CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Peng-Xing Xie,Qing-Yuan Zhao,Haojie Dong,Tao Long,Meng-Sha Ding,Bin Xie,Xiao-Feng Wang,Wei Ling,Mengting Liu,Xiong-Wei Wu,Peng-Fei Wang,Xian-Xiang Zeng
Delivery of high energy density in polyanion compound-Na 3 V 2 (PO 4 ) 3 based on three-electron redox is still challenging because of their controversial multi-electron reaction mechanism and unsatisfactory electrochemical reversibility. Herein, the reversible V 4+ /V 5+ redox ( ca. 4.0 V) could be successfully activated in Na 4 VFe(PO 4 ) 3 cathode material through a Na-rich strategy, demonstrating a reversible specific capacity of 154.7mAh g −1 at 0.1C and 90.3mAh g −1 after 800 cycles at 20C, with 80 % of the initial capacity retained. The entire electrochemical reaction undergoes a highly recoverable phase transition by in-situ X-ray diffraction. Impressively, the Na-rich strategy could not only allow Na2 site to be occupied to activate the V 4+ /V 5+ redox pair confirmed by X-ray absorption near-edge structure spectroscopy, but also enable Na + transportation across the generated vacancies rather than synergistic Na + diffusion. This work provides rational design strategy of multi-electron transfer reaction in high-energy sodium-ion batteries.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yuxiang Chen,Xiangyue Liao,Peng Wang,Ji Chen,Xiaoqin Zhang,Xingqiao Wu,Sean C. Smith,Dunmin Lin,Xin Tan,Qiaoji Zheng
The stable three-dimensional framework and high operating voltage of sodium superionic conductor (NASICON)-type Na 3 V 2 (PO 4 ) 3 has the potential to work with long cycle life and high-rate performance; however, it suffers from the poor intrinsic electronic conductivity and low energy density . Herein, Ga 3+ is introduced into Na 3 V 2 (PO 4 ) 3 to activate the V 4+ /V 5+ redox couple at a high potential of 4.0 V for enhancing energy density of the materials (Na 3 V 2-x Ga x (PO 4 ) 3 ). After the partial substitution of Ga 3+ for V 3+ , three redox couples (V 2+ /V 3+ , V 3+ /V 4+ and V 4+ /V 5+ ) of V are reversibly converted in the voltage range of 1.4–4.2 V, suggesting multi-electrons (>2e − ) involved in the reversible reaction, and simultaneously the electronic conductivity of the materials is effectively enhanced. As a result, the cathode with x = 0.75 exhibits excellent electrochemical properties: in the voltage range of 2.2–4.2 V, delivering an initial capacity of 105 mAh/g at 1C with a capacity retention rate of 92.3% after 400 cycles, and providing a stable reversible capacity of 88.3 mAh/g at 40C; and in the voltage range of 1.4–4.2 V, presenting the reversible capacity 152.3 mAh/g at 1C (497.6 Wh kg −1 ), and cycling stably for 1000 cycles at 20C with a capacity decay of 0.02375% per cycle. It is found that the Na 3 V 2-x Ga x (PO 4 ) 3 cathodes possess the sodium storage mechanism of single-phase and bi-phase reactions. This investigation presents a useful strategy to enhance the energy density and cycling life of NASICON-structured polyanionic phosphates by activating high-potential V 4+ /V 5+ redox couple.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Binghao Lin,Xu Wu,Xuejie He,Jiaxin Ye,Yuqin Song,Ping Jiang,Linxuan Bai,Xiangyue Liao,Yangjie Li,Yu Huo,Qiaoji Zheng,Heng Zhang,Dunmin Lin
Na 3 V 2 (PO 4 ) 3 (NVP) with typical NASICON structure is highly regarded as one of the most appealing cathodes for sodium-ion batteries (SIBs) for their excellent structural stability; however, the poor electronic conductivity and irreversible phase transition at high voltage (∼4 V) for the material result in poor rate capabilities and significant capacity degradation during electrochemical reactions. Herein, the high-entropy doping strategy of introducing six types of metal ions into the V-sites in Na 3 V 2 (PO 4 ) 3 is used to design a high-performance cathode of Na 3 V 1.73 (Mn, Ca, Mg, Al, Zr) 0.05 Nb 0.02 (PO 4 ) 3 (HE-NVP) for SIBs. After the high-entropy doping, a reversible V 4+ /V 5+ redox pair is activated at high voltage of ∼4 V, which significantly contributes to the enhancement of energy density and operating voltage. Moreover, after high entropy doping, the single solid solution phase transition in high voltage range is induced, effectively improving the material’s structural stability and exhibiting very small volume change of 1.1 % during the Na + extraction/insertion. Based on the unique advantages mentioned above, the high-entropy HE-NVP exhibits a superior discharge capacity of 122.1 mAh g −1 at a current rate of 0.5C and maintains a remarkable capacity retention of 90.1 % after 500 cycles at a rate of 5C. This work provides a useful reference for designing advanced cathodes for SIBs by regulating high entropy doping.
研究领域:
材料科学
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电化学
·
储能技术
·
电池技术
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DOI
PubMed
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 18
·2207728
·
IF 15.1
Shibo Sun,Liwei Fang,Hui Guo,Liping Sun,Yong Liu,Yuanhui Cheng
All vanadium flow batteries (VFBs) are considered one of the most promising large-scale energy storage technology, but restricts by the high manufacturing cost of V 3.5+ electrolytes using the current electrolysis method. Here, a bifunctional liquid fuel cell is designed and proposed to produce V 3.5+ electrolytes and generate power energy by using formic acid as fuels and V 4+ as oxidants. Compared with the traditional electrolysis method, this method not only does not consume additional electric energy, but also can output electric energy. Therefore, the process cost of producing V 3.5+ electrolytes is reduced by 16.3%. This fuel cell has a maximum power of 0.276 mW cm −2 at an operating current of 1.75 mA cm −2 . Ultraviolet–visible spectrum and potentiometric titration identify the oxidation state of prepared vanadium electrolytes is 3.48 ± 0.06, close to the ideal 3.5. VFBs with prepared V 3.5+ electrolytes deliver similar energy conversion efficiency and superior capacity retention to that with commercial V 3.5+ electrolytes. This work proposes a simple and practical strategy to prepare V 3.5+ electrolytes.
研究领域:
能源化学
·
电化学工程
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产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 11
·2600-2606
·
IF 4.495
Meng Chen,Xiao-Yan Zhang,Chen-Guang Xing,Chao Zhang,Yu-Cong Zheng,Jiang Pan,Jian-He Xu,Yun-Peng Bai
Graphical Great engineering ! In this work, structurally diverse γ- and δ-lactones were efficiently stereoselectively synthesized using an engineered carbonyl reductase from Serratia marcescens ( Sm CR V4 ). Sm CR V4 exhibited improved activity and thermostability toward 14 γ-/δ-keto acids and esters compared with the wild-type enzyme, with 110-fold enhancement in catalytic efficiency ( k cat / K m ) toward methyl 4-oxodecanoate. The preparative synthesis of alkyl and aromatic γ- and δ-lactones with 95 %–>99 % ee was demonstrated. The highest space-time yield, 1175 g L −1 d −1 , was achieved for ( R )-γ-decalactone. Structurally diverse γ- and δ-lactones were efficiently synthesized stereoselectively using an engineered carbonyl reductase from Serratia marcescens ( Sm CR V4 ). Sm CR V4 exhibited improved activity (up to 500-fold) and thermostability toward 14 γ-/δ-keto acids and esters, compared with the wild-type enzyme, with 110-fold enhancement in catalytic efficiency ( k cat / K m ) toward methyl 4-oxodecanoate. The preparative synthesis of alkyl and aromatic γ- and δ-lactones with 95 %–>99 % ee and 78 %–90 % yields was demonstrated. The highest space-time yield, 1175 g L −1 d −1 , was achieved for ( R )-γ-decalactone.
研究领域:
生物化学
·
酶工程
·
有机合成
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Nianben Zheng,Xuemei Qiu,Shengqian Jin,Zhangnan Xu,Mingyu Zhou,Zexin Zhou,Tian Zhou,Zhiqiang Sun
The electrolyte employed in the vanadium redox flow battery (VRFB) is typically produced on an industrial scale through a secure and contaminant-free electrolysis process. However, the electrolysis rate is relatively sluggish, leading to elevated energy consumption. Herein, we propose a cost-effective method for electrolytic production of V(IV) electrolytes with carboxyl-functionalized multi-walled carbon nanotubes (MWCNTs-COOH) as the electrocatalyst and explore their effects on the electrolysis process. The results indicate that adding MWCNTs-COOH nanoparticles enhances the reactive sites of the electrode, thus improving the electrochemical activity of the electrolyte. The 0.1 wt% nanoparticle demonstrates the optimal catalytic performance for reducing V(V) to V(IV). Compared to the traditional electrolysis method, the proposed approach exhibits a 6.67 % increase in electrolysis rate, a 15.57 % reduction in energy consumption, and a notable relief in electrode corrosion. Furthermore, cyclic charge/discharge experiments illustrate that the prepared nanofluidic electrolyte exhibits superior performance in terms of voltage efficiency, Coulombic efficiency, energy efficiency, and discharge capacity retention. This invention offers a novel concept for vanadium electrolyte preparation, which reduces energy consumption and cost and improves the system's energy efficiency, showing great promise for practical VRFB applications.
研究领域:
材料科学
·
电化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Peifen Wang,Danyang Liu,Xiaowei An,Xuli Ma,Xiao Du,Xiaogang Hao,Abuliti Abudula,Guoqing Guan
In this study, a series of vanadium-doped MoS 2 (V-MoS 2 ) powders synthesized via a hydrothermal method were coated on nickel foam (NF) as the cathode in microbial electrolysis cells (MECs). It is verified that the doped V was incorporated into the MoS 2 lattice with the state of V 2+ and V 4+ , and especially V 2+ bonded with edge the sulfur atom while V 4+ replaced the Mo 4+ and embedded in the crystal lattice of Mo S. Meanwhile, the doping ratio of V 2+ /V 4+ decreased with the increase in the doping content of V, revealing that the V 4+ is more beneficial for the efficiency of V-doping. Electrochemical testing demonstrated that the optimal doping amount of 10 % V significantly enhanced the electrochemical activity of MoS 2 by the activating of the inert basal plane. In the MEC system, the 10 % V-MoS 2 based electrode achieved a peak current density of 84.3 mA cm −2 with a hydrogen production rate of 289 L H₂ L −1 cycle −1 , a coulombic efficiency of 80.61 % and a cathodic hydrogen conversion efficiency of 44.84 %, which is much better than many conventional MEC catalysts, demonstrating a great potential for green hydrogen production.
研究领域:
材料科学
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电化学
·
能源工程
·
环境生物技术
·
催化化学
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产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Huiyan Jia,Jixin Zhang,Yafei Guo,Yifan Li,Yufei Wang,Xuchao Yin,Mengqian Lu,Yuqin Long,Qianying Dai,Wei-Wei Deng
The application of microbial fertilizers in tea cultivation has emerged a promising strategy to enhance tea quality and promote sustainable agricultural practices. However, the underlying mechanism remains unclear. In this study, the impacts of endophytic bacteria V4 on tea fresh leaves and dried tea were investigated. The results demonstrated that astringency in V4 sample was significantly reduced, while the umami and sweetness tastes, along with flowery and roasted aromas were significantly enhanced compared to the SW sample. Analysis of key quality-related compounds revealed a significant decrease in tea polyphenols and catechins, accompanied by a marked increase in free amino acids and soluble sugars. Evaluation of aroma characteristic impact (ACI) values of key volatile compounds revealed that β -ionone, 2-ethyl-3,5-dimethylpyrazine, 2-ethyl-3,6-dimethylpyrazine and 2,3-diethyl-5-methylpyrazine in V4 sample were significantly higher than those in SW sample. Transcriptomic analysis indicated downregulation of key catechin biosynthesis genes (such as CsLAR , CsANS and CsSCPL ) in tea leaves treated with V4, while theanine biosynthetic genes such as CsAlaDC and CsTS were upregulated. This study provides a sustainable and innovative cultivation strategy for significantly improving tea flavor and enhancing product quality.
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 10
·1-10
·
IF 2.6
Yang Lei,Gao Lijing,Wei Ruiping,Xia Rongying,Wang Ziqi,Liu Huijun,Yao Mingzhu,Ma Guanghui,Xiao Guomin
Ethylene-vinyl acetate (EVA)grafted 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (V4) polymer EVA-g-V4 was prepared by free-radical solution grafting reaction. The results of the purified grafted products by FT-IR, 1 H NMR, XRD, TG and DSC show that V4 has been successfully grafted onto the main chain of EVA. The effects of the dosage of V4 and BPO on grafting ratio were studied. When the dosage of V4 was 6.0 wt%, and the dosage of BPO was 0.8 wt%, the grafting ratio was up to 1.4%. The cross-linking behaviour was verified by SEM. Compared with pure EVA film, the peel strength, mechanical properties, volume resistivity and hydrophobicity of EVA-g-V4 film all improved with increasing grafting ratio. This work provides a new option in the field of photovolatic encapsulation materials.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 4
·1000
·
IF 3.267
Rui Liu,Ziteng Liang,Yuxuan Xiang,Weimin Zhao,Haodong Liu,Yan Chen,Ke An,Yong Yang
Na3V(PO4)2was reported recently as a novel cathode material with high theoretical energy density for Sodium-ion batteries (SIBs). However, whether V3+/V4+/V5+multielectron reactions can be realized during the charging process is still an open question. In this work, Na3V(PO4)2is synthesized by using a solid-state method. Its atomic composition and crystal structure are verified by X-ray diffraction (XRD) and neutron diffraction (ND) joint refinement. The electrochemical performance of Na3V(PO4)2is evaluated in two different voltage windows, namely 2.5–3.8 and 2.5–4.3 V.51V solid-state NMR (ssNMR) results disclose the presence of V5+in Na2−xV(PO4)2when charging Na3V(PO4)2to 4.3 V, confirming Na3V(PO4)2is a potential high energy density cathode through realization of V3+/V4+/V5+multielectron reactions.Keywords:polyanion;energy density;multielectron reaction;solid-state NMR
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
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hongying Liu,Xiaoping Liang,Tao Jiang,Yuanyang Zhang,Shiwei Liu,Xuezhuang Wang,Xiaowei Fan,Xuguo Huai,Yadong Fu,Zhenbo Geng,Dequan Zhang
The advancement of efficient ion storage film is a formidable challenge. A kind of self-doped V 4+ -V 2 O 5 ion storage nanofilm on ITO-coating glass substrate is prepared in situ by a novel hydrothermal-assisted sol-gel composite method, which is without seed layers of hydrothermal process and additives of traditional sol-gel method. There are two important factors for the growth of V 2 O 5 nanofilm, that is, heterogeneous nucleation during hydrothermal method and the electrostatic attraction between V 2 O 5 sol and ITO substrate. A small amount of oxygen vacancies are introduced into V 2 O 5 lattice during the hydrothermal process, and the oxygen vacancy concentration is controlled by annealing treatment (200∼400 °C), which significantly improve the storage capacity and Li + diffusion. The excellent cycling performance of 300 °C-V 2 O 5 nanofilm is attributed to the synergistic effect of the gradient oxygen vacancies and the good bonding force between the film and the substrate. Comparing with the ion storage capacity of V 2 O 5 film prepared by traditional sol-gel method with the same annealing treatment (17.88 mC cm −2 ) and V 2 O 5 film without annealing treatment (17.79 mC cm −2 ), 300 °C-V 2 O 5 film has the highest ion storage performance, whose initial value of ion storage is up to 112.25 mC cm −2 and cycling stability is excellent with only a 2.4% decrease after 2000 cycles. The electrochromic device (ECD) with 300 °C-V 2 O 5 nanofilm as ion storage layer and WO 3 as the electrochromic layer has been successfully assembled, which shows fascinating performance.
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 Physical Chemistry Letters
·
2026
·Vol. 17
·期 31
·9085-9096
·
IF 4.5
Liu Hanbing,Wang Chao,Wu Min,Peng Zhangquan
The
redox kinetics of the V 4+ /V 5+ couple
govern the power density and stability of all-vanadium redox flow
batteries (VRFBs). Using electrolyte additives is the most common
strategy to accelerate the kinetics, but their underlying mechanisms
remain unclear. Herein, the electrochemical behaviors of the V 4+ /V 5+ couple in sulfuric acid (H 2 SO 4 ) with phosphoric acid (H 3 PO 4 ) and perchloric
acid (HClO 4 ) as additives were systematically investigated
using powder microelectrode (PME) techniques. Based on the in-depth
electrochemical analysis using the PME, the electrochemically active
species are identified as dimers, whose electron transfer (ET) kinetics
can be accelerated by H 3 PO 4 but inhibited by
HClO 4 . Fitting the PME-acquired Tafel plots with the Marcus–Hush–Chidsey
(MHC) ET theory demonstrates that H 3 PO 4 reduces
the reorganization energy and enhances electronic coupling strength,
while HClO 4 shows the opposite effect. Furthermore, H 3 PO 4 addition yields a lower-energy intervalence
charge transfer (IVCT) absorption band and a higher electronic coupling
matrix element, indicating that it not only reduces the formation
energy of the dimers but also enhances V 4+ /V 5+ electron transfer kinetics, which is further corroborated by Raman
spectroscopy. This work provides a reliable approach to evaluate ET
kinetics and offers theoretical guidance for designing high-performance
VRFBs.
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DOI
PubMed
高影响因子
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