CARBON
·
2023
·
IF 10.9
Meng Ma,Qi Zheng,Xinci Zhang,Lin Li,Maosheng Cao
Electromagnetic radiation pollution has become a serious threat, which will harm human health and interfere with electronic devices. However, it is still a challenge to develop high-efficiency electromagnetic wave absorbers with wide frequency band and strong absorption, especially for realizing the features of multi-bands absorption. Herein, VSe 2 /CNTs nanocomposites were successfully synthesized with crosslinked CNTs distributed on VSe 2 nanoclusters composed of nanosheets . Importantly, the electromagnetic properties and absorption performance of the VSe 2 /CNTs nanocomposites can be effectively tailored by changing the hybrid ratio of CNTs and VSe 2 nanosheets (VSe 2 -NSs). The increase of CNTs content promotes the formation of a conductive network and leads to the increase of permittivity. The VSe 2 /CNTs nanocomposite with CNTs of 40 mg exhibits the best electromagnetic wave absorption performance, the minimum reflection loss ( RL ) reaches −57.53 dB at 5.52 GHz and is about 6 times more than VSe 2 -NSs. Meanwhile, the VSe 2 /CNTs nanocomposite with CNTs of 30 mg shows dual-bands absorption performance with a minimum RL value of −50.06 dB at 3.84 GHz and the total effective absorption bandwidth of 3.32 GHz. This result proves that VSe 2 /CNTs nanocomposites can be promising candidates as high-efficiency electromagnetic wave absorption material and provides a feasible idea for designing a high-performance electromagnetic wave absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Youcun Bai,Heng Zhang,Bin Xiang,Xinyue Liang,Jiangyu Hao,Chong Zhu,Lijin Yan
As a typical transition-metal dichalcogenides, vanadium diselenide (VSe2) is a promising electrode material for aqueous zinc-ion batteries due to its metallic characteristics and excellent electronic conductivity. In this work, we propose a strategy of hydrothermal reduction synthesis of stainless-steel (SS)-supported VSe2 nanosheets with defect (VSe2–x-SS), thereby further improving the conductivity and activity of VSe2–x-SS. Density functional theory calculations confirmed that Se defect can adjust the adsorption energy of Zn2+ ions. This means that the adsorption/desorption process of Zn2+ ions on VSe2–x-SS is more reversible than that on pure SS-supported VSe2 (VSe2-SS). As a result, the Zn//VSe2–x-SS battery showed more excellent electrochemical performance than Zn//VSe2-SS. The VSe2–x-SS electrode shows a good specific capacity of 265.2 mA h g–1 (0.2 A g–1 after 150 cycles), satisfactory rate performance, and impressive cyclic stability. In addition, we also have explored the energy-storage mechanism of Zn2+ ions in this VSe2–x-SS electrode material. This study provides an effective strategy for the rational design of electrode materials for electrochemical energy-storage devices.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jean Pierre Mwizerwa,Changyong Liu,Kun Xu,Ning Zhao,Zhangwei Chen,Jun Shen
Surface engineering of transition metal oxide cathode materials for Li-ion batteries is highly important to achieve high-capacity retention, high-rate capability, and long-life term. In this study, VSe 2 nanosheets are prepared and used as a surface sensitizer to enhance the electrochemical properties of LiFePO 4 (LFP) cathode material. The LiFePO 4 @VSe 2 (LFP@VSe 2 ) composite is formed by anchoring 1D-LFP particles with the as-prepared 2D-VSe 2 nanosheets by using an in-situ solution phase technique. When the LFP@VSe 2 composites are used as cathode materials for Li-ion batteries, the Li surface-controlled storage behavior of the batteries is reasonably enhanced. The performance is attributed to the improvement in the inherent Li-ion conductivity of LFP particles, thereby inhibiting surface diffusion drawbacks and decreasing charge transfer resistance. The exterior VSe 2 attached to the LFP serves as a second electrically conducting layer to increase conductivity into the entire electrode. Thus, these conditions enhance the electron transfer kinetics and surface stability of the LFP cathode. LFP@VSe 2 composite cathode exhibits an ultrastable specific capacity of 166.5 mAh g −1 after 100 cycles @ 0.1 C and can retain a specific capacity of 146.7 and 46.5 mAh g −1 after 700 and 2000 cycles respectively at a current rate of 0.3 C and 10 C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 15
·2211311
·
IF 29.4
Dawei Sha,Yurong You,Rongxiang Hu,Xin Cao,Yicheng Wei,Heng Zhang,Long Pan,ZhengMing Sun
Anion vacancy engineering (AVE) is widely used to improve the Li-ion and Na-ion storage of conversion-type anode materials. However, AVE is still an emerging strategy in K-ion batteries, which are promising for large-scale energy storage. In addition, the role of anion vacancies on ion storage is far from clear, despite several proposed explanations. Herein, by employing VSe 2 as a model conversion-type anode material, Se vacancies are intentionally introduced (labeled as P-VSe 2− x ) to investigate their effect on K + storage. The P-VSe 2− x shows excellent cyclability in half cells (143 mA h g −1 at 3.0 A g −1 after 1000 cycles) and high energy density in coin-type full cells (206.8 Wh kg −1 ). By applying various electrochemical techniques, the effects of Se vacancies on the redox potentials of K-ion insertion/extraction and the K-ion diffusion in electrodes upon cycling are uncovered. In addition, the structural evolution of Se vacancies during potassiation/de-potassiation using various operando and ex characterizations is revealed. Moreover, it is demonstrated that Se vacancies can facilitate the breaking of V Se bonds upon the P-VSe 2− x conversion using theoretical calculations. This work comprehensively explains the role of anion vacancies in ion storage for developing high-performance conversion-type anode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
J.P. Mwizerwa,K. Xu,C. Liu,N. Zhao,Y. Li,P. Ndagijimana,Z. Chen,J. Shen
Currently, the development of high-performance lithium-ion batteries (LIBs) with improved areal capacity is still challenging. The common strategy to improve areal capacity is to increase the thickness of electrode materials. However, the application of thick electrodes remains challenge due to poor mechanical properties , slow charge and ion transport, and poor electrolyte infiltration . In this study, thick electrodes are constructed by 3D printing a Li 4 Ti 5 O 12 @VSe 2 -based ink. The highly electrical conductor VSe 2 on the Li 4 Ti 5 O 12 surface improves the ion and charge transport and eases the internal resistance of the 3D-printed electrode during charge and discharge. As a result, LIBs employing these thick electrodes show a high-rate capability of 128.9 mAh/g at 10 C, improved areal capacities up to 6.2 mAh/cm 2 , and ultrastable cycling capability (84.5% of capacity retention after 1700 cycles). Moreover, full cells utilizing 3D-Li 4 Ti 5 O 12 @VSe 2 as the anode and 3D-LiFePO 4 @AC/rGO as the cathode with 1.81 V potential yield a high specific capacity of 152.5 mAh/g at 0.1C, a high specific energy density of 276.025 Wh/kg, and a power density of 30.5 W/kg at 0.1C. This work paves the way to designing thick electrodes for high-performance LIBs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 47
·2204557
·
IF 15.153
Jian Zhang,Jiandong Li,Huajie Huang,Wei Chen,Yan Cui,Yonghua Li,Weiwei Mao,Xinbao Zhu,Xing'ao Li
Defect engineering of transition metal dichalcogenides (TMDCs) is important for improving electrocatalytic hydrogen evolution reaction (HER) performance. Herein, a facile and scalable atomic-level di-defect strategy over thermodynamically stable VSe 2 nanoflakes, yielding attractive improvements in the electrocatalytic HER performance over a wide electrolyte pH range is reported. The di-defect configuration with controllable spatial relation between single-atom (SA) V defects and single Se vacancy defects effectively triggers the electrocatalytic HER activity of the inert VSe 2 basal plane. When employed as a cathode, this di-defects decorated VSe 2 electrocatalyst requires overpotentials of 67.2, 72.3, and 122.3 mV to reach a HER current density of 10 mA cm −2 under acidic, alkaline, and neutral conditions, respectively, which are superior to most previously reported non-noble metal HER electrocatalysts. Theoretical calculations reveal that the reactive microenvironment consists of two adjacent SA Mo atoms with two surrounding symmetric Se vacancies, yielding optimal water dissociation and hydrogen desorption kinetics. This study provides a scalable strategy for improving the electrocatalytic activity of other TMDCs with inert atoms in the basal plane.
研究领域:
材料科学
·
电催化
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xing Qian,Hao Yu,Wenbin Chen,Jianhua Wu,Juan Xia,Ming Chen,Yonglian Xiong,Xiancai Jiang
Among the various non-precious metal catalysts that drive hydrogen evolution reactions (HERs) and dye-sensitized solar cells (DSSCs), transition metal selenides (TMSs) stand out due to their unique electronic properties and tunable morphology. Herein, the multicomponent selenide CuSe-Co 3 Se 4 @VSe 2 was successfully synthesized by doping with metal element vanadium and selenization on the copper-cobalt carbonate hydroxide (CuCo-CH) template. CuSe-Co 3 Se 4 @VSe 2 exhibited the dandelion-like cluster structure composed of hollow nanotubes doped with VSe 2 nanoparticles. Due to the unique structure and the synergistic effect of various elements, CuSe-Co 3 Se 4 @VSe 2 showed excellent alkaline HER and DSSC performances. The DSSC based on CuSe-Co 3 Se 4 @VSe 2 exhibited an impressive power conversion efficiency (PCE) of 9.64 %, which was much higher than that of Pt (8.39 %). Besides, it possessed a low HER overpotential of 76 mV@10 mA cm −2 and a small Tafel slope of 88.9 mV dec −1 in 1.0 M KOH.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE COMMUNICATIONS
·
2020
·
IF 1.521
Shouling Wang,Ronghua Wang,Lili Wang,Jie Chang
Transition metal dichalcogenides (TMDs) with layered structures possess excellent electrical and thermal transport properties. In this work, bulk VSe 2 sample with layered structure was fabricated by a conventional solid-state reaction method followed with spark plasma sintering process. The microstructure as well as thermoelectric properties were systematically studied. Bulk VSe 2 possesses high electrical conductivity but relatively low Seebeck coefficient , and sample along the direction parallel to the pressing axis has a lower thermal conductivity . The maximum ZT value of 0.023 was obtained at 700 K for sample along the direction parallel to the pressing axis.
研究领域:
材料科学
·
热电学
·
无机化学
·
固体物理
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2022
·Vol. 8
·期 7
·2101383
·
IF 7.633
Changsheng Zhu,Bin Lei,Fanbao Meng,Jianhua Cui,Weizhuang Zhuo,Wenxiang Wang,Ziji Xiang,Xianhui Chen
Ferromagnetic order in 2D2D materials has triggered widespread interest because of their applications in spintronic devices. Monolayer 1T-VSe 2 , as a recently emerged candidate of 2D2D ferromagnetic material, exhibits complicated behaviors that contradict the theoretical predictions. In this work, a systematic investigation is presented on the evolution of the transport properties in VSe 2 thin flakes controlled by gate voltage. Notably, for the first time, a paramagnetic-to-ferromagnetic transition is realized in a VSe 2 thin flake using a field-effect transistor setup with solid ion conductor of polycrystalline Li 1+ x + y Al x (Ti 2− y Ge y )P 3− z Si z O 12 serving as the gate dielectric. The Curie temperature determined from the electrical transport measurements is ≈40 K. The electric-field-controlled ferromagnetism in exfoliated VSe 2 flakes provides an excellent platform for developing advanced spintronics as well as investigating unusual emergent physics in 2D systems.
研究领域:
凝聚态物理
·
材料科学
·
纳米电子学
·
自旋电子学
·
低维系统
✓ 已验证
DOI
高影响因子
PHYSICAL REVIEW B
·
2020
·Vol. 102
·期 16
·165410
·
IF 3.575
F. B. Meng,Z. Liu,L. X. Yang,M. Z. Shi,B. H. Ge,H. Zhang,J. J. Ying,Z. F. Wang,Z. Y. Wang,T. Wu,X. H. Chen
The charge-density wave (CDW) transition has been extensively studied in transition metal dichalcogenides (TMDs), the underlying mechanism and the related metal-insulator transition are not as simple as Peierls instability in one dimension and still under hot debate. Here, through electrochemical intercalation of organic ions, we have observed a dimensional crossover induced metal-insulator transition in an organic ion intercalated TMDs: ${(\mathrm{TBA})}_{0.3}{\mathrm{VSe}}_{2}$. In pristine ${\mathrm{VSe}}_{2}$, previous studies have revealed a three-dimensional CDW transition at ${T}_{\mathrm{CDW}}\ensuremath{\sim}110\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ with a metallic ground state. After intercalation of organic ions, the remarkable anisotropy of resistivity indicates a highly two-dimensional electronic state in ${(\mathrm{TBA})}_{0.3}{\mathrm{VSe}}_{2}$, which is consistent with our density functional theory (DFT) calculation. Interestingly, the dimensional crossover enhances the CDW transition with ${T}_{\mathrm{CDW}}$ of 165 K and leads to an insulating ground state in ${(\mathrm{TBA})}_{0.3}{\mathrm{VSe}}_{2}$. Moreover, a commensurate superstructure with $3a\ifmmode\times\else\texttimes\fi{}3a$ periodicity is also confirmed in this insulating CDW state. Although the DFT calculation suggests that the commensurate superstructure and the enhanced CDW temperature could be ascribed to the improved Fermi surface nesting, whether the metal-insulator transition is driven by a perfect Fermi surface nesting is still elusive at the present stage. The possible role of electronic correlation and electron-phonon coupling has also been discussed. Our work provides a different material platform to study the metal-insulator transition in TMDs.
✓ 已验证
DOI
高影响因子
Science China-Information Sciences
·
2019
·Vol. 62
·期 12
·1-8
·
IF 2.731
Wang Tao,Shi Xinyao,Wang Jin,Xu Yijun,Chen Jie,Dong Zhuo,Jiang Man,Ma Pengfei,Su Rongtao,Ma Yanxing,Wu Jian,Zhang Kai,Zhou Pu
Vanadium diselenide (VSe 2 ), a typical metallic behaviour material among transition metal dichalcogenides (TMDCs) family, exhibits excellent photoelectric characteristics with a zero band gap, missing applicaiotn in pulse generation. In this work, a high-quality VSe 2 saturable absorber (SA) was synthesized through a liquid-phase exfoliation method. The saturable absorption of obtained VSe 2 -SA was characterized systematically. The measured modulation depth was 9.9%, and the saturated intensity was 533.8 µJ/cm 2 . By incorporating this optical modulator into a ytterbium-doped fiber laser cavity, a stable passively Q-switched laser could be achieved. The pulse had the central wavelength of 1064.03 nm. As the pump power was increased, the repetition rate increased from 24.3 kHz to 35.6 kHz, and the pulse duration decreased from 7.21 µs to 5.27 µs. The output power had the maximum value of 28.55 mW. These results indicated that VSe 2 is an effective candidate to generate pulse laser due to its excellent nonlinear optical properties and universal photoelectric response, which may advance the applications of VSe 2 -based nonlinear optics and photoelectric devices.
研究领域:
光子学
·
凝聚态物理
·
纳米材料科学
·
非线性光学
·
激光技术
·
二维材料
·
光电功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Jing Li,Zhengguang Shi,Qianru Lin,Yaohui Zhang,Mingxue Huo,You Wang,Hsu-Sheng Tsai
VSe 2 is a promising anode material for Li-ion batteries (LIBs) due to its unique layered structure, and its metallic properties. However, further exploration to investigate the lithium storage performance of VSe 2 is limited by the synthesis difficulty of pure VSe 2 . In this work, a novel nitrogen-doped carbon modified VSe 2 obtained by using p -phenylenediamine as the reducing agent is reported. This material delivers a reversible capacity of 738.25 mA h g −1 at 100 mA g −1 and after 50 cycles, it retains 772.15 mA h g −1 . Using p -phenylenediamine as a reducing agent to obtain VSe 2 is demonstrated for the first time, and p -phenylenediamine also provides carbon and nitrogen sources for the heteroatom modification of VSe 2 . This modification of nitrogen-doped carbon facilitates the generation of new active sites, and improve charge transfer. First-principle calculations show that the diffusion barrier for the Li + migration within the VSe 2 layers is low. The ex-situ X-ray diffraction (XRD) results verify that VSe 2 stores lithium through intercalation and conversion reactions. This work may provide a new solution for synthesizing high-performance transition metal dichalcogenide electrode materials.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
计算材料学
·
无机合成
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）