IONICS
·
2022
·Vol. 28
·期 6
·2931-2942
·
IF 2.961
Zhu Shiling,Chen Susu,Zhang Hao,Yu Wenxing,Tian Yuanhao,Hu Xiaolin,Hussain Shahid,Lin Liyang,Chen Wei,Xu Chaohe
Vanadium pentoxide (V 2 O 5 ), as a common supercapacitor electrode material, has unsatisfactory electrochemical performance due to its low conductivity and ionic diffusion rate, especially its specific capacitance and rate capability, which limits its practical use. In this work, V 2 O 5 rich in oxygen vacancies is successfully prepared by a controllable two-step reduction method. A variety of advanced characterization techniques, especially X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectra, have been used to qualitatively monitor changes in oxygen vacancy content. Compared with the untreated hydrated V 2 O 5 nanosheets, the oxygen vacancy V 2 O 5 (Vö V 2 O 5 ) has a larger specific surface area (4.002 m 2 g −1 ); besides, its specific capacitance (619.5 F g −1 in 1 A g −1 ) being not only better than that of V 2 O 5 without oxygen vacancy treatment (308.0 F g −1 in 1 A g −1 ) but also its cycle stability being improved (70.7% capacity retention after 1000 cycles), it is possible to develop high-performance supercapacitors by using it as an electrode material.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2010
·
IF 3.29
Huili Zhang,Lichun Zhang,Jing Hu,Pingyang Cai,Yi Lv
This work proposed a gas sensor for the determination of tert-butyl mercaptan, one of the highly toxic volatile sulfur compounds , which was based on cataluminescence emission during its catalytic oxidation on the surface of nanosized V 2 O 5 . The cataluminescence characteristics and the optimum conditions, including the morphology of sensing material, the wavelength of cataluminescence emission, the oxygen flow rate and working temperature were investigated in detail. Under the optimized conditions, the calibration curve of the relative cataluminescence intensity versus the concentration of tert-butyl mercaptan vapor was made, with the linear range of 5.6–196 μg mL −1 and the detection limit of 0.5 μg mL −1 ( S / N = 3). The relative standard deviation (R.S.D.) ( n = 5) of relative cataluminescence intensity for 84 μg mL −1 tert-butyl mercaptan was 3.6%. There is no or weak response to some common substances, such as formic acid , alcohol (methanol, ethanol, propanol, isopropanol, n -butanol, isoamyl alcohol), o -dichlorobenzene, acetonitrile , ethyl acetate , aldehyde (formaldehyde, acetaldehyde and propanal), 1,2-dichloroethane and ammonia. Furthermore, the proposed sensor was successfully used for determining tert-butyl mercaptan in four artificial samples, with a good recovery. The results demonstrated that the proposed gas sensor had a promising capability for the tert-butyl mercaptan in routine monitoring.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Shuokun Sun,Shichuang Cui,Fei Wang,Mingrui Gao,Wei Wei,Jinxiu Dong,Xiaoyan Xia,Quanyao Zhu,Jinyong Zhang
Electrochromic devices show great potential for color switchability and ease of manipulation for reflection tuning. However, the devices’ color fit and cycle stability make it difficult to meet the requirements of functional reflective product applications. Herein, a vanadium pentoxide (V2O5)–cellulose composite electrochromic film with remarkable cycling stability and a wide range of color options is presented. Flexible reflective electrochromic devices realizing free switching between yellow and blue were successfully assembled by the prepared composite films; in the test, the device possesses a low drive voltage (±1 V) and a rapid switching response time (≤5.6 s) and excellent working status after 1000 cycles. Besides, the assembled devices demonstrated an exceptional range of optical reflection modulation upon excitation. This study presents a direction for the selection of suitable devices in the field of flexible functional materials and broadens the scope of electrochromic 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
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 8
·2020-2037
·
IF 6.813
Chang Lin Liu,Yang Liu,Xing Liu,Yun Gong
The complex [Me2NH2]V3O7 was synthesized solvothermally, and possessed a 2D [V3O7]− anionic layer with an interlayer [Me2NH2]+ cation. After cationic exchange and subsequent annealing, Al3+, Mn2+ or Zn2+-doped V2O3/C composites were obtained. Among them, oxygen-deficient Al3+-doped V2O3/C exhibits outstanding long-term cycling durability even with a high carbon content of 23.97 at%. The capacity retention is 94.7% after 1000 discharge/charge cycles at 5 A g−1, which is superior to V2O3/C, Mn2+ and Zn2+-doped V2O3/C composites. Furthermore, Al3+-doped V2O3/C with oxygen vacancies displays excellent rate performance with 90.3% capacity retention when the current density is increased 50-fold, and can deliver an average specific capacity of 340, 360, 365, 356, 343 and 307 mA h g−1 at 0.1, 0.2, 0.5, 1, 2 and 5 A g−1, respectively, and the capacity returns to 375 mA h g−1 at 0.1 A g−1. A series of ex situ characterizations revealed that Al3+-doped V2O3/C completely transformed into Al3+-doped Zn3(OH)2V2O7·2H2O during the 1st charge process. However, the capacity of the sample far exceeds the theoretical capacity of Zn3(OH)2V2O7·2H2O (224 mA h g−1), which is associated with the doping of Al3+ and its dominant surface-controlled the capacitive behavior. It is also expected that the transformation occurs in the inner accessible sites of the nonporous V2O3, which are provided by its rich oxygen vacancies. Although DFT calculations indicate that the doping of Al3+ into Zn3(OH)2V2O7·2H2O is energetically unfavorable, the present work provides a facile strategy for the preparation of Al3+-doped Zn3(OH)2V2O7·2H2O. Furthermore, the doping of Al3+ can change the host framework of Zn3(OH)2V2O7·2H2O, the positions, and the micro-environments of the inserted Zn2+, thus decreasing the binding energy and diffusion barrier of Zn2+.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhonghua Zhao,Mingyong Wang,Yunfei Chen,Yongzheng Jia,Jialiang An,Shuqiang Jiao
Vanadium oxide s, such as V 2 O 5 and V 2 O 3 , are important metallurgy products and mainly used to prepare V-based alloys for steelmaking. At present, vanadium oxide s are mainly produced by complex sodium salt roasting process. Serious environmental pollution, such as emission of ammonia nitrogen wastewater and NH 3 , are restrictive problems. Here, a clean and sustainable method for V 2 O 3 preparation is proposed by one-step molten salt electrochemical reduction of soluble NaVO 3 , i.e. an indispensable intermediate in traditional V metallurgy. The pollution issues are well solved. The theoretical decomposition voltages of different vanadate to various low-valence vanadium oxides were calculated. NaVO 3 with a solubility of 14.7 wt% is the most suitable vanadate for the direct preparation of V 2 O 3 by molten salt electrolysis. The effects of cathode structure, NaVO 3 content, electrolysis temperature and voltage on current efficiency and electricity consumption were systematically studied. High-purity V 2 O 3 with uniform particle distribution is obtained and the lowest electricity consumption is only 2.86 kWhkg −1 . V 2 O 3 is mainly produced by one-step electrochemical reduction of soluble NaVO 3 through two-electron transfer process. The economic evaluation for ferrovanadium production is preliminarily carried out. Compared with the traditional process, the cost for ferrovanadium production is lower by the aluminothermic reduction of V 2 O 3 which is prepared by clean one-step electrolysis of soluble NaVO 3 .
研究领域:
冶金工程
·
材料科学
·
环境科学
·
电化学
·
资源利用
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
L Ruiyi,Chen Yang,Zaijun Li,Mingjie Gas
Vanadium oxide become a promising electrode material for supercapacitors because of high capacitance and multiple redox. However, low intrinsic conductivity, narrow interlayer spacing and poor structural stability limit its practical application. The study reports construction of Co-doped V2O3 using asparagic acid-functionalized graphene quantum dot (GQD) and biomass carbon (BC). Firstly, V5+ and Co2+ were combined with GQD to form Co/V-GQD complex. Then, it was adsorbed on cotton, dried and annealed. The resulting Co-V2O3-GQD@BC shows one three-dimensional carbon framework. The formed V2O3 nanocrystals with rich edges and corners are dispersed on the carbon sheets. V5+ was partly reduced to form low valent V2+ specie. The V2+ and Co2+ self-doping narrows the bandgap and creates new electron transfer pathways. Graphene modification accelerates the electron transfer from V2O3 to graphene and improves the structural stability. The integration of double doping with graphene modification realizes a significant improvement of electrical conductivity and safe voltage window (1.8 V). The specific capacitance of V2O3 in Co-V2O3-GQD@BC reaches 2182.89 F g-1, which is more than other vanadium oxide electrodes. The symmetrical supercapacitor with Co-V2O3-GQD@BC electrodes provides a high capacitance (664.89 F g-1 at current density of 1 A g-1), high-rate capacity (366.67 F g-1 at 50 A g-1), cycling stability (97.65% capacitance retention after 10000-cycle) and energy density (74.8 W h kg-1 at power density of 425 W kg-1).
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Chuanlin Fan,Haitao Yang,Qingshan Zhu
Given the strong demands for high purity vanadium products dedicated for all-vanadium redox flow battery (VRFB), numerous preparation technologies have been developed. One of them, the chloride process that using vanadium oxytrichloride (VOCl 3 ) as purification intermediate presents distinct technical advantages. The intermediate is readily purified via distillation process to remove most of the impurities. However, the trace titanium tetrachloride (TiCl 4 ) is difficult to be removed, due to close saturated vapor pressures. In present work, based on thermodynamic calculation and analyses, we found that TiCl 4 reacts with water significant preferentially to form the corresponding oxide, compared with VOCl 3 . Then we proposed a novel method to remove trace TiCl 4 from VOCl 3 by selective hydrolysis – distillation. The related experiments were conducted and validated the feasibility of the innovative process. Vanadium pentoxide (V 2 O 5 ) with purity higher than 99.99 wt% (4N) was further prepared from the purified VOCl 3 by precipitation – calcination .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Xiangrui Bu,Kunfeng Ding,Qiang Wu,Yubin Yuan,Weihua Liu,Chuanyu Han,Xiaoli Wang,Xin Li
As an n-type metal oxide semiconductor (MOS), vanadium pentoxide (V 2 O 5 ) has shown great potential in gas sensing, especially for the detection of NO 2 . Herein, a highly sensitive NO 2 sensor based on 3D porous V 2 O 5 microrods (MRs) derived from metal organic frameworks (MOFs) was reported. The porous structure of vanadium-based MOF-derivatives (MIL-47) was tuned by the control of annealing temperature (300 °C–600 °C) in the pyrolysis process . The gas sensors with the MOF-derivatives are exposed to NO 2 at 150 ℃ for gas sensing tests. The sensor with MOF-derivatives annealed at 500 °C (MIL-47–500) showed the highest response (527 %) to 50 ppm NO 2 . It also showed excellent selectivity, low limit of detection, and good repeatability. The NO 2 -sensing behaviors of the MIL-47–500 sensor under ultraviolet (UV) illumination have also been investigated. Under UV illumination, the response of the MIL-47–500 sensor increased to 706 %. At 75 °C, the response of the MIL-47–500 sensor toward 50 ppm NO 2 was significantly improved from 57 % to 538 % under UV illumination. The response/recovery times were reduced from 102 s/300–48 s/178 s. The excellent performance was attributed to the unique porous structure of MIL-47–500 and the UV light excited charge carriers.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Kun Ran,Qianlin Chen,Fangxiang Song,Fenghua Yang
The development of structurally stable, highly conductive layered materials as cathode materials for aqueous zinc-ion batteries (AZIBs) is essential. Herein, polyaniline (PANI) was inserted into the interlayer of a vanadium-metal–organic framework-derived V 2 O 5 to take advantage of the selective growth of the (1 1 0) crystal plane of V 2 O 5 , facilitating sufficient diffusion of aniline within the V 2 O 5 interlayer along the vertical direction of the spatial c -axis while stabilizing the interlayer structure. The synthesized composite (PANI80-V 2 O 5 ) exhibited excellent electrochemical properties owing to the increase in the material layer spacing from 5.76 Å to 14.31 Å and the strong synergistic effect of the oxygen vacancies and large specific surface area of the material. In addition, the π-conjugated structure of PANI prevented the active material from dissolving in the electrolyte, further stabilizing its lamellar structure, which tended to collapse during electrochemical cycling. The PANI80-V 2 O 5 electrode exhibited an ultrahigh discharge capacity of 516.90 mAh g −1 at a current density of 0.1 A g −1 . Moreover, it exhibited a discharge capacity of 268.80 mAh g −1 at a current density of 10 A g −1 and a capacity retention rate of 97.77% after 3000 cycles. Therefore, this study provided a reference for developing structurally superior cathode materials for AZIBs.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jie Huang,Lingjie Hu,Liuying Wang,Weichao Wang,Chaoqun Ge,Long Wang,Mengzhou Chen,Renbing Wu,Gu Liu,Bin Wang
The simultaneous achievement of controllable electromagnetic wave absorption and electrochromism through micro-nanostructure design holds significant importance for radar stealth and visible light compatibility in complex surveillance environments. However, the synergistic design of anion insertion/intercalation and dielectric loss coordination still face significant challenges. Herein, CPBs-VO NWs composites with excellent electromagnetic wave absorption and electrochromic performance are prepared by in situ growth of CsPbBr 3 quantum dots on the surface of V 2 O 5 nanowires leveraged by the chelation effect of Pb-O bonds. The loading concentration of CsPbBr 3 quantum dots on the surface of V 2 O 5 nanowires is designed to regulate the formation and breakdown of Pb-O bonds, facilitating the investigation of the energy transfer process at the interface. The analysis reveals that the formation of Pb-O bonds enhances electron transfer across multiscale heterogeneous interfaces, resulting in increased local charge density differences, polarization, and conductivity. Additionally, it aids in the valence state change of vanadium ions through bridging, thereby achieving efficient electromagnetic wave absorption and compatibility with electrochromic performance. This study provides an insight at the atomic-level into performance enhancement and compatibility of visible light and radar stealth by precisely controlling the interface sites.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Lu Yao,Chaoran Zhang,Nantao Hu,Liyin Zhang,Zhihua Zhou,Yafei Zhang
Supercapacitors based on two-dimensional (2D) ultrathin nanomaterials of reduced graphene oxide (rGO) and vanadium pentoxide (V 2 O 5 ) are rapidly growing, but constructing three-dimensional (3D) skeleton networks structure with both high energy density and superior cycle stability remains challenging. In this work, supercapacitor based on 3D skeleton networks of rGO nanosheets/V 2 O 5 nanobelts hybrids has been successfully constructed via a simple one-pot hydrothermal method . The resultant rGO/V 2 O 5 hybrid aerogel electrodes show a high specific capacitance of 310.1 F g −1 (1 A g −1 ) and 195.2 F g −1 (10 A g −1 ). Moreover, the assembled symmetric supercapacitors based on as-fabricated hybrid electrodes deliver a high gravimetric capacitance of 225.6 F g −1 (0.5 A g −1 ), a high energy density of 31.3 Wh kg −1 (249.7 W kg −1 ) and excellent long-term cycle stability (remain 90.2% after 5000 cycles). Above all, the as-designed 3D skeleton networks, with rGO nanosheets and V 2 O 5 nanobelts hybrids intimately stacked, can give a guidance for designing other high-performance graphene-based electrodes and hold a great potential for high-performance electrical energy storages.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2022
·Vol. 8
·期 6
·e202200047
·
IF 3.82
Min Zhou,Jiajun Ma,Wensheng Yang,Shengshang Lu,Benfu Tao,Liren Qiu,Xinhai Wang,Quan Xie,Yunjun Ruan
Graphical Carbon-coated vanadium oxides with K + ion pre-embedded (KVO-C3) were hydrothermally synthesized by reducing glucose as a carbon source. The improved crystallinity of KVO-C3 facilitates Zn 2+ intercalation/extraction, which delivers a superior specific capacity of 389.2 mAh g −1 at 0.1 A g −1 and retains 83.5% capacity as current density increases 50 times. The KVO-C3 battery shows a high energy density of 209 Wh kg −1 at a power density of 3500 W kg −1 . Recently, aqueous zinc-ion batteries have become a promising candidate for energy storage devices due to their low cost, high capacity, and environmental friendliness. However, the low electrical conductivity and irreversible Zn 2+ intercalation/extraction of cathode materials limit the rate performance and cycling stability of Zn-ion batteries. Herein, carbon-coated V 2 O 5 nanoflowers with K + pre-embedment (KVO-C) were synthesized by hydrothermal and high-temperature annealing methods, showing enhanced electrical conductivity and crystallinity. Assembled with Zn anode and 2 M Zn(CF 3 SO 3 ) 2 electrolyte, the optimized KVO-C3 battery achieves a high specific capacity of 389.2 mAh g −1 at a current density of 0.1 A g −1 and retains 85% even with a 50-fold increase in current density and cycling back to 0.1 A g −1 . KVO-C3 also shows excellent capacity retention of 77% and coulomb efficiency of nearly 100% after 2000 cycles and delivers a high energy density of 209 Wh kg −1 at a power density of 3500 W kg −1 .
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）