Hydrothermal Synthesis and Electrochemical Properties of MoS2/C Nanocomposite

Song, Haishen

doi:10.20964/2018.07.54

Cited by 33 publications

(12 citation statements)

References 30 publications

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“…In this case, the copper plates of the sensor correspond to passive, steelactive sections on the surface of the steel reinforcement, and the magnitude of the current between the artificial cathode and anode can be considered as a measure of the corrosion rate of the reinforcement. It should be noted that in the absence of chloride ions in the model solution and the magnitude of the free corrosion potential of steel corresponding to the passive state, the value of i sensor is significantly higher than the values of 0.1-0.2 μA·cm -2 given in the literature [11]. This may be due to both significant polarization of the steel with electrical contact with copper, the difference in potentials of free corrosion of these metals under experimental conditions is of the order of 200 mV.…”

Section: Introductionmentioning

confidence: 58%

“…To quickly assess the effectiveness of migrating inhibitors and hydrophobizers, electrochemical methods are used, most often the polarization resistance method [7,8]. Electrochemical measurements are performed either in model electrolytes simulating a pore liquid, or on electrodes embedded in concrete [7][8][9][10][11][12]. The ability of various substances to migrate through the protective layer of concrete to the reinforcement, which is a prerequisite for the manifestation of their protective action, is studied using membranes made of concrete and precision analytical methods.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the effectiveness of migrating corrosion inhibitors and hydrophobizers for protection against corrosion of steel reinforcement in concrete using bimetallic batch sensor

2018

Int. J. Corros. Scale Inhib.

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A method is proposed for quantitative evaluation of the effectiveness of the protective action of hydrophobizers and inhibitors in relation to the corrosion process of reinforcement in reinforced concrete. Surface treatment of reinforced concrete structures with hydrophobizers leads to a significant increase in the specific electrical resistance of the protective layer of concrete. This makes it difficult to use electrochemical methods to determine the rate of corrosion of reinforcement, in particular, the method of polarization resistance. In this work, as a sensor for determining the rate of corrosion under a layer of concrete, it is proposed to use a bimetallic batch sensora package of galvanic cells (copper/low-carbon steel) capable of generating an electric current upon contact with the electrolyte. In this case, the copper plates of the sensor correspond to passive, steelactive sections on the surface of the steel reinforcement, and the magnitude of the current between the artificial cathode and anode can be considered as a measure of the corrosion rate of the reinforcement. The distance between the sensor plates is comparable to the distance between individual pits. Therefore, using the above described method, the corrosion process is modeled on the "active" sections of steel reinforcement, areas of microcell-pit/passive steel surfaces. The effectiveness of this method is demonstrated by the example of a commercial hydrophobizer based on alkoxysilanes, which also possesses inhibitory properties. Surface treatment of concrete samples contaminated with chlorides (1.00 and 3.25 mass% relative to the dry cement mass), a hydrophobizer, leads to a sharp decrease (up to 90%) of the galvanic current at the sensor. The protective effect persists for twenty cycles of wetting / drying (10 months) and when the water in the humidification cycle is replaced with a 3% solution of sodium chloride (six cycles of wetting / drying). When processing a concrete sample with a hydrophobizer, a sharp increase in the specific electrical resistance of concrete (up to 20 times on samples contaminated with chlorides) is observed and the potential for free corrosion of steel plates shifts to positive values. At the same time, the values of the potential of free corrosion and concrete resistivity of concrete, for the passive and active states determined by the sensor, meet the criteria given in RILEMTC 154-EMC. It is shown in the model calculations that an increase in the specific

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Section: Introductionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Evaluation of the effectiveness of migrating corrosion inhibitors and hydrophobizers for protection against corrosion of steel reinforcement in concrete using bimetallic batch sensor

2018

Int. J. Corros. Scale Inhib.

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“…The MoS 2 was produced by hydrothermal synthesis, based on various reports found in the literature 39,40 . First, we added 2.66 g of thiourea and 2.117 g of sodium molybdate dihydrate in 50 mL of ultrapure (mili‐Q) water.…”

Section: Methodsmentioning

confidence: 99%

“…The MoS 2 was produced by hydrothermal synthesis, based on various reports found in the literature. 39,40 First, we added 2.66 g of thiourea and 2.117 g of sodium molybdate dihydrate in 50 mL of ultrapure (mili-Q) water. This mixture was taken to a heated magnetic stirrer (70 C) for 20 minutes, and then ultrasonicated for 30 minutes.…”

Section: Hydrothermal Synthesis Of Mosmentioning

confidence: 99%

High‐performance symmetric supercapacitor based on molybdenum disulfide/poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) composite electrodes deposited by spray‐coating

2021

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Here we present the study of supercapacitors based on molybdenum disulfide and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (MoS 2 /PEDOT: PSS) composite electrodes deposited by spray-coating. To produce the MoS 2 / PEDOT:PSS composite ink, dispersions of hydrothermally synthesized MoS 2 and PEDOT:PSS were mixed in different weight proportions. Electrodes containing only PEDOT:PSS and MoS 2 were also fabricated for comparison. The composite films were deposited by transferring the as-prepared inks to an airbrush coupled to a modified 3D printer base with in-line displacement. The films were characterized in terms of the scanning electron microscope (SEM), Raman spectroscopy, and sheet resistance. The electrochemical properties of supercapacitors were evaluated by cyclic voltammetry (CV), galvanostatic charge/discharges (GCD) techniques, impedance spectroscopy (IS), and their correlated parameters. The maximum specific capacitance of the MoS 2 -basedsupercapacitor was estimated to be 145.9 F g −1 at 1 mV s −1 , while the 3:1 MoS 2 /PEDOT:PSS weight ratio supercapacitor exhibited a specific capacitance of 131.1 F g −1 . Despite the slightly lower C SP , the 3:1 device provided a better overall performance, with a remarkably higher energy density of 11.2 Wh kg −1 and a maximum power density of 1020 W kg −1 . It also displayed better longterm cycle stability, retaining 92% of its initial capacitance after 1000 CV cycles (against 54% of MoS 2 devices). In summary, we demonstrated the study and production of a high-performance supercapacitor with spray-deposited MoS 2 / PEDOT:PSS composite electrodes, in which the production can be easily scalable for mass production and practical applications.

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“…The hydrothermal synthesis has been extensively explored and can be used to prepare aqueous solution-based TMDs that can overcome interference from air moisture in the final products. The technique also produces suitable electrochemical and photocatalytic materials that accelerate electron and ion transport more simply (Song et al, 2018;Z. Wang et al, 2019) (Table 1).…”

Section: Fabrication Strategies Of Tmdsmentioning

confidence: 99%

Environmental Decontamination Using Transition Metal Dichalcogenides Based Materials: A Review

Ejeromedoghene¹,

Nnyia²,

Okoye³

et al. 2022

JMESR

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The frequent release of toxic compounds into the environment has caused substantial pollution of different aspects of the ecosystem. Thus, the need for suitable materials for environmental remediation is in high demand. Although many 2D materials with remarkable properties have been synthesized for the remediation of toxic pollutants of organic and inorganic origin, transition metal dichalcogenides (TMDs) have gathered extensive recognition lately, owing to their intriguing photocatalytic properties and tunable functionality that offers promising prospects for the decontamination, degradation, adsorption, and removal of these toxic pollutants. Therefore, this review provides the recent advancement of photocatalytic TMDs and the mechanism of their performance towards environmental remediation. Also, insights on new perspectives were highlighted.

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Hydrothermal Synthesis and Electrochemical Properties of MoS2/C Nanocomposite

Cited by 33 publications

References 30 publications

Evaluation of the effectiveness of migrating corrosion inhibitors and hydrophobizers for protection against corrosion of steel reinforcement in concrete using bimetallic batch sensor

Evaluation of the effectiveness of migrating corrosion inhibitors and hydrophobizers for protection against corrosion of steel reinforcement in concrete using bimetallic batch sensor

High‐performance symmetric supercapacitor based on molybdenum disulfide/poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) composite electrodes deposited by spray‐coating

Environmental Decontamination Using Transition Metal Dichalcogenides Based Materials: A Review

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