JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yuxuan Zheng,Weiyi Xu,Yulin Wu,Jingyi Ding,Haowei Yu,Xinze You,Yixing Wang,Zhi Xu
Researchers have attempted to introduce imidazole groups into sulfonated polyimide (SPI) to create acid–base interactions, which could effectively improve the physicochemical properties of membranes. However, the strong alkalinity of imidazole groups makes the deprotonation process difficult, thereby impeding the proton transport process. Herein, electron-withdrawing benzoyl groups was introduced by a cross-linking process to regulate the acid-base interactions, which successfully reduced the alkalinity of benzimidazole group, thereby reinforcing proton conduction. Meanwhile, the dense structure formed on the membrane effectively reduce the vanadium ion permeability. SPI membranes with a cross-linking time of 10 min exhibited low vanadium ion permeability (1.38 × 10 −7 cm 2 min −1 ) and the highest proton conductivity of 76.0 mS cm −1 , achieving the superb stability for 1500 cycles with the highest EE of 83.9 % at 120 mA cm −2 . This work offers a facile approach to solve the trade-off issue between proton conductivity and vanadium ions permeability for SPI-based proton exchange membranes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Jingjing Pan,Shuanjin Wang,Min Xiao,Michael Hickner,Yuezhong Meng
Sulfonated poly(fluorenyl ether ketone) (SPFEK) membranes were modified with layered proton conductors zirconium phosphate sulfophenylenphosphonates (ZrPSPP) to improve the proton conductivity and mitigate vanadium ions crossover. The effects of ZrPSPP filler loading on the microstructure and chemical–physical property of SPFEK/ZrPSPP composite membranes as well as the vanadium redox flow battery performance are reported. The uniform dispersion of ZrPSPP sheets in the SPFEK matrix is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX). Since the sulfonic acid groups on the aromatic main-chains are less flexible, the proton channels in the pristine SPFEK membranes are relatively narrow and not well connected. The intensive sulfonic acid groups on ZrPSPP fillers increase the water uptake and the hydrophobic/hydrophilic microphase separation of the composite membranes, resulting in improved proton conductivity. The impermeable nanoplates demonstrate to be a potential physical barrier for vanadium ion diffusion. The VRB assembled with the SPFEK/5 wt%ZrPSPP composite membrane shows longest discharge time and maximal coulombic efficiency among VRBs using the pristine SPFEK and other hybrid SPFEK/ZrPSPP and Nafion 117 membranes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
WASTE MANAGEMENT
·
2024
·
IF 7.1
Jing Gao,Wenchao Lu,Yujiang Li,Tao Wu
This article employs six organic acids to selectively dissolve Mo, Ni and V from spent catalysts, and the most effective acid is identified. Then, the effects of key leaching parameters, including acid concentration, temperature, and S/L ratio, on metal leaching are systematically explored to determine the leaching mechanism. The results demonstrate that the leaching ability of organic acids followed the order: oxalic acid > citric acid > tartaric acid > malonic acid > acetic acid > formic acid. The leaching process of metals was jointly influenced by acidolysis and complexolysis. Among them, more than 93.07 % of Mo, 86.64 % of V, and 74.21 % of Ni were selectively leached with oxalic acid at the optimum condition: S/l: 1/20, oxalic acid: 1.0 mol/L, temp: 60 °C. From the correlation coefficients, the resulting activation energies, and n values, it was demonstrated that Mo and V followed the Avrami dissolution reaction model, V leaching was controlled by the diffusion mode, and Mo leaching was controlled by a mixed mode of chemical reaction and diffusion. The dissolution behavior of both metals consistently adhered to the linear trend of the Avrami kinetic model under varying S/L ratios and oxalic acid concentrations.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Guojun Liu,Shaoshuai Wang,Caiming Zhou,Qiang Zhao,Jiaxue Hu,Zhenzheng Gui,Yuhui Chen,Yong Huang,Peng Zhang,Fenfen Wang
Formic acid is a versatile and promising value-added chemical derived from the chemoselective transformation of renewable biomass resources. However, achieving a high production rate of formic acid remains a pivotal and enormous challenge. Herein, we synthesized a sequence of BiVO x catalysts based on vanadium-promotion by a facile and cost-effective strategy for selective oxidation of biomass-derived xylose in water under O 2 atmosphere. Particularly, the resultant Bi 1 V 2 O x exhibited a remarkably enhanced catalytic activity, higher selectivity toward formic acid, and excellent recyclability, giving a yield of 75.8 % and a production rate of formic acid (9.22 mol FA mol V −1 h −1 ) at 170 °C within only 20 min. Such pronounced improved performance was largely attributed to the synergistic effect between V and Bi species, with higher surface area, abundant surface acidity, as well as stronger adsorption energy, meanwhile efficiently suppressing the formation of undesired by-products. This study demonstrates that the promotion of V in BiVO x leads to more efficient catalytic oxidation of xylose to formic acid, and with further driven research that proved great potential for generating formic acid from renewable biomass resources for future industrial application.
研究领域:
化学工程
·
可再生资源转化
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Jun-Feng Qin,Jia-Hui Lin,Tian-Shu Chen,Da-Peng Liu,Jing-Yi Xie,Bao-Yu Guo,Lei Wang,Yong-Ming Chai,Bin Dong
Adjusting the intrinsic activity and conductivity of electrocatalysts may be a crucial way for excellent performance for water splitting. Herein, the rational design of vanadium element doped cobalt phosphide (V-doped CoP) nanoparticles has been investigated through a facile gaseous phosphorization using cobalt vanadium oxide or hydroxide (Co-V hydr(oxy)oxide) as precursor. The physical characterization shows that the homogeneous dispersion of V element on V-doped CoP nanoparticles have obtained, which may imply the enhanced electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The electrochemical measurements of the prepared V-doped CoP in alkaline electrolyte demonstrate the superior electrocatalytic activity for both HER (overpotential of 235 mV@10 mA cm −2 ) and OER (overpotential of 340 mV @10 mA cm −2 ). Further, V-doped CoP nanoparticles used as anode and cathode simultaneously in a cell require only 370 mV to achieve a current density of 10 mA cm −2 . The outstanding electrocatalytic activity may be ascribed to the improved conductivity and intrinsic activity owing to phosphating and the doping of V element. In addition, the long-term stability of V-doped CoP has been obtained. Therefore, metal doping into transition metal-based phosphides may be a promising strategy for the remarkable bifunctional electrocatalyst for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yun Guo,Hong-Yi Li,Shuo Shen,Jie Cheng,Jiang Diao,Bing Xie
Chromium sludge is a hazardous solid waste which cannot be effectively treated but only piled up and abandoned, causing serious environment pollution and resource wasting. This work proposes an effective novel process to separately recover all resources in chromium sludge via a sustainable way. The obtained acid solving liquid from chromium sludge is desiliconized by cationic flocculant (PCAM) to induce coprecipitation of polysilicate gel and PCAM , which mixture is calcinated to generate the product of white carbon black in purity of 94.35% with a recovery of 92.58%. After desiliconization, V in the solving liquid is selectively extracted by microemulsion (ME), which is recovered as V 2 O 5 in purity of 99.34% with a recovery of 95.53% by the subsequent procedure of stripping-precipitation-calcination. The Fe 3+ in raffinate is reduced to Fe 2+ cations by Na 2 SO 3 , and is then recovered by H 2 C 2 O 4 precipitation to generate the FeC 2 O 4 product in purity of 99.12% with a recovery of 98.25%. Cr 3+ cations in residual solution are recovered by alkaline precipitation and calcination to generate the Cr 2 O 3 product in purity of 98.25% with a recovery of 92.68%. This work provides fresh penetrations into the synchronous detoxification, resource recovery and value-added utilization of hazardous industrial solid wastes.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhuoyang Li,Yang Zhang,Guishang Pei,Mengjiao Jiao,Xuewei Lv
MnV 2 O 6 and Mn 2 V 2 O 7 are essential compounds in the manganese salt roasting process for extracting vanadium and serve as excellent battery materials. Determining their thermodynamic properties is of significant theoretical and practical importance. In this study, MnV 2 O 6 and Mn 2 V 2 O 7 were synthesized through solid-state synthesis under a nitrogen atmosphere, and their crystal structures were analyzed using X-ray powder diffraction. The heat capacity of MnV 2 O 6 and Mn 2 V 2 O 7 were measured using relaxation calorimetry over the temperature range of 2–300 K. The entropy at 298.15 K, including magnetic contributions, was calculated as 178.99 ± 5.35 J K -1 ·mol -1 for MnV 2 O 6 and Mn 2 V 2 O 7 for 258.93 ± 6.47 J K -1 ·mol -1 . The standard molar enthalpies of formation were determined using high-temperature solution calorimetry in a molten lead borate solvent, yielding -1997.09 ± 23.97 for MnV 2 O 6 and -2427.71 ± 29.12 kJ mol -1 for Mn 2 V 2 O 7 from their element references. Based on these reliable experimental data, other thermodynamic properties, including enthalpy changes, entropy, and Gibbs free energy, were calculated. Finally, thermodynamic simulations were conducted to analyze phase evolution during the manganese salt roasting process and to evaluate the water solubility of MnV 2 O 6 and Mn 2 V 2 O 7 .
研究领域:
材料科学
·
热力学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Hongyan Zhang,Xuehan Yang,Hua Wang,Yikai Wang,Ranran Li,Heye Fu,Hao Zhou,Dan Wu,Pan Yuang,Maoshuai He,Wenxian Wei,Tao Yang
Hydrogen has long been widely recognized as a promising carbon-free fuel with potential to tackle energy and environmental challenges owing to its high energy density and cleanliness. Water electrolysis offers an environmentally friendly method for hydrogen production from water and largely depends on the efficiency of electrocatalysts. Molybdenum diselenide (MoSe 2 ) has been regarded as one of the most promising earth-abundant and cost-effective catalysts for hydrogen evolution reaction (HER). Nevertheless, its catalytic activity has thus far remained below expectations. In this research, we introduce a vanadium-modulated Ni-MoSe 2 catalyst (NiV-MoSe 2 ), demonstrating outstanding catalytic performance towards HER with an overpotential of 74.5 mV at 10 mA cm −2 and a Tafel slope of 56.2 mV dec −1 . The enhancement of catalytic performance is highly likely attributed to the dual doping of vanadium and nickel. As a result, the intrinsic activity, electrochemical active surface area, and conductivity are significantly improved. These findings enable the NiV-MoSe 2 catalyst to be an exceptionally competitive alternative to noble metal-based catalysts, and may stimulate further studies in designing efficient HER catalysts through multi-heteroatom substitution.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Hai-Wen Li,Xi Wang,Liqing He,Jing Huang,Yongtao Li,Wanggang Fang,Tengfei Cheng,Xiao Li,Xinghai Ren,Xiaoliang Liu,Defu Nie,Huai-Jun Lin
TiMn-based AB 2 -type hydrogen storage alloy with low cost, relatively suitable platform pressure, and high hydrogen storage capacity, stands out as one of the most promising candidates for practical applications in hydrogen storage. However, the TiMn-based alloy gradually losses activity, especially during prolonged exposure to air, posing challenges for activation and greatly increasing the operation cost in large-scale application. The LaNi 5 alloy exhibits excellent initial activation performance, making it an ideal additive to enhance the initial reaction kinetics of TiMn-based AB 2 -type alloy. Nevertheless, the introduction of LaNi 5 tends to reduce the hydrogen storage capacity of the mother alloy. Vanadium (V) possesses a relatively high hydrogen storage capacity (3.8 wt.%), and its addition can enhance the hydrogen storage capacity of the mother alloy. In this study, we employ a co-doping strategy, using 5 wt.% of LaNi 5 and 5 wt.% of V, to activate an inactive TiMn-based AB 2 -type alloy (placed for 1 year in air). This approach not only enhances the initial reactivity of the TiMn-based mother alloy but also restores its high-capacity performance. At 303 K and 6 MPa H 2 pressure, the co-doping alloy (90 wt.% TiMn-based alloy - 5 wt.% LaNi 5 - 5 wt.% V) demonstrates a substantial increase in initial hydrogen absorption rate, achieving a hydrogen absorption capacity of 1.61 wt.% in 6 min. The maximum hydrogen absorption capacity reaches 2.00 wt.% in 90 min. After 5 and 20 cycles, it maintains a reversible capacity of 1.55 and 1.45 wt.%, respectively. The outstanding hydrogen storage performance is attributed to the formation of multiphase alloys, as evidenced by X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) measurements. The reaction enthalpy (Δ H ) of the co-doping alloy is calculated as 34.1 kJ/(mol H 2 ), a value suitable for operation at room temperature. This work supplies an efficient strategy for the activation of long-time placed inactive hydrogen storage alloys and the enhancement of their hydrogen storage performance, and avoids the waste of raw materials due to inactivation in air. The achievements shed lights on the regeneration of inactive alloys and the cost control in the case of large-scale application of solid hydrogen storage alloys.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SOLVENT EXTRACTION AND ION EXCHANGE
·
2014
·
IF 1.66
Ju-hua Zhang,Wei Zhang,Li Zhang,Song-qing Gu
In the V2O5 production process, purification of vanadium-bearing solution plays an important role in determining the quality of the final product. The choice of purification method depends on the vanadium species, aqueous media, and associated impurities. In this review, the recent research results for the separation and recovery of vanadium from leaching solution with solvent extraction, ion exchange, and chemical precipitation separation are presented. The effects of the main operational parameters on the efficiency of purification with these three methods are compared and discussed respectively, and several problems existing in these processes are proposed.
研究领域:
冶金工程
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2011
·Vol. 52
·期 23
·5312-5319
·
IF 3.829
Dongyang Chen,Shuanjin Wang,Min Xiao,Dongmei Han,Yuezhong Meng
High-molecular-weight bulky-block poly(fluorenyl ether thioether ketone)s were successfully synthesized by a two steps one-pot protocol using N,N′ -dimethy- S -carbamate masked dithiols for vanadium redox flow battery (VRB) application. The followed sulfonation procedure gave birth to novel sulfonated block poly(fluorenyl ether thioether ketone)s (SPFETKs) with controlled ionic exchange capacities (IEC). Membranes with proton conductivities higher than (IEC > 1.66 mequiv. g −1 ) or comparable to (IEC < 1.66 mequiv. g −1 ) that of Nafion117 membrane were achieved. The VO 2+ permeabilities of SPFETKs membranes were much lower than that of Nafion117 membrane. The thermal properties, mechanical properties, oxidative stability , water uptake, proton conductivity, VO 2+ permeability and cell performance were investigated in detail.
研究领域:
高分子化学
·
能源材料
·
电化学
·
膜科学与技术
·
功能高分子
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Wenjie Liao,Ling Zhou,Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
Both improving the activity and reducing SO3 emissions during selective catalytic reduction of NOx by the NH3 (NH3–SCR) process over commercial V–Ti-based catalysts remain a challenge. Herein, Ce and P cooperatively modified the VMo/Ti catalyst to address this challenge. Within the temperature range of 250–350 °C, the optimal VMoCeP/Ti catalyst achieved a NO conversion of more than 95% and maintained a SO2 oxidation ratio below 1.0%. The enhanced SCR activity of the modified catalyst could be attributed to the improvement in surface acidity and redox capacity by the addition of Ce and P, which would promote NH3 adsorption and activation. Meanwhile, Ce and P coaddition could regulate the surface structure of vanadyl species from predominantly polymeric to a more dimeric form, which could also promote the SCR reaction. More importantly, except for the suppressed sulfation of vanadium species, both a lower proportion of polymeric vanadyl species and the strong interactions among V–Ce–P species could raise the energy barrier of the decomposition of sulfated vanadium species into SO3, thereby inhibiting SO2 oxidation. This work provided novel insights into developing efficient SCR catalysts with low SO2 oxidation ratios for both the academic and industrial fields.
研究领域:
催化化学
·
环境化学
·
材料科学
·
化学工程
✓ 已验证
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）