Metallic Transition Metal Dichalcogenides of Group VIB: Preparation, Stabilization, and Energy Applications

Li, Yihui; Wang, Menglei; Yi, Yuyang; Lu, Chen; Dou, S. X.; Sun, Jingyu

doi:10.1002/smll.202005573

Cited by 20 publications

(25 citation statements)

References 325 publications

(523 reference statements)

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“…Triethylamine can transfer charge to WSe 2 because triethylamine is a strong electron donor due to its lone-pair electrons of N . When the electrons are transferred to WSe 2 , triethylamines will be rapidly protonated for charge neutralization, which means that negatively charged WSe 2 can be protected with positive triethylammonium cations. ,− When an extra electron is introduced into W metal, the electron distribution of the d-orbital in W has lower energy configurations in octahedral (1T) and distorted octahedral (1T′) than in the trigonal prismatic 2H phase . As 1T′ WSe 2 has a relatively lower formation energy than 1T WSe 2 , 1T′ WSe 2 can be preferentially formed instead of 1T WSe 2 during synthesis .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of 1T WSe₂ on an Oxygen-Containing Substrate Using a Single Precursor

Park¹,

Hwang³

et al. 2022

ACS Nano

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The metallic property of metastable 1T′ WSe2 and its promising catalytic performance have attracted considerable interest. A hot injection method has been used to synthesize 1T′ WSe2 with a three-dimensional morphology; however, this method requires two or more precursors and long-chain ligands, which inhibit the catalytic performance. Here, we demonstrate the synthesis of 1T′ WSe2 on a substrate by a simple heating-up method using a single precursor, tetraethylammonium tetraselenotungstate [(Et4N)2WSe4]. The triethylamine produced after the reaction is an electron donor that yields negatively charged WSe2, which is stabilized by triethylammonium cations as intercalants between layers and induces 1T′ WSe2. The purity of 1T′ WSe2 is higher on oxygen-containing crystalline substrates than amorphous substrates because the strong adhesion between WSe2 and the substrate can produce sufficient triethylammonium (TEA) intercalation. Among the oxygen-containing crystal substrates, the substrate with a lower lattice mismatch with 1T′ WSe2 showed higher 1T′ purity due to the uniform TEA intercalation. Furthermore, 1T′ WSe2 on carbon cloth exhibited a more enhanced catalytic performance in the hydrogen evolution reaction (197 mV at 10 mA/cm2) than has been reported previously.

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Section: Resultsmentioning

confidence: 99%

Synthesis of 1T WSe₂ on an Oxygen-Containing Substrate Using a Single Precursor

Park¹,

Hwang³

et al. 2022

ACS Nano

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“…Therefore, some easily oxidizable catalysts could also show excellent catalytic performance, such as transition metal phosphides , [ 25 ] selenides, [ 26 ] and sulfides. [ 27 ] The most critical indicator for OER activity is the bonding strength of M‐O in the intermediate groups during the OER process. The weak M‐O bond strength would lead to the difficult formation of the intermediate groups, while the strong M‐O bond strength would make the intermediate groups too stable, which is not conducive to the next reaction.…”

Section: Fundamentals Of Water Electrolysismentioning

confidence: 99%

Surface Reconstruction of Water Splitting Electrocatalysts

Zeng

Zhao

Huang

et al. 2022

Advanced Energy Materials

153

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Gibbs free energy (ΔG) of water splitting reaction is 237.2 kJ mol −1 , corresponding to a theoretical voltage of 1.23 V. [3] However, the existence of electrochemical/concentration polarization and solution resistance can increase the actual voltage of water electrolysis to much beyond 1.23 V. Particularly, the OER involves a complicated four-electron transfer process, which results in a sluggish kinetics thus has long been the bottleneck. [4] Therefore, it is necessary to explore efficient and robust electrocatalysts to reduce the overpotential of water electrolysis and the extra electric energy consumption. Although noble electrocatalysts, such as Pt, RuO 2 and IrO 2 , are recognized as the most efficient electrocatalysts for water electrolysis, their high scarcity and instability severely impede large-scale applications. [5] Recently, considerable effort has been focused on nonnoble transition-metal materials as viable alternatives for water splitting. Understanding the intrinsic catalytic mechanism and real active sites of these catalysts will benefit the rational design and application of high-efficiency catalysts.With the development of in situ characterization technologies, more reports have revealed that the original electrocatalyst (so-called "pre-catalyst") surface sites would undergo dynamic reconstruction and transform into real reactive species. [6] This in situ reconstruction process could tune the electrocatalytic behaviors such as adsorption, activation, and desorption, thus improving the catalytic performance. [7] On this basis, many researchers utilized the pre-reconstruction of electrocatalysts to obtain a large number of active species for the catalytic reactions. [8] It has been found that the intrinsic properties of the pre-catalysts, such as composition, atomic arrangement, porosity, and crystallinity, would affect the reconstruction rate, reconstruction degree, and catalytic activity of the reconstructed species. [9] Moreover, the reaction conditions also affect the reconstruction process, such as electrochemical operation, applied potential, electrolyte concentration, and pH. [6a] Therefore, tuning the reconstruction process to generate abundant active sites with high intrinsic activity is an effective strategy to boost the catalytic performance of electrocatalysts.Although some influential review articles on the reconstruction of catalysts during water electrolysis have emerged, [10] most of them focus on the discovery and characterization of the reconstruction phenomenon, less on the regulation of the reconstruction process. In addition, reconstructed catalysts for Water electrolysis is regarded as an efficient and green method to produce hydrogen gas, a clean energy carrier that holds the key to solving global energy problems. So far, the efficiency and large-scale application of water electrolysis are restricted by the electrocatalytic activity of applied catalysts. Recently, the reconstruction phenomenon of electrocatalysts during a catalytic reaction has been discovered, which ...

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“…The 4d orbitals of the Mo atoms of Mo‐based TMDs with 2H phase structure can be split by the trigonal prismatic ligand field, whereas those of the Mo atoms of Mo‐based TMDs with 1T phase structure are triply degenerated, resulting in different electron distributions between phases. [ 30 ] This unique electron arrangement conferred Mo‐based TMDs negligible bandgaps and excellent conductivity (the conductivity of 1T MoS 2 is ≈10 7 times higher than that of 2H MoS 2 ), which favors its applications in energy storage devices. [ 31 ] Nevertheless, the typical phase of almost all group VIB TMDs (except for WTe 2 ) is 2H (Figure 2f).…”

Section: Properties and Preparations Of Mose2mentioning

confidence: 99%

Molecular Engineering Strategies toward Molybdenum Diselenide Design for Energy Storage and Conversion

Wang

Sun

2022

Advanced Energy Materials

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The development of graphene has readily accelerated the research progress on 2D materials. As a representative 2D family, transition metal dichalcogenides are widely used in the realms of energy storage and conversion. In particular, molybdenum diselenide (MoSe2) has captured widespread interests owing to its unique physical and chemical properties and remarkable potential in energy applications. Nevertheless, typically, the electrochemical property of pristine MoSe2 does not meet the expectations, which necessitates the exploration and applications of proper modification strategies to achieve its full potential. Herein, several state‐of‐the‐art molecular engineering strategies are summarized, and their energy‐oriented applications are described. Furthermore, insightful information on the significance of molecular engineering methods in improving the electrochemical properties of MoSe2 and perspectives on the future developments of MoSe2 are presented. It is anticipated that the research community can use the information in this review to improve the electrochemical properties of MoSe2 targeting practical application scenarios.

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Metallic Transition Metal Dichalcogenides of Group VIB: Preparation, Stabilization, and Energy Applications

Cited by 20 publications

References 325 publications

Synthesis of 1T WSe₂ on an Oxygen-Containing Substrate Using a Single Precursor

Synthesis of 1T WSe₂ on an Oxygen-Containing Substrate Using a Single Precursor

Surface Reconstruction of Water Splitting Electrocatalysts

Molecular Engineering Strategies toward Molybdenum Diselenide Design for Energy Storage and Conversion

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Metallic Transition Metal Dichalcogenides of Group VIB: Preparation, Stabilization, and Energy Applications

Cited by 20 publications

References 325 publications

Synthesis of 1T WSe2 on an Oxygen-Containing Substrate Using a Single Precursor

Synthesis of 1T WSe2 on an Oxygen-Containing Substrate Using a Single Precursor

Surface Reconstruction of Water Splitting Electrocatalysts

Molecular Engineering Strategies toward Molybdenum Diselenide Design for Energy Storage and Conversion

Contact Info

Product

Resources

About

Synthesis of 1T WSe₂ on an Oxygen-Containing Substrate Using a Single Precursor

Synthesis of 1T WSe₂ on an Oxygen-Containing Substrate Using a Single Precursor