Advanced Materials Interfaces
·
2022
·Vol. 9
·期 9
·2102091
·
IF 6.389
Chaocheng Fang,Jianfu Han,Ming Yu,Wenliang Liu,Shengmei Gao,Kai Huang
2D bismuth oxyselenide (Bi 2 O 2 Se) nanosheets have received increasing attention in the field of electronics and optoelectronics due to their high-mobility, moderate energy bandgap, and air-stability. However, due to the intrinsic high mobility, the photodetectors based on 2D Bi 2 O 2 Se have an inevitable high dark current, leading to high power consumption and limiting its potential application in photodetection. Herein, a novel highly sensitive WS 2 /Bi 2 O 2 Se van der Walls (vdWs) heterostructure with straddling band configuration is assembled on fluorophlogopite substrate. Owing to the effective separation of photogenerated electron–hole pairs and the quantum tunneling effect, the responsivity and external quantum efficiency of the WS 2 /Bi 2 O 2 Se heterostructure are 628 mA W −1 and 147.6% under 532 nm illumination, respectively. The I photo / I dark ratio with more than two orders of magnitude can be obtained, and the rise time is ≈33 ms, while the fall time is 38 ms. Furthermore, the heterostructure achieves a broadband photodetection capability from visible to near infrared (532–1450 nm). The results suggest that the WS 2 /Bi 2 O 2 Se vdWs heterostructure possesses a promising potential application prospect in high performance and broadband photodetectors.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Shengjia Ma,Bingtao Dong,Yuxin Zheng,Shuai Tang,Tao Zhang,Yaping Zhao
This work elucidated the dual-substrate activation mechanism of a Fenton-like system, enabled by the upcycling of plastics into a highly efficient catalyst. A synergistic pyrolysis strategy was employed to upcycle polyethylene microplastics into nitrogen-doped carbon while simultaneously constructing Fe clusters and WS 2 co-catalyst (WS 2 /Fe-N-C). In the H 2 O 2 activation system, WS 2 /Fe-N-C achieved a remarkable rate constant of 0.949 min −1 toward bisphenol A, which was 52 times higher than that of Fe-N-C, outperforming previously reported representative co-catalyst systems and Fe-based carbon catalysts. Correlation analysis, electrochemical tests and theoretical calculations demonstrated that Fe sites primarily activated H 2 O 2 to generate •OH, while WS 2 adsorbed bisphenol A and facilitated a non-radical electron transfer pathway, enabling dual-substrate synergistic catalysis for highly efficient pollutant removal. This work provides a feasible strategy for plastic upcycling and offers innovative insights into the synergy between metal centers and cocatalysts, paving the way for the rational design of high-performance catalysts.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jintao Zhao,Liang Li,He Jiang,Huaibao Tang,Dongmeng Chen,Jixin Yao,Feng Du,Guang Li
The development of an efficient and durable non-precious electrocatalyst for alkaline seawater electrolysis is of great significance. Herein, two-dimensional (2D) lamellar heterostructure WS 2 /WN was dispersed on the carbon matrix (marked as WS 2 /WN@CM). The obtained WS 2 /WN@CM catalysts demonstrate exceptional performance in the hydrogen evolution reaction (HER) in alkaline freshwater (1.0 M KOH), alkaline simulated seawater (1.0 M KOH + 0.5 M NaCl) and alkaline natural seawater (1.0 M KOH + seawater), respectively, which achieved a low overpotential (92 mV, 95 mV and 113 mV) at 10 mA cm −2 and outstanding long-term durability at 200 mA cm −2 for 100 h. The catalyst benefits from the 3D carbon skeleton, which not only effectively prevents stacking of the 2D lamellar WS 2 /WN to fully utilize the active material, but also provides rapid electron transport. Moreover, stress effects at WS 2 /WN interfaces lead to distortions of torsion angles in the WS 2 lattice, thereby increasing crystal surface defects accompanied by an enhancement of electrical conductivity. Density functional theory (DFT) calculations combined with XPS evidence confirm the electronic structure reorganization of WS 2 /WN at interfaces, which optimizes the adsorption energy of specific intermediates. Additionally, WN captures many electrons from WS 2 , so the WN region favors the reduction reaction and thus enhances the HER process.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Science Bulletin
·
2019
·
IF 6.277
Deqing Zhang,Yingfei Xiong,Junye Cheng,Jixing Chai,Tingting Liu,Xuewei Ba,Sana Ullah,Guangping Zheng,Ming Yan,Maosheng Cao
WS 2 nanomaterials have attracted great attention in the field of electromagnetic wave absorption due to their high specific surface area, layered structure, and peculiar electronic properties. However, further improvements on their limited electromagnetic absorbing (EMA) capacity and bandwidth are urgently required for their practical application as EMA absorbents. In this work, WS 2 /NiO hybrids with heterostructures are prepared by a hydrothermal method and developed into EMA absorbents. The maximum reflection loss of the hybrids with 20% NiO loading could reach −53.31 dB at a thickness of 4.30 mm; the bandwidth with a reflection loss value of less than −10 dB is determined to be 13.46 GHz (4.54–18 GHz) when the thickness of the absorbent is between 3.5 and 5.5 mm. It is found that the enhanced EMA performance of WS 2 /NiO hybrids is caused by the addition of magnetic NiO, which could result in the interfaces between WS 2 and NiO being responsible for the synergetic magnetic loss and dielectric loss in the hybrids. This work provides a new approach for the design of excellent EMA materials for practical applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Nanotechnology
·
2022
·Vol. 17
·期 11
·1178-1182
·
IF 40.523
Chen Yang,Qian Shuhang,Wang Kai,Xing Xiangyuan,Wee Andrew,Loh Kian Ping,Wang Bing,Wu Dong,Chu Jiaru,Alu Andrea,Lu Peixiang,Qiu Cheng-Wei
Valleytronics is a promising candidate to address low-energy signal transport on chip, leveraging the valley pseudospin of electrons as a new degree of freedom to encode, process and store information 1 , 2 , 3 , 4 , 5 , 6 , 7 . However, valley-carrier nanocircuitry is still elusive, because it essentially requires valley transport that overcomes three simultaneous challenges: high fidelity, high directionality and room-temperature operation. Here we experimentally demonstrate a nanophotonic circuit that can route valley indices of a WS 2 monolayer unidirectionally via the chirality of photons. Two propagating modes are supported in the gap area of the circuit and interfere with each other to generate beating patterns, which exhibit complementary profiles for circular dipoles of different handedness. Based on the spin-dependent beating patterns, we showcase valley fidelity of chiral photons up to 98%, and the circulation directionality is measured to be 0.44 ± 0.04 at room temperature. The proposed nanocircuit can not only enable the construction of large-scale valleytronic networks but also serve as an interactive interface to integrate valleytronics 3 , 4 , 5 , spintronics 8 , 9 , 10 and integrated photonics 11 , 12 , 13 , opening new possibilities for hybrid spin-valley-photon ecosystems at the nanoscale.
研究领域:
光子学
·
纳米技术
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材料科学
·
量子信息科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Temitope Fausat Ajibade,Huali Tian,Kayode Hassan Lasisi,Kaisong Zhang
The use of membrane filtration for saline oily wastewater separation remains challenging for industry application despite the progress in membrane technology. The use of two-dimensional (2D) nanoparticles is well known for improving membrane properties, yet they are still vulnerable to fouling and operational inconsistencies. In providing solutions, bio-inspired PDA@WS 2 PAN UF membrane was fabricated with tailored molecular weight cutoff (MWCO) and excellent selectivity for effective removal of oil and dye in a saline environment. At high salinity, the modified membrane with the lowest MWCO of 5308.53 Da and Stokes diameter of 2.17 nm showed sufficient separation of oil and dye of about 99.53% and 98.23% respectively. Concurrently sustaining high water permeability of 58.57 L m −2 h −1 with free transport of monovalent and divalent salts. Moreover, due to the synergistic effect of the adhesive PDA with WS 2 nanosheet and PAN, the modified membrane displayed outstanding oil repellency and antifouling properties of about 98.6%. Furthermore, excellent thermal stability between the temperature of 100–900 °C, and pressure stability ranging from 1 bar to 6 bar of the modified membranes was reported. Overall, the operational stability of the modified membrane was sustained with high removal of oil and dye, and permeation of salt over a 90 h long-term operation. Consequently, this study demonstrates the potential application of bio-inspired PDA@WS 2 PAN membrane for the treatment of saline oily wastewater.
研究领域:
环境科学
·
材料科学
·
膜技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zelin Chen,Keyu Guo,Fengguo Yan,Daohu Sheng,Siyao Cheng,Weiqiang Wang,Ruru Gao,Weijin Li,Aming Xie
Interfacial polarization has been proved to significantly contribute to the effective absorption of electromagnetic waves (EMW). However, a model that clearly defines the contribution of interfacial polarization has yet to be developed. In this work, a layer of WO 3 was introduced within the WS 2 /PPy nanocomposites by oxidation to create a heterojunction interface, resulting in the formation of a WS 2 /WO 3 /PPy nanocomposite material. The experiments demonstrated that interfacial engineering could significantly enhance the electromagnetic wave absorption capability of the material. The WS 2 /WO 3 /PPy composite achieved a minimum reflection loss (RL min ) of −58.87 dB at a thickness of 3.3 mm and an effective absorption bandwidth (EAB) of 6.72 GHz at a thickness of 2.3 mm. This work clarifies the impact of interfacial polarization on EMW absorption, providing a feasible approach for designing novel, high-efficiency EMW absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 8
·期 1
·201-209
·
IF 5.773
Peiyuan Xiao,Jufeng Lou,Huixian Zhang,Weili Song,Xi-Lin Wu,Hongjun Lin,Jianrong Chen,Shoujie Liu,Xiangke Wang
Quantum dots (QDs) derived from two-dimensional (2D) nanosheets (NSs), especially ultrathin transition metal dichalcogenide (TMD, e.g. WS2, WSe2, MoS2, MoSe2) NSs, have attracted great attention due to their broad band absorption and high charge mobility. Herein, WS2 QDs, one of the emerging extraordinary zero-dimensional (0D) TMD materials, were applied to the preparation of novel 0D/2D heterojunctions of WS2 QDs/BiOCl nanosheets. The obtained WS2/BiOCl composites exhibited significantly enhanced visible-light-driven photocatalytic activity as compared with pure BiOCl. The results indicated that the holes (h+) and O2˙− are the main active species generated by the catalysts under visible light irradiation. The enhanced photocatalytic performance could be due to the broad band absorption and up-conversion properties of the WS2 QDs as well as the band alignment and the strong coupling between the WS2 QDs and BiOCl NSs, leading to a broadened light absorption range and enhanced efficiency for electron–hole pair production and separation. These findings offer exciting opportunities using the extraordinary 2D TMD material-derived quantum dots for the fabrication of novel 0D/2D composites and may provide new insights into the application of the novel 0D/2D composites in catalysis.
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
ACS Applied Nano Materials
·
2023
·
IF 5.9
Huanhuan Sun,Hongyan Yu,Boyang Han,Junjie Ma,Rensheng Wang,Yanping Song
Pressure-induced surface-enhanced Raman spectroscopy (PI-SERS) is among the foremost achievements of high-pressure fields, benefiting from the advantage that pressure-modulated interactions between substrates and molecules overcome the weakness of individual substrates or molecules. However, the pressure corresponding to PI-SERS enhancement is currently still at a low-pressure stage within 8 GPa. Therefore, how to realize PI-SERS enhancement under higher or ultrahigh pressure remains a huge challenge. Here, we applied few-layer WS2 (FL-WS2) nanosheets as PI-SERS substrates and selected 4-mercaptobenzoic acid (4-MBA) molecules with a big energy gap as probes to explore PI-SERS enhancement in more depth. The experimental results indicate that the PI-SERS signals increase gradually as pressure increases and reaches a maximum at 18 GPa, which has set a pressure record for the PI-SERS field so far. Different from the C exciton resonance-induced SERS intensities at ambient conditions, the charge-transfer transition between FL-WS2 and 4-MBA is strengthened via the pressure-induced increase in the band gap of FL-WS2 and decrease in the highest-occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) energy gap of 4-MBA, thus enhancing PI-SERS signals accordingly. Therefore, this strategy will be beneficial for practical applications in the field of optoelectronics and for the design of other PI-SERS sensors for trace detection in complex and extreme environments.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ge Gou,Shurui Kang,Hailing Zhao,Chao Liu,Naiwen Li,Bo Lai,Jun Li
In this study, carbamazepine (CBZ) degradation was evaluated by peroxymonosulfate (PMS) activation after the simultaneous introduction of FeS 2 and WS 2 . For FeS 2 /WS 2 /PMS system, 99% of CBZ was removed within 40 min under the conditions of 100 mg/L FeS 2 , 150 mg/L WS 2 , 0.2 mM PMS, and initial pH 6.7. The apparent rate constant ( k obs ) of CBZ degradation in the FeS 2 /WS 2 /PMS system (0.108 min −1 ) was about 3.0- and 13.5-folds of that in FeS 2 /PMS system (0.036 min −1 ) and WS 2 /PMS system (0.008 min −1 ). Quenching experiments and electron paramagnetic resonance (EPR) experiments indicated that hydroxyl radical, sulfate radical , superoxide radical, and singlet oxygen participated in the CBZ degradation. The catalytic reaction mechanism was proposed, and W on the surface of WS 2 was the main reactive site to accelerate the regeneration of Fe(II) in the FeS 2 , which played a dominant role in PMS activation. The degradation pathways of CBZ in the FeS 2 /WS 2 /PMS system were put forward, and the ecotoxicity of CBZ and its degradation by-products was evaluated. A distinguishing performance of CBZ degradation in the successive six runs was shown. The work indicated the FeS 2 /WS 2 /PMS system was an efficient advanced oxidation process with promising engineering application due to its simple operation, high efficiency, and stability for the degradation of the organics from water.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Xiaodan Zhao,Jiahui Wei,Ying Wu,Zuoming Zhou,Guohua Jing
Sulfite autoxidation in combination with the cobalt-based heterogeneous activators, has recently emerged as the efficient sulfate radical (SO 4 •− ) generation process for organic micropollutant abatement in the water and wastewater treatment , yet the sluggish >Co(II)/Co(III) redox cycling currently compromises the efficacy of radical generation and the potential applications. Herein, regarding that the reductive W(IV) species in WS 2 can modulate the >Co(II)/Co(III) redox cycling in the advanced oxidation processes , confinement of cobalt with WS 2 (Co-WS 2 ) is designed and characterized. The Co-WS 2 /sulfite process achieves an ultrafast tetracycline (TC) abatement (∼100 % abatement of TC within 1 min) under circumneutral conditions with lower dosage of sulfite and activator, outperforming the current cobalt-based heterogeneous counterparts. The dominant reactive radicals are identified as SO 4 •− and hydroxyl radical (HO • ), which are quantified to be 9.7 μM and 4.5 μM, respectively. The superior radical generation efficiency and the concomitant TC abatement rely on the excellent redox properties and electron transfer capability of Co-WS 2 . The inter-transformation of >Co(II)/>Co(III) can be accelerated via the involvement of the reductive W(IV) species with the redox-reversibility of the W(IV)/W(VI) couple in the presence of sulfite. The TC degradation intermediates and the corresponding pathways are also proposed according to the ultra-performance liquid chromatography and quadrupole-time of flight mass spectrometry (UPLC-QTOF-MS) analysis. In addition, the influences of the reactant dosage, coexisting anions (HCO 3 − , HPO 4 2− , Cl − and NO 3 − ), humic acid and the various real water matrices on TC abatement are thoroughly explored. Especially, the Co-WS 2 /sulfite process is advantageous owing to the negligible effect of the coexisting anions on the TC abatement. This study provides a novel heterogeneous activator for significantly improving sulfite activation efficacy to achieve the efficient organic micropollutant abatement.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Liangbin Xia,Kunming Pan,Haitao Wu,Fang Wang,Ni Zhao,Hua Yu,Yongpeng Ren,Meijia Chang,Zhili Dong,Shizhong Wei
Rational designing of a WS 2 -based hybrid material is extremely important to resolve low-edge sites and poor conductivity of bare WS 2 , but it is still challenging to construct applicable structures. In this study, an electrocatalyst with ultra-thin WS 2 nanosheets homogeneously decorated on Co–N-co-doped carbon hollow nanocages (WS 2 -3/Co–N–CN-750) is developed, which has favorable hydrogen evolution reaction (HER) activity and stability. The performance of WS 2 -3/Co–N–CN-750 is significantly improved due to the collective synergy of the specific micro-morphology, interfacial structure, and electronic property. The hybridization of WS 2 and Co 9 S 8 can optimize the electronic structure, reduce hydrogen adsorption energy, slash the decomposition barrier of H 2 O, and accelerate the electron transfer to WS 2 . Furthermore, the marginal sites of WS 2 are significantly increased by optimizing the aggregation growth of WS 2 . Besides, the precipitation of appropriate Co particles and the Co-based metal-organic framework (Co-MOF) lay a solid foundation for the favorable conductivity of the hybrid material. However, samples after stability tests reveal that cobalt sulfide is corroded and transformed in a locally strong alkali condition. This study highlights the synergies of multicomponent hybridization and provides insights into the stability of congeneric materials.
研究领域:
材料科学
·
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）