POWDER TECHNOLOGY
·
2023
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IF 5.2
Fupeng He,Jianbo Zhao,Qingqing Hu,Yongjie Liu,Qingyun Huang,Zhixiong You,Xuewei Lv
We investigate the isothermal kinetics of the reduction and nitridation of V 2 O 3 using NH 3 . The reaction mechanism is also discussed based on the thermodynamic and experimental results. The reaction procedure between V 2 O 3 and NH 3 can be divided into two stages. The first stage is mainly the deoxygenation process, whereas the second is the nitridation process. The deoxygenation process follows a two-dimensional phase boundary reaction model, and a modified integrated model (IM + diffusion) was proved to be the best function at temperatures above 1023 K. For the second stage, the three-dimensional diffusion model is determined as the mechanism function. Thermodynamic analysis predicts the feasibility between V 2 O 3 and NH 3 to form VN . The VN product is a solid solution (VN x O y ) (0 < x,y < 1, x + y = 1), which can be formed at 873 K. The Rietveld refinement analysis indicates the N content of VN x O y gradually increases with increasing temperature. The highest N content is approximately 15.83% at 1073 K for 2 h.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Separations
·
2022
·Vol. 9
·期 8
·196
·
IF 3.344
Guoquan Zhang,Kun Wang,Mingzhi Luo
The technology of simultaneously recovering V and Ti from vanadium slag via ammonium salt roasting has proven to be an efficient route. However, due to the phase stability and complex chemical composition of vanadium slag, intermediate materials containing Fe, V, Ti and Mn are difficult to be characterized critically. This work aims to investigate the decomposition and transformation of vanadium slag during ammonium salt roasting, using a combination of FT-IR, XRD, XPS and SEM techniques. It was found that the lattice structure of Fe-contained spinel would be transformed from FeV2O4to Fe2+VnFe2−nO4(0 < n < 2) during directly roasting in the air. However, there is no obvious change for Ti-contained and Mn-contained spinel. Using NH4HSO4(ABS) as an additive and roasting the slag in the N2atmosphere, those spinels would be decomposed into various sulfate salts. Meanwhile, when the slag was roasted with NH4HSO4in the air, a part of Fe(II) in (NH4)2Fe(SO4)2would be transferred into Fe(III), but V(III), Ti(IV) and Mn(II) from those salts would remain the same valance state. Ultimately, about 88% V and 81% Ti were recovered, when vanadium slag was roasted at 663.15 K with a 1:5 ratio of slag-to-NH4HSO4and followed by 8 vol.% H2SO4leaching.
研究领域:
冶金学
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材料科学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Kang Hua,Xiujuan Li,Zewei Fu,Dong Fang,Rui Bao,Jianhong Yi,Zhiping Luo
Manganese vanadate (Mn 2 V 2 O 7 ) nanosheets on titanium (Ti) foil are synthesized by a cation-exchange method using sodium vanadate nanowires as the precursor. By varying the cation-exchange time in manganese acetate (Mn(CH 3 COO) 2 ) aqueous solution, the tunable morphologies and chemical components of the samples are tested, compared and presented in detail. The evolution process contains cation-exchange of Mn 2+ and Na + , newly generated H + to dissolve vanadate, and precipitation manganese vanadate nanosheets on the original sodium vanadate nanowire surface. Furthermore, the thermal and crystal properties of the as-prepared nanosheets are evaluated by calcinations at different temperatures. The Mn 2 V 2 O 7 nanosheets obtained at 250 °C, which are used as electrode of lithium-ion battery, have the first discharge capacity of 1048.0 mAh g −1 at 50 mA g −1 . After 100 cycles, the residual capacity is more than 800 mAh g −1 .
研究领域:
材料科学
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电化学
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DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Longyan Zhang,Junyan Du,Lijun Wang
In the context of the global energy transition, the intermittency and instability of renewable energy have become major bottlenecks limiting its large-scale application. Vanadium redox flow batteries (VRFBs), recognized for their long cycle life, high safety, and environmental benefits, are ideal solutions for large-scale energy storage. The cost and performance of the electrolyte are critical factors determining the efficiency and economic viability of the battery. However, the preparation of vanadium electrolytes faces challenges, including complex production processes and high costs. Thus, developing high-concentration, high-performance, and low-cost vanadium electrolytes while ensuring green production of raw materials is an urgent technical challenge. This study presents a short-process clean method for the production of high-purity VOCl 3 from NaVO 3 extracted from vanadium slag, which is applied to the sulfate-chloride electrolyte system of VRFBs. In this system, VOCl 3 serves as the Cl − source, significantly reducing production costs by eliminating the need for additional HCl. Compared to traditional vanadium raw materials (e.g., V 2 O 5 and VOSO 4 ), the energy efficiency (EE) of the electrolyte is improved by 13.6 %. This research presents an efficient and cost-effective approach for the sustainable production of vanadium electrolytes, providing significant support for the advancement of high-performance and economically viable VRFB technology.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 9
·4473-4482
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IF 3.343
Dixuan Cheng,Gang Cheng,Zhangxing He,Lei Dai,Ling Wang
Summary In this paper, titanium dioxide (TiO 2 ) nanoparticles were employed as catalysts towards V 2+ /V 3+ redox couple of vanadium redox flow battery (VRFB). The effect of TiO 2 phase on the electrocatalytic performance for negative couple was systematically investigated. The electrochemical properties of TiO 2 with different phase were assessed via cyclic voltammetry and electrochemical impedance spectroscopy by using AB as conductive agent. Obtained from the results, anatase TiO 2 (α-TiO 2 ) exhibits superior electrocatalytic activity to rutile TiO 2 (γ-TiO 2 ). The VRFB cell performs well at discharge capacity, voltage efficiency, and energy efficiency by employing α-TiO 2 -modified negative electrode with current density varying between 50 and 100 mA cm −2 . The discharge capacity of α-TiO 2 -modified cell with vanadium ion concentration of 1.6 M comes up to 113.5 mA h at 100 mA cm −2 current density, which is increased by 39.1 mA h after modification for negative electrode. Moreover, the corresponding energy efficiency increases by 7.5% after modification of α-TiO 2 . Experimental results show that TiO 2 is an ideal catalyst for VRFB. Moreover, α-TiO 2 demonstrates superior electrocatalytic performance to γ-TiO 2 towards V 2+ /V 3+ reaction.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Yanjiao Ma,Naeem Akhtar Qaisrani,Lingling Ma,Panyue Li,Lv Li,Shoutao Gong,Fengxiang Zhang,Gaohong He
A side-chain hydrolysis method is proposed for fabricating high performance nanoporous membranes that can be used in vanadium flow batteries (VFBs). The membranes were fabricated facilely by hydrolyzing the bulky ester groups at the side chain of a cross-linked copolymer . Such hydrolysis creates pores that function as the pathway for proton transport while the cross-links can minimize membrane swelling induced by the hydrolysis derived carboxylic acid groups. The cross-links also contain cations so that vanadium permeation can be suppressed via Donnan repulsion effect. Therefore, the fabricated membrane combines the benefits of ionic and porous membranes, and thus can balance proton conduction and the vanadium ion restriction, giving rise to a good performance in a VFB. The optimized VFB showed a coulombic efficiency of 97.3% and an energy efficiency of 82.7% at 80 mA cm −2 for 100 cycles. Our work provides a facile, novel and cost-effective method to fabricate high-performance membranes for VFB applications.
研究领域:
材料科学
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电化学
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能源技术
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DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 14
·4602-4608
·
IF 4.029
Aruuhan Bayaguud,JianDa Li,Shan She,Yongge Wei
A reaction strategy for the post-functionalization of hexavanadate derivatives is presented herein. In this study, five polyoxovanadate-based organic–inorganic hybrids TBA2[V6O13{(OCH2)3CCOO(CH2)15CH3}2] (2), TBA2[V6O13{(OCH2)3CCOO(CH2)8CHCH2}2] (3), TBA2[V6O13{(OCH2)3CCOOCH2CF3}2] (4), TBA2[V6O13{(OCH2)3CCOO(CH2CH2O)3CH3}2] (5), and TBA2[V6O13{(OCH2)3CCOO(CH2)12OH}2]·2CH3CH2OH (6) were successfully synthesized via esterification of carboxylic acid groups-containing TBA2[V6O13{(OCH2)3CCOOH}2] (1) with five alcohols possessing different functional groups. These hybrids were characterized by single crystal X-ray diffraction, IR, ESI-MS, 1H and 13C-NMR spectroscopies, and elemental analysis. Moreover, the formation of large vesicles was observed in a mixed solution of compound 2 due to its surfactant-like structure.
研究领域:
无机化学
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材料科学
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DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2024
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IF 4
Xinyue Wei,Kaijing Xue,Yanting Wei,Sumin Wang,Xiao Zhang,Xinhai Wang,Qiguan Wang
Cathode materials play a crucial role in the energy-storage performances of zinc ion battery (ZIB). In this paper, the two-dimensional vanadium carbide MXene (V 2 C-MXene) nanoplates intercalated by Cu 3 V 2 O 7 (OH) 2 ·2 H 2 O (CuVO) are synthesized. The intercalation of CuVO in the interlayers of V 2 C-MXene overcomes self-aggregation of CuVO and improves its structural stability . Meanwhile, the enlarged interlayer spacing of highly conductive V 2 C-MXene upgrades the electron transfer within the composite. As the cathode electrode of ZIB, the CuVO intercalated V 2 C-MXene (CuVO@V 2 C-MXene) battery shows capacity as high as 551.8 mAh g −1 when discharged at 0.5 A g −1 . The capacity retention rate reaches 91.8% after 3000 cycles at high current density of 6.0 A g −1 . As a comparison, the CuVO//Zn battery has capacity only 193.3 mAh g −1 at 0.5 A g −1 , with the capacity retention of just 43.1% after 3000 cycles at 6.0 A g −1 . Simultaneously, the CuVO@V 2 C-MXene//Zn illustrates greatly improved rate capability compared with CuVO//Zn. The CuVO@V 2 C-MXene composite nanoplates in this work show promise in fabrication of high capacity metal ion batteries.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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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
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材料科学
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环境科学
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电化学
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资源利用
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DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Chao Yue Zhang,Guo Wen Sun,Zu De Shi,Qian Yu Liu,Jiang Long Pan,Yan Chun Wang,Hao Zhao,Geng Zhi Sun,Xiu Ping Gao,Xiao Jun Pan,Jin Yuan Zhou
Atom-intercalated transition metal disulfides (TMDs) have attached much attention mainly due to their highly improved conductivity. But it is few reported that the atom intercalation can enable the TMDs have unexpected catalytic properties, caused by the unit-cell deformation in them. In this work, a type of V 0.25 -intercalated VS 2 (V 5 S 8 ) nanoflakes was designed via a direct vulcanization method combining Kirkendall heat diffusion effect, and used as the promotor for lithium-sulfur batteries (LSBs). The V 5 S 8 possesses a NiAs crystal structure, in which V atoms occupy the interlayer spacing between VS 2 monolayers, which will unavoidably cause the unit-cell deformation. As expected, the CNF@V 5 S 8 /S cathodes show a specific capacity of 1260 mAh g −1 at 0.2 C, and can keep 73.65% of the capacity with charge/discharge rate increasing 10 times; while the CNF@VS 2 /S ones can only retain 54.0% of the initial capacity. Moreover, the CNF@V 5 S 8 /S cathodes show an ultralow decay rate of only 0.0312% per cycle for 1500 cycles at 5 C. Furthermore, the catalysis effect of V 5 S 8 on the conversion of lithium polysulfide (Li 2 S n , n = 1, 2, 4, 6 and 8) and S 8 clusters were systematically discusses. Besides, the V 5 S 8 can further enable LSBs achieve a high areal capacity (8.2 mAh cm −2 with sulfur loading of 7.8 mg cm −2 ) and a high dynamic flexible stability at bending angle between 0 and 180 °.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Hailun Yang,Pengge Ning,Hongbin Cao,Menglei Yuan,Jianpeng Feng,Jiaxin Yue,Zhenchao Liu,Gaojie Xu,Yuping Li
Hierarchically nanostructured carbon hybrids with highly exposed active sites and specific surface area have been widely researched in high-performed electrochemical capacitors. Inspired from the synergistic effect of uniformly distributed active components and stable carbon substrate, combining with green solvent extraction process, we explored a facile strategy to prepare vanadium nitride quantum dots/nitrogen-doped hierarchical carbon nanocomposites (VNQD/NDHCs) from vanadium aqueous solution, which can provide large pseudocapacitance and excellent electrochemical stability. Vanadate is selective recovered from aqueous solution in form of vanadium-organic compounds (VAORCs) as precursor. Primary amines favor not only the selective metal-polymer coordination, but also the formation of cross-linked carbon matrix. Then, during chemical molecules vapor deposition (CMVD), the vanadate is in-situ nitrided along with the formation of hierarchical carbon. The prepared VNQD/NDHCs-800 exhibits exceptional capacitance (318.3 F g −1 at 1 A g −1 ) and retains 89.7% of the initial capacities after 12000 cycles. SEM and TEM images confirm that a large amount of quantum dots are well embedded in a graphitic carbon matrix, which provides abundant electroactive sites and fast ion diffusion for capacitive storage. This work indicates that it is feasible to directly recovery valuable metals from aqueous solutions to prepare high-performance electrode materials .
研究领域:
材料科学
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电化学
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DOI
高影响因子
NANO LETTERS
·
2020
·
IF 11.238
Xiao Wang,Baojuan Xi,Xiaojian Ma,Zhenyu Feng,Yuxi Jia,Jinkui Feng,Yitai Qian,Shenglin Xiong
Vanadium-based compounds with an open framework structure have become the subject of much recent investigation into aqueous zinc-ion batteries (AZIBs) due to high specific capacity. However, there are some issues with vanadium dissolution from a cathode framework as well as the generation of byproducts during discharge that should not be ignored, which could cause severe capacity deterioration and inadequate cycle life. Herein, we report several barium vanadate nanobelt cathodes constructed of two sorts of architectures, i.e., Ba1.2V6O16·3H2O and BaV6O16·3H2O (V3O8-type) and BaxV2O5·nH2O (V2O5-type), which are controllably synthesized by tuning the amount of barium precursor. Benefiting from the robust architecture, layered BaxV3O8-type nanobelts (Ba1.2V6O16·3H2O) exhibit superior rate capability and long-term cyclability owing to fast zinc-ion kinetics, enabled by efficiently suppressing cathode dissolution as well as greatly eliminating the generation of byproduct Zn4SO4(OH)6·xH2O, which provides a reasonable strategy to engineer cathode materials with robust architectures to improve the electrochemical performance of AZIBs.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）