One-step hydrothermal synthesis and electrocatalytic properties of MoS2/activated carbon composite derived from shallots

Kanjana, Nattakan; Maiaugree, Wasan; Lunnoo, Thodsaphon; Laokul, Paveena; Chaiya, Inthira; Ruammaitree, Akkawat; Wongjom, Poramed; Infahsaeng, Yingyot

doi:10.1007/s10800-023-01921-z

Cited by 14 publications

(4 citation statements)

References 39 publications

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“…Two-dimensional (2D) Transition Metal dichalcogenides (MoS 2 , WSe 2 , WS 2 , MoSe 2 , MoTe 2 ) have received great attention due to its unique optical, electrical, and mechanical properties [2][3][4]. Among them, Molybdenum disul de (MoS 2 ) nanosheets are the most promising candidates because of their potential applications in optoelectronic devices, catalysis, highly effective sensors, batteries, supercapacitors, water desalination, energy storage and many other elds [5][6][7][8][9]. MoS 2 nanosheet has garnered signi cant attention owing to its unique properties including mechanical exibility, and a large surface area, number of layers dependent tunable band gap, etc.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles Decorated Wide Band Gap MoS2 Nanosheet: Enhanced Optical and Electrical Properties

Gogoi,

Deb

2024

Plasmonics

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Metal nanoparticles decorated Molybdenum disulphide (MoS 2 ) nanosheets have received great attention of researchers due to their potential applications in biosensing, optoelectronics, photocatalysis, SERS, etc.Here, we report the enhanced optical and electrical properties of wide band gap MoS 2 nanosheets when decorated with silver nanoparticles (Ag-MoS 2 nanosheets). Field Emission Scanning Electron Spectroscopy (FESEM) images reveal the formation of well-shaped MoS 2 nanosheet-like structures decorated with silver nanowires. MoS 2 nanosheets are 27.9 µm long and 12.9 µm wide and the thickness is in the range of nanometer. X-ray diffraction (XRD) spectra show peaks at 25.46°, 33.79°, 36.28°, and 50.97° corresponding to ( 111), ( 100), (102), and (105) crystalline planes for pure MoS 2 and at 47.26° and 78.28° corresponding to the ( 200) and ( 311) crystalline planes for silver in Ag-MoS 2 nanosheets respectively. The UV-Vis absorption peak is observed at 340 nm for MoS 2 but gets blue-shifted for Ag-MoS 2 nanosheets. The calculated band gap is found to be 3.05eV for MoS 2 nanosheet, so it falls under the category of wide band gap (2-4 eV) semiconductors which can have potential application in UV photodetection. From the photoluminescence spectra, we have observed enhanced emission for Ag-MoS 2 in the range of 410-470 nm for the excitation wavelength 280 nm. Raman peak intensity of MoS 2 nanosheet has increased signi cantly when decorated with Ag nanostructure which can have potential SERS application. I-V characteristic of Ag-MoS 2 nanosheets under illumination exhibits negative photoconductivity but is positive for pristine MoS 2 nanosheets.

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Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles Decorated Wide Band Gap MoS2 Nanosheet: Enhanced Optical and Electrical Properties

Gogoi,

Deb

2024

Plasmonics

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“…Since the charge and mass transfer resistance of Zn anode is smaller than the cathode, anode impedance is ignored in the EIS analysis. [17] As shown in Figure 2a, the resistance in EIS measurement consists of three parts: the resistance corresponding to the intersection of the EIS curve and the real axis is the ohmic resistance (R e ), [19] the radius of the smaller arc in the high-frequency region is the cathode charge transfer resistance (R cct ) and the radius of the larger arc in the low-frequency region is the cathode mass transfer resistance (R cmt ). Figure S1-S5 show the EIS spectrum of RZABs at different cycles under open circuit voltage (OCV), 1.2 V, 1.0 V and 0.8 V. In addition, the EIS spectra shown in Figure 2b exhibits the approximate curve combined with large and small arcs from high-frequent to low-frequent at different cycle times under a voltage of 0.8 V. The radii of the two arcs exhibit abnormal fluctuations with R cct and R cmt showing a downward trend in contrast to R e .…”

Section: Attenuation Phenomenon Of Rzabsmentioning

confidence: 99%

Intermittent investigations on attenuation mechanism of rechargeable zinc‐air batteries during charge/discharge cycles

Peng,

Chen,

Zhang

et al. 2024

ChemPhysChem

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Rechargeable zinc‐air batteries (RZABs) are an ideal substitute for energy storage, but the short cycle longevity during long‐term charge/discharge operation is one of the bottleneck factors that seriously restrict commercial application. Herein, the FeCo alloy/N, S co‐doped carbon aerogel (NSCA/FeCo) were prepared as catalysts of cathode for RZABs. We investigated the polarization and impedance on long‐term cycles during the battery operation to explore the attenuation mechanism. The results indicated that the roundtrip efficiency of batteries during charge/discharge cycles reduced fast initially and then slow. Besides, the comparative experiment was tested through the replacement of a new electrolyte and a zinc sheet. It is manifested that the failure of the battery is mainly due to the attenuation of the air cathode performance. Therefore, to further disclose the influencing factors and internal mechanisms of air cathode performance degradation, we conducted a series of characterization and testing, including the hydrophilicity, surface morphology, elemental composition, and electrochemical performance of three‐electrode systems at different cycle times. This work not only provides a theoretical basis for deeply comprehending the attenuation mechanism of the cathode but also serves a reference for the material design and operating condition optimization of RZABs.

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“…The Nyquist plots along with the curve fitting model deduce from the impedance measurement of various counter electrodes used in the devices shown in figure 8(a) in the form of semicircles. The fitted model predicted (figure 8(b)) the different circuit elements within the device including R CE1 which is interfacial charge transfer resistance between counter electrode and electrolyte while R CT1 represents the interfacial resistance between working electrode and electrolyte, which are represented by the high and small frequency region in first and second semicircles, respectively [49,50]. Series resistance R S1 is the intercept value along real axis (Z´) with higher frequency region of semicircle (first) associated with the resistance of Ti wire/electrolyte and counter electrode while diameters of these semicircles depict the interfacial charge transfer resistance (R CE1 ) between the bare/modified CNTF or Pt wire as counter electrode and the electrolyte, and RCT capacitive behavior of device including photoanode (Ti/TiO 2 /dye).…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Electrodeposited polyaniline based carbon nanotubes fiber as efficient counter electrode in wire-shaped dye sensitized solar cells

Hendi,

Awad,

Ortashi

2023

Nanotechnology

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Electrodeposited polyaniline over the carbon nanotubes-based fiber (CNTF) has been investigated as potential candidate to substitutes the Pt based auxiliary electrodes in unidimensional fibrous solar cells. CNTF, with excellent electrical and mechanical properties, modified with conducting polymer (polyaniline) via facile electrodeposition process which employed as cathodic materials showed efficientelectrochemical reduction of triiodide ions in the fiber shaped dye-sensitized solar cells (FDSSC). Scanning electron microscopic (SEM) analysis showed the efficacious integration of conducting polymer over the CNTF surface. The admirable electrocatalytic behavior of the fabricated electrode has investigated by electrochemical impedance spectroscopy and cyclic voltammetry. Current density and voltage (J-V) curves are used to quantify the photovoltaic performance of devices with different counter electrodes with fixed photoanode. With lower peak to peak separation, improved current density and better fill factor, exhibited the superior efficiency of modified electrode (PANI@CNTF). As compared to pristine fiber, polyaniline modification showed the outstanding performance with improved photovoltaics and electrochemical parameters measured by the J-V and CV curves, respectively.

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One-step hydrothermal synthesis and electrocatalytic properties of MoS2/activated carbon composite derived from shallots

Cited by 14 publications

References 39 publications

Silver Nanoparticles Decorated Wide Band Gap MoS2 Nanosheet: Enhanced Optical and Electrical Properties

Silver Nanoparticles Decorated Wide Band Gap MoS2 Nanosheet: Enhanced Optical and Electrical Properties

Intermittent investigations on attenuation mechanism of rechargeable zinc‐air batteries during charge/discharge cycles

Electrodeposited polyaniline based carbon nanotubes fiber as efficient counter electrode in wire-shaped dye sensitized solar cells

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