CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yang Gao,Kai Liu,Yingjun Wu,Caijuan Li,Qiang Lü,Guomei Zu
We report here a case of combination reaction between MoSe 2 and WSe 2 in certain proportions to improve electrochemical performance of Mo 1- x W x Se 2 compound materials. Two-dimensional (2D) Mo 1- x W x Se 2 flower-like crystals (x = 0, 0.25, 0.5, 0.75, 1) were synthesized using a solution synthesis method, and then Mo 1- x W x Se 2 -based electrodes were prepared using a powder pellet method. Their structure and electrochemical performance were respectively measured by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), scanning electron microscope (SEM), and electrochemical workstation. The results indicate that only Mo 0.25 W 0.75 Se 2 -based electrode (x = 0.75), compared with other electrodes, delivers excellent specific capacity and stability with the capacity retention of 74.4% after 5000 charging-discharging deep cycles at the current density of 2 A g −1 in 1.0 mol/L KOH aqueous electrolyte, and exhibits a Coulombic efficiency almost 100% after 5000 cycles. This phenomenon is attributed to a situation that Mo 0.25 W 0.75 Se 2 active material has a quite different electronic band structure from the other remaining materials. It is therefore concluded that the combination reaction enables Mo 1- x W x Se 2 composite materials to realize their potential in electrochemical energy storage.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Xiaoqing Yue,Jianqun Yang,Weiqi Li,Yuhang Jing,Lei Dong,Yubao Zhang,Xingji Li
Hydrogen (H2) is an environment-friendly clean energy. In recent years, novel hydrogen evolution electrocatalysts have attracted extensive attention in the scientific community. In this work, the conversion of 2H phase tungsten selenide (2H-WSe2) into 1T phase tungsten selenide (1T-WSe2) was induced by 1 MeV electron irradiation to improve its electrocatalytic performance. When the irradiation fluence is 5 × 1014 e/cm2, the minimum initial overpotential of WSe2 is 101 mV lower than the initial overpotential of WSe2 without irradiation. This method has the characteristics for a simple process and mass production. At the same time, the atomic structure of WSe2 was characterized and the 1T properties of WSe2 were confirmed. The experimental results show that 1 MeV electron irradiates WSe2 to produce Se vacancies on the base surface to form 1T-WSe2, which is the main reason for improving its performance. This effective and feasible electron irradiation method provides a new strategy for the controllable acquisition of 1T-WSe2 and a new method for other similar materials to introduce the ideal 1T phase.
研究领域:
材料科学
·
电催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ruoli Zhao,Lingxia Li,Yuxing Yan,Xiaoyan Xue,Yuxuan Huo,Tianyu Liu,Hao Wang,Changlong Liu,Shaofang Zhang,Si Sun,Xiao-Dong Zhang
Two-dimensional WSe2 has garnered significant interest owing to its special electronic properties and high catalytic activity. However, the substrate catalytic selectivity of WSe2 has still been poorly studied. In this study, ultrasmall M-WSe2 clusters (M = Cu, Ru, Zn) were designed by a single-atom doping strategy and catalytic selectivity. The Cu-WSe2 and Zn-WSe2 clusters show high antioxidant activity, both about a 7.2-fold enhancement higher than the WSe2 clusters. Meanwhile, Ru-WSe2 and Cu-WSe2 prefer to exhibit catalase-like (CAT-like) activities, about 5.6- and 2.5-fold enhancement after single-atom doping. Ru-WSe2 displays significant peroxidase-like (POD-like) activity with a better affinity than natural HRP, showing a Km value of 0.43 mM. In contrast, pure WSe2 clusters exhibit NADH oxidase-like (NOX-like) activity that catalyzes the regeneration of NAD+. Density functional theory calculations reveal that catalytic selectivity originates from differential electron transfer around different single atoms as well as d-band center modulation. In vitro cell experiments demonstrated that the M-WSe2 clusters can modulate the oxidation–reduction balance through single-atom engineering.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
iScience
·
2024
·
IF 4.6
Yi Xiao,Kai Feng,Graham Dawson,Valeri P. Tolstoy,Xingda An,Chaoran Li,Le He
Photothermal conversion represents one crucial approach for solar energy harvesting and its exploitation as a sustainable alternative to fossil fuels; however, an efficient, cost-effective, and generalized approach to enhance the photothermal conversion processes is still missing. Herein, we develop a feasible and efficient photothermal conversion strategy that achieves simultaneous light and heat management using supported metal clusters and WSe 2 interlayer toward enhanced CO 2 hydrogenation photothermal catalysis. The interlayer can simultaneously reduce heat loss in the catalytic layer and improve light absorption, leading to an 8-fold higher CO 2 conversion rate than the controls. The optical and thermal performance of WSe 2 interlayered catalysts on different substrates was quantified using Raman spectroscopy. This work demonstrates a feasible and generalized approach for effective light and heat management in solar harvesting. It also provides important design guidelines for efficient photothermal converters that facilitate the remediation of the energy and environmental crises faced by humans.
研究领域:
材料科学
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能源科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2021
·
IF 15.881
Haiyang Liu,Deyi Fu,Xu Li,Junbo Han,Xiaodie Chen,Xuefeng Wu,Baofan Sun,Weiqing Tang,Congming Ke,Yaping Wu,Zhiming Wu,Junyong Kang
Lifting the valley degeneracy in two-dimensional transition metal dichalcogenides could promote their applications in information processing. Various external regulations, including magnetic substrate, magnetic doping, electric field, and carrier doping, have been implemented to enhance the valley splitting under the magnetic field. Here, a phase engineering strategy, through modifying the intrinsic lattice structure, is proposed to enhance the valley splitting in monolayer WSe2. The valley splitting in hybrid H and T phase WSe2 is tunable by the concentration of the T phase. An obvious valley splitting of ∼4.1 meV is obtained with the T phase concentration of 31% under ±5 T magnetic fields, which corresponds to an effective Landé geff factor of −14, about 3.5-fold of that in pure H-WSe2. Comparing the temperature and magnetic field dependent polarized photoluminescence and also combining the theoretical simulations reveal the enhanced valley splitting is dominantly attributed to exchange interaction of H phase WSe2 with the local magnetic moments induced by the T phase. This finding provides a convenient solution for lifting the valley degeneracy of two-dimensional materials.
研究领域:
凝聚态物理
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材料科学
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谷电子学
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二维材料
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
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IF 3.15
Bo Yu,Binjie Zheng,Xinqiang Wang,Fei Qi,Jiarui He,Wanli Zhang,Yuanfu Chen
Reduced graphene oxide (RGO) modified few-layered WSe 2 nanosheets have been synthesized through a facile one-pot solvothermal reaction. Compared with bare WSe 2 nanosheets with relatively poor photocatalytic activity, WSe 2 /RGO composite demonstrates significant enhancement in photocatalytic degradation of organic dye RhB under visible light irradiation. The k value of WSe 2 /RGO is ∼1.9 times larger than that of bare WSe 2 nanosheets, which is attributed to the excellent charge separation feature and electronic transport ability of graphene nanosheets, leading to highly reduced electron-hole pair recombination of graphene on WSe 2 nanosheets thus strongly enhancing the photocatalytic performance. The WSe 2 /RGO composite is a promising catalyst for photocatalytic degradation of organic pollutants by solar energy.
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2022
·Vol. 9
·期 2
·2200852
·
IF 7.633
Yao Wang,Chaocheng Liu,Hengli Duan,Zhi Li,Chao Wang,Sihua Feng,Ruiqi Liu,Fengchun Hu,Hongfeng Jia,Huabin Yu,Lin Zhu,Yuran Niu,Alexei A. Zakharov,Haiding Sun,Wensheng Yan
The weak dielectric screening in 2D semiconducting transition metal dichalcogenides give rise to strongly bound quasiparticles, which provides a platform to investigate the diverse excitonic phenomena and correlated physics. However, how to effectively control these quasiparticles is still a challenge for their applications in optoelectronic and valleytronic devices. Herein, by means of fabricating monolayer WSe 2 and transition metal oxide (TMO) heterostructures, polaronic trion, that is a trion dressed with soft rotational optical (RO) phonons, is realized due to the strong interfacial coupling. This Fröhlich bound state of trion dramatically increases the trion binding energy (BE) from room temperature to 65 meV at 80 K in WSe 2 /LaAlO 3 (LAO). However, the increase of the trion BE for WSe 2 /SrTiO 3 (STO) occurs below the phase transition temperature. This work expands the possibilities of the TMDs/TMOs heterostructures and promotes the development of 2D van der Waals materials for quasiparticle-based devices.
研究领域:
凝聚态物理
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二维材料
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光电子学
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谷电子学
·
量子材料
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 17
·期 1
·2200416
·
IF 10.947
Haiyang Liu,Xuanli Zheng,Gaohong Liu,Jun Yin,Congming Ke,Weihuang Yang,Yaping Wu,Zhiming Wu,Xu Li,Chunmiao Zhang,Feiya Xu,Junyong Kang
Two unequal K and K' valleys in transition metal dichalcogenides (TMDC) enable large and controllable polarization, which is the cornerstone of emerging valleytronic applications. Here, a phase engineering strategy aided by resonant plasmonic coupling is proposed to manipulate the valley degree of freedom. Compared with the pristine WSe 2 monolayer, the hybrid H/T phase WSe 2 exhibits an enhanced degrees of circular polarization (DCP) and valley polarization (DVP). As further aided by the designed Au plasmonic array, the T phase facilitates the excitons process and promotes the charge transfer in WSe 2 /Au interface under the plasmonic-enhanced electromagnetic field. Consequently, both the DCP and DVP values are considerably enhanced to 38.5% (15.6%) and 15.1% (7.6%) at 13 K (room temperature), respectively. Through finite difference time domain simulations (FDTD), the near-field excitation, exciton decay, and far-field detection processes are systematically analyzed, and highly consistent polarizations are quantitatively achieved between the theoretical and the experimental results. Accordingly, the high polarizations are revealed to be contributed by the increased exciton generation and radiation efficiency, chiral electromagnetic field, and non-equilibrium spin distribution in the hybrid phase. The research presented here illustrates a promising route to control the spin and valley degrees of freedom in TMDC materials.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jun Wan,Baihong An,Zhibeng Chen,Jingwei Zhang,William W. Yu
Nitrogen doped graphene oxide (NG) modified WSe 2 nanorod composites (WSe 2 /NG) were prepared by a hydrothermal synthesis route. The synthesized samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy(DRS) and elemental analysis . Using methylene blue (MB) as a target organic dye, WSe 2 /NG nanocomposites exhibited significant enhancement in photocatalytic degradation of MB under visible light irradiation compared with WSe 2 . That was mainly attributed to the strong adsorption of MB, excellent electrical conductivity and charge separation features of the NG, leading to effectively restrained electron-hole pair recombination of WSe 2 nanorods. Among the hybrid photocatalysts , WSe 2 /50NG (50 wt% of NG) exhibited the highest photocatalytic activity with a rate constant of 0.0572 min −1 for the degradation of the MB in aqueous solution under visible light irradiation, and the removal efficiency reached 99.3% which was 2.4 times higher than that of WSe 2 . In addition, WSe 2 /NG also showed higher stability and good reusability.
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
ADVANCED MATERIALS
·
2021
·Vol. 34
·期 3
·2106502
·
IF 30.849
Jia-Xin Yu,Shuai Xing,Guang-Yu Dai,Shuang-Yi Ling-Hu,Fu-Xing Gu
Monolayer transition metal dichalcogenides (TMDs) have emerged as widely accepted 2D gain materials in the field of light sources owing to their direct bandgap and high photoluminescence quantum yield. However, the monolayer medium suffers from weak emission because only a single layer of molecules can absorb the pump energy. Moreover, the material degradation when transferring these fragile materials hinders their cooperation with the optical cavity further. In this study, for the first time, a high-quality monolithic structure is developed by directly growing single-domain tungsten diselenide (WSe 2 ) bilayers on single silica microsphere (MS) cavities. Such a completely wrapped structure guides the indirect-to-direct bandgap transition of WSe 2 bilayers, leading to a significantly improved photoluminescence intensity by about 60-fold. Moreover, the high-quality monolithic structure enhances the confinement factor of the cavity by more than 20-fold. Based on the above advantages, a bilayer WSe 2 /MS microlaser is realized with an ultralow threshold of 0.72 W cm −2 , nearly an order of magnitude lower than the existing records. The results demonstrate the possibility of using multilayer TMD materials as 2D gain media and provide insights into a new ultracompact monolithic platform of TMD material/cavity for lasing devices.
研究领域:
光学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 8
·1605-1612
·
IF 2.747
Hu Jie,Li Jingying,Wei Zhengnan,Zhang Shuying
“Rocking-chair” zinc-ion batteries (ZIBs) are potential commercial energy storage devices because of their high energy density and safety. However, using appropriate cathode materials with weak polarization effect and tolerating the rapid insertion/extraction of zinc ions are still the huge challenges. Here, a WSe 2 nano-flower cathode material with hierarchical structure is successfully prepared by a facile solvent thermal strategy. The electrochemical data confirm that the WSe 2 cathode has high specific discharge capacity (545 mA h g −1 at 0.1 A g −1 ), excellent rate performance, and stable cyclic performance (81% after 100 cycles), which are superior to most reported electrode materials. The layered structure is beneficial to increase the specific surface area and conductivity of the electrode material and improve the battery discharge performance. This study opens new opportunities to promote the commercialization of rechargeable aqueous ZIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haonan Wang,Pengtao Wang,Kaifeng Yu,Xiaofeng Wang,Jinpeng Cao,Pengcheng Jia,Yongzhi Yuan,Ce Liang
Rechargeable Aqueous Zinc-Ion Batteries (AZIBs) have attracted significant attention in recent years due to their high energy density, safety, and cost-effectiveness. However, despite these advantages, AZIBs face challenges such as anode side reactions, passivation, corrosion, hydrogen evolution, and the growth of zinc dendrites, which hinder their widespread use. To address these issues, this study involves the creation of a zinc-affinitive coating using a WSe 2 /ZIF composite on zinc foils. The amorphous WSe 2 protective layer, formed through electrochemical induction as ZnSe, enhances the anode's zinc affinity, accelerates Zn 2+ transfer at the interface, and effectively inhibits zinc dendrite growth. Additionally, the coating improves electrolyte wettability, reducing interface resistance. Compared to pure zinc, anodes with a WSe 2 /ZIF protective layer exhibit excellent performance in both symmetric cells and full-cell systems using MXene/MnO 2 as the cathode. Symmetric cells can cycle for over 1000 h at a current density of 5 mA/cm 2 , and the full cell maintains a capacity retention of 91.4 % after 2000 charge-discharge cycles. This interface engineering strategy, supported by density functional theory calculations, provides a strong foundation for practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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