MOLECULES
·
2023
·Vol. 28
·期 4
·1823
·
IF 4.6
Jingjie Lv,Haibo Ren,Ziyan Cheng,Sang Woo Joo,Jiarui Huang
To solve the slow kinetics of polysulfide conversion reaction in Li-S battery, many transition metal nitrides were developed for sulfur hosts. Herein, novel polyaniline-coated porous vanadium nitride (VN) microrods were synthesized via a calcination, washing and polyaniline-coating process, which served as sulfur host for Li-S battery exhibited high electrochemical performance. The porous VN microrods with high specific surface area provided enough interspace to overcome the volume change of the cathode. The outer layer of polyaniline as a conductive shell enhanced the cathode conductivity, effectively blocked the shuttle effect of polysulfides, thus improving the cycling capacity of Li-S battery. The cathode exhibited an initial capacity of 1007 mAh g−1at 0.5 A g−1, and the reversible capacity remained at 735 mAh g−1over 150 cycles.Keywords:VN;microrods;sulfur host;cathode;lithium–sulfur battery
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 13
·18465-18476
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IF 4.672
Yang You,Qingqing Hu,Fupeng He,Yongjie Liu,Qingyun Huang,Xuyang Liu,Zhixiong You,Xuewei Lv
Summary Ammonia gas (NH 3 ) is a clean energy, as well as an efficient reduction and nitridation agent. A novel process of reduction and nitridation with NH 3 followed by magnetic separation and low-temperature selective chlorination to deal with vanadium slag has been proposed. Vanadium spinel (V-Fe spinel, FeV 2 O 4 ) is the main V-bearing phase in vanadium slag, and its reduction and nitridation behavior with NH 3 were investigated in this study. Thermodynamic analysis indicated that the reaction was feasible. The experimental results demonstrated that NH 3 gas was an excellent reagent for reduction and nitridation. DFT calculation proved that NH 3 molecule was easier adsorbed on V atom. The phase component of the final product was Fe/Fe 4 N/VN x O y , whose relative mass fractions obtained by Rietveld refinement analysis were 23.5%, 1%, and 75.5%, respectively. The evolution of iron and vanadium was in the order FeV 2 O 4 → Fe 4 N/Fe 6 N 2−3 → Fe 4 N/Fe and FeV 2 O 4 → V 2 O 3 → VN x O y , respectively. VN x O y was a solid solution, whose O content decreased gradually as the temperature and duration time increased, whereas the N content increased correspondingly. The O content can be decreased to less than 0.10 wt.% after reduction and nitridation at 800°C to 850°C for 3 h.
研究领域:
冶金工程
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材料科学
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产品关联
DOI
高影响因子
Metals
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2020
·Vol. 10
·期 3
·356
·
IF 2.117
Yongjie Liu,Yue Wang,Zhixiong You,Xuewei Lv
The steel micro-alloyed with ferrovanadium nitride has extremely superior properties that make it widely utilized in structural components, construction and aircraft. The conventional methods for synthesizing ferrovanadium nitride include nitridation of pure ferrovanadium alloy or carbothermal nitridation of metallic oxides, using nitrogen or ammonia gas as nitrogen sources. In this study, ferrovanadium nitride (FeV45N) was prepared by direct reduction and nitridation of the corresponding metal oxides with ammonia as the reductant and nitrogen source. This method avoids the introduction of other impurity elements, except the negligible trace elements accompanied with the raw materials. The thermodynamics of the reduction and nitridation process were initially analyzed. During the subsequent ammonia reduction process, the FeV45N powders were successfully obtained at 1273 K for 6 h. The obtained powders were pressed into cylindrical briquettes by hot pressing (HP) at 1473 K for 1 h in vacuum. In the investigation, the X-ray diffraction and morphological analysis of the products was also carried out, and the reaction mechanisms were discussed in detail. The nitrogen content of the final product can reach 11.85 wt. %, and the residual oxygen content can be reduced to 0.25 wt. %. By sintering, the density of the alloy can reach 5.92 g/cm3.
研究领域:
材料科学
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冶金工程
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2021
·
IF 5.039
Yongjie Liu,Ran Xin,Donglai Ma,Qingqing Hu,Yue Wang,Zhixiong You
Ferrovanadium nitride, which comprises V and N, is an important alloy additive for the production of high-strength low-alloy steel. As an efficient reducing agent and nitrogen source, ammonia gas is widely used in the preparation of metal nitrides. In this study, ferrovanadium nitride alloy powder is prepared by reducing and nitriding VO 2 /Fe 2 O 3 in NH 3 –H 2 gas mixtures with different nitriding potentials. Thermodynamic analysis indicate that the reduction and nitridation of VO 2 and Fe 2 O 3 is feasible. VO 2 is converted into VN, whereas Fe and Fe 4 N can be formed depend on the reaction conditions. Lower temperatures and higher nitriding potentials are beneficial to the formation of Fe 4 N. Based on Rietveld refinement analysis, the formation of Fe 4 N and the atomic occupancy of V and N in vanadium oxynitride, which is associated with the temperature, reaction time, and nitriding potential, is determined. A ferrovanadium nitride alloy powder with an O content of 0.26 wt.% is prepared by reducing and nitriding VO 2 /Fe 2 O 3 at 900 °C for 1 h at a nitriding potential of 4.4 × 10 −3 Pa −0.5 .
研究领域:
材料科学
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冶金工程
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2025
·
IF 13.5
Yingtong Shi,Guotong Xu,Guizeng Liang,Di Lan,Siyuan Zhang,Yanru Wang,Daohao Li,Guanglei Wu
Lithium-sulfur (Li-S) batteries are regarded as one of the most promising candidates for next generation energy storage systems due to their high theoretical energy density. However, the practical application of Li-S batteries is limited by the low lithium ion (Li + ) transport efficiency and the rapid capacity decay caused by the shuttle effect. Herein, we report a composite comprising Polyethylene glycol (PEG) and vanadium nitride (VN) nanosheets coated onto a commercial polypropylene (PP) separator, called PEG-VN@PP separator. The supercatalytic effect and adsorption properties exhibited by the VN nanosheets significantly enhance the conversion of polysulfides, thereby improving both the capacity and stability of Li-S batteries. Due to the coating of PEG, Li + are attracted to the polar functional groups, enabling selective transport, which improves the transport efficiency of Li + and the rate capability of Li-S batteries. The Li-S battery assembled with PEG-VN@PP exhibits a high specific capacity of 782.0 mAh·g −1 and an average capacity decay of 0.048% per cycle at 1 C (1675 mA·g −1 ) for 700 cycles, using the carbon nanotubes/sulfur cathode with a sulfur mass loading of 1.2 mg·cm −2 .
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ziyan Yuan,Xuhui Yang,Chuyuan Lin,Peixun Xiong,Anmin Su,Yixing Fang,Xiaochuan Chen,Haosen Fan,Fuyu Xiao,Mingdeng Wei,Qingrong Qian,Qinghua Chen,Lingxing Zeng
Rechargeable aqueous zinc-ion batteries have great promise for becoming next-generation storage systems, although the irreversible intercalation of Zn 2+ and sluggish reaction kinetics impede their wide application. Therefore, it is urgent to develop highly reversible zinc-ion batteries. In this work, we modulate the morphology of vanadium nitride (VN) with different molar amounts of cetyltrimethylammonium bromide (CTAB). The optimal electrode has porous architecture and excellent electrical conductivity, which can alleviate volume expansion/contraction and allow for fast ion transmission during the Zn 2+ storage process. Furthermore, the CTAB-modified VN cathode undergoes a phase transition that provides a better framework for vanadium oxide (VO x ). With the same mass of VN and VO x , VN provides more active material after phase conversion due to the molar mass of the N atom being less than that of the O atom, thus increasing the capacity. As expected, the cathode displays an excellent electrochemical performance of 272 mAh g −1 at 5 A g −1 , high cycling stability up to 7000 cycles, and excellent performance over a wide temperature range. This discovery creates new possibilities for the development of high-performance multivalent ion aqueous cathodes with rapid reaction mechanisms.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shixian Chen,Gaohui Du,Yan Cheng,Di Han,Jiahao Deng,Yunting Wang,Huayu Li,Libing Yao,Dong Wang,Qingmei Su,Bingshe Xu
Lithium-sulfur (Li-S) batteries are poised to become the next-generation energy storage technology due to their ultra-high energy density of 2600 Wh kg −1 and the abundant reserves of sulfur on Earth. However, the practical use of Li-S batteries faces several challenges related to sulfur cathodes, including low sulfur loading, significant volumetric expansion, slow conversion kinetics, and the shuttle effect caused by polysulfides. To tackle these challenges, we have developed a hierarchical porous carbon co-doped with nitrogen, oxygen, and sulfur heteroatoms (NOSHPC) that is further loaded with monodispersed vanadium nitride quantum dots (VNQDs). This innovative combination serves as an efficient catalytic matrix to enhance charge transfer processes and facilitate the anchoring and conversion of lithium polysulfides. Moreover, we have fabricated dry-processed cathodes with ultrahigh sulfur loading by using fibrotic polytetrafluoroethylene (PTFE) as a binder, replacing the toxic solvent N-methyl-2-pyrrolidone and polyvinylidene fluoride. The dry-processed VNQDs/NOSHPC/S cathodes demonstrate a remarkable specific capacity of 1655mAh g −1 at 0.1C and achieve exceptional cycling stability, with a decay rate of only 0.0107 % per cycle over 1000 cycles at 1C with a sulfur loading of 5.2 mg cm −2 . Additionally, the pouch cells containing these dry-processed electrodes exhibit a practical areal capacity of 14.2mAh cm −2 (462 Wh kg −1 ) with a sulfur loading of up to 18.6 mg cm −2 and a low electrolyte-to-sulfur ratio of 5.3μL mg −1 . This work presents an innovative strategy for creating sulfur hosts and practical dry-processed Li-S electrodes, highlighting promising prospects for industrial application.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Guangmeng Qu,Zonghua Wang,Xixi Zhang,Shunshun Zhao,Chenggang Wang,Gang Zhao,Peiyu Hou,Xijin Xu
Extensive exploratory works are dedicating to increase the energy density of aqueous asymmetric supercapacitors (AASCs), from the perspective of augmenting the specific capacitance and widening the operating voltage window. Herein, Mxene (V 2 C) derived unique accordion-like layered vanadium nitride coated by ultrathin amorphous carbon layer (L-VN@AC) is synthesized via a facile nitride strategy as negative electrode materials for AASC. Profiting from the distinctive layered structure inherited from V 2 C, the resultant L-VN@AC electrode exhibits a more remarkable areal capacitance (631.4 mF cm −2 ) and outstanding rate capability compared to the V 2 C precursor and commercial vanadium nitride (C-VN). Furthermore, a brand-new charge matching mechanism is proposed for the assembly of AASCs with capacitive-type (pseudocapacitance/electric double layer capacitance) electrode materials to soften the impact of energy density ascribed to the capacitance gap between the asymmetrical electrodes. Based on this charge matching mechanism, an optimized L-VN@AC//α-MnO 2 AASC with 2.4 V operating voltage is assembled to achieve the enhancements in energy densities (597.5 μWh cm −2 at 2.4 mW cm −2 and 8.5 mWh cm −3 at 34.3 mW cm −3 ). It is believed that the design of high-performance L-VN@AC electrode materials and the proposal of balanced capacitance mechanism will provide new insights for the development of supercapacitors from two aspects of material synthesis and device assembly mechanism.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 15
·22486-22500
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IF 4.672
Rui Jia Liu,Ling Xu Yang,Tian Yu Zhang,Wen Jun Wang,Hui Jun Liu,Chao Liu Zeng
Summary Transition metal nitrides involving vanadium nitrides (VN) hold great prospects for alkaline metal batteries. Regrettably, the absence of environmentally friendly synthesis techniques restricts its practical applications. In this work, a rational design of nano-sheet and nano-laminar VN was reported via a facile urea nitrogenization technique. Nano-laminar VN exhibits superior electrochemical performances to nano-sheet VN as an anode for lithium-ion batteries with a discharge capacity of 381.7 mAh g −1 at 0.5 A g −1 after 400 cycles and 738.7 mAh g −1 at 0.1 A g −1 after 200 cycles without capacity attenuation. Furthermore, Li-ions storage mechanisms of nano-sheet and nano-laminar VN are pseudocapacitive accompanied by conversion reaction and intercalation pseudocapacitive, respectively.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Ying Liu,Lingyang Liu,Yongtao Tan,Lingbin Kong,Long Kang,Fen Ran
Both vanadium nitride and carbon are the important negative materials for capacitors electrodes, while effectively dispersing vanadium nitride into the surface of carbon materials would highly enhance the utilization of active materials. In this article, we find out a valid dispersion method of vanadium nitride nanoparticles into the porous carbon networks, which is derived from a synthesized block copolymer of polyacrylonitrile-b-poly[2-(methacryloyloxy)ethyl]trimethylammonium chloride-b-polyacrylonitrile together with the absorbed ammonium metavanadate. With the superiority of the designed structure, the fabricated materials are used as negative materials for capacitors electrodes and show outstanding electrochemical performance with a specific capacitance of 195.7 F/g and a prior cycle stability of 75% retention. In addition, the effect of the ratio of copolymer to ammonium metavanadate on the electrochemical performance of the product is also investigated in detail.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Qingqing Sun,Yan Lv,Xueyan Wu,Wei Jia,Jixi Guo,Fenglian Tong,Dianzeng Jia,Zhipeng Sun,Xingchao Wang
Vanadium nitride is highly desirable for their good electrochemical performance and wide work potential window, but they are cramped practical applications in supercapacitors due to poor cycling stability. Herein a combined strategy is exploited to fabricate coralloid-like nanostructure vanadium nitride/carbon (VN/C) via a facile hydrothermal method . The structural characterization displayed that nano-VN was uniformly distributed in the carbon scaffold materials to improve the electrode behavior. Those composites exhibited a wide voltage window of −1.1 to 0 V with a specific capacitance of 385 F g −1 at 1 A g −1 , and exceptional cycling stability (88.9% retention after 10000 cycles). The two-electrode system based on VN/C electrodes obtains a high energy density of 24.2 Wh kg −1 at a power density of 1050 W kg −1 . The device also shows perfect cycling stability with 93.3% capacitance retention after 10000 cycles. The coralloid-like VN/C electrode materials can be used in practical applications of the high-performance energy storage device.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Jing-Jing Lv,Zhe Li,Jiaju Fu,Wenlei Zhu
An electrochemical approach for ammonia production is successfully developed by coupling the anodic dinitrogen oxidation reaction (NOR) and cathodic hydrogen evolution reaction (HER) within a well-designed membraneless flow electrolyzer. The obtained reactor shows the preferential yield of ammonia over nitrogen oxides on the vanadium nitride catalyst surface. At an applied oxidation potential of 2.25 V versus the reversible hydrogen electrode (vs RHE), a promoted ammonia production rate and Faradaic efficiency (FE) were obtained with 9.9 mmol g −1 h −1 (0.029 mmol cm −2 h −1 ) and 4.8%, respectively. Besides, the negative affection of ammonia contamination is efficiently alleviated. Density functional theory calculations revealed that the thermodynamic energy needed to produce ammonia (−0.63 eV) is far lower than that of producing nitrogen oxide (0.96 eV) from hydrogenated nitrogen oxides [∗N 2 OH] splitting, confirming the coupling of NOR and HER.
研究领域:
电化学工程
·
催化科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）