XPS studies of the surface of nanocrystalline tungsten disulfide

Shpak, A. P.; Korduban, A. M.; Kulikov, L.M.; Kryshchuk, T.V.; König, Nico; Kandyba, Viktor

doi:10.1016/j.elspec.2010.05.030

Cited by 49 publications

(36 citation statements)

References 23 publications

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“…These methods include liquid exfoliation [8,9], hydrothermal synthesis [10,11], pyrolysis [12], chemical vapor deposition [13] and electrochemical Li-intercalation [14]. TMDCs have a wide variety of mechanical and electronic applications with semiconductors of MoS 2 [15,16], MoSe 2 [17,18], WS 2 [19,20] and WSe 2 [21,22]. In particular, the WS 2 material consists of 2D covalently bonded S-W-S layers separated by a van der Waals gap.…”

Section: Introductionmentioning

confidence: 99%

The use of tungsten disulfide dots as highly selective, fluorescent probes for analysis of nitrofurazone

Guo

Wang

et al. 2015

Talanta

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Section: Introductionmentioning

confidence: 99%

The use of tungsten disulfide dots as highly selective, fluorescent probes for analysis of nitrofurazone

Guo

Wang

et al. 2015

Talanta

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“…The major component at 33.2 eV is assigned to W IV in the WS 2 . [49][50][51][52] An additional weak doublet (7.5 %o ft otal W4fs ignal) was identified at 36.2 eV,w hich corresponds to W VI . [52] The appearance of W VI seems to be caused by partial oxidation of the NT-WS 2 surface by atmospheric oxygen.T he second component of this doublet is partially overlapped with the W5p 3/2 signal at ca.…”

Section: Resultsmentioning

confidence: 99%

“…As found, the W 4f spectra contain two components. The major component at 33.2 eV is assigned to W IV in the WS 2 . An additional weak doublet (7.5 % of total W 4f signal) was identified at 36.2 eV, which corresponds to W VI .…”

Section: Resultsmentioning

confidence: 99%

“…The X‐ray photoelectron spectrum of the pristine NT‐WS 2 contains two components (Figure a). The major component at 162.8 eV was assigned to S 2− in WS 2 . The second component at 169.3 eV (Figure a) indicates that the surface of pristine NT‐WS 2 contains a certain amount of SO 4 2− (about 17 at.%.…”

Section: Resultsmentioning

confidence: 99%

“…The major component at 162.8 eV was assigned to S 2À in WS 2 . [49,50] The second component at superficial sulfur). [53][54][55] Obviously,i ti sf ormed due to prolonged contact of commercialn anotubes with atmospheric oxygen.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS₂ Nanotubes

Polyakov

Козлов

Лебедев

et al. 2018

Chemistry A European J

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Composites of WS2 nanotubes (NT‐WS2) and gold nanoparticles (AuNPs) were prepared using aqueous HAuCl4 solutions and subjected to surface analysis. The obtained materials were jointly characterized by X‐ray photoelectron (XPS), Raman scattering (RSS), and ultraviolet photoelectron (UPS) spectroscopies. Optical extinction spectroscopy and electron energy loss spectroscopy in the scanning transmission electron microscopy regime (STEM‐EELS) were also employed to study plasmon features of the nanocomposite. It was found that AuNPs deposition is accompanied by a partial oxidative dissolution of WS2, whereas Au‐S interfacial species could be responsible for the tight contact of metal nanoparticles and the disulfide. A remarkable sensitivity of n‐type resistance of NT‐WS2 and Au‐NT‐WS2 to the adsorption of NO2 gas was also demonstrated at room temperature using periodical illumination by a 530 nm light‐emitting diode. Au‐NT‐WS2 nanocomposites are found to possess a higher photoresponse and enhanced sensitivity in the 0.25–2.0 ppm range of NO2 concentration, as compared to the pristine NT‐WS2. This behaviour is discussed within the physisorption‐charge transfer model to explore sensing properties of the nanocomposites.

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Electrochemically Decorated Iridium Electrodes with WS₃₋_x Toward Improved Oxygen Evolution Electrocatalyst Stability in Acidic Electrolytes

Escalera‐López

Jensen

Rees

et al. 2021

Advanced Sustainable Systems

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A simple method to do so is via water splitting, which can be driven by renewable energy sources (e.g., solar photovoltaics, wind, hydroelectric) coupled to an electrochemical device such as a water electrolyser. [6] Electrolysers are a well-established technology proven to be extremely robust in alkaline media, with reported lifetimes over 15 years and reasonable conversion efficiencies of >50%. [7,8] Proton exchange membrane electrolysers, which operate in acidic media, on the other hand, have the potential of producing higher purity pressurized hydrogen at increased power densities than in alkaline conditions. [6,9,10] However, its commercial viability is hampered by the catalyst materials employed for the kinetically hindered 4-electron oxygen evolution reaction (OER) taking place at the electrolyser anode. [11][12][13] In particular, the harsh electrochemical environments under which OER electrocatalysts operate severely narrows down the potential candidates to scarce Ir-based electrocatalysts. [14,15] These metals, and to a lesser extent their rutile-type oxide analogues, still undergo electrochemical dissolution during OER operation. [16][17][18] This dissolution is crucial for describing performance losses in PEM water electrolysers. [19,20] It has recently been shown that OER stability is not only highly dependent on their native structure and chemical environment, [21,22] but also on the degree of nanostructuring and surface defects. [23][24][25] Consequently, research into improving Ir catalyst utilization is extensive. Such improvement can be attempted through many different approaches; either by surface area maximization (e.g., nanoframes, [26,27] nanowires, [28] nanodendrites, [29] and self-supported nanostructured networks [30] ), by reducing loadings by use of mixed metal oxides, [31][32][33][34] or by anchoring to corrosion-resistant supports such as ATO [35][36][37][38] or TiO 2 [39,40] to yield stabilizing support interactions. Iridium anchoring to tin-based electrocatalyst supports such as ATO or ITO, however, has been shown to be somewhat compromised by the inherent tin instability within the supports. [41] Simultaneously, the quest of finding alternative acid-stable OER electrocatalyst is ongoing and has recently been assessed by both high-throughput computational methods [42,43] or using various transition metal or complex non-noble metal compounds such as pyrochlores [44] or polyoxometalates. [45] Iridium-based oxides, currently the state-of-the-art oxygen evolution reaction (OER) electrocatalysts in acidic electrolytes, are cost-intensive materials which undergo significant corrosion under long-term OER operation. Thus, numerous researchers have devoted their efforts to mitigate iridium corrosion by decoration with corrosion-resistant metal oxides and/or supports to maximize OER catalyst durability whilst retaining high activity. Herein a one-step, facile electrochemical route to obtain improved IrO x thin film OER stability in acid by decorating with amorphous tungsten sulphide (WS 3−x ...

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XPS studies of the surface of nanocrystalline tungsten disulfide

Cited by 49 publications

References 23 publications

The use of tungsten disulfide dots as highly selective, fluorescent probes for analysis of nitrofurazone

The use of tungsten disulfide dots as highly selective, fluorescent probes for analysis of nitrofurazone

Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS₂ Nanotubes

Electrochemically Decorated Iridium Electrodes with WS₃₋_x Toward Improved Oxygen Evolution Electrocatalyst Stability in Acidic Electrolytes

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XPS studies of the surface of nanocrystalline tungsten disulfide

Cited by 49 publications

References 23 publications

The use of tungsten disulfide dots as highly selective, fluorescent probes for analysis of nitrofurazone

The use of tungsten disulfide dots as highly selective, fluorescent probes for analysis of nitrofurazone

Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS2 Nanotubes

Electrochemically Decorated Iridium Electrodes with WS3−x Toward Improved Oxygen Evolution Electrocatalyst Stability in Acidic Electrolytes

Contact Info

Product

Resources

About

Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS₂ Nanotubes

Electrochemically Decorated Iridium Electrodes with WS₃₋_x Toward Improved Oxygen Evolution Electrocatalyst Stability in Acidic Electrolytes