Frontiers in Chemistry
·
2022
·
IF 5.545
Lei Yuxi,Xiao Xuefeng,Ma Tianpeng,Li Weiyin,Zhang Huan,Ma Chao
Layered transition metal dichalcogenides (TMDs), such as molybdenum ditelluride (MoTe2), have attracted much attention because of their novel structure-related physicochemical properties. In particular, semi-metallic-phase MoTe2 (1T′) is considered as a competitive candidate for low-cost electrocatalysts for water splitting. However, there are few reports on the simple hydrothermal synthesis of MoTe2 nanostructures compared with other layered TMDs. In this study, a facile one-step hydrothermal process was developed for the fabrication of layered MoTe2, in which uniform nanotubes with a few layers of 1T′ MoTe2 were fabricated at a lower temperature for the first time. The as-obtained MoTe2 nanotubes were fully characterized using different techniques, which revealed their structure and indicated the presence of layered 1T′ nanocrystals. The efficient activity of MoTe2 nanotubes for the electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 was demonstrated by the small Tafel slope of 54 mV/dec−1 and endurable ability, which is attributed to the abundant active sites and remarkable conductivity of 1T′ MoTe2 with a few-layer feature. This provides a facile method for the design and construction of efficient layered MoTe2 based electrocatalysts.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yi Wang,Xinyan Xiao,Jiayi Chen,Mingli Lu,Xingye Zeng
An ordered 1T/2H MoSe 2 possessed few-layers nanosheets structure was synthesized by a NaBH 4 -assisted hydrothermal method. Further, 1T/2H MoSe 2 was integrated with proton g-C 3 N 4 via solvothermal method, forming a novel 2D/2D heterostructure composite (1T/2H MoSe 2 /pg-C 3 N 4 ) with Z-scheme heterojunction. 1T/2H MoSe 2 /pg-C 3 N 4 had narrower bandgap, abundant active sites, as well as better photocurrent response and conductivity, confirmed by spectroscopic and electrochemical characterizations. Consequently, the optimal 1T/2H MoSe 2 /pg-C 3 N 4 at 1 wt% MoSe 2 loading showed enhanced TC (RhB) photodegrading rate of 92% (99%), within 80 min (45 min) of simulated solar light irradiation, being 3.0 (3.4) and 1.2 (1.2) times than that of pg-C 3 N 4 and 2H MoSe 2 /pg-C 3 N 4 , respectively. Additionally, active species trapping experiments indicated that O 2 − and h + were the main species of contaminants degradation over 1T/2H MoSe 2 /pg-C 3 N 4 . Combining with DRS, Mott-Schottky and VB XPS analysis, a reasonable 1T phase boosted Z-scheme MoSe 2 -based heterojunction mechanism was proposed.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yafeng Chen,Ge Meng,Tao Yang,Chang Chen,Ziwei Chang,Fantao Kong,Han Tian,Xiangzhi Cui,Xinmei Hou,Jianlin Shi
Earth-abundant MoS 2 has attracted great attentions as a promising hydrogen evolution reaction (HER) electrocatalyst , but it is limited by sluggish water dissociation and strong adsorption of the oxygen-containing intermediates in alkaline media. Herein, an interfacial engineering strategy to fabricate Co-doped 1T-MoS 2 coupling with V 2 C MXene was reported to improve the HER kinetics of MoS 2 . DFT calculations predict that the construction of heterogeneous interfaces between V 2 C MXene and Co-doped 1T-MoS 2 can effectively reduce the energy barrier of water dissociation and optimize the free energy of hydrogen adsorption. As a result, the synthesized Co-MoS 2 /V 2 C@CC nanohybrid exhibits excellent HER performance with small overpotentials of 70.1, 263.2 and 296 mV to achieve current densities of 10, 500 and 1000 mA cm −2 , respectively, and outstanding stability for 50 h HER test without degradation. Additionally, the overall hydrazine-assisted water splitting (OHzS) system catalyzed by Co-MoS 2 /V 2 C@CC in both anode and cathode requires only 0.33 V to achieve a current density of 10 mA cm −2 with significant long-term durability.
研究领域:
材料科学
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电催化
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8203-8214
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IF 3.925
Lingli Zhang,Han Tao,Chun Ji,Qiaoling Wu,Xiao Wang,Yuangeng Wu
As an alternative to bisphenol A (BPA), bisphenol S (BPS) is widely used in many consumer goods and industrial products. However, BPS has similar genotoxic, reproductive and endocrine disrupting effects to BPA and can enter the body through the food chain or by dermal absorption to endanger human health. This paper presents a rapid and direct electrochemical sensing technique for ultra-trace BPS determination on the basis of the signal amplification of the 1T phase & 2H phase hybrid MoS2 nanosheets (1T&2H-MoS2) and amino-functionalized carbon nanotube (CNTs-NH2) composites. The cooperative electrocatalytic effect and high-electrically active surface area of 1T&2H-MoS2/CNTs-NH2 composites not only facilitated the electron transfer between BPS and the electrode, but also promoted the adsorption of BPS on the electrode. Hence, the 1T&2H-MoS2/CNTs-NH2 modified electrode exhibited excellent electrocatalytic activity with a lower oxidation potential and higher peak current for BPS. Under the optimized conditions, the peak current response of BPS showed a good dose-dependent relationship with its concentration in the range of 0.02–1.0 μM and 1.0–70.0 μM, while the detection limit was as low as 8.6 nM. The proposed method was used to determine BPS in the mineral water bottle and orange juice samples with satisfactory spiked recoveries between 92.31% and 104.20%, demonstrating its reliability and practicality in real sample analysis. Furthermore, the sensing method has the characteristics of facile electrode fabrication, fast response (<4 min) and good reproducibility.
研究领域:
环境科学
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分析化学
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毒理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Enzi Chen,Qing Zhu,Yaoyu Duan,Junhao Tang,Runze Zhan,Jingwen Huang,Xi Wan,Kun Chen,Shaozhi Deng
Integrating high-quality dielectrics with two-dimensional (2D) transition metal chalcogenides (TMDCs) is crucial for high-performance electronics. However, the lack of dangling bonds on 2D material surfaces complicates direct dielectric deposition. We propose using atomic layer deposition (ALD) to integrate ultrathin high-κ dielectric directly on 1T′-MoTe2 surfaces, facilitating the creation of high-performance back-gated field-effect transistors (FETs). Exploiting 1T′-MoTe2’s natural oxidation in ambient conditions, we directly deposit dense and uniform HfO2 dielectric films below 5 nm, achieving an equivalent oxide thickness (EOT) of 0.97 nm. The resulting back-gate transistors, with a monolayer MoSSe on HfO2/1T′-MoTe2, show a current on/off ratio over 105 and operate at low voltages (<1 V), indicating high gating efficiency and a charge carrier mobility of 2.93 cm2V–1s–1. Additionally, we demonstrate a 6 × 5 bottom-gated array of MoSSe transistors using all-1T′-MoTe2 electrodes, achieving an 86.7% sample yield. Our approach also enables the creation of various integrated logic circuits such as inverters, NAND, and NOR gates. This research offers a feasible method for integrating high-κ dielectric films using industrially compatible ALD processes, providing excellent thickness control, uniformity, and scalability for 2D electronic devices.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Han Wang,Bingzhe Jia,Zhilin Zhao,Chunyan Luo,Xinming Wu
Two-dimensional (2D) materials used in potassium ion batteries (PIBs) have high theoretical capacitance and excellent rate characteristics. However, the origin of low diffusion of potassium ions and poor storage kinetics still remain challenge mainly due to the large size of potassium ions (0.138 nm) and narrow 2D interlayer spacing. Herein, the V 2 CT x -based hybrids including 1T-MoS 2 (1T -MoS 2 @V 2 CT x ) has been successfully constructed by the magneto-hydrothermal method and proved to be an eminent anode, which can make PIBs have high reversible capacity and eminent rate performance at the same time. Moreover, the combination of 2D 1T-MoS 2 and V 2 CT x not only significantly promotes the transfer of interfacial charges as well as accelerates the transmission and diffusion of electrons and K + , but also helps to alleviate the volume changes caused by the insertion/extraction of large-sized K + during the cycle, which makes the electrode exhibit good cycle stability. Density functional theory (DFT) indicates that the synergy effect between 1T-MoS 2 and V 2 CT x has significantly strengthened the potassium affinities and ion diffusion kinetics in the 1T-MoS 2 @V 2 CT x anode by reducing the ion diffusion energy barrier, thereby showing outstanding K + storage performance, especially in 1T-MoS 2 @V 2 CF 2 . As a result, the 1T-MoS 2 @V 2 CT x anode shows a high reversible capacity of 887.3 mA h g −1 at 0.1 A g −1 , eminent rate performance of the capacity maintaining 563.6 mA h g −1 at 2.0 A g −1 and remarkable cycle stability of 601.2/374.7 mA h g −1 with 69.4/56.5% capacity retention after 2000 cycles at 1.0/2.0 A g −1 . This work provides a new way for the exquisite design of 2D composite electrodes with excellent performance in PIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yinghong Ji,Xiaoyan Ding,Yanjun Xue,Jingjing Wang,Jian Tian
The formation of composites by loading co-catalysts on semiconductor photocatalysts to improve hydrogen (H 2 ) evolution performance is a feasible strategy. Metallic 1T phase molybdenum disulfide (MoS 2 ) as cocatalysts were decorated on zinc indium sulfide (ZnIn 2 S 4 ) nanoflowers by a grinding method to construct 1T-MoS 2 @ZnIn 2 S 4 composites. The H 2 production rate of 1T-MoS 2 @ZnIn 2 S 4 composites with optimum 7 wt% 1T-MoS 2 loading achieves 15.6 mmol g −1 h −1 , 5.5 times higher than ZnIn 2 S 4 nanoflowers. The apparent quantum efficiency (AQY) increases from 3.1 % (ZnIn 2 S 4 nanoflowers) to 13.0 % (1T-MoS 2 @ZnIn 2 S 4 composites) under the wavelength light irradiation at λ = 370 nm. The loading of metallic 1T-MoS 2 with abundant edge and substrate active sites on ZnIn 2 S 4 can enhance visible light absorption, promote the transfer of electrons, and inhibit carrier recombination, thereby improving photocatalytic performance. This work offers inspiration for the design of composite photocatalysts with efficient photocatalytic capabilities.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 14
·10302-10312
·
IF 2.993
Fan Hongmei,Wu Rong,Liu Haiyang,Yang Xi,Sun Yanfei,Chen Chu
Hybrid-phase-MoS 2 (1T@2H-MoS 2 ) nanosheet-coated black TiO 2 spheres (1T@2H-MoS 2 /B-TiO 2 ) were prepared using a hydrothermal method and a chemical reduction method under an argon atmosphere. X-ray diffraction, transmission electron microscope, Raman spectra and X-ray photoelectron spectroscopy indicated the generation of the 1T@2H-MoS 2 and black TiO 2 . The efficiency of the 1T@2H-MoS 2 /B-TiO 2 core–shell structure degradation of rhodamine B (RhB) reached 98.0%. The high photocatalytic activity was due to the presence of 1T-MoS 2 , which accelerated the electron transfer to participate in the redox reaction. In addition, the presence of B-TiO 2 suppressed the undesirable electron–hole recombination. Finally, the synergistic effect between 1T@2H-MoS 2 and B-TiO 2 promoted the separation of the photoelectron–hole pairs. Moreover, scavenger studies found that the hydroxyl radical ( • OH) was the dominant reactive oxygen species in the degradation of RhB under visible light irradiation. The possible growth mechanism and photocatalytic mechanism are discussed in detail. The results of this study will contribute to the improvement in the visible light absorption and photocatalytic degradation of catalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 8
·2897-2910
·
IF 6.4
Mei Wu,Hongchang Wang,Xiaohui Liang,Dunhui Wang
In this work, we designed the flower-like structure of 1T/2H-MoS2@α-Fe2O3 nanocomposites with high-efficiency microwave absorption, in which the α-Fe2O3 microdrums are attached to the surface of 1T/2H-MoS2 constituting a special flower-like morphology. During the synthesis process, the content of α-Fe2O3 microdrums plays a significant, constructive role in the dielectric properties and impedance matching characteristics of the 1T/2H-MoS2@α-Fe2O3 nanocomposites. The optimal reflection loss (RL) value of the flower-like nanocomposites can reach −61.18 dB at low frequency (6.52 GHz), while the RL value is also −56.98 dB at 4.43 GHz with a lower frequency. Furthermore, the frequency bandwidth below −10 dB was up to 4.68 GHz with an effective absorption frequency range of 13.32–18 GHz when the thickness was 1.82 mm. The results show that excellent electromagnetic wave absorption capabilities of the 1T/2H-MoS2@α-Fe2O3 nanocomposites in the low frequency range mainly benefit from the perfect coordination of multiphase MoS2 and α-Fe2O3 microdrums, which makes them achieve perfect impedance matching in the low frequency range. This provides a simple demonstration for the development of highly efficient electromagnetic wave absorption materials in the low frequency range.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhiyuan Yu,Tianyi Huang,Shafqat Ullah,Yujun Wang,Guangsheng Luo
1T-phase MoS2, a versatile two-dimensional transition-metal dichalcogenide, is typically synthesized using a one-pot hydrothermal method. However, inadequate control of the sulfurization, reduction, and crystallization processes in the autoclave leads to multilayer 1T-MoS2 with high crystallinity, a small surface area, and few defects. Considering the aforementioned issues, a two-stage microreactor continuous hydrothermal flow synthesis (CHFS) system coupled with accurate control and rapid processing is used to prepare 1T-MoS2 with abundant voids and a large surface area under 250 °C and 4.0–4.5 MPa. And density functional theory calculations reveal that nitrogenous species, acting as reductants and electron donors, lower the energy of 1T-MoS2 by intercalation and surface adsorption, facilitating its swift synthesis within the presulfurization stage for 10 min and reduction stage for 24 min. The precisely controlled synthesis of porous 1T-MoS2, originating from prenucleation clusters, results in a large surface area of 201.5 m2/g, concentrated mesopores of 2–5 nm, and a pore volume of 0.58 cm3/g. Moreover, a significant transformation from the 1T to the 2H phase is prevented by rapid cooling downstream of the CHFS system.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 16
·9246-9254
·
IF 6.895
Junxiao Huang,Xuelei Pan,Xiaobin Liao,Mengyu Yan,Bruce Dunn,Wen Luo,Liqiang Mai
1T-MoS2 is widely used in the hydrogen evolution reaction (HER) due to its abundant active sites and good conductivity. However, 1T-MoS2 is thermodynamically metastable due to the distorted crystal structure. Recently, researchers have detected the J1 and A1g Raman peaks after the HER process and confirmed that the 2H–1T phase possesses good stability. Therefore, continuous HER is likely to transform 1T-MoS2 into a stable 2H–1T mixed phase. The in situ characterization of 1T-MoS2 individual nanosheets in the HER process is important to understand the intrinsic electrocatalytic behaviour at confined nanoscale, which has rarely been investigated. Herein, we built an individual 1T-MoS2 nanosheet micro–nano device by the intercalation of N-butyllithium into 2H-MoS2. Then, the device was kept at an overpotential (η) of 450 mV, which was much lower than the onset potential, for 20 minutes to ensure continuous HER. Through this electrochemical treatment, we successfully obtained a mixed phase of 2H–1T and monitored the electrochemical phase transition by in situ Raman mapping and atomic force microscopy (AFM). The HER performance of the 2H–1T phase was superior to that of 1T-MoS2 and 2H-MoS2. Additionally, computational simulations demonstrated that the 2H–1T phase exhibited optimal hydrogen adsorption energy. The presented work displays the excellent catalysis of the mixed phase obtained by the electrochemical phase transition, which provides new directions for improving the catalytic activity of TMDs.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Raheela Naz,Muhammad Imtiaz,Qinglei Liu,Lulu Yao,Waseem Abbas,Tengfei Li,Imran Zada,Yang Yuan,Wenshu Chen,Jiajun Gu
Highly defective molybdenum disulfide (MoS 2 ) nanosheets of 1T phase are synthesized on a three-dimensional reduced graphene oxide (3D RGO) network through a one-pot hydrothermal method . By switching the reaction time, the resulting MoS 2 's phases (1T or 2H) and defect-density are successfully controlled. Reducing the reaction time from 20 to 6 h increases the defect-density and induces a phase transition from hybrid 2H/1T to 1T phase. High defect-density coupled with high 1T-phase portion in MoS 2 nanosheets/RGO heterostructures enhances the electrochemical performance for supercapacitor application by inducing additional active sites, which provide fast charge transfer rate and a large number of ion diffusion channels. Among all samples, the defect rich 1T-phase MoS 2 nanosheets/RGO heterostructure synthesized in 6 h (M/RGO-6) gives an outstanding specific capacitance of 442.0 F g −1 at a current density of 1 A g −1 . The M/RGO-6 also exhibits excellent cycling stability with capacitance retention of 90.3% over 1000 cycles at 5 A g −1 . These make M/RGO-6 attractive to the electrode of high-performance supercapacitors .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）