Science China-Materials
·
2020
·Vol. 64
·期 3
·557-570
·
IF 6.098
Li Yanwei,Ji Jingcheng,Yao Jinhuan,Zhang Ying,Huang Bin,Cao Guozhong
A fundamental understanding of the electrochemical reaction process and mechanism of electrodes is very crucial for developing high-performance electrode materials. In this study, we report the sodium ion storage behavior and mechanism of orthorhombic V 2 O 5 single-crystalline nanowires in the voltage window of 1.0–4.0 V (vs. Na/Na + ). The single-crystalline nanowires exhibit a large irreversible capacity loss during the first discharge/charge cycle, and then show excellent cycling stability in the following cycles. At a current density of 100 mA g −1 , the nanowires electrode delivers initial discharge/charge capacity of 217/88 mA h g −1 , corresponding to a Coulombic efficiency of only 40.5%; after 100 cycles, the electrode remains a reversible discharge capacity of 78 mA h g −1 with a fading rate of only 0.09% per cycle compared with the 2 nd cycle discharge capacity. The sodium ion storage mechanism was investigated, illustrating that the large irreversible capacity loss in the first cycle can be attributed to the initially formed single-crystalline α′-Na x V 2 O 5 (0.02 < x < 0.88), in which sodium ions cannot be electrochemically extracted and the α′-Na 0.88 V 2 O 5 can reversibly host and release sodium ions via a single-phase (solid solution) reaction, leading to excellent cycling stability. The Na+ diffusion coefficient in α′-Na x V 2 O 5 ranges from 10 −12 to 10 −11.5 cm 2 s −1 as evaluated by galvanostatic intermittent titration technique (GITT).
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
固态离子学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 5
·050505
·
IF 3.9
Xuelu Dong,Fangyuan Dong,Keke Zhu,Haibo Li,Suyuan Zeng,Chuansheng Cui,Chonggang Fu,Lei Wang
In this work, vanadium pentoxide (V2O5) hollow microspheres with mesoporous on the shell were prepared by a solvothermal process followed by a high-temperature calcination step in air. The as-prepared hollow microspheres exhibit the mesoporous structure on the shells, which provide channels for electrolyte transfer and show excellent lithium storage properties for lithium-ion batteries. The electrochemical performances of formed V2O5 porous-hollow microsphere anodes were investigated and analyzed. Among the formed samples, integral V2O5 hollow microspheres with mesoporous on the shell achieved a reversible capacity of 710.2 mA h g−1 after 400 cycles at a current density of 0.5 A g−1. The results demonstrate an ascendant electrochemical characteristic of as-prepared V2O5 hollow microspheres with mesoporous on the shell for the energy storage devices.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Jian-Dong Song,Tong-Yang Song,Ting-Ting Zhang,Yun Wang,Meng-Fei Luo,Ji-Qing Lu
A series of supported V 2 O 5 /MgF 2 catalysts were prepared and tested for dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to synthesize 1,3,3,3-tetrafluoropropene (HFO-1234ze). The addition of V 2 O 5 in MgF 2 resulted in up to 5-fold increase in HFC-245fa conversion (from 19.2 to 95.2%) and much enhanced catalyst stability. Characterization results revealed that the dehydrofluorination initiated on the MgF 2 support triggered the transformation of V 2 O 5 to vanadium oxyfluoride (VOF x ) species via the reaction between V 2 O 5 and HF, and such species were responsible for the improved activity as they had much higher turnover frequencies (TOFs) than the MgF 2 (0.762 s −1 v.s. 0.026 s −1 at 320 °C). The kinetic results indicated that the 3.1V 2 O 5 /MgF 2 had much lower activation energy (44.6 ± 1.9 kJ mol −1 ) than the MgF 2 (69.0 ± 0.8 kJ mol −1 ). Accordingly, reaction mechanism on the V 2 O 5 /MgF 2 catalyst was proposed, which included slow dehydrofluorination on MgF 2 and fast dehydrofluorination on the VOF x species.
研究领域:
催化化学
·
材料科学
·
环境化学
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产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2018
·Vol. 12
·期 4
·321-329
·
IF 2.993
Liao Longfei,Liu Ying,Wu Shubin
A series of V2O5/SBA-15 catalysts with various loadings of 5, 10, 15 and 20% (by weight) V2O5 have been prepared by molecular designed dispersion (MDD) method and are characterized by N2 adsorption–desorption, Fourier Transform-Raman
spectroscopy (FT-Raman), transmission electron microscopy (TEM), low angle and wide-angle XRD, H2 temperature programmed reduction (TPR), inductively coupled plasma-optical emission spectrometry (ICP-OES), and Ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis, DRS) techniques.
Among V2O5/SBA-15 catalysts, the 10% V2O5/SBA-15 catalyst exhibited 88.6% 5-hydroxymethylfurfural (HMF) conversion with 57.9% yield of 2,5-diformylfuran (DFF) when molecular oxygen (0.28 MPa) and toluene were employed as green oxidant and organic
solvent respectively at 110 °C. The remarkable performance of 10% V2O5/SBA-15 catalyst is owing to the isolated distribution of uniform sized nanovanadium species which are dispersed on the pore surfaces of the hexagonally well-ordered mesoporous material SBA-15 silica
support.
研究领域:
催化化学
·
绿色化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Zhu Xueli,Yin Xiangru,Zhang Yinan,Mei Qiqi,Bai Jinshuo,Yang Guixiang,Zhang Dequan,Liang Xiaoping
V 2 O 5 films with high ion storage capacity (Q) and wide optical modulation range (∆T) have great potential for application in electrochromic devices. In this paper, Ni-La-V 2 O 5 porous ion storage films are prepared by the sol–gel method. The effects of Ni-La co-doping content, PEG content, and heat treatment temperature on the properties of V 2 O 5 films were investigated. By comparison, it was found that the Q value of 9 mol% Ni-5.5 mol% La-V 2 O 5 film was increased compared to 9 mol% Ni-V 2 O 5 film, but ∆T was decreased. In order to improve ∆T, Ni-La-V 2 O 5 porous ion storage films were prepared using Ni-La co-doping and PEG pore-former, and the optimization of process parameters was carried out via Response Surface Methodology (RSM). The RSM results showed that the influence on the Q value was in the following order: heat treatment temperature > Ni-La co-doping content > PEG content. Under the near-optimal process parameters, a satisfying V 2 O 5 film with a high Q value (120.23 mC/cm 2 ), a good ∆T (79.8%), and a short response time (3.1 s/2.8 s) were obtained, which further demonstrated the superior electrochromic performance. Graphical
研究领域:
材料科学
·
电致变色技术
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DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Baoyun Ye,Hongyi Chen,Chang Liu,Chongwei An,Jingyu Wang,Yong Zhang
The combustion performance of composite solid propellants (CSPs) significantly affects their application in the field of military and civil aircraft. Ammonium perchlorate/hydroxyl-terminated polybutadiene (AP/HTPB) composite propellants are one of the common CSPs, and their combustion performance is mainly affected by AP thermal decomposition. In this work, a simple strategy was put forward to effectively construct MXene-supported vanadium pentoxide nanocomposites (MXene/V2O5, MXV). MXene provided a good loading interface for V2O5 nanoparticles, which made MXV obtain a large specific surface area and simultaneously improved the catalytic performance of MXV for AP thermal decomposition. The catalytic experiment results showed that the decomposition temperature of AP mixed with MXV (MXV-4, 2.0 wt %) was 83.4 °C lower than that of pure AP. Moreover, the ignition delay of the AP/HTPB propellant was significantly reduced by 80.4% after adding MXV-4. The burning rate of the propellant was also increased by 202% under the catalytic action of MXV-4. Based on the above results, MXV-4 was expected to be an additive for optimizing the burning process of AP-based composite solid propellants.
研究领域:
材料科学
·
推进剂工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Chong Xia,Yuanqing Zhu,Song Zhou,Yongming Feng,Jie Shi
Besides catalyzing NOx reduction, the V 2 O 5 -WO 3 /TiO 2 catalyst can effectively suppress the formation of urea (CH 4 N 2 O) decomposition by-products in selective catalytic reduction (SCR). However, current research lacks a clear understanding of the impact of urea and its by-products on the catalyst' performance. Additionally, there is no available kinetic model to describe the decomposition process of urea and its by-products on the V 2 O 5 -WO 3 /TiO 2 catalyst. In this paper, the decomposition process of urea and its by-products on the catalyst was firstly investigated via thermogravimetric analysis (TGA). It was found that increasing the catalyst dosage can accelerate urea decomposition and block the transformation pathways from urea and biuret (C 2 H 5 N 3 O 2 ) to cyanuric acid (cya, C 3 H 3 N 3 O 3 ). However, as the decomposition temperature of the by-products increased, a larger amount of catalyst was also required. Secondly, the impact of urea and its by-products on the NOx reduction performance was investigated via the SCR test bench. The results showed that, at 200 ℃, the addition of 20 % urea, biuret, or cya decreased the NOx reduction rate by 7.2 %, 9.8 %, and 11.0 % respectively. Furthermore, the catalyst's performance was significantly improved at 400 ℃ dues to the decomposition of urea and its by-products. Then, various characterization techniques were used to analyze the morphology and chemical composition of the urea decomposition products on the catalyst at different temperatures. On this basis, a simplified urea non-catalytic and catalytic coupling mechanism model was developed, which included 7 species and 16 reactions. Finally, the kinetic parameters of the proposed urea catalytic decomposition model were optimized utilizing TGA test data, density functional theory (DFT), and genetic algorithms (GA). This study can provide guidance for the elimination of SCR urea deposits in engineering applications.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaodong Liu,Chunyang Liu,Zhiqiang Wang,Hongming Chen,Zijin Liu,Jiaqi Yang,Woon-Ming Lau,Dan Zhou
Aqueous zinc-ion batteries (AZIBs) are now vigorously explored as a class of novel and competitive candidates for large-scale energy storage in terms of high safety, eco-friendliness and low cost. In order to realize efficient Zn-storage with desirable cycling stability and rate capability, constructing suitable cathode materials that possess reliable host structure and fast Zn 2+ diffusion kinetics makes a lot of sense. Herein, novel V 2 O 5 nanofibers were facilely synthesized via a hydrothermal method and employed as a cathode material for AZIBs. By matching with aqueous Zn(CF 3 SO 3 ) 2 electrolyte, the cathode is able to achieve a specific capacity as high as 264.5 mAh g −1 at 200 mA g −1 . Even conducted at a large current density of 2000 mA g −1 , a considerable rate capability of 132.6 mAh g −1 can also be delivered. In addition, electrochemical reaction kinetics and ion diffusion mechanism were initially conducted to uncover the insights for efficient Zn-storage. This work is anticipated to offer feasible strategy for the design and fabrication of promising vanadium-based cathode materials for rechargeable AZIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·Vol. 107
·期 3
·548-559
·
IF 2.5
Pan Zixin,Liang Xiaoping,Yan Su,Zeng Jing,Bai Jinshuo,Zhang Dequan,Yang Guixiang,Liu Zhifeng
Electrochromic glass, one of the green energy-saving building materials, get more and more attention. The advancement of efficient ion storage film become a hot topic of research. The porous V 2 O 5 ion-storage film was prepared by sol-gel method using polyethylene glycol (PEG) as the pore-former. The peak current of porous V 2 O 5 films heated at 300 °C increased substantially due to the volatility temperature of PEG at 285 °C. The mutual effects of the PEG content, heat treatment temperature, and heat treatment time on the structure and electrochromic properties of porous V 2 O 5 film were investigated by the response surface method (RSM). The results show that the influence extent on ion storage is: heat treatment temperature > PEG content > heat treatment time. Under optimized process parameters of PEG content 6.2 g/100 mL sol, heat treatment time 4 h, heat treatment temperature 310 °C, the porous V 2 O 5 film exhibited excellent ion storage capacity (87.28 mC·cm −2 ). The electrochromic device (ECD) with optimized porous V 2 O 5 ion-storage film as the counter electrode of electrochromic WO 3 film has been successfully assembled, which shows fascinating performance with high optical contrast (87.8% at 550 nm) and fast response time (bleaching/coloring: 4.5/3.7 s). Graphical Abstract
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xinfei Zhang,Jianhui Zhan,Xiaobo Jia,Jinxing Ma,Bin Han,Zhiliang Wang,Feilong Li,Yitong Wang,Yuan Zhang
In contrast to traditional metal oxides that engage in only two valence state conversions, multivalent metal oxides offer additional electrons, thus accelerating the activation of peroxymonosulfate (PMS) and enhancing catalytic activity. However, the low efficiency of converting between high-valent and low-valent metal ions often limits catalytic performance. In this study, we employed a combined hydrothermal and thermal polymerization strategy to load multivalent vanadium pentoxide (V 2 O 5 ) onto graphitic carbon nitride (g-C 3 N 4 ), thereby constructing a V 2 O 5 /g-C 3 N 4 heterojunction. This heterojunction formed a built-in electric field, facilitating PMS activation and achieving a record-breaking degradation of chloramphenicol (CAP) with a rate constant of 1.13 min −1 . Experimental and theoretical analyses indicated that the synergy between radical and non-radical pathways was the primary mechanism for efficient CAP removal. The built-in electric field altered orbital occupancy, reduced the bandgap, and enhanced electron transfer from g-C 3 N 4 to V 2 O 5 , accelerating the conversion between vanadium valence states and enhancing PMS activation. Furthermore, the V 2 O 5 /g-C 3 N 4 /PMS system exhibited a broad operational pH range (2–10), robust resistance to matrix interference, and exceptional durability, demonstrating its applicability for mitigating ecological toxicity of CAP and treating typical refractory organic pollutants. This study advances the understanding of how built-in electric fields promote PMS activation and introduces a novel approach for addressing emerging pollutants in aquatic environments.
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
CHEMOSPHERE
·
2022
·
IF 8.943
Vasanthakumar V,Murad Alsawalha,Thamer Alomayri,Saud Allehyani,Yi-bo Hu,Ming-Lai Fu,Baoling Yuan
A novel composite of multiwall carbon nanotube (MWCNT) supported V 2 O 5 quantum dots decorated Bi 2 O 3 hybrid was prepared by the simple wet-impregnation method, and the photocatalytic performance of the prepared samples was investigated against the photodegradation of ciprofloxacin (CIP). Herein, different samples of pristine, V 2 O 5 /Bi 2 O 3 and MWCNT@V 2 O 5 /Bi 2 O 3 hybrid photocatalyst were prepared and systematically characterized by various physicochemical techniques. The characterization results demonstrated that the introduction of MWCNT can change the energy band gap of V 2 O 5 /Bi 2 O 3 , and the band energies vary with a constituent of MWCNT@V 2 O 5 /Bi 2 O 3 catalyst, in which MWCNT@V 2 O 5 /Bi 2 O 3 -5 (0.05 g@0.50 g:0.50 g) has the optimal band gap energy of 2.46 eV. The photocatalytic test demonstrates that the MWCNT@V 2 O 5 /Bi 2 O 3 -5 hybrid composites exhibited enhanced photocatalytic activity in CIP degradation compared to that pure and other photocatalyst and its degradation efficiency did not decrease significantly even after five cyclic experiments. The enhanced photocatalytic activity was due to the formation of heterojunction among MWCNT, V 2 O 5 and Bi 2 O 3 , which distinctly improved the separation efficiency of the photogenerated charge carrier, thus increasing the degradation performance. This work gives a new approach to designing an efficient photocatalyst for contaminants degradation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Zhuo Wang,Huiyu Huang,Li Zeng,Yuncheng Wang,Liang Lv,Cuiying Dai,Weiguo Mao,Xi Chen,Daining Fang
Free-standing MWCNTs/V 2 O 5 nanobelts composite architecture electrodes for lithium ion batteries (LIBs) are prepared based on hydrothermal method , electrostatic self-assembly approach and vacuum filtration deposition technique . Such kind of nanoarchitecture enhances the electrochemical kinetics and structural stability of V 2 O 5 cathodes. The distribution and evolution features of plane strains in free-standing MWCNTs/V 2 O 5 cathodes surface are in-operando monitored by using digital image correlation method and systematically discussed. The strain results show that the evolution of strain against potential obeys general Arrhenius relation under galvanostatic charge-discharge cycling. Considering the effect of lithium ion concentration, the elastic modulus of 20 wt% MWCNTs/V 2 O 5 electrode is confirmed via nanoindentation. The evolutions of average plane stresses in the free-standing MWCNTs/V 2 O 5 electrodes, as well as the contributions of mechanical and electrochemical components, are evaluated and discussed by mechano-electrochemical constitutive equation during electrochemical process. The analytical methods used in this article are universal for revealing the electrode mechano-electrochemical failure mechanism in LIBs.
研究领域:
材料科学
·
电化学
·
机械工程
✓ 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）