Role of Sulfur Vacancies and Undercoordinated Mo Regions in MoS<sub>2</sub> Nanosheets toward the Evolution of Hydrogen

Li, Lei; Qin, Zhaodan; Ries, Lucie; Hong, Song; Michel, Thierry; Yang, Jieun; Salameh, Chrystelle; Bechelany, Mikhaël; Miele, Philippe; Kaplan, Daniel; Chhowalla, Manish; Voiry, Damien

doi:10.1021/acsnano.9b01583

Cited by 462 publications

(395 citation statements)

References 81 publications

(203 reference statements)

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“…This means the S deficiency in MoS 2 /EEBP heterostructure, which would also provide more activity sites in the MoS 2 /EEBP. [24] In addition, transmission electron microscope (TEM) image shown in Figure 1d also demonstrates that the EEBP nanosheets are uniform and thin. And the high-resolution TEM (HRTEM) image in Figure 1e displays the crystal distance of 0.216 nm corresponding to (002) plane of BP.…”

Section: Resultsmentioning

confidence: 94%

Scalable Synthesis of a MoS₂/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

et al. 2020

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The exploration and scalable synthesis of the earth-abundant and excellent electrocatalysts without noble metal are crucial to the future hydrogen production and application. Herein, an affordable electrocatalyst is built through an in-situ growth of MoS 2 nanosheets vertically on the electro-exfoliated black phosphorus (EEBP) for hydrogen evolution reaction (HER). The electro-exfoliation achieves the high-yield production of fewlayer BP lamellae from its bulk crystal, hosting the scalable synthesis of uniform MoS 2 /EEBP heterostructure. Moreover, the vertical growth manner can effectively aggrandize the exposed MoS 2 edge sites and probably advance the catalytic activity to a certain extent. As for HER, such a MoS 2 /EEBP heterostructure exhibits promising catalytic performance with low overpotentials of 126 mV, 237 mV and 258 mV at 10 mA cm À 2 (η 10 ) as well as low Tafel slopes in both acid, alkaline and neutral media, respectively. The rationales behind the satisfactory catalytic properties are explained by density functional theory (DFT) calculations. Theoretically, it is revealed that the MoS 2 /EEBP heterostructure with a more neutral hydrogen adsorption energy can benefit the electrons migration and boost the water dissociation kinetics. This study presents an effective method to design and fabricate highly efficient heterostructure electrocatalysts through interface engineering towards hydrogen production.[a] T.

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Section: Resultsmentioning

confidence: 94%

Scalable Synthesis of a MoS₂/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

et al. 2020

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“…Copyright 2019 American Chemical Society. [36] (d) Density of states (DOS) of MoS 2 with single S-vacancies at concentrations of 0-18.75% and different agglomeration at a concentration of 12.50%. Copyright 2020 American Chemical Society.…”

Section: Increasing Active Edge Sitesmentioning

confidence: 99%

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

Cheng

Song

et al. 2020

Chemistry An Asian Journal

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MoS 2 have recently emerged as alternatives to noble metals as electrocatalysts for the hydrogen evolution reaction (HER) owing to their abundance and low cost. Considering the shortcomings of MoS 2 , including insufficient active sites, inert basal plane, and poor conductivity, the electrocatalytic hydrogen evolution properties of MoS 2 can be improved in three ways: activating the inert basal plane to improve intrinsic activity, increasing active edge sites, and improving the conductivity. Defects can adjust the surface electronic structure of the crystal to bring the hydrogen adsorption free energy closer to zero. Therefore, current research has mainly used S-vacancies to activate the inert basal surface of MoS 2 ; used edge defects to increase the number of active sites; and used defective conductive carbon supports to improve the conductivity of MoS 2-based catalysts. This review introduces researches on improving the performance of MoS 2 for HER by considering the purpose, characterization, and preparation of defects.

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“…As a result, great efforts have been made to elevate related HER activity. [ 10,12–14,16–17 ] Recently, regulating interlayer spacing has been reported being efficient to tune the HER activity of MoS 2 . [ 18–23 ] Zhou et al [ 19 ] utilizing an oxygen incorporation approach successfully synthesized one type of MoS 2 with an enlarged interlayer spacing of 8.4 Å which could provide higher surface area and expose more active sites to enhance HER activity.…”

Section: Introductionmentioning

confidence: 99%

H₂‐Directing Strategy on In Situ Synthesis of Co‐MoS₂ with Highly Expanded Interlayer for Elegant HER Activity and its Mechanism

Jin

Liu

Dai

et al. 2020

Advanced Energy Materials

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MoS2 has drawn great attention as a promising Pt‐substituting catalyst for the hydrogen evolution reaction (HER). This work utilizes H2 as the structure directing agent (SDA) to in situ synthesize a range of Co‐MoS2‐n (n = 0, 0.5, 1.0, 1.4, 2.0) with expanded interlayer spacings (d = 9.2 – 11.1 Å), which significantly boost their HER activities. The Co‐MoS2‐1.4 with an interlayer spacing of 10.3 Å presents an extremely low overpotential of 56 mV (at 10 mA cm−2) and a Tafel slope of 32 mV dec−1, which is superior than most reported MoS2‐based catalysts. Density function theory calculations are used to gain insights that i) the H2 can be dissociatively adsorbed on MoS2 and greatly affect the related surface free energy by regulating the interlayer spacing; ii) the expanded interlayer spacing can significantly decrease the absolute value of ΔGH, thereby leading to greatly promoted HER activity. Additionally, the large amounts of 1T phase (73.9–79.2%) and Co‐Mo‐S active sites (40.9–91.3%) also contribute to the enhanced HER activity of the synthesized samples. Overall, a simple new strategy for in situ synthesis of Co‐MoS2 with an expanded interlayer spacing is proposed, which sheds light on other 2D energy material designs.

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Role of Sulfur Vacancies and Undercoordinated Mo Regions in MoS₂ Nanosheets toward the Evolution of Hydrogen

Cited by 462 publications

References 81 publications

Scalable Synthesis of a MoS₂/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

Scalable Synthesis of a MoS₂/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

H₂‐Directing Strategy on In Situ Synthesis of Co‐MoS₂ with Highly Expanded Interlayer for Elegant HER Activity and its Mechanism

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Role of Sulfur Vacancies and Undercoordinated Mo Regions in MoS2 Nanosheets toward the Evolution of Hydrogen

Cited by 462 publications

References 81 publications

Scalable Synthesis of a MoS2/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

Scalable Synthesis of a MoS2/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS2‐based Materials

H2‐Directing Strategy on In Situ Synthesis of Co‐MoS2 with Highly Expanded Interlayer for Elegant HER Activity and its Mechanism

Contact Info

Product

Resources

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Role of Sulfur Vacancies and Undercoordinated Mo Regions in MoS₂ Nanosheets toward the Evolution of Hydrogen

Scalable Synthesis of a MoS₂/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

Scalable Synthesis of a MoS₂/Black Phosphorus Heterostructure for pH‐Universal Hydrogen Evolution Catalysis

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS₂‐based Materials

H₂‐Directing Strategy on In Situ Synthesis of Co‐MoS₂ with Highly Expanded Interlayer for Elegant HER Activity and its Mechanism