JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Li Huiting,Long Jun,Huang Wenheng,Liu Xiyang,Li Jinchao,Chen Liang,Chen Qin,Liang Qianqian,Chen Jijun,Zhang Yaping
The polybenzimidazole membrane has a low proton conductivity, and its trade-off effect between proton conductivity and vanadium ions blocking has not been addressed. Therefore, improving the proton conductivity and proton selectivity of polybenzimidazole membrane is crucial for its development in vanadium flow battery (VFB). In this work, two types of sulfonated polybenzimidazole (SPBI and HSPBI) membranes with flexible sulfoalkyl pendants are prepared by ring-opening and substitution reactions for application in VFBs. Compared with poly(4,4′-diphenylether-5,5′-bibenzimidazole) (OPBI) membrane, SPBI and HSPBI membranes exhibit remarkable proton conductivities. However, the vanadium ions blocking capabilities of SPBI and HSPBI membranes show a slight decline. Excitingly, the HSPBI membrane achieves the highest proton selectivity (1.54 × 10 6 S min cm −3 ) compared with OPBI (6.28 × 10 5 S min cm −3 ), SPBI (1.30 × 10 6 S min cm −3 ) and commercial Nafion 212 (0.43 × 10 5 S min cm −3 ) membranes. Lastly, all membranes are separately assembled into VFBs to verify their battery performances. The HSPBI membrane shows higher Coulomb efficiencies (94.74–99.41%) and energy efficiencies (67.49–83.55%) compared of OPBI, SPBI and Nafion 212 membranes at 80–280 mA cm −2 . Remarkably, the 500 VFB cycles of HSPBI membrane at 140 mA cm −2 are also stably executed, which shows excellent structural stability. Therefore, the HSPBI membrane has a promising potential for VFB application.
研究领域:
储能
·
高分子科学
·
电化学
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Chem
·
2023
·
IF 23.5
Ran Luo,Sai Chen,Xin Chang,Jiachen Sun,Zhi-Jian Zhao,Jinlong Gong
Redox chemistry plays an important role in the precise production of targeted valuable chemicals. However, achieving accurate control of the redox process still lacks the guidance of mechanistic insight. This paper describes how doping can enhance redox performance of vanadia for chemical looping oxidative propane dehydrogenation. By elucidating the dynamic redox process of vanadia, we discovered that molybdenum (Mo) dopant lowers the phase transformation barrier from defective V 2 O 5 toward VO 2 . In the VO 2 phase, Mo doping modulates chemical properties of every oxygen atom, while doping in V 2 O 5 only affects the oxygen atoms that directly bond with the dopants. Charge analysis indicated that the conductive nature of VO 2 delocalizes charge within the lattice and alters the overall chemical properties. Experiments confirmed that Mo-doped VO 2 is the dominant phase during the redox process, exhibiting the best catalytic performance. Hence, delocalization could be key to future chemical applications of efficiently doped materials.
研究领域:
材料化学
·
催化化学
·
物理化学
·
无机化学
·
能源化学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Ying Liu,Xiaohan Jiang,Xiuping Li,Xingchao Wang,Bao Liu,Yinglun Sun,Zhaoyang Wang,Hengxiang Li,Lingyang Liu
Hydrated vanadates have gained significant attentions as cathode for aqueous zinc-ion batteries (AZIBs) on account of their broad open channels in the structural framework together with the existence of crystal water for stabilizing the structure. Yet, the lower electronic conductivity and the dissolution of vanadium in the electrolyte both affect the specific capacity and stability. In this work, we successfully prepared a unique hydrated zinc pyrovanadate Zn 3 (OH) 2 V 2 O 7 ·(H 2 O) 2 with broad tunnel structure through a hydrothermal method . The carbon encapsulation strategy was then used to enhance its specific capacity, rate performanc and cycle stability in AZIBs. Further, the cycle stability was improved using a highly concentrated ZnWiS electrolyte capable of inhibiting vanadium dissolution, and improved the cycling time from one month to one year at low current densities with high capacity retention rate. Additionally, the electrochemical performances under high-temperature conditions of 50 °C and 80 °C are also investigated. It is found that an increase in temperature can promote the ionic conductivity of the electrolyte and the kinetics of electrode reactions , thus accelerating charge transfer. Due to the excellent high-temperature resistance of the ZnWiS electrolyte, the assembled AZIBs both achieved calendar-level cycle life at 50 °C and 80 °C. These excellent results demonstrate that the dual-strategy approach of carbon encapsulation to enhance the conductivity and high concentration electrolyte to inhibit vanadium dissolution provides technical support to promote the application of AZIBs in large-scale energy storage devices.
研究领域:
能源存储
·
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 26
·期 2
·801-811
·
IF 2.289
Dai Jicui,Zhang Hongqiang,Sui Zhaobin,Hu Huili,Gao Peng,Zhu Yongming,Dong Yichao,Teng Xiangguo
In order to reduce the vanadium ion permeability while still keep its high stability, atom radical polymerization (ATRP) method was used to introduce zwitterionic sulfobetaine methacrylate (SBMA) onto the Nafion matrix in homogenous solution. The Nafion-grafted poly SBMA (N-g-PSBMA) solution was then used to blend with common Nafion solution to prepare Nafion/Nafion-g-PSBMA (N/N-g-PSBMA) amphoteric membranes by solution casting method. The grafted resins and membranes were characterized by attenuated total reflectance Fourier transform infrared spectra (ATR-FTIR), energy dispersive X-Ray spectroscopy (EDX), scanning electron microscopy (SEM), and water-contact angle analysis. The results prove that the SBMA has been successfully grafted onto the Nafion backbones. Furthermore, the N/N-g-PSBMA membranes have shown higher ion selectivity, coulombic efficiency, and energy efficiency than that of pure recast Nafion (r-Nafion) membrane for VRB application. At the current density of 40–80 mA cm −2 , the average energy efficiency of the VRB with N/N-g-PSBMA-20% membrane has reached up to 84.9%, which is 4.2% higher than that of the VRB with the r-Nafion membrane at the same current densities. Moreover, the 100-cycles charge-discharge test proves that the N/N-g-PSBMA-20% membrane possesses higher stability and capacity retention ability than that of r-Nafion membrane, confirming the great potential of such membranes for VRB application.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Weiduo Zhao,Zhongwei Zhao,Yingpeng Xu,Ziming Cao,Tianyu Zhao
High-chromium vanadium slag, a typical hazardous solid waste, serves as a critical raw material for the comprehensive utilization of vanadium and chromium resources. To achieve synergistic recovery of vanadium and chromium, this study proposes an innovative process based on mineral phase reconstruction. A ternary eutectic multi-reaction system was established, and a novel Na 2 CO 3 -CaO co-roasting-leaching method was developed to enable selective separation of V and Cr. Combining DFT calculations, pure mineral roasting experiments, and actual vanadium slag roasting validation, the transformation mechanisms were elucidated: vanadium was converted into water-insoluble NaCaVO 4 and CaVO 3 , while chromium existed as water-soluble Na 2 CrO 4 during the Na 2 CO 3 -CaO co-roasting process. Under optimized conditions (roasting temperature 900 °C, duration 90 min, molar ratio n(CaO)/n(Na 2 CO 3 ) = 1), the average leaching efficiencies reached 84.23 % for Cr in the first-stage water leaching and 86.52 % for V in the second-stage ammonium bicarbonate leaching. The Cr concentration in the water leaching solution was 4.1 g/L (V: 0.7 g/L), whereas the V concentration in the ammonia leaching solution significantly increased to 7.1 g/L (Cr: 0.8 g/L). Impurity ions (Fe, Mn, Ti, Si) in both leaching solutions remained below 0.05 g/L. The remarkably low impurity levels substantially reduced purification costs, and the distinct concentration differences between V and Cr highlighted the selective separation advantages of the proposed process. These integrated characteristics provide critical feasibility support for industrial-scale implementation.
研究领域:
冶金工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Junyi Xiang,Xi Lu,Hongru Rao,Luwei Bai,Qingyun Huang,Xuewei Lv
The separation of vanadium and chromium from vanadium-chromium slag constitutes the greatest bottleneck in the exploitation and utilization of high-chromium vanadium-titanium magnetite, which mainly results from the insufficient understanding of the behavior of similar elements vanadium and chromium during the extraction process. In this research, a series of spinels FeV x Cr 2- x O 4 (0 ≤ x ≤ 2) were synthesized via the high-temperature solid-state method, and their sodium roasting and leaching behavior were comprehensively analyzed. The transformation rules of sodium vanadate and chromate were investigated by XRD, SEM-EDS, FTIR, and thermodynamic calculation. The results indicate that in the FeV x Cr 2- x O 4 (0 ≤ x ≤ 2) − Na 2 CO 3 system, at 300°C, a portion of chromium spinel phase is preferentially and slowly oxidized to Cr 2 O 3 , while the vanadium spinel rapidly oxidizes to form NaVO 3 at 400°C. Above 500°C, NaVO 3 further reacts with Na 2 CO 3 to form Na 4 V 2 O 7 , and Na 2 CrO 4 also begins to form concurrently. As the proportion of Cr in FeV x Cr 2- x O 4 increases, both the leaching efficiencies of vanadium and chromium from the sodium-roasted samples decrease, with the leaching efficiency of chromium decreasing more significantly. Significant competitive and synergistic effects between vanadium and chromium are observed in the roasting of FeV x Cr 2- x O 4 with Na 2 CO 3 . This study is expected to provide theoretical support for the development of efficient vanadium-chromium extraction processes.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Biao Yuan,Fujin Sun,Pingting Chen,Kunpeng He,Pan Wu,Changjun Liu,Jian He,Wei Jiang
With the development of vanadium redox flow battery technology, the demand for pure vanadium is rapidly increasing. The separation of vanadium from vanadium–chromium leaching solutions are critical step in the production of purity-vanadium. This study presents an innovative adsorption process that utilizes amorphous ZrO 2 (AZrO) for the selective separation of V(V) and Cr(VI). In this process, a high adsorption capacity for V(V) at 64.5 mg·g –1 was achieved, while the capacity for Cr(VI) is relatively low at 24.1 mg·g –1 , demonstrating good separation performance. This is mainly caused by the large specific surface area and mesoporous structure, which are favorable for molecular diffusion and mass transfer. The kinetic analysis shows that the adsorption process follows pseudo-second-order kinetic process with chemisorption being the rate-controlling process. AZrO showed excellent separation performance in mixed solutions over a wide range of concentrations. After five cycles, AZrO retained over 73% of its capacity, indicating good stability. In mixed solutions containing up to 40 g·L –1 of V(V) and 3 g·L –1 of Cr(VI), the innovative adsorption process successfully achieved effective separation and purification. By an adsorption–desorption process using 0.1 mol·L –1 NaOH, a 99.02% V(V)-rich solution was obtained from a high concentration sodium vanadium slag leaching solution, demonstrating its effectiveness for practical industrial applications.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Huayi Tan,Yinling Liu,Bingqiang Fan,Ke Xu,Shili Zheng,Yang Zhang
The deep separation of molybdenum (Mo), vanadium (V), and nickel (Ni) from acid-leaching solutions has received increasing attention because of the high value of Mo, V and Ni materials. In this study, an efficient strategy is proposed to separate Mo, V, and Ni from an acidic solution that contains iron (Fe). This strategy controls the ion species by adjusting the valence state of the metals to separate them via two stages: selective solvent extraction and oxidation precipitation. In the first stage, more than 99.0 % of the Mo in the form of molybdenum blue species as the anion ion was extracted by the tertiary amine N235, and V, Ni, and Fe (both as the cation ions) remained in the raffinate under the reduced environment. The high-purity product of Mo was then prepared by stripping and precipitation. The mechanism by which Mo selectively extracted was revealed by Fourier transform infrared spectroscopy, and the special anion [Mo (VI) 2 Mo (V) 4 O 18 ] 6- of molybdenum blue species was confirmed to exist in the Mo-loaded extractant. In the second stage, the reduced V(VO 2+ ) and Fe (Fe 2+ ) were transformed into the forms of polyvanadate ions (in the + 5 state) and Fe 3+ to precipitate them in the forms of sodium vanadate and iron vanadate from the solution that contained Ni, by adding oxidating agent and controlling the solution pH. The results shown that 96.88 % of V and 98.98 % of Fe could be precipitated under the pH was 3, and the mechanisms of V and Fe precipitation were determined by characterization of the precipitates subsequently. On the basis of ion species control, the goal of Mo, V, and Ni separation could be achieved by the selective extraction of N235 and oxidation precipitation.
研究领域:
冶金化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Tao Wang,Xiqing Liu,Donglai Han,Changchang Ma,Maobin Wei,Pengwei Huo,Yongsheng Yan
This work focused on the utilization of biological extract for the preparation of lignin-based carbon composites materials and used in the field of photocatalysis . A straightforward one-step carbonization way has been developed to prepare vanadium-doped lignin-based carbon/Bi 2 O 3 composites photocatalyst by using sodium lignosulfonate as the carbon source and catalyst. The application of lignin as the carbon source to form photocatalyst support tends to control the uniform distribution. At the same time, sodium lignosulfonate as the catalyst could break down the BiVO 4 during carbonization process. A series of characterizations demonstrated the BiVO 4 was transformed into Bi 2 O 3 and vanadium-doped lignin-based carbon. The possible synthesis process was proposed. Moreover, the novel V-doped carbon/Bi 2 O 3 composites photocatalyst displayed higher photocatalytic activity than bare BiVO 4 . A possible photocatalytic mechanism was also discussed. This work provided new insight into the lignin-based carbon materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HYDROMETALLURGY
·
2012
·
IF 2.027
Wang Li,Yimin Zhang,Tao Liu,Jing Huang,Yi Wang
Leaching of roasted stone coal with sulfuric acid results in a mixed vanadium solution containing Fe(III), Fe(II), Al(III) and Mg(II). Separation of V from synthetic sulfate solution containing these impurities has been investigated by ion exchange and solvent extraction . In ion exchange experiments, anion exchange resin ZGA414 was tested as its optimum adsorption capacity compared with D202, D453, D301FC and ZGA351 resins, and D2EHPA and TBP diluted with kerosene were employed in solvent extraction. Ion exchange tests indicated that only V(V) was loaded from the synthetic solution at pH > 1.5, while it was difficult to separate V(V) from Fe(III), which also made resin toxic. Solvent extraction experiments revealed that V(IV) had a better extraction ratio than that of V(V), while Fe(III) had a serious effect on the extraction of V(IV). The co-extraction ratio of Al(III) and Mg(II) can be decreased by controlling their concentrations lower than 10 g/L. Counter-current experiments with D2EHPA presented that 99% of V(IV) was extracted from the real leach solution after reduction process, leaving most of Fe(II), Al(III) and Mg(II) in the raffinate.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Guozhi Zhang,Desheng Chen,Wei Zhao,Hongxin Zhao,Lina Wang,Dan Li,Tao Qi
A selective synergistic extraction process for recovering vanadium (V) from the high-acidity chloride leaching liquor was proposed. Vanadium (V) extraction from the simulated high-acidity leaching liquor with numerous impurities using a mixed extractant consisting of tricaprylmethylammonium chloride (Aliquat 336) and tri-n-butyl phosphate (TBP) was studied while obvious synergism was found. According to synergistic enhancement coefficient and physical property of organic phase, the suitable extractant composition was the volume ratio of Aliquat 336 to TBP 1:4. The vanadium (V) extraction increased sharply as HCl concentration increased from 1.01 mol/L to 4.13 mol/L. Under the optimum extraction conditions (extractant concentration of 50 vol%, 1 min, 25–30 °C, and phase ratio (O/A) of 1:1), the vanadium extraction with three stages was above 90.0%. Almost no other impurity ions, such as Ca, Al, Mg, Cr, Ti, Mn, and Si, were co-extracted. Under the optimum stripping conditions, the vanadium stripping was above 92.0% in a single stage using water as the effective stripping reagent. High-quality V 2 O 5 product was obtained after precipitation and calcination . The mechanism of vanadium (V) extraction by Aliquat 336–TBP mixed extractant was discussed based on the analysis of FT-IR and UV–vis spectra.
研究领域:
冶金学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 7
·5204-5215
·
IF 2.599
Teng Xiangguo,Yu Cong,Wu Xiufen,Dong Yichao,Gao Peng,Hu Huili,Zhu Yongming,Dai Jicui
How to solve the crossover of vanadium ions through ion exchange membrane is a key issue in vanadium redox flow battery (VRB), especially for ultra-thin membranes used for VRB to obtain a lower cell resistance. Herein, an ultra-thin (~ 30 μm) PTFE/SPEEK [polytetrafluoroethylene/sulfonated poly(ether ether ketone), P/S] membrane is successfully prepared and modified by using layer-by-layer (LBL) self-assembly technique with polycation poly(diallyldimethylammonium chloride) (PDDA) and polyanion poly(sodium styrene sulfonate) (PSS). P/S membranes are alternatively immersed in positively and negatively charged polyelectrolyte to form 2 to 8 bilayers onto its surface. Consequently, a series of P/S-[PDDA/PSS]
n
( n is the number of multilayers) membranes are fabricated. Both the physicochemical properties and VRB performances of the P/S-[PDDA/PSS]
n
membranes are then investigated in detail. Results show that the ion selectivity of the P/S-[PDDA/PSS]
n
membranes is much higher than that of pristine P/S membrane, especially for P/S-[PDDA/PSS] 6 membrane. As a result, the VRB with the P/S-[PDDA/PSS] 6 membrane exhibits the highest coulombic efficiency (CE) of 96.5% at 80 mA cm −2 , the highest voltage efficiency of 94.7% at 40 mA cm −2 and the highest energy efficiency of 87.7% at both 40 and 50 mA cm −2 , respectively. In addition, 80 times charge–discharge test proves that the P/S-[PDDA/PSS] 6 membrane possesses high stability and no obvious CE decay after running. All the results show that the LBL technique is an effective way to prepare ultra-thin membrane with high ion selectivity for VRB application.
研究领域:
电化学
·
能源材料
·
膜科学
·
储能技术
·
高分子材料
·
电化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）