Facile fabrication of conductive MoS<sub>2</sub> thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction

Saha, Dipankar; Patel, Vinay; Selvaganapathy, P. Ravi; Kruse, Peter

doi:10.1039/d1na00456e

Cited by 15 publications

(16 citation statements)

References 48 publications

(73 reference statements)

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“…However, this is not what we observed for c-MoS 2 , because it showed a lower COF compared to other MoS 2 materials. In our case, conductive MoS 2 is in the +4 oxidation state in the bulk, whereas at the edges, MoS 2 first formed +6 oxidation states followed by reduction of the +5 oxidation state upon exposure of hydrogen peroxide . Hence, the edge reduction by hydrogen peroxide in conductive MoS 2 may contribute to lowering the COF of c-MoS 2 .…”

Section: Results and Discussionmentioning

confidence: 65%

“…In our case, conductive MoS 2 is in the +4 oxidation state in the bulk, whereas at the edges, MoS 2 first formed +6 oxidation states followed by reduction of the +5 oxidation state upon exposure of hydrogen peroxide. 8 Hence, the edge reduction by hydrogen peroxide in conductive MoS 2 may contribute to lowering the COF of c-MoS 2 . 24 XRD data of all pristine samples show a broad (002) peak at 2θ of ∼14°, but no new peaks were detected, 7 confirming that all samples are in the 2H phase without changes in the interlayer spacings or layer interactions within the individual flakes.…”

Section: Resultsmentioning

confidence: 99%

“…It has a band gap of 1.8 eV as a monolayer and 1.23 eV in bulk . The metallic 1T phase can be obtained through various methods, like lithium intercalation or hydrothermal processes. , Recently, we reported a safe and facile way of preparing conductive MoS 2 using dilute hydrogen peroxide. , There has been interest in MoS 2 for many practical applications, such as water quality sensors, , lubricants, field effect transistors, gas sensors, , batteries, supercapacitors, solar cells, and electrocatalysts . Some applications require a conductive form of MoS 2 (e.g., the metallic 1T phase, conductive composite materials, or doped conductive 2H-MoS 2 ), so that a small applied voltage can achieve a reasonably high current density .…”

Section: Introductionmentioning

confidence: 99%

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Tuning the Chemical and Mechanical Properties of Conductive MoS₂ Thin Films by Surface Modification with Aryl Diazonium Salts

et al. 2022

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Molybdenum disulfide (MoS2) is a promising material for applications in sensors, energy storage, energy conversion devices, solar cells, and fuel cells. Because many of those applications require conductive materials, we recently developed a method for preparing a conductive form of MoS2 (c-MoS2) using dilute aqueous hydrogen peroxide in a simple and safe way. Here, we investigate modulating the chemical and mechanical surface properties of c-MoS2 thin films using diazonium chemistry. In addition to a direct passivation strategy of c-MoS2 with diazonium salts for electron-withdrawing groups, we also propose a novel in situ synthetic pathway for modification with electron-donating groups. The obtained results are examined by Raman spectroscopy and X-ray photoelectron spectroscopy. The degree of surface passivation of pristine and functionalized c-MoS2 films was tested by exposing them to aqueous solutions of different metal cations (Fe2+, Zn2+, Cu2+, and Co2+) and detecting the chemiresistive response. While pristine films were found to interact with several of the cations, modified films did not. We propose that a surface charge transfer mechanism is responsible for the chemiresistive response of the pristine films, while both modification routes succeeded at complete surface passivation. Functionalization was also found to lower the coefficient of friction for semiconducting 2H-MoS2, while all conductive materials (modified or not) also had lower coefficients of friction. This opens up a pathway to a palette of dry lubricant materials with improved chemical stability and tunable conductivity. Thus, both in situ and direct diazonium chemistries are powerful tools for tuning chemical and mechanical properties of conductive MoS2 for new devices and lubricants based on conductive MoS2.

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Section: Results and Discussionmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tuning the Chemical and Mechanical Properties of Conductive MoS₂ Thin Films by Surface Modification with Aryl Diazonium Salts

et al. 2022

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“…While graphene is helpful for various applications, producing high-quality graphene is a challenging, expensive, and complex process. Fortunately, graphene research has enabled the exploration of many new 2D materials such as molybdenum disulfide, , black phosphorus, and transition metal oxides . However, in the past few years, a layered structure of transition metal carbides and nitrides had emerged as a new family of 2D materials due to their excellent electrical conductivity, chemical stability, and hardness. , These materials are commonly known as MXenes.…”

Section: Introductionmentioning

confidence: 99%

Surface-Modified MXenes: Simulation to Potential Applications

Saha

Dalmieda

Patel

2023

ACS Appl. Electron. Mater.

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MXenes are promising two-dimensional materials with good electrical conductivity, layered structure, biocompatibility, hydrophilicity, chemical inertness, and high surface area. Since the discovery of MXenes, they have been used for multiple applications, including energy storage, sensors, electronics, and optical devices. Theoretically, various MXenes are predicted by multiple studies, but few have been synthesized experimentally. The synthesized MXenes can possess various terminating groups that provide a great avenue to modify the surface of MXenes to fine-tune their chemical and physical properties. Notably, the terminating group of MXenes can be adjusted using diverse modification strategies, including covalent and noncovalent approaches. To advance future applications, it is necessary to have a deeper understanding of both theoretical and experimental approaches of MXenes. Although there have been some reviews on MXenes, less attention has been paid to the essential principle involved in surface modification using covalent and noncovalent chemistry and the controllable design of various MXenes compositions based on the theoretical calculations. This review focuses on a detailed understanding of the synthesis process of MXenes, as well as theoretical and experimental approaches toward the determination of their physical and chemical properties. In effect, both synthetic methods and postsynthesis functionalization will be complemented by density functional theory calculations. Furthermore, various functionalization strategies of MXenes have been discussed. Finally, we have provided an overview of current trends of modified MXenes in energy storage devices, electrocatalysts, and sensors applications with a brief comparison of the current state-of-the-art methods. This review will help researchers understand the feasibility of MXenes at the fundamental level for potential use in large-scale practical applications.

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“…In recent decades, transition metal sulfides (TMSs), such as MoS 2 , 4–10 VS 2 , 11–15 CoS 2 , 2,16–20 NiS 2 (ref. 2, 7, 15, 21 and 22) have been attracting attention from researchers and industry practitioners.…”

Section: Introductionmentioning

confidence: 99%

The effect of heteroatom doping on the active metal site of CoS₂ for hydrogen evolution reaction

2022

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Facile fabrication of conductive MoS₂ thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction

Abstract: Molybdenum disulfide (MoS2) has long been used in catalysis and is a promising material for energy conversion devices.

Cited by 15 publications

References 48 publications

Tuning the Chemical and Mechanical Properties of Conductive MoS₂ Thin Films by Surface Modification with Aryl Diazonium Salts

Tuning the Chemical and Mechanical Properties of Conductive MoS₂ Thin Films by Surface Modification with Aryl Diazonium Salts

Surface-Modified MXenes: Simulation to Potential Applications

The effect of heteroatom doping on the active metal site of CoS₂ for hydrogen evolution reaction

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Facile fabrication of conductive MoS2 thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction

Abstract: Molybdenum disulfide (MoS2) has long been used in catalysis and is a promising material for energy conversion devices.

Cited by 15 publications

References 48 publications

Tuning the Chemical and Mechanical Properties of Conductive MoS2 Thin Films by Surface Modification with Aryl Diazonium Salts

Tuning the Chemical and Mechanical Properties of Conductive MoS2 Thin Films by Surface Modification with Aryl Diazonium Salts

Surface-Modified MXenes: Simulation to Potential Applications

The effect of heteroatom doping on the active metal site of CoS2 for hydrogen evolution reaction

Contact Info

Product

Resources

About

Facile fabrication of conductive MoS₂ thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction

Tuning the Chemical and Mechanical Properties of Conductive MoS₂ Thin Films by Surface Modification with Aryl Diazonium Salts

Tuning the Chemical and Mechanical Properties of Conductive MoS₂ Thin Films by Surface Modification with Aryl Diazonium Salts

The effect of heteroatom doping on the active metal site of CoS₂ for hydrogen evolution reaction