Abstract:Herein, we report the synthesis of tungsten based nanostructures such as WO3, WO3-X (W02.72:WS2), and WS2 through a facile single step hydrothermal technique. The optical, structural, and morphological studies are...
“…It is noted that the 2H/1T-WS 2 -10 electrode has higher specific capacitance (664 F g −1 ) and energy density (92 W h kg −1 ) than 2H-WS 2 (269 F g −1 and 37 W h kg −1 ), 2H-WS 2 -2 (460 F g −1 and 64 W h kg −1 ) and 2H-WS 2 -6 (462 F g −1 and 66 W h kg −1 ) electrodes. The supercapacitor performance of the 2H@1T multiphase Ru doped WS 2 electrode is close to the literature report of 2D TMD based symmetric or asymmetric supercapacitor cells 36–52 (Table 1).…”
Section: Resultssupporting
confidence: 87%
“…4a) and and 66 W h kg −1 ) electrodes. The supercapacitor performance of the 2H@1T multiphase Ru doped WS 2 electrode is close to the literature report of 2D TMD based symmetric or asymmetric supercapacitor cells [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] (Table 1).…”
The metallic and semiconductive phase (1T/2H) coupling enhanced electrochemical energy generation and storage performance of the Ru-doped WS2 multifunctional electrode is reported here.
“…It is noted that the 2H/1T-WS 2 -10 electrode has higher specific capacitance (664 F g −1 ) and energy density (92 W h kg −1 ) than 2H-WS 2 (269 F g −1 and 37 W h kg −1 ), 2H-WS 2 -2 (460 F g −1 and 64 W h kg −1 ) and 2H-WS 2 -6 (462 F g −1 and 66 W h kg −1 ) electrodes. The supercapacitor performance of the 2H@1T multiphase Ru doped WS 2 electrode is close to the literature report of 2D TMD based symmetric or asymmetric supercapacitor cells 36–52 (Table 1).…”
Section: Resultssupporting
confidence: 87%
“…4a) and and 66 W h kg −1 ) electrodes. The supercapacitor performance of the 2H@1T multiphase Ru doped WS 2 electrode is close to the literature report of 2D TMD based symmetric or asymmetric supercapacitor cells [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] (Table 1).…”
The metallic and semiconductive phase (1T/2H) coupling enhanced electrochemical energy generation and storage performance of the Ru-doped WS2 multifunctional electrode is reported here.
“…The presence of WO 3 microcrystals was evidenced by the W 4f (Figure 6). W 5+ (35.0 and 33.6 eV-4.5 at.%) and W 6+ (34.8 and 37.0 eV-95.5 at.%) oxidation states were identified for WO 3 as being the representative species, while Ti 3p was considered as well during deconvolution [47][48][49]. The W 4d signal can reinforce the observations mentioned above [50,51].…”
Developing highly efficient Au/TiO2/WO3 heterostructures with applications in heterogeneous photocatalysis (photocatalytic degradation) and surface-enhanced Raman spectroscopy (dye detection) is currently of paramount significance. Au/TiO2/WO3 heterostructures were obtained via heat or time-assisted synthesis routes developed by slightly modifying the Turkevich–Frens synthesis methods and were investigated by TEM, SEM, XRD, Raman spectroscopy, XPS, photoluminescence, and UV–vis DRS techniques. Structural features, such as WO3 crystalline phases, TiO2 surface defects, as well as the WO3 (220) to TiO2-A (101) ratio, were the key parameters needed to obtain heterostructures with enhanced photocatalytic activity for removing oxalic acid, phenol, methyl orange, and aspirin. Photodegradation efficiencies of 95.9 and 96.9% for oxalic acid; above 96% (except one composite) for phenol; 90.1 and 97.9% for methyl orange; and 81.6 and 82.1% for aspirin were obtained. By employing the SERS technique, the detection limit of crystal violet dye, depending on the heterostructure, was found to be between 10−7–10−8 M. The most promising composite was Au/TiO2/WO3-HW-TA it yielded conversion rates of 82.1, 95.9 and 96.8% for aspirin, oxalic acid, and phenol, respectively, and its detection limit for crystal violet was 10−8 M. Au/TiO2/WO3-NWH-HA achieved 90.1, 96.6 and 99.0% degradation efficiency for methyl orange, oxalic acid, and phenol, respectively, whereas its limit of detection was 10−7 M. The Au/TiO2/WO3 heterojunctions exhibited excellent stability as SERS substrates, yielding strong-intensity Raman signals of the pollutant molecules even after a long period of time.
“…Moreover, the quasi-rectangular shape of the CV curve suggests pseudocapacitance. Equation ( 4 ) represents the electrochemical charge storage mechanism of WO 3 in the KOH electrolyte 47 : Figure 6 Cyclic voltammetry (CV) curves of ( A ) WO 3 and ( B ) WO 3 /C nanocomposite at different scan rates. Figure 7 Comparative CV curves at 20 mV/s scan rate of WO 3 /C, WO 3 , C, and background signal from the Cu substrate.…”
Section: Resultsmentioning
confidence: 99%
“…The observed increase in capacitance at lower scan rates aligns with the typical rate performance in energy storage devices. Lower scan rates allow better diffusion of electrolyte ions to reach the cavities within the electrode material's internal structure while at higher scan rates, ions may get only surface immersion 47 , 48 . Overall, the higher capacitance of the WO 3 /C nanocomposite affirmed that it has more pathways for charge diffusion within its structure.…”
A hierarchical nanocomposite of carbon microspheres decorated with tungsten oxide (WO3) nanocrystals resulted from the hydrothermal treatment of a precursor solution containing glucose and tungstic acid. The dehydration of glucose molecules formed oligosaccharides, which consequently carbonized, turning into carbon microspheres. The carbon microspheres then acted as a spherical nucleus onto which WO3 nanocrystals grew via heterogeneous nucleation. The reaction product showed a phase junction of orthorhombic and monoclinic WO3, which transitioned to mix-phase of tetragonal and monoclinic WO3 after a subsequent heat treatment at 600 °C in an inert condition. The electrochemical tests showed that incorporating WO3 onto the carbon (WO3/C) resulted in a three-fold increase in the specific capacitance compared to WO3 alone and a high coulombic and energy efficiencies of 98.2% and 92.8%, respectively. The nanocomposite exhibited supercapacitance with both Faradaic and non-Faradaic charge storage mechanisms. Electrochemical impedance spectroscopy showed a lower charge transfer resistance for the composite at Rct = 11.7Ω.
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