Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 43
·11651-11658
·
IF 5.976
Yishuo Hu,Xiangbin Zeng,Tingting Ren,Shaoxiong Wu,Wenzhao Wang,Yang Zeng,Guangtong Zhou,Zhenyu Guo,Wen Jin,Shibo Wang,Yonghong Xiao,Jingjing Lu
Ultrathin 1T@2H-MoS2 films have excellent electronic and optical properties, and are potentially applicable in optics, electronics, energy storage, and sensing technology. However, identification of an efficient method to produce 1T@2H-MoS2 films with controllable thickness is challenging. This study describes the rapid synthesis (5–10 min) of 1T@2H-MoS2 thin films on Si/SiO2 substrates by a novel pulsed laser irradiation method. We verify the photodecomposition reaction model by measuring the UV-Vis absorption spectra of the reactants. The thickness of the synthesized MoS2 film can be controlled by adjusting the concentration of the precursor. Structural characterization confirms that both the 1T and 2H phases exist in the MoS2 film. The 1T phase enhances the conductive behavior of the MoS2 film and induces magnetism. Furthermore, pure 1T-MoS2 can be separated selectively from the MoS2 film under specific operating conditions using pulsed laser-induced synthesis. This approach is suitable for the synthesis of films of MoS2 and other 2D materials, including 1T phase-pure films.
研究领域:
材料科学
·
光学
·
电子学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Mei Liang,Sun Mingzi,Yang Ruijie,Zhang Yaqin,Zhang Yuefeng,Zhang Zhen,Zheng Long,Chen Ye,Zhang Qinghua,Zhou Jiang,Zhu Ye,Leung Kenneth M. Y.,Zhang Wenjun,Fan Jun,Huang Bolong,Zeng Xiao Cheng,Shin Hyeon Suk,Tang Chuyang Y.,Gu Lin,Voiry Damien,Zeng Zhiyuan
Two-dimensional (2D) materials, as adsorbents, have garnered great attention in removing heavy metal ions (HMIs) from drinking water due to their extensive exposed adsorption sites. Nevertheless, there remains a paucity of experimental research to remarkably unlock their adsorption capabilities and fully elucidate their adsorption mechanisms. In this work, exceptional lead ion (Pb 2+ ) (a common HMI) removal capacity (up to 758 mg g −1 ) is achieved using our synthesized metallic 1T/1T′ phase 2D transition metal dichalcogenide (TMD, including MoS 2 , WS 2 , TaS 2 , and TiS 2 ) nanosheets, which hold tremendous activated S chemisorption sites. The residual Pb 2+ concentration can be reduced from 2 mg L −1 to 2 μg L −1 within 0.5 min, meeting the drinking water standards following World Health Organization guideline (Pb 2+ concentrations <10 μg L −1 ). Atomic-scale characterizations and calculations based on density functional theory unveil that Pb 2+ bond to the top positions of transition metal atoms in a single-atom form through the formation of S-Pb bonds. Point-of-use (POU) devices fabricated by our reported metallic phase MoS 2 nanosheets exhibit treatment capacity of 55 L-water g −1 -adsorbent for feed Pb 2+ concentration of 1 mg L −1 , which is 1-3 orders of magnitude higher than other 2D materials and commercial activated carbon.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Dezhi Wang,Boyu Su,Yan Jiang,Lu Li,Boon K. Ng,Zhuangzhi Wu,Fangyang Liu
Molybdenum disulfide (MoS 2 ) has emerged as a prominent nanomaterial in photoelectrocatalytic water splitting due to its appropriate energy band and low production cost. However, its low-density active site and poor-efficiency electron transfer have essentially limited the photoelectrocatalytic properties. In this present study, we have proposed a simple yet novel ammoniated molybdenum disulfide with a unique 1T/2H heterostructure as the photoelectrocatalyst via a facile hydrothermal reaction. The presence of the 1T phase in MoS 2 is found to enhance the electronic conductivity as well as boost the density of the active site, resulting in an increase in efficiency for both electron transfer and mass transport. More importantly, the synergistic effect of the 1T/2H heterostructure of MoS 2 has been demonstrated to improve the photoelectrocatalytic properties.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 11
·2933-2938
·
IF 8.183
Gao Xiang,Xiong Liukang,Wu Jiabin,Wan Jun,Huang Liang
Two-dimensional molybdenum disulfide (2D MoS 2 ) is considered as a promising candidate for many applications due to its unique structure and properties. However, the controllable synthesis of large-scale and high-quality 2D 1T-phase MoS 2 is still a challenge. Herein, we present the scalable and controllable synthesis of 2D MoS 2 from 2H to 1T@2H phase by using K 2 SO 4 salt as a simultaneous high-temperature sulfur source and template. The as-synthesized 1T@2H-2D MoS 2 exhibits a high yield and can be easily assembled into freestanding electrode with high specific capacitance of 434 F/g at a scan rate of 1 mV/s in LiClO 4 ethylene carbonate/dimethyl carbonate (EC/DMC). Moreover, various single-crystal 2D transition metal sulfides (WS 2 , PbS, MnS and Ni 9 S 8 ) and 2D S-doped carbon can be synthesized using this method. We believe that this study may provide a new sight for scalable and controllable synthesis of other 2D materials beyond 2D MoS 2 .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Communications Physics
·
2019
·Vol. 2
·期 1
·1-7
·
IF 0
Bu Kunliang,Zhang Wenhao,Fei Ying,Wu Zongxiu,Zheng Yuan,Gao Jingjing,Luo Xuan,Sun Yu-Ping,Yin Yi
Tuning the electronic properties of a matter is of fundamental interest in scientific research as well as in applications. Recently, the Mott insulator-metal transition has been reported in a pristine layered transition metal dichalcogenide 1 T -TaS \({}_{2}\) , with the transition triggered by an optical excitation, a gate controlled intercalation, or a voltage pulse. However, the sudden insulator-metal transition hinders an exploration of how the transition evolves. Here, we report the strain as a possible new tuning parameter to induce Mott gap collapse in 1 T -TaS \({}_{2}\) . In a strain-rich area, we find a mosaic state with distinct electronic density of states within different domains. In a corrugated surface, we further observe and analyze a smooth evolution from a Mott gap state to a metallic state. Our results shed new lights on the understanding of the insulator-metal transition and promote a controllable strain engineering on the design of switching devices in the future.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Benteng Sun,Zhangqian Liang,Yeye Qian,Xuesong Xu,Ye Han,Jian Tian
Here, we reported that sulfur vacancy-rich O-doped 1T-MoS2 nanosheets (denoted as SV-1T-MoS2) can surpass the activity of Pt as cocatalysts to assist in the photocatalytic nitrogen fixation of CdS nanorods. SV-1T-MoS2 cocatalysts exhibit sulfur vacancies, O-doping, more metallic 1T phase, and high electronic conductivity, thus leading to the exposure of more active edge sites, high Brunauer–Emmett–Teller surface area, enhanced visible light absorption, and improved electron separation and transfer, which are beneficial for photocatalytic nitrogen fixation. Consequently, the optimized 30 wt % SV-1T-MoS2-/CdS composites exhibit an outstanding nitrogen fixation rate of 8220.83 μmol L–1 h–1 g–1 and long-term stability under simulated solar light irradiation, significantly higher than pure CdS nanorods, CdS–Pt (0.1 wt %), and 30 wt % 1T-MoS2/CdS composites. The catalytic mechanism of photocatalytic nitrogen fixation on SV-1T-MoS2 is discussed by density functional theory calculations.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xitao Li,Xinding Lv,Xiangnan Sun,Chen Yang,Yan-Zhen Zheng,Lihui Yang,Siqi Li,Xia Tao
Abundant electrochemical active sites, high electronic conductivity as well as stable structure and electrochemical activity are indispensable but usually incompatible to the ideal electrocatalysts for hydrogen evolution reaction (HER). Herein, an efficient and stable MoS 2 -Ti 3 C 2 MXene electrocatalyst is synthesized using a delicately designed one-step hydrothermal method, in which the few-layers thick, edge-oriented, high-percentage 1T′-phase (∼ 85.0 %) MoS 2 nanosheets are well grown on the cation-modified Ti 3 C 2 MXene and stabilize Ti 3 C 2 MXene against spontaneous oxidation caused by dissolved-oxygen. The structure and phase engineering of MoS 2 as well as the fully surface-shielding Ti 3 C 2 MXene endow the as-synthesized MoS 2 -Ti 3 C 2 MXene electrocatalyst with a wealth of accessible active sites and high electrical conductivity for HER together with excellent structure stability. Consequently, the as-synthesized MoS 2 -Ti 3 C 2 MXene exhibits remarkable electrocatalytic HER performance in acidic medium with a low overpotential of 98 mV at 10 mA cm -2 , a depressed Tafel slope of 45 mV dec -1 and a low electrochemical resistance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yi Wang,Xinyan Xiao,Tingting Ding,Mingli Lu
The transition-metal dichalcogenides (TMDs) with 1T phase structure holds great promise for providing abundant active sites and superior conductivity, while the achievement of highly efficient degradation activity over bare TMDs and TMDs-based photocatalysts is still challenges. In this work, a flower-like mixed 1T-2H phase MoSe 2 was synthesized via a sodium borohydride (NaBH 4 )-assisted solvothermal method, and then was selected as a “charge-transfer-bridge” to fabricate a dual Z-scheme AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite with a 0D/3D hierarchical structure. The optimal AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite exhibited the superior photocatalytic activity towards degrading RhB and TC relative to AgI/2H MoSe 2 /Bi 4 O 5 Br 2 and AgI/Bi 4 O 5 Br 2 . The enhancement is attributed to its better light absorption, abundant active sites, and superior charge carrier mobility and separation efficiency, resulted from synergetic effect of 0D/3D structural coupling and energy band matching. Moreover, the important energy band alignments and mixed 1T-2H phase MoSe 2 boosting photocatalytic mechanism of as-prepared AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 heterojunction were investigated. This work describes a competitive design and fabrication technique for constructing novel mixed phase TMDs-based Z-scheme heterojunctions to address environmental issues.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Yaning Zhang,Shiyuan Fan,Siqi Gong,Huibin Liu,Huiting Xu,Junjie Qi,Honghai Wang,Chunli Li,Wenchao Peng,Jiapeng Liu
Capacitive deionization (CDI) has attracted significant attention as a water treatment technology owing to its low cost, high efficiency, and eco-friendliness. However, the unsatisfactory desalination performance of traditional electrode materials hinders the development of CDI. Herein, 1T-MoS 2 /C hybrid microspheres are successfully fabricated through confinement and phase engineering strategies. The confinement effect of porous hollow carbon microspheres reduces the overgrowth and agglomeration of MoS 2 nanosheets, which is beneficial for exposing more active sites and enhancing stability. Meanwhile, the 1T phase MoS 2 displays high intrinsic conductivity and large interlayer spacing, which is conducive to rapid insertion/extraction of Na + . Consequently, 1T-MoS 2 /C hybrid becomes a prospect electrode material for CDI, which showcases outstanding desalination capacity (48.1 mg/g at 1.2 V), eminent desalination rate as well as exceptional stability. Moreover, the desalination mechanisms are clarified through various characterizations and density functional theory calculations. This study provides new perspectives on designing high-performance MoS 2 -based CDI electrode materials.
研究领域:
材料科学
·
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yao Yao,Wenbin Dong,Zhen Zhao,Huina Cui,Gangli Liao
Metastable 1T phase transition-metal dichalcogenides materials have attracted substantial interest as a potential catalyst for photodegradation . However, methods for synthesizing 1T-WS 2 are limited and complicated. Herein, a flexible, structural stable, easy recovery and reusable photocatalyst 1T-WS 2 /Carbon cloth was developed through a simple solvothermal synthesis route. Vertically aligned 1T-WS 2 with large surface area renders ultrahigh photocatalytic activity and durability with respect to organic pollution methylene blue under simulated sunlight illumination. As a consequence, the 1T-WS 2 /CC-200 catalyst presents an improved photodegradation rate as high as 96 % and excellent reusability in continuous test mode. Moreover, the metastable 1T-WS 2 does not transform to stable 2 H phase, even after a five-months exposure in ambient, making the 1T-WS 2 /CC a promising photocatalyst for practical application.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2018
·Vol. 11
·期 9
·4587-4598
·
IF 7.994
Zhang Jingtong,Chen Yalan,Liu Ming,Du Kun,Zhou Yan,Li Yanpeng,Wang Zhaojie,Zhang Jun
Few-layered MoSe 2 nanosheets with mixed 1T/2H phase were successfully arrayed on a Ti substrate (forming 1T@2H-MoSe 2 /Ti) through a facile one-step solvothermal process. After testing different synthesis conditions, it was found that the optimal process involves a temperature of 200 °C and a reaction time of 12 h. Structural characterizations reveal that the morphology of 1T@2H-MoSe 2 consists of edge-terminated nanosheets with one to five layers, composed of a mixed 1T/2H phase dominated by the 1T one. The 1T@2H-MoSe 2 /Ti electrode shows excellent HER catalytic activity, with a small onset potential (−120 mV vs. reversible hydrogen electrode, RHE) and an electrode potential of only −133 mV (vs. RHE) to achieve a current density of 20 mA·cm −2 . This excellent electrocatalytic activity is due to the synergistic effects of 1T metallic phase, few-layered nanosheet morphology, and direct growth of 1T@2H-MoSe 2 on the Ti substrate. In addition, the 1T@2H-MoSe 2 /Ti electrode shows excellent stability towards long-term electrolysis. This is due to the long-term stability of the valence states of Mo and Se, as shown by post-electrolysis X-ray photoelectron spectroscopy analysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zheng Wang,Jiawei Wang,Fumin Wang,Xubin Zhang,Xinyuan He,Shuai Liu,Zhengliang Zhang,Zhiwei Zhang,XingTao Wang
Elemental-doped is considered as an effective strategy to modulate the electronic structure of Metallic MoS 2 (i.e., 1T-MoS 2 ) and enhance its electrochemical performance. Herein, DFT is applied to predict the electronic structure of different transition metals (TMs) doped 1T-MoS 2 . Based on the results, stable Ni-doped 1T-MoS 2 (N 3 MS) is synthesized in a propionic acid (PA) aided system. Electrochemical tests show that N 3 MS possesses an excellent specific capacitance of 2461.2 F·g −1 at 1 A·g −1 and a cycle retention rate of 85.67 % at 10 A·g −1 for 1000 cycles due to the critical contribution of Ni-doped to electronic structure modulation. Meanwhile, in-situ Raman measurements show that the active sites of N 3 MS are Mo 3+ and Ni 2+ . The assembled N 3 MS//ZnO/ZnS-C hybrid device shows a specific capacitance of 242.28 F·g −1 at 1 A·g −1 , an excellent energy density of 65.96 Wh·kg −1 at the power density of 700 W·kg −1 and the excellent stability for up to 2000 cycles (77.26 % retention at 5 A·g −1 ). This work proves the significant contribution of elemental doping to modulate electronic structures and improve electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）