Two‐Dimensional Hybrid Nanosheets of Tungsten Disulfide and Reduced Graphene Oxide as Catalysts for Enhanced Hydrogen Evolution

Yang, Jieun; Voiry, Damien; Ahn, Seong Joon; Kang, Dongwoo; Kim, Ah Young; Chhowalla, Manish; Shin, Hyeon Suk

doi:10.1002/anie.201307475

Cited by 487 publications

(359 citation statements)

References 30 publications

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“…However, the above overpotential for HER in Figure 6 a is larger than that exhibited by the Ptfree electrodes such as MoS 2 and WS 2 -RGo composite electrodes, which have demonstrated an excellent HER activity in acidic medium. [62][63][64][65] Hence, we further investigated the catalytic activity of the NiS-Ti electrode towards HER in 0.5 M H 2 SO 4 solution, which demonstrated the evolution of hydrogen at a small overpotential of 0.12 V ( Figure 7 a). This activity is comparatively better than that demonstrated previously by the MoS 2 and WS 2 -RGo composite electrodes.…”

Section: Resultsmentioning

confidence: 99%

Revisiting Metal Sulfide Semiconductors: A Solution‐Based General Protocol for Thin Film Formation, Hall Effect Measurement, and Application Prospects

Shinde

Patil

Cho

et al. 2015

Adv Funct Materials

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5739wileyonlinelibrary.com deposition method, which is facile, benign, and which can deposit a uniform MS thin fi lms is highly desirable. Although various available techniques such as chemical vapor deposition, [ 9,10 ] atomic layer deposition, [ 11,12 ] molecular beam epitaxy, [ 13,14 ] electrodeposition, [ 7,15 ] successive ionic layer adsorption and reaction, [ 16,17 ] vapor sublimation, [ 18 ] etc., are able to produce thin fi lms of MS, they lack generality or need sophisticated instrumentation, and are complicated. In this context, chemical bath deposition is inarguably the simplest method for thin fi lm deposition. Generally, a suitable complexing agent and pH regulating agents are added in order to avoid spontaneous precipitation in an aqueous bath, which makes the process complicated due to extremely critical optimization for concentration of complexing agents and pH adjustment for an individual MS case. [ 4,[19][20][21][22] As a result, development of MS fi lms by solution-based method has often been a case of trial-and-error with poor reproducibility, which remained as an unexplored research fi eld yet in material science and technology. In order to tackle the above problems in aqueous solution, the fi lm deposition reaction is carried out in ethanol solution without the use of any complexing and/or pH-regulating agents. This protocol relies on dissolution of metal salts and thioacetamide in ethanol and heating the solutions at 70 °C. Although very few reports on MS fi lm deposition from nonaqueous solution has been reported, [ 23,24 ] no general protocol is available that can be applied overall to deposit all variety of MS thin fi lms under similar conditions with good reproducibility. The proposed protocol is extremely simple and general, which can lay simple guidelines to fabricate almost all types of metal sulfi des uniformly over all area of the substrate, provided that the corresponding metal salts are soluble in ethanol. The as-deposited MS fi lms are highly crystalline even without thermal treatment. Interestingly, the fi lms can be directly grown on variety of conducting as well as non-conducting substrates such as glass, plastic, fl uorine doped tin oxide (FTO), Ti-foil, carbon paper, Whatman fi lter paper, etc., which can be of great technological importance. As an example of potential application of these thin fi lms, we demonstrate the use of NiS fi lm deposited on fl exible plastic substrates as FTO-free dual-functioned (electronic support + electrocatalytic) counter electrode in dye-sensitized solar cells Revisiting Metal Sulfi de

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Section: Resultsmentioning

confidence: 99%

Revisiting Metal Sulfide Semiconductors: A Solution‐Based General Protocol for Thin Film Formation, Hall Effect Measurement, and Application Prospects

Shinde

Patil

Cho

et al. 2015

Adv Funct Materials

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“…A common strategy to improve the conductivity of MX 2 electrolysts is modification with conductive carbon or metal. [137,146,147] Recent studies on integration of carbon materials such as carbon nanotubes, [148,149] carbon boxes [150] and reduced graphene oxide [43] with interlayerexpanded MoS 2 for improving HER performance are extensively investigated. For instance, Lan and co-workers employed a one-step hydrothermal method to synthesize MoS 2 /N-doped rGO nanocomposite with interlayer spacing of 0.95 nm as HER electrocatalyst.…”

Section: Applications As Electrocatalysts For Hydrogen Evolution Reacmentioning

confidence: 99%

Interlayer Nanoarchitectonics of Two‐Dimensional Transition‐Metal Dichalcogenides Nanosheets for Energy Storage and Conversion Applications

Zhang

et al. 2017

Advanced Energy Materials

321

253

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Lamellar transition‐metal dichalcogenides (MX2) have promising applications in electrochemical energy storage and conversion devices due to their two‐dimensional structure, ultrathin thickness, large interlayer distance, tunable bandgap, and transformable phase nature. Interlayer engineering of MX2 nanosheets with large specific surface area can modulate their electronic structures and interlayer distance as well as the intercalated foreign species, which is important for optimizing their performance in different devices. In this review, a summary on recent progress of MX2 nanosheets and the significance of their interlayer engineering is presented firstly. Synthesis of interlayer‐expanded MX2 nanosheets with various strategies is then discussed in detail. Emphasis is focused on their applications in rechargeable batteries, pseudocapacitors, hydrogen evolution reaction (HER) catalysis and treatments of environmental contaminants, demonstrating the importance of interlayer engineering on controlling performance of MX2. The current challenges of the interlayer‐expanded MX2 and outlooks for further advances are finally discussed.

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“…Since the discovery of graphene, 2D materials, such as tungsten disulfide (WS 2 ) and other transition metal dichalcogenides (TMDCs), have drawn a great deal of interest due to their attractive physical and electronic properties [1][2][3]. It is reported that the hydrogen binding energy of MoS 2 is close to that of Pt-group metals, thus hinting at potential applications of other TMDCs in photocatalytic HER [4][5][6][7][8][9]. Both computational and experimental results have confirmed that the photocatalytic activities of XS 2 (X could be other transition metals, such as W) mainly stem from the edges rather than the basal planes [10,11].…”

Section: Introductionmentioning

confidence: 99%

Facile Sonication Synthesis of WS2 Quantum Dots for Photoelectrochemical Performance

Zhou

Yan

et al. 2017

Catalysts

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Two-dimensional transition metal dichalcogenides, such as tungsten disulfide (WS 2 ), have been actively studied as suitable candidates for photocatalysts due to their unique structural and electronic properties. The presence of active sites at the edges and the higher specific surface area of these materials are crucial to the photocatalytic activity of the hydrogen evolution reaction. Here, WS 2 quantum dots (QDs) have been successfully synthesized by using a combination of grinding and sonication techniques. The morphology of the QDs was observed, using transmission electron microscopy and an atomic force microscope, to have uniform sizes of less than 5 nm. Photoelectrochemical (PEC) measurements show that the current density of WS 2 QDs under illumination is almost two times higher than that of pristine WS 2 . Furthermore, these high-quality WS 2 QDs may have various applications in optoelectronics, solar cells, and biomedicine.

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Two‐Dimensional Hybrid Nanosheets of Tungsten Disulfide and Reduced Graphene Oxide as Catalysts for Enhanced Hydrogen Evolution

Cited by 487 publications

References 30 publications

Revisiting Metal Sulfide Semiconductors: A Solution‐Based General Protocol for Thin Film Formation, Hall Effect Measurement, and Application Prospects

Revisiting Metal Sulfide Semiconductors: A Solution‐Based General Protocol for Thin Film Formation, Hall Effect Measurement, and Application Prospects

Interlayer Nanoarchitectonics of Two‐Dimensional Transition‐Metal Dichalcogenides Nanosheets for Energy Storage and Conversion Applications

Facile Sonication Synthesis of WS2 Quantum Dots for Photoelectrochemical Performance

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