ACS Applied Energy Materials
·
2022
·
IF 6.959
Shanshan Deng,Qingfeng Chang,Donglai Li,Boyu Wang,Haibo Jin,Jingbo Li
VO2 is a promising candidate for smart energy-saving windows because of its unique thermochromism but suffers from a high transition temperature of 68 °C and poor thermochromic performance near room temperature. We fabricated a W-VO2/Cs0.32WO3 (CWO) composite flexible film, which shows a low transition temperature of 31.1 °C (W-VO2/CWO = 1:1) and much enhanced near-infrared shielding performance. The optimal W-VO2 + 0.5CWO reaches a desired near-infrared shielding efficiency of 76.34%. A model-house test under simulated solar irradiation further signifies the excellence of the W-VO2 + 0.5CWO composite flexible film under ambient conditions. The robust performance is attributed to the synergetic effects between W-VO2 and Cs0.32WO3, among which the former possesses a low MIT transition temperature and the latter possesses photo-thermal performance.
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DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Lv Weifeng,Yang Can,Meng Ge,Zhao Ruifeng,Han Aijuan,Wang Rong,Liu Junfeng
Vanadium oxide has attracted extensive attention for electrochemical capacitors due to its wide range of versatility. However, due to the relative poor conductivity and chemical stability of vanadium oxide, severe losses of capacitance often occur during charge and discharge processes. Herein, a free-standing vanadium dioxide (VO 2 (B)) nanobelts/reduced graphene oxide (VO 2 /rGO) composite film was fabricated by assembly of VO 2 (B) nanobelts and rGO for supercapacitors. The flexible rGO sheets and VO 2 (B) nanobelts intertwined together to form a porous framework, which delivered a 353 F g −1 specific capacitance at 1 A g −1 , and after 500 cycles, the specific capacitance retention rate was 80% due to the enhanced conductivity of the VO 2 (B) nanobelts by rGO and increased transport of ions and electrons by the porous structures. An all-solid-state symmetrical supercapacitor was assembled from the VO 2 /rGO composites, which exhibited good energy storage performance with a maximum voltage of 1.6 V. The maximum power density is 7152 W kg −1 at the energy density of 3.13 W h kg −1 , ranking as one of the highest power densities for reported materials. In addition, after 10000 cycles, it still has a specific capacitance retention rate of 78% at 10 A g −1 .
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuang Zhang,Rongwen Lu,Shufen Zhang,Bingtao Tang
Solar thermoelectric generation (STEG) is an excellent and environmentally-friendly way to convert thermal energy into electricity by utilizing Seebeck effect of thermoelectric material. However, how to overcome the rigidity and large output fluctuation of traditional STEG is the key to realize its large-scale application in self-powered devices. Herein, a smart light-driven flexible STEG system was designed and constructed through simple layered structure of VO 2 flexible film and carbon nanotube (CNT) thermoelectric modules. Based on the optical control characteristics of VO 2 flexible film due to the thermal crystal phase transformation, and the light capture, photo-thermal-electric conversion capabilities of CNT flexible film, the smart light-driven flexible STEG system exhibits good flexibility, light-thermal-electrical conversion and stable voltage output. In the above system, CNT, polyvinylidene fluoride (PVDF) as raw material and polyethyleneimine (PEI) as electron donor, p- and n-type flexible thermoelectric films and modules were constructed; VO 2 ultrafine powder was dispersed in polyvinylpyrrolidone (PVP), and the optical control VO 2 flexible film was obtained by simple spin coating on the flexible substrate. The system is so flexible that can be folded or bended to different shapes to adapt to different application environments. Furthermore, the intelligent light-driven flexible STEG system can obtain relatively stable voltage to prevent the damage of equipment caused by large voltage fluctuation and has great application potential in civil micro-self-powered devices.
研究领域:
材料科学
·
能源技术
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Haining Ji,Dongqing Liu,Haifeng Cheng
Vanadium dioxide (VO 2 ) is a remarkable thermochromic material for application in adaptive infrared camouflage due to the reversible phase transition that is coupled with an abrupt change in infrared optical properties . However, the relatively high phase transition temperature and the unclear infrared optical modulation characteristics in the mid-infrared and far-infrared regions largely restrict its practical applications. Here, W-doped VO 2 nanoparticles were successfully prepared to reduce the transition temperature. When the effective doping amount of W was 1.70%, the transition temperature decreased to 43.2 °C. Importantly, the infrared properties of W-doped VO 2 nanoparticles were studied in both MWIR (3–5 μm) and LWIR (8–14 μm) thermal atmospheric windows, for the first time, which exhibited significant infrared optical changes, with emissivity variation of Δε = 0.17 and Δε = 0.28, respectively. These favorable results further promote the development of the adaptive camouflage.
研究领域:
材料科学
·
光学工程
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 37
·期 1
·19
·
IF 2.8
Liang Jiran,Yu Yong,Bai Yunfei,Zhang Yingfu,Wu Tong,Zhang Dequan,Lei Dangyuan
Vanadium dioxide (VO 2 ) exhibits optical regulation properties in the solar band through a thermally induced insulator-to-metal phase transition near 68 ℃. Tungsten doping can decrease the VO 2 phase transition temperature ( Tc ) to near room temperature and enhance its applicability in smart windows for building energy saving. The optical regulation performance of tungsten-doped VO 2 (W-VO 2 ) is crucial for its smart window applications and varies with doping concentration. In this work, W-VO 2 nanoparticles were synthesized via a facile one-step hydrothermal method, and the effects of W doping on the Tc and particle morphology were systematically analyzed. This approach achieved a low Tc and improved optical performance without complex post-processing. The optical performance in the solar band was investigated with different doping concentrations ranging from 0.0 at to 2.0 at%. The sizes of the W-VO 2 nanoparticles ranged from 34.9 to 45.2 nm in diameter. The Tc decreased with increasing doping concentration and reached as low as 29.9 ℃ upon heating at a doping concentration of 2.0 at%. The W-VO 2 /PVP composite films exhibited excellent thermochromic performance. The luminous transmittance reached 52.71% and the solar modulation efficiency was up to 11.75% at a doping concentration of 1.0 at% and a volume fraction of 1.29%. These results demonstrate the potential of VO 2 nanoparticles in energy-saving smart window applications as a high-performance, low-cost material.
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高影响因子
Nano Energy
·
2018
·
IF 13.12
Yuliang Chen,Zhaowu Wang,Shi Chen,Hui Ren,Bowen Li,Wensheng Yan,Guobin Zhang,Jun Jiang,Chongwen Zou
The use of electric-field to manipulate the transport properties of correlated oxides is promising for achieving nano-functional electronic devices. As a typical correlated oxide material, vanadium dioxide (VO 2 ) displays a special metal-insulator transition (MIT) at about 340 K. In this work, we select a water-free electrolyte gel, Li + /propylene carbonate, to achieve a non-volatile and reversible Li-doping and phase modulation in nano-VO 2 crystal film under gating voltages. Synchrotron characterizations indicate the originally insulating VO 2 undergoes an effective structure change and an increased V 3 d -O 2 p hybrid t 2 g -orbital occupancy, which is responsible for the metallic state formation as proved by first-principle calculation. The field-driving Li-doping shows pronounced facet dependence, indicating the existence of energetically favored channels for Li-ions diffusion along V-V chains as proved by dynamic stimulation. Our current findings will supply opportunities for the electric-field control of atomic sieve, correlated ionitronics and synaptic transistor.
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高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Yamei Li,Shidong Ji,Yanfeng Gao,Hongjie Luo,Ping Jin
Vanadium dioxide (VO2) is a key material for thermochromic smart windows that can respond to environmental temperature and modulate near-infrared irradiation by changing from a transparent state at low temperature to a more reflective state at high temperature, while maintaining visible transmittance. Here, we demonstrate for the first time that the Mott phase transition characteristics in VO2 nanoparticles can be remarkably modified by misfit strains occurring at the epitaxial interface between VO2 and the anatase TiO2 of VO2/TiO2 core–shell particles. The heteroepitaxial growth of the as-synthesized particles followed an unprecedented orientation relationship, and an epitaxial growth mechanism is proposed to explain this behavior. A relatively small theoretical coherent misfit (3–11%) and a moderate heating rate (20 °C·min–1) in the preparation of the core–shell structure were critically important from the thermodynamic and kinetic perspectives, respectively. The misfit-induced interfacial strain along the uniaxial cR axis increased the transition temperatures, especially on the cooling portion of the heating–cooling cycle, leading to a notably reduced transition hysteresis loop width (from 23.5 to 12.0 °C). Moreover, the optical band gap was also engineered by the interfacial effect. Such a reduced hysteresis showed a benefit for enhancing a rapid response for energy saving thermochromic smart windows.
研究领域:
材料科学
·
纳米技术
·
凝聚态物理
·
智能涂层
·
节能材料
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DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Xuezhen Zhai,Xiaohong Chen,Ruihan Li,Lamei Zhang,Xuzhe Wang,Cui Shang,Chengzhou Zhao,Huawei Zhang,Jimin Shang,Dewei Liu
VO 2 (B) has emerged as a promising cathode candidate for aqueous zinc-ion batteries (ZIBs) due to its unique tunnel-structured framework that facilitates zinc ion transport. Nevertheless, practical implementation faces challenges including limited coulombic efficiency, inadequate cycling stability, and restricted rate capability, primarily attributed to poor electrical conductivity and strong Zn 2+ interionic repulsion. In this work, Al 3+ is selectively incorporated into VO 2 (B) and induced structural optimization in Al x V 1- x O 2 (B), where controlled lattice contraction and electronic structure modification near the Fermi level. Aluminum doping induces 3D morphology that enhances ion diffusion pathways and electrolyte interaction. The engineered material exhibits enhanced electrochemical kinetics through oxygen vacancy formation (providing active sites) and substantially improved pseudo-capacitive charge storage. The optimized Al 0.05 V 0.95 O 2 (B) cathode achieves a remarkable specific capacity of 364.7 mA·h·g −1 at 0.1 A/g, while maintaining 91.64 % capacity retention after 2000 cycles under high-current operation (5.0 A/g), demonstrating superior electrochemical stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Xianxiang Liu,Jiafu Xiao,Hui Ding,Wenzhou Zhong,Qiong Xu,Shengpei Su,Dulin Yin
Amino modified SBA-15 (SBA-NH 2 ) was used to immobilize vanadyl (VO 2+ ) and cupric (Cu 2+ ) ions, giving SBA-NH 2 -VO 2+ and SBA-NH 2 -Cu 2+ catalysts, respectively, and the as-prepared catalysts were characterized by XRD, XPS, TEM and Nitrogen adsorption–desorption technologies. The catalytic performance of the SBA-NH 2 -VO 2+ catalysts for the oxidation of HMF can be enhanced by the use of SBA-NH 2 -Cu 2+ as the co-catalyst. Several important reaction parameters were investigated, and it was found that the reaction solvent showed a great effect on the oxidation of HMF. The highest HMF conversion and product selectivity were obtained in aromatic solvents. The highest HMF conversion reached 98.8% at 110 °C in 4-chlorotoluene, affording DFF and 2,5-furandicarboxylic acid (FDCA) with yields of 28.9% and 62.7%, respectively. More importantly, the catalysts could be recycled and showed no significant decrease of their catalytic activities.
研究领域:
化学工程
·
催化材料
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jiarui Zhao,Zhen Wang,Hao Wang,Yan Li,Changqing Fang
With the rapid development of communication technology, it will lead to many electromagnetic wave (EMW) pollutions affecting the normal operation of precision instruments in industry. Then need smart electromagnetic interference (EMI) shielding material to protect the instrument from electromagnetic radiation . In this paper, multi-dimensional architectures yolk-shell-like VO 2 (M)/Ti 3 C 2 T x MXene (MXene) composite films (VM) were successfully prepared by hydrothermal treatment and electrostatic self-assembly. Yolk-shell-like VO 2 (M) microspheres were riveted onto few-layer MXene nanosheets as a smart EMI shielding material. Above 65 °C, the metal-insulator phase transition (MIT) of VO 2 (M) changes from the semiconductor state to the metallic state. VM composite films possess temperature controlled EMI shielding properties, which have not been reported before. When the thickness is 29.06 µm, the composite sample exhibits an EMI SE of 43.5 dB at 85 °C, which is 8 dB higher than room temperature . Besides, the few-layer structure and the unique yolk-shell-like structure of VM composite films exhibit excellent dielectric loss. The introduction of few-layer MXene nanosheets improves the EMI shielding performance of yolk-shell-like VO 2 (M) microspheres and achieves optimized impedance matching. Therefore, VM composite films are expected to provide new ideas for smart EMI shielding materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chenyuan Zhao,Yuxiang Zhou,Tianyu Shi,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
Although lithium sulfur batteries (LSBs) have high theoretical capacity and energy density , low conductivity of sulfur and the discharge species (Li 2 S 2 , Li 2 S), the polysulfide shuttle and the large volume change hinder the commercialization of LSBs. To tackle the problem, we hydrothermally prepared a special cocklebur-like ZnSe-VO 2 @rGO nanostructure , in which graphene oxide (GO) is active in inducing thorn-like VO 2 nanorods grown on carambola-like VO 2 nanostructures. In this structure, the polar VO 2 and ZnSe quantum dots (QDs) have strong chemical adsorption that can catalyze the polysulfide conversion and alleviate the shuttle effect; besides, the thorn-like VO 2 nanorods act like numerous tentacles that capture polysulfides by increasing the contact area, and the reduced graphene oxide (rGO) nanosheets not only buffer the volume change, but also enhance the conductivity of the framework and improve the ion and electron transfer . Boosted by the synergetic effects of VO 2 , rGO and ZnSe QDs, the ZnSe-VO 2 @rGO/S cathode achieves a high specific capacity of 1026.1 mA h g −1 at 0.2 C and 712.3 mA h g −1 at 2 C. Good cyclic stability was obtained as well, with a high reversible capacity of 820 mA h g −1 and high retention of 89.1 % after cycling at 0.5 C for 150 cycles. Such outstanding performance indicated its good potential for use in advanced LSBs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wenxiong Chen,Honglong Xing,Shengtao Gao,Ping Yang,Xiaoli Ji
The development of heterojunction composite materials with excellent electromagnetic wave absorption performance is emerging as an effective means to address the hazardous electromagnetic waves . Here, two types of Cu 9 S 5 @VO 2 microspheres with different morphologies were designed. The Cu 9 S 5 @VO 2 microspheres were characterized by scanning electron microscopy, transmission electron microscopy , X-ray diffraction, Raman spectroscopy , X-ray photoelectron spectroscopy, and vector network analyzer. Results show that the minimum reflection loss ( RL min ) of unique lamellar-flower Cu 9 S 5 @VO 2 sphere reaches −56.98 dB, and the wide effective absorption bandwidth (EAB) is 6.88 GHz at only 2.5 mm thickness due to the synergistic effect of multiple loss mechanisms. Radar simulated radar cross section (RCS) results show a reduction of 16.56 dBm 2 . The design engineering of the phase interface on the material surface can functionalize the material surface properties, introduce lattice defects and polarization behavior, and improve the microwave absorption performance of the material. This work enriches the use of copper sulfide-based functional composites in microwave absorption with high-performance microwave absorbers by designing microscopically controllable, simple processes and heterojunction design.
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高影响因子
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