM-NC hybrids deliver an excellent rate performance and superiorc ycling performance (with an initial discharge capacity of 1526.3 mAh g À1 and up to 1720.6 mAh g À1 after 317 cycles under ac urrent density of 0.2 Ag À1 ). Meanwhile, ultralong cycling life is retained, even at high current densities (776.6 mAh g À1 at 2Ag À1 after 700 cycles and 584.8 mAh g À1 at 5Ag À1 after 800 cycles). Moreover,a tarate of 1Ag À1 ,t he average specific capacity is maintained at 661 mAh g À1 .T hus,t he hierarchical hollow NCM-NC hybridsw ith excellent electrochemical performance are ap romising anodem aterial for LIBs.[a] J.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Targeted Synthesis of 2H‐ and 1T‐Phase MoS₂ Monolayers for Catalytic Hydrogen Evolution

Cited by 551 publications

References 47 publications

Molecular Functionalization of Two‐Dimensional MoS₂ Nanosheets

Molecular Functionalization of Two‐Dimensional MoS₂ Nanosheets

Ultrasmall MoO_x Clusters as a Novel Cocatalyst for Photocatalytic Hydrogen Evolution

Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO₃/MoS₂ Hybrids for Improved‐Performance Lithium‐Ion Batteries

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Targeted Synthesis of 2H‐ and 1T‐Phase MoS2 Monolayers for Catalytic Hydrogen Evolution

Cited by 551 publications

References 47 publications

Molecular Functionalization of Two‐Dimensional MoS2 Nanosheets

Molecular Functionalization of Two‐Dimensional MoS2 Nanosheets

Ultrasmall MoOx Clusters as a Novel Cocatalyst for Photocatalytic Hydrogen Evolution

Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO3/MoS2 Hybrids for Improved‐Performance Lithium‐Ion Batteries

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Targeted Synthesis of 2H‐ and 1T‐Phase MoS₂ Monolayers for Catalytic Hydrogen Evolution

Molecular Functionalization of Two‐Dimensional MoS₂ Nanosheets

Molecular Functionalization of Two‐Dimensional MoS₂ Nanosheets

Ultrasmall MoO_x Clusters as a Novel Cocatalyst for Photocatalytic Hydrogen Evolution

Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO₃/MoS₂ Hybrids for Improved‐Performance Lithium‐Ion Batteries