Green Energy & Environment
·
2025
·
IF 14.6
Wenjun Zhu,Bofeng Zhang,Fanxing Bu,Minghai Zhao,Xinyong Tao,Keli Liu,Yuwen Fang,Wei Luo
1T-MoS 2 nanosheets, with metallic conductivity and high capacity, hold great potential for lithium-ion capacitors (LICs), but suffer from sluggish reaction kinetics due to dense stacking. Herein, 1T-MoS 2 nanosheets with enlarged interlayer spacing, vertically bonded to reduced graphene oxide (rGO) (1T-MoS 2 /rGO), were designed using a hydrothermal-assisted dispersion and intercalation strategy. The active nitrogen species derived from N, N-dimethylformamide (DMF) not only bridge the rGO and MoS 2 through strong Mo-N-C bonds to promote the formation of dispersed MoS 2 nanosheets, but also intercalate into the MoS 2 structure, further enlarging the interlayer spacing. This unique structure synergistically enhances meso- and microscale mass transfer outside and inside of the few-layered nanosheets, significantly improving electrochemical reaction kinetics and reducing the kinetic mismatch between the anode and cathode. Consequently, the resulting 1T-MoS 2 /rGO achieves a capacity of 500 mAh g -1 after 500 cycles at 5 A g -1 and a high rate performance of 587 mAh g -1 at a high rate of 10 A g -1 . Moreover, the assembled 3D vertical 1T-MoS 2 /rGO//AC LIC delivers a high energy density of 100.3 Wh kg -1 at a power density of 1.0 kW kg -1 , and long cycle stability with capacity retention as high as 91.02% after 5000 cycles at 2 A g -1 . This work provides a generalizable strategy for engineering two-dimensional material-based electrodes, offering new insights into high-performance energy storage systems.
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
Nanomaterials
·
2021
·Vol. 11
·期 12
·3273
·
IF 5.076
Kunjie Wang,Jiahui Zhang,Yachen Ye,Hongbin Ma,Bingxin Liu,Peng Zhang,Benhua Xu
1T-phase molybdenum disulfide is supposed to be one of the non-precious metal-based electrocatalysts for the hydrogen evolution reaction with the highest potential. Herein, 1T-MoS2nanosheets were anchored on N-doped carbon nanotubes by a simple hydrothermal process with the assistance of urea promotion transition of the 1T phase. Based on the 1T-MoS2nanosheets anchored on the N-doped carbon nanotubes structures, 1T-MoS2nanosheets can be said to have highly exposed active sites from edges and the basal plane, and the dopant N in carbon nanotubes can promote electron transfer between N-doped carbon nanotubes and 1T-MoS2nanosheets. With the synergistic effects of this structure, the excellent 1T-MoS2/ N-doped carbon nanotubes catalyst has a small overpotential of 150 mV at 10 mA cm−2, a relatively low Tafel slope of 63 mV dec−1, and superior stability. This work proposes a new strategy to design high-performance hydrogen evolution reaction catalysts.Keywords:1T-MoS2nanosheets;N-doped carbon nanotubes;hydrogen evolution reaction;water splitting;synergy effects
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 18
·6941-6950
·
IF 6.482
Dongli Chen,Wenwei Zhan,Xue Fu,Ming Zhu,Jinle Lan,Gang Sui,Xiaoping Yang
Lithium–sulfur (Li–S) batteries with high theoretical capacity and low cost are challenged by the polysulfide shuttle effect and sluggish reaction kinetics. Herein, a functional composite interlayer consisting of metallic 1T-MoS2 with high catalytic activity and carbon fiber cloth is firstly designed and fabricated for high-performance Li–S batteries. The 1T-MoS2@carbon fiber cloth (1T-MoS2@CFC) composite interlayer with high electrical conductivity not only serves as the upper current collector to improve the utilization of the sulfur cathode, but also acts as a polysulfide barrier and trapper to suppress the shuttle effect of polysulfides by strong chemical interaction.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Xiaorong Gan,Lawrence Yoon Suk Lee,Kwok-yin Wong,Tsz Wing Lo,Kwun Hei Ho,Dang Yuan Lei,Huimin Zhao
The phase transition of multilayer MoS2 nanosheets from semiconducting 2H to metallic 1T (2H/1T) has been realized mainly by chemical methods (e.g., Li intercalation). Here, we develop a simple yet effective method, cyclic voltammetry, to successfully tune the 2H/1T phase transition of multilayer MoS2 nanosheets without using intercalation species. The phase transition is triggered by the electrochemical incorporation of S vacancies (obtained by electrochemical etching), which on the one hand injects electrons into the framework of S–Mo–S and on the other hand facilitates the sliding of S planes. Density functional theory calculations show that O doping in the framework of S–Mo–S decreases the energy barrier for forming S vacancies and stabilizes the 1T-phase by occupying the 4d orbital of Mo. Our calculations further show that the presence of S vacancies and O incorporation not only reduces the bandgap of MoS2, indicating an increased conductivity, but also decreases the hydrogen adsorption free energy, implying significant improvement of hydrogen evolution reaction (HER) activity. Indeed, the overpotential and Tafel plot of the electrochemically treated MoS2 nanosheets are decreased respectively by 174 mV and 25 mV/dec at a cathodic current density of 10 mA cm–2 compared with pristine 2H-MoS2 nanosheets. The HER experiment also reveals the order of catalytical activity for the studied phases and structural defects: 1T-MoS2 > S vacancies > O doping >2H-MoS2. Our study has provided a new route to control the phase transition of multilayer MoS2 nanosheets with promising applications potentially in catalysis and optoelectronics.
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
·
理论化学
✓ 已验证
产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jianjian Yi,Xiaojie She,Yanhua Song,Mao Mao,Kaixiang Xia,Yuanguo Xu,Zhao Mo,Jingjie Wu,Hui Xu,Huaming Li
To date, despite significant achievements in noble-metal co-catalysts, it is still challenging to develop high-performance noble-metal-alternative co-catalysts for economic hydrogen production. In this work, we demonstrate that the metallic 1T-WS 2 obtained through a facile solvothermal method can function as co-catalyst for boosting the photocatalytic hydrogen production with the merits below: (i) noble-metal-free; (ii) excellent electrical conductivity; (iii) extra active sites on basal plane rather than edge sites for H 2 generation. As demonstrated in photocatalytic hydrogen evolution, the designed composite using two-dimensional carbon nitride (2D-C 3 N 4 ) as semiconductor and 1T-WS 2 as co-catalyst (1T-WS 2 /2D-C 3 N 4 ) exhibits giant enhancement, in comparison with the bare 2D-C 3 N 4 and 2H-WS 2 /2D-C 3 N 4 . This work highlights the surface engineering strategy of co-catalysts such as phase engineering for promoting the photocatalytic performance.
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
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Haiyang Yu,Zhenzhu Wang,Jiangfeng Ni,Liang Li
Molybdenum disulfide (MoS 2 ) is a promising electrode material for sodium-ion batteries as it offers a large capacity through a distinct conversion reaction. However, the electrochemical potential of MoS 2 is often restrained by the poor conductivity as the dominant 2H phase is a semiconductor while the metallic 1T phase is thermodynamically unstable. In this work, we report a hybrid design and material preparation of freestanding nanosheets of MoS 2 composed of both 1T and 2H phases based on mild hydrothermal reaction . The introduction of the metallic 1T-MoS 2 phase into 2H-MoS 2 and their intimate hybridization enable a significant improvement in electronic conductivity, while the freestanding architecture avoids possible electrochemical aggregation. When used as electrodes for sodium storage, such a hybrid MoS 2 affords a high capacity of ∼500 mA h g −1 at 0.5 A g −1 after 300 cycles, and retains capacity of ∼200 mA h g −1 at a high current rate of 4 A g −1 , thus demonstrating their potential in high-performance battery applications.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yue Tian,Xiaoyan Liu,Xiaoqing Cao,Dieqing Zhang,Shuning Xiao,Xinru Li,Zaiyuan Le,Xianyang Li,Hexing Li
1T MoS 2 has recently attracted growing interests for energy storage due to the excellent conductivity, expanded layer space and extra exposed active sites. However, its application is still limited due to the complicated synthesis under harsh condition and poor structural stability. Herein, we report a novel MoS 2 /Cu nanowires (NWs) by microwave-assisted self-assembly of ultrathin 1T MoS 2 onto Cu NWs with interconnected conductive network and robust one-dimensional (1D) structure. As anode material for LIBs, 1T MoS 2 /Cu NWs exhibits high capacity and stability owning to the enhanced electron transport and lithium ions intercalation. Meanwhile, the enriched nanovoids supply extended space for buffering the volume change and boosting electrolyte penetration during cycling process. Moreover, Cu doped MoS 2 could also stabilize the 1T phase, leading to the excellent anode durability. It delivers a high reversible capacity of 570.6 mAh g −1 after 250 cycles at a current density of 0.5 A g −1 . Enhanced rate performance is also achieved with excellent capacity retention of 914.6 mAh g −1 at 0.1 A g −1 and 465.2 mAh g −1 at 2 A g −1 , respectively.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 24
·10437-10446
·
IF 6.7
Xiaodan Yin,Wei Zheng,Haifeng Tang,Peigen Zhang,ZhengMing Sun
Electrode materials play a crucial role in the electrochemical performance of supercapacitors (SCs). In recent years, 1T-MoS2 and MXene have been extensively studied as potential electrode materials. However, 1T-MoS2 suffers from the metastable property, rigorous synthesis process, and nanosheet restacking issue, while the specific capacitance of MXene is restricted, limiting their supercapacitor performance. To fully exploit the advantages of both materials and address their respective problems, 1T-MoS2/Ti3C2Tz 2D/2D heterostructures are synthesized through a simple hydrothermal method. The existence of heterojunctions is confirmed by XPS and TEM. The different ratios between MoS2 and Ti3C2Tz are investigated, and the electrochemical test is carried out in a “water-in-salt” electrolyte (20 mol kg−1 LiCl). The results demonstrate that the heterostructures exhibit enhanced electrochemical performance. The optimized ratio of 1T-MoS2/Ti3C2Tz is 2 : 1, and the specific capacitance reaches 250 F g−1 at 1 A g−1 with a wide potential window of −0.9 to 0.5 V vs. Ag/AgCl. The capacitance retention is 82.3% (at 10 A g−1) after 5000 cycles, and the average coulombic efficiency (ACE) was 99.96%. Assembled into symmetric SCs (SSCs), the energy density of 12.0 W h kg−1 at a power density of 139.9 W kg−1 is achieved with a high voltage of 1.4 V. It also has 82.6% capacitance retention and 99.95% ACE after 5000 cycles at 5 A g−1. This work is expected to stimulate novel research towards the wide application of 2D/2D heterostructures in SCs.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 1
·263-275
·
IF 3.186
Wei Jian,Huang He,Luo Qinglong,Liu Na,Wang Xueying,Wang Xuefeng,Zhong Mei,Huang Xueli
Few layer (< 5 layers) MoS 2 mixed with a 1T phase has the characteristics of a large specific surface area and an improved active site distribution. Therefore, it has been increasingly study for the catalytic hydrodesulfurization of polycyclic compounds. In this paper, few-layer MoS 2 with a high proportion of the 1T phase is synthesized by a one-step solvothermal method using a green non-toxic ethanol/water solvent. Results show that few-layer MoS 2 (3–5 layers) with a 1T phase up to 48% can be synthesized in a 50% ethanol solvent. This MoS 2 is used to catalyse the hydrodesulfurization reaction of dibenzothiophene, and the target product conversion rate reaches 84.2%. Among them, biphenyl accounts for 70.2%, phenylcyclohexane accounts for 13.9%, and bicyclohexane accounts for 0.4%. According to the Hansen solubility parameter (HSP) distance Ra, the effects of solvents on the structure and morphology of MoS 2 and the conversion of dibenzothiophene hydrodesulfurization are determined. This work is significant for the synchronous synthetic exfoliation of MoS 2 with a controllable number of layers, a higher ratio of the 1T phase and good catalytic HDS of polycyclic compounds. Graphic Abstract Few layers and high proportion of 1T phase MoS 2 by solvothermal synthesis for catalytic hydrodesulfurization of dibenzothiophene.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Huangcong Tang,Jiayang Dou,Zhixian He,Jingwen An,Wenhuan Liu,Sheying Dong
Heterostructured catalysts with the potential synergies between the polymetallic sulfides and the construction of 1T-phase MoS2 are a promising alternative and contribute to obtain the enhanced hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. Herein, the porous hybrid nanostructures coupling FeS2 and NiS complexes with 1T/2H phase MoS2 (FeNiSx@MoS2–HZHx) are prepared via a facile one-pot pyrolysis strategy accompanied by hydrazine hydrate (HZH)-induced phase transformation without the assistance of a template. The hybrid nanostructures possessing crystalline–amorphous (c–a) interface need overpotentials of 139 mV to achieve the current density of 10 mA cm–2 (η10) in 0.5 M H2SO4, which have superior kinetics for the HER process with a Tafel slope value of 57.9 mV dec–1. The 24 h continuous HER operated at η10 exhibits negligible deterioration, which has only a decrease of 3 mV at η10 after the 5000 cyclic voltammetry cycle tests, indicating the desirable stability of FeNiSx@MoS2–HZH2. Beyond that, the resultant FeNiSx@MoS2 requires 335 mV at η10. Specifically, the electrochemical and structural characterization prove that the enhanced HER performance is contributed from the incorporation of HZH to form FeS2/MoS2/NiS heterostructures and c–a interface sites coupling with 1T/2H phase MoS2, which provide more exposed active sites benefiting from the larger surface area. The simple and convenient design strategy has certain enlightenment for the development of sustainable energy production.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2023
·
IF 5
Jianhua Yan,Kaidi Wang,Hongjie Liu,Liwei Wang,Yixiang Li,Guoqing Zhang,Li Deng
MiRNA-155 is a typical biomarker for breast cancer. Since its low concentration in the physiological environment and the limitations of conventional miRNA detection methods like Northern imprinting and RT-qPCR, convenient, real-time, and rapid detection methods are urgently needed. In this work, an electrochemical biosensor was constructed based on the flower-like MoSe 2 @1T-MoS 2 heterojunction electrode material and specific RNA recognition probes, which can realize the rapid determination of miRNA-155 content with a wide detection range from 1 fM to 1 nM and a limit of detection (LOD) as low as 0.34 fM. Furthermore, the contents of miRNA-155 in blood samples of tumor-bearing mice and normal mice were measured as 724.93 pM and 21.42 pM, respectively by this biosensor, demonstrating its strong identification ability and miRNA-155 can be regarded as an ideal diagnostic marker. On this basis, a portable sensor platform was designed for on-site detection simulation and showed good recovery efficiency from 95.80% to 98.69%. Meanwhile, compared with the standard detection method RT-qPCR, the accuracy and reliability of the biosensor were verified, indicating that the biosensor has the potential to provide point-of-care testing (POCT) for the early diagnosis of breast cancer.
研究领域:
生物医学工程
·
分子生物学
·
癌症诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Zhe Lin,Zhengcai Guo,Xiaohong Wang,Jinchun Tu,Delun Chen,Yang Cao,Qiang Wu
MoS 2 is an attractive electrochemical sensing electrode material for the detection of biomolecule because of its adjustable band gap, large surface area, and unique electrochemical characteristics. However, the poor catalytic and electrical conductivity of the semiconductor 2H-phase MoS 2 and the phenomenon of restacking during electrochemical use hinder its sensing application. Herein, electron injection engineering is employed for the formation and stabilization of high-concentration metal 1T-phase MoS 2 nanosheets on ionic liquid-functionalized carbon nanotubes (CNTs-IL). The increase of MoS 2 concentration in the metal 1T phase significantly accelerates electron transfer kinetics. The in-situ growth method results in a tightly interfaced coupling effect, thereby substantially shortening the electron transport pathway and decreasing interfacial transmission impedance. In addition, the sulfur defects on the surface of MoS 2 as the anchoring point of sulfhydryl groups promote the enrichment of thiols on the surface of the material and reduce the reaction barrier for sulfhydryl oxidation, thereby improving the catalytic performance. The prepared CNTs-IL-MoS 2 /SPE biosensor shows excellent l -cysteine sensing performance by electrochemical detection.
研究领域:
材料科学
·
生物传感
·
电化学
✓ 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）