A heterostructured WS2/WSe2 catalyst by heterojunction engineering towards boosting hydrogen evolution reaction

Sun, Lei; Xu, Huizhong; Cheng, Zhipeng; Zheng, Dehua; Zhou, Qiannan; Yang, Shikuan; Lin, Jianjian

doi:10.1016/j.cej.2022.136348

Cited by 38 publications

(14 citation statements)

References 41 publications

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“…Among them, designing a two-dimensional (2D) heterostructure (especially the synergistic effect–the positive complementarity of structure and function between components) would be a simple and effective way, which can simultaneously provide more active sites and increase the conductivity of the catalyst. For example, the reported heterostructures of Co 3 O 4 /MoS 2 , MoSe 2 /MoS 2 , CoS 2 /MoS 2 , WS 2 /WSe 2 and Ni 2 P/WS 2 /Co 9 S 8 @C have shown superior performances of the HER process. The constructed heterojunctions with porous spaces offer more exposed edge sites and more rapid charge transfer.…”

Section: Introductionmentioning

confidence: 99%

Dual Co_xS_y-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Xia

Wang

Pan

et al. 2023

ACS Appl. Mater. Interfaces

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The rational design and preparation of a heterogeneous electrocatalyst for hydrogen evolution reaction (HER) has become a research hotspot, while applicable and pH-universal tungsten disulfide (WS 2 )-based hybrid composites are rarely reported. Herein, we propose a novel hybrid catalyst (WS 2 / Co 9 S 8 /Co 4 S 3 ) comprising two heterojunctions of WS 2 /Co 4 S 3 and WS 2 /Co 9 S 8 , which grow on the porous skeleton of Co, N-codoped carbon (Co/NC) flexibly applicable to all-pH electrolytes. The effect of double heterogeneous coupling on HER activity is explored as the highly flexible heterojunction is conducive to tune the activity of the catalyst, and the synergistic interaction of the double heterojunctions is maximized by adjusting the proportion of heterojunction components. Theoretical calculations show that both WS 2 /Co 9 S 8 and WS 2 /Co 4 S 3 heterojunctions have a Gibbs free energy of H reaction (|ΔG H* |) close to 0.0 eV and a facile decomposition water barrier. As collective synergy of dual Co x S y -modified WS 2 double heterojunction, WS 2 /Co 9 S 8 /Co 4 S 3 greatly enhances HER activity compared to bare Co 9 S 8 /Co 4 S 3 or single heterojunction (WS 2 /Co 9 S 8 ) in all-pH media. Besides, we have elucidated the unique HER mechanism of the double heterojunction to decompose H 2 O and confirm its excellent activity under alkaline and neutral conditions. Thus, this work provides new insights into WS 2 -based hybrid materials potentially applied to sustainable energy.

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Section: Introductionmentioning

confidence: 99%

Dual Co_xS_y-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Xia

Wang

Pan

et al. 2023

ACS Appl. Mater. Interfaces

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“…The recent literature on hazardous gas sensing also suggests the effectiveness of these 2D (hexagonal) TMDCs as promising gas-sensing candidates compared to their oxide-based counterparts. − Most of these studies are based on ultrathin or exfoliated layers of a specific TMDC, while few show investigations of layer-by-layer growth based on different heterojunctions. However, the gas-sensing mechanisms of p–p TMDC heterojunctions are rarely described.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature NO₂ Sensing of CVD-Modified WS₂–WSe₂ Heterojunctions

Moumen

Konar

Zappa

et al. 2023

ACS Appl. Nano Mater.

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semiconducting heterojunction chemical sensors are in high demand because of their enhanced response, stability, and selectivity. However, fine-tuning heterojunctions using vapor deposition growth still needs further research. Our present study focuses on the ambient pressure chemical vapor deposition (CVD) synthesis of hexagonal tungsten sulfide-tungsten selenide (WS 2 −WSe 2 ) p−p heterojunctions (as a 2D−2D arrangement). We use the liquid-phase exfoliation method to disperse bulk WS 2 and WSe 2 and decorate large flakes of WS 2 with smaller WSe 2 nanosheets in CVD. Electron microscopy and related surface investigations reveal their homogeneity on drop-casting. Two drops from the exfoliated heterojunction dispersion were drop-cast on a transducer to study the NO 2 response and related sensing properties. The sensor showed long-term stability (>2 months), even at high humidity levels (40− 90%). The gas-sensing properties of this layered p−p heterojunction-based nanocomposite strongly suggest an affinity toward NO 2 gas, leading to improved response, high stability, independent of humidity effects, and high selectivity.

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“…Recently, layered transition metal dichalcogenides (TMDCs) with the formula MX 2 (M = group IV-VII transition metal, X = S, Se, and Te) have attracted considerable attention because of their distinct thickness-dependent electronic structures and outstanding catalytic properties. [24,25] MoS 2 , as the most renowned TMDC, exhibits significant HER potential, [26] but, HER activity of unmodified MoS 2 is unsatisfactory over a wide pH range because of inefficient H 2 O cleavage and sluggish H desorption. For all MX 2 2D electrocatalysts, the limited edge atom with unsaturated coordination is the HER active site, whereas the entire inert basal plane is considered to be the origin of the restricted HER activity.…”

Section: Introductionmentioning

confidence: 99%

Spatial Relation Controllable Di‐Defects Synergy Boosts Electrocatalytic Hydrogen Evolution Reaction over VSe₂ Nanoflakes in All pH Electrolytes

Zhang

Huang

et al. 2022

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the Chinese government. However, the electro catalytic HER suffers from sluggish kinetics, high cost of catalysts and technologies, and instability at certain pH electrolytes due to the scarcity of highperformance earth-abundant catalysts. Although the HER performance of catalysts can optimize by adjusting the acidity of the electrolyte, designing the pseudo-pH-independent electrocatalysts may make the water electrolyzers more affordable and safer for the commercial development of hydrogen energy applications. [2] As a water electrolysis benchmark, precious metal electrocatalyst (Pt) possesses excellent activity overall pH values toward HER, but difficulty in industrialization for its scarcity and high cost. [3][4][5] To date, many nonprecious metal-based HER catalysts with high performance in certain electrolytes have been reported, including transition metal sulfides, [6] selenides, [7][8][9][10][11][12][13][14][15][16][17][18] carbides, [19,20] phosphides, [21,22] and thiopho sphates. [23] However, most developed catalysts deliver attractive HER performance only under acidic conditions, limiting their practical applications. Accordingly, the exploration of pH-universal HER electrocatalysts with competitive Defect engineering of transition metal dichalcogenides (TMDCs) is important for improving electrocatalytic hydrogen evolution reaction (HER) performance. Herein, a facile and scalable atomic-level di-defect strategy over thermodynamically stable VSe 2 nanoflakes, yielding attractive improvements in the electrocatalytic HER performance over a wide electrolyte pH range is reported. The di-defect configuration with controllable spatial relation between single-atom (SA) V defects and single Se vacancy defects effectively triggers the electrocatalytic HER activity of the inert VSe 2 basal plane. When employed as a cathode, this di-defects decorated VSe 2 electrocatalyst requires overpotentials of 67.2, 72.3, and 122.3 mV to reach a HER current density of 10 mA cm −2 under acidic, alkaline, and neutral conditions, respectively, which are superior to most previously reported non-noble metal HER electrocatalysts. Theoretical calculations reveal that the reactive microenvironment consists of two adjacent SA Mo atoms with two surrounding symmetric Se vacancies, yielding optimal water dissociation and hydrogen desorption kinetics. This study provides a scalable strategy for improving the electrocatalytic activity of other TMDCs with inert atoms in the basal plane.

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A heterostructured WS2/WSe2 catalyst by heterojunction engineering towards boosting hydrogen evolution reaction

Cited by 38 publications

References 41 publications

Dual Co_xS_y-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Dual Co_xS_y-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Room-Temperature NO₂ Sensing of CVD-Modified WS₂–WSe₂ Heterojunctions

Spatial Relation Controllable Di‐Defects Synergy Boosts Electrocatalytic Hydrogen Evolution Reaction over VSe₂ Nanoflakes in All pH Electrolytes

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A heterostructured WS2/WSe2 catalyst by heterojunction engineering towards boosting hydrogen evolution reaction

Cited by 38 publications

References 41 publications

Dual CoxSy-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Dual CoxSy-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Room-Temperature NO2 Sensing of CVD-Modified WS2–WSe2 Heterojunctions

Spatial Relation Controllable Di‐Defects Synergy Boosts Electrocatalytic Hydrogen Evolution Reaction over VSe2 Nanoflakes in All pH Electrolytes

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Dual Co_xS_y-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Dual Co_xS_y-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

Room-Temperature NO₂ Sensing of CVD-Modified WS₂–WSe₂ Heterojunctions

Spatial Relation Controllable Di‐Defects Synergy Boosts Electrocatalytic Hydrogen Evolution Reaction over VSe₂ Nanoflakes in All pH Electrolytes