Defect-rich exfoliated MoSe2 nanosheets by supercritical fluid process as an attractive catalyst for hydrogen evolution in water

Truong, Quang Duc; Nakayasu, Yuta; Nguyen, Quyen T.; Nguyen, Duc Nghia; Nguyen, Chuc T.; Devaraju, Murukanahally Kempaiah; Rangappa, Dinesh; Nayuki, Keiichiro; Sasaki, Yukichi; Tran, Phong D.; Tomai, Takaaki; Honma, Itaru

doi:10.1016/j.apsusc.2019.144537

Cited by 24 publications

(13 citation statements)

References 36 publications

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“…In 2D molybdenum diselenide (MoSe 2 ), a van der Waals semiconductor with monolayer direct bandgap of 1.5 eV 1 , these inhomogeneities can range in size from as small as a selenium vacancy [2][3][4] to microscale in the case of grain boundaries and locally oxidized domains [5][6][7] . While many researchers are pushing the limits of crystal perfection, the inhomogeneities and defects have proven beneficial in the cases of quantum emission from atomic vacancies [8][9][10] , electronic transport modification at grain boundaries 11,12 , and improved catalysis in substoichiometric materials 13 . Often, these features are only observed via low-throughput techniques such as transmission electron microscopy or scanning tunneling microscopy [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Moore

Nguyen

et al. 2020

npj 2D Mater Appl

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Developing characterization strategies to better understand nanoscale features in two-dimensional nanomaterials is of crucial importance, as the properties of these materials are many times driven by nanoscale and microscale chemical and structural modifications within the material. For the case of large area monolayer MoSe2 flakes, kelvin probe force microscopy coupled with tip-enhanced photoluminescence was utilized to evaluate such features including internal grain boundaries, edge effects, bilayer contributions, and effects of oxidation/aging, many of which are invisible to topographical mapping. A reduction in surface potential due to n-type behavior was observed at the edge of the flakes as well as near grain boundaries. Potential phase mapping, which corresponds to the local dielectric constant, depicted local biexciton and trion states in optically-active regions of interest such as grain boundaries. Finally, nanoscale surface potential and photoluminescence mapping was performed at several stages of oxidation, revealing that various oxidative states can be evaluated during the aging process. Importantly, all of the characterization performed in this study was non-destructive and rapid, crucial for quality evaluation of an exciting class of two-dimensional nanomaterials.

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Section: Introductionmentioning

confidence: 99%

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Moore

Nguyen

et al. 2020

npj 2D Mater Appl

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“…These crystal defects are either the Mo vacancies or Se vacancies, and the lattice fringes are separated by these vacancy defects. Besides, the HRTEM images shown in Figure 2e and f are corresponding to the typical (100) and (001) planes of the hexagonal MoSe 2 , respectively [31–34] . Interestingly, it is worth mentioning that a large number of such vacancy defects and exposed edge surfaces can be readily found in the sample (Figure S4).…”

Section: Resultsmentioning

confidence: 89%

Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

et al. 2021

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Recently, Mg‐ion batteries (MIBs) and Mg−Li hybrid ion batteries (MLIBs) are deemed as potential energy‐storage devices. However, due to the insufficient storage sites of Mg2 + in the cathode, MIBs show a low reversible capacity. For MLIBs, the property is also seriously restricted due to the main Li+ intercalation reaction and less Mg2+ intercalation reaction. Herein, ultrathin MoSe2 nanosheets with enriched atomic defects and exposed edge surfaces are prepared by the hydrothermal method and subsequent hydrogen treatment. It is found that the Mg2+ storage performance is markedly enhanced, and Mg2+/Li+ co‐intercalation can be achieved. Density functional theory (DFT) calculation shows that, by introducing a large number of atomic defects and edge exposed surfaces in the ultrathin MoSe2 nanosheets, the Mg2+ storage sites are increased, and the diffusion and migration ability of Mg2+ and Li+ are improved, resulting in a significant property improvement. Further, the Mg2+ intercalation in MIBs and Mg2+/Li+ co‐intercalation in MLIBs are confirmed. The discharge‐charge mechanisms only based on the intercalation reactions for both MIBs and MLIBs are also revealed.

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“… 30 The defects, including chalcogen vacancy, metal vacancy, line, and antisite, etc., result in alteration of the electronic structure and modify the intrinsic characteristics of 2D MoSe 2 in favor of electrocatalytic H 2 generation. 6 , 20 , 21 For instance, vacancy creation induces the catalytic activity in the inert basal plane and edges of 2D MoSe 2 and enhances the electronic conductivity. 6 , 20 Gao et al 6 produced dual Mo and Se vacancies in 2H MoSe 2 through chemical vapor deposition.…”

Section: Modulating the Electrocatalytic And Physicochemical Properti...mentioning

confidence: 99%

Review on 2D Molybdenum Diselenide (MoSe₂) and Its Hybrids for Green Hydrogen (H₂) Generation Applications

et al. 2022

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Hydrogen (H 2 ) is a green and economical substitute to traditional fossil fuels due to zero carbon emissions. Water splitting technology is developing at a rapid speed to sustainably generate H 2 through electro- and photolysis of water without the harmful emissions associated with steam methane reforming. Development of efficient catalysts for the hydrogen evolution reaction (HER) is pertinent for economical green H 2 generation. In this regard, 2D transition metal dichalcogenides (TMDCs) are considered to be excellent alternatives to noble metal catalysts. Among other TMDCs, 2D MoSe 2 is preferred due to the low Gibbs free energy for hydrogen adsorption, good electrical conductivity, and more metallic nature. Moreover, the physicochemical and electronic properties of MoSe 2 can be easily tailored to suit HER application by simple synthetic strategies. Herein, we comprehensively review the application of 2D MoSe 2 in the electrocatalytic HER, focusing on recent advancements in the modulation of the MoSe 2 properties through nanostructure design, phase transformation, defect engineering, doping, and formation of heterostructures. We also discuss the role of 2D MoSe 2 as a cocatalyst in the photocatalytic HER. The article concludes with a synopsis of current progress and prospective future trends.

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Defect-rich exfoliated MoSe2 nanosheets by supercritical fluid process as an attractive catalyst for hydrogen evolution in water

Cited by 24 publications

References 36 publications

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

Review on 2D Molybdenum Diselenide (MoSe₂) and Its Hybrids for Green Hydrogen (H₂) Generation Applications

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Defect-rich exfoliated MoSe2 nanosheets by supercritical fluid process as an attractive catalyst for hydrogen evolution in water

Cited by 24 publications

References 36 publications

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Enhancing Mg2+ and Mg2+/Li+ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe2

Review on 2D Molybdenum Diselenide (MoSe2) and Its Hybrids for Green Hydrogen (H2) Generation Applications

Contact Info

Product

Resources

About

Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

Review on 2D Molybdenum Diselenide (MoSe₂) and Its Hybrids for Green Hydrogen (H₂) Generation Applications