High-quality vanadium-doped MoS<sub>2</sub> ultrathin nanosheets as an efficient ORR catalyst

He, Tianyu; Xu, Ling; Zhang, Ying; Huang, Hao; Jiang, Huan

doi:10.1039/c8nj05365k

Cited by 28 publications

(14 citation statements)

References 31 publications

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“…Additionally, it was noted that E 1 2g and A 1g peaks for Mo 0.75 V 0.25 S 2 became broader and weaker, suggesting that the vanadium dopant might have caused some disruption to the MoS 2 crystal structure. [ 31,39–41 ] In Figure 3b, distinct peaks at ≈284 and ≈242 cm −1 , corresponding to the in‐plane E 1 2g and out‐of‐plane A 1g vibrational modes of MoSe 2 were noted, which corroborate well with the literature values for multilayered MoSe 2 . [ 34,42,43 ] Last, peaks at ≈162, ≈118, and ≈227 cm −1 corresponding to A 1g , E 1g , and E 1 2g of MoTe 2 were observed for the V‐doped MoTe 2 .…”

Section: Resultssupporting

confidence: 85%

Vanadium Dopants: A Boon or a Bane for Molybdenum Dichalcogenides‐Based Electrocatalysis Applications

Chia

Mayorga‐Martinez

Sofer

et al. 2020

Adv Funct Materials

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The ever‐rising concerns with regards to energy shortages and climate change have made the search for clean and renewable energy sources a pressing priority for the sustainable development of societies. Although, conventional precious metal‐based catalysts such as platinum, iridium, and ruthenium are able to efficiently catalyze the conversion of chemical to electrical energy, they are often very costly, scarce, and suffer from poor stability, hence impeding their widespread applications. The limitations of the current state‐of art catalysts have propelled tremendous efforts in search for alternative catalysts. Notably, transition metal dichalcogenides (TMDs) have spurred much enthusiasm because of their natural abundance, low cost, and remarkable catalytic activity. Numerous studies have recounted that doping can tune the properties of TMDs and that vanadium dopants reportedly improve the electrical properties of Group 6 TMDs. Herein, the authors aspire to investigate the effects of doping varying amounts of vanadium on molybdenum dichalcogenides on their electrocatalytic activities toward hydrogen evolution reaction, oxygen evolution reaction, and oxygen reduction reaction. Despite previous studies bespeaking promising effects, the results here demonstrate both improvements and worsening of electrocatalytic performances from varying the stoichiometry of vanadium dopants in molybdenum dichalcogenides, depending on the type of materials and intended electrochemical applications.

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Section: Resultssupporting

confidence: 85%

Vanadium Dopants: A Boon or a Bane for Molybdenum Dichalcogenides‐Based Electrocatalysis Applications

Chia

Mayorga‐Martinez

Sofer

et al. 2020

Adv Funct Materials

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“…Recent theories suggest that dopants can mediate the interlayer chemical bond of layer-structured material. , Thus, it offers a promising approach to modifying the interlayer coupling and accessing the layer-dependent physical properties in MoS 2 material. Vanadium (V)-doped MoS 2 has been synthesized by several methods ( e.g ., solvothermal, hydrothermal, solid-state reaction, chemical vapor transport) for various applications, such as Li-ion battery anodes and HER and ORR electrocatalysts. − In this work, we demonstrate strikingly different electrical transport characteristics in V-doped monolayer and bilayer devices fabricated on the same MoS 2 flakes grown by chemical vapor deposition (CVD). The V dopant not only leads to an ambipolar transport in the monolayer region and a heavy p -type field-effect characteristic in bilayer MoS 2 region, but also drastically enhances the electrical conductance of the bilayer over the monolayer MoS 2 device.…”

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confidence: 88%

Tuning Electrical Conductance in Bilayer MoS₂ through Defect-Mediated Interlayer Chemical Bonding

et al. 2020

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Interlayer interaction could substantially affect the electrical transport in transition metal dichalcogenides, serving as an effective way to control the device performance. However, it is still challenging to utilize interlayer interaction in weakly interlayer-coupled materials such as pristine MoS2 to realize layer-dependent tunable transport behavior. Here, we demonstrate that, by substitutional doping of vanadium atoms in the Mo sites of the MoS2 lattice, the vanadium-doped monolayer MoS2 device exhibits an ambipolar field effect characteristic, while its bilayer device demonstrates a heavy p-type field effect feature, in sharp contrast to the pristine monolayer and bilayer MoS2 devices, both of which show similar n-type electrical transport behaviors. Moreover, the electrical conductance of the doped bilayer MoS2 device is drastically enhanced with respect to that of the doped monolayer MoS2 device. Employing first-principle calculations, we reveal that such striking behaviors arise from the presence of electrical transport networks associated with the enhanced interlayer hybridization of S-3p z orbitals between adjacent layers activated by vanadium dopants in the bilayer MoS2, which is nevertheless absent in its monolayer counterpart. Our work highlights that the effect of dopant not only is confined in the in-plane electrical transport behavior but also could be used to activate out-of-plane interaction between adjacent layers in tailoring the electrical transport of the bilayer transitional metal dichalcogenides, which may bring different applications in electronic and optoelectronic devices.

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“…[89]. In addition, Urbanova et al and He each incorporated metal elements such as Fe, Mn, Ti, and V into MoS 2 and found a significant improvement in ORR activity (Figure 9A,B) [90,91]. Although much work has been done on the direction of metal doping in MoS 2 , the choice of metal types is a simple try-out method.…”

Section: Controlling Electronicmentioning

confidence: 99%

“…Therefore, how to overcome these difficulties is crucial to enhance the ORR performance of metal-doped MoS 2 . 9A,B) [90,91]. Although much work has been done on the direction of metal doping in MoS2, the choice of metal types is a simple try-out method.…”

Section: Controlling Electronicmentioning

confidence: 99%

Two-Dimensional MoS2: Structural Properties, Synthesis Methods, and Regulation Strategies toward Oxygen Reduction

Zhu

et al. 2021

Micromachines

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Compared with three-dimensional (3D) and other materials, two-dimensional (2D) materials with unique properties such as high specific surface area, structurally adjustable band structure, and electromagnetic properties have attracted wide attention. In recent years, great progress has been made for 2D MoS2 in the field of electrocatalysis, and its exposed unsaturated edges are considered to be active sites of electrocatalytic reactions. In this review, we focus on the latest progress of 2D MoS2 in the oxygen reduction reaction (ORR) that has not received much attention. First, the basic properties of 2D MoS2 and its advantages in the ORR are introduced. Then, the synthesis methods of 2D MoS2 are summarized, and specific strategies for optimizing the performance of 2D MoS2 in ORRs, and the challenges and opportunities faced are discussed. Finally, the future of the 2D MoS2-based ORR catalysts is explored.

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High-quality vanadium-doped MoS₂ ultrathin nanosheets as an efficient ORR catalyst

Abstract: Ultrathin vanadium-doped MoS2 nanosheets are achieved via a simple thermolytic method, which exhibit enhanced catalytic ability for ORR catalysis.

Cited by 28 publications

References 31 publications

Vanadium Dopants: A Boon or a Bane for Molybdenum Dichalcogenides‐Based Electrocatalysis Applications

Vanadium Dopants: A Boon or a Bane for Molybdenum Dichalcogenides‐Based Electrocatalysis Applications

Tuning Electrical Conductance in Bilayer MoS₂ through Defect-Mediated Interlayer Chemical Bonding

Two-Dimensional MoS2: Structural Properties, Synthesis Methods, and Regulation Strategies toward Oxygen Reduction

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High-quality vanadium-doped MoS2 ultrathin nanosheets as an efficient ORR catalyst

Abstract: Ultrathin vanadium-doped MoS2 nanosheets are achieved via a simple thermolytic method, which exhibit enhanced catalytic ability for ORR catalysis.

Cited by 28 publications

References 31 publications

Vanadium Dopants: A Boon or a Bane for Molybdenum Dichalcogenides‐Based Electrocatalysis Applications

Vanadium Dopants: A Boon or a Bane for Molybdenum Dichalcogenides‐Based Electrocatalysis Applications

Tuning Electrical Conductance in Bilayer MoS2 through Defect-Mediated Interlayer Chemical Bonding

Two-Dimensional MoS2: Structural Properties, Synthesis Methods, and Regulation Strategies toward Oxygen Reduction

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High-quality vanadium-doped MoS₂ ultrathin nanosheets as an efficient ORR catalyst

Tuning Electrical Conductance in Bilayer MoS₂ through Defect-Mediated Interlayer Chemical Bonding