ACS Applied Energy Materials
·
2022
·
IF 6.959
Yuxing Gao,Chunli Wang,Dongming Yin,Zhaomin Wang,Fan Wu,Yong Cheng,Limin Wang
While vanadium oxides have garnered interest due to their high capacity and abundant valence states in aqueous zinc-ion batteries (AZIBs), there are many challenges to achieving long cycling stability and excellent rate capability resulting from poor electronic conductivity and sluggish reaction dynamics. Herein, we design a cathode material VNxOy/C derived from a self-assembled V-polydopamine complex via a one-step organic–inorganic hybrid reaction. Benefiting from a well-organized structure and nanosized particle embedding, the as-prepared VNxOy phase could favor zinc-ion insertion/extraction due to the strong affinity of N element with Zn2+. Systematic investigations show that the controllable strategy yields positive effects on the electrochemical performances including enhanced rate capability and cycling stability, which are superior to those of the V2O3/C cathode. As a result, we have achieved fast charging/discharging capability at 10 A g–1 and stability exceeding 700 cycles at 3 A g–1 with nearly 100% Coulombic efficiency. Interestingly, the pouch-cell-like devices with ∼24 mAh could light an LED effectively. This work may pave the way to obtaining highly active V-containing compounds with structure design to improve electrochemical performances of AZIBs.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 20
·2830-2842
·
IF 4.927
Mo Zhu,Nairong Hao,Jinxian Yang,Lianwei Li
V-type (B∼∼A∼∼B) and Y-type (A∼∼∼∼B2) macromonomer approaches are two of the most widely adopted synthetic methodologies for the preparation of long-subchain hyperbranched polymers (LHPs) with a controlled subchain length. However, little attention has been paid to the difference of the structural regularity of hyperbranched polymers prepared via the two approaches in previous related studies. This work aims to elucidate how these two synthetic approaches quantitatively influence the polymerization, branching pattern and solution properties of the prepared hyperbranched polymers. First, two sets of model hyperbranched polystyrenes (HPSV and HPSY) were prepared from V-type and Y-type macromonomers by a combination of atom transfer radical polymerization (ATRP) and azide–alkyne cycloaddition coupling reaction, respectively. The intrachain cyclization study indicated that the macromonomer self-cyclization during the interchain coupling process was strongly affected by the chain length and the structure of the used macromonomer as well as the reaction concentration. The V-type macromonomer was found to be less inclined to undergo interchain coupling due to the stronger steric hindrance effect. Furthermore, via triple-detection size exclusion chromatography (TD-SEC) characterization, the intrinsic viscosity ([η]) and the radius of gyration (Rg) were found to be scaled to the molar mass of the macromonomer (Mm) and the molar mass of the entire chain (Mt) as [η] = KηMtνMmμ (μ ≃ 0.25 and ν ≃ 0.40) and Rg = HRMtαMmβ (α ≃ 0.47 and β ≃ 0.083) for both HPSV and HPSY samples. These scaling relationships evidenced that both HPSV and HPSY hyperbranched structures hold a similar statistically fractal feature. More importantly, the determined values of ratios Kη,Y/Kη,V (∼1.5) and HR,Y/HR,V (∼1.2) demonstrated, for the first time, that the average equivalent length of the branching subchain (Ls) for HPSY is much longer than the initial macromonomer chain length (Lm), i.e. Ls = 2.5Lm while Ls is exactly equal to 1/2Lm for HPSV. This finding clearly clarified the difference between Ls and Lm, and thus the terms of Ls and Lm should not be misused in the future structure–property study. Finally, the value of the Rg/Rη ratio is determined to be ∼1.05 and ∼1.15 for HPSV and HPSY samples (Rη: viscometric radius), respectively, which are much smaller than the typical values for linear chains in good solvents (1.20–1.40), revealing the less draining nature of these hyperbranched structures.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 24
·2300711
·
IF 7.9
Chunkai Wang,Ding Ma,Mengge Li,Yue Liu,Xiaofei Sun,Yuting Sun,Yan Zhu,Zhanhui Ding,Yongfeng Li,Bin Yao
One of the key issues impeding the enhancement of power conversion efficiency (PCE) of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells is the severe carrier recombination at CZTSSe/MoSe 2 back interface, primarily arising from the reverse electric field formed between CZTSSe and n-type MoSe 2 produced after selenization. To inhibit recombination at back interface, herein, the MoSe 2 layer is converted from n-type to p-type by V doping in site through reaction of V-alloyed Mo (Mo:V) back electrode with Se during selenization, and CZTSSe solar cells with p + -type V-doped MoSe 2 (MoSe 2 :V) interface layer are fabricated. It is found that the PCE of the device rises from 8.34% to 9.63% as back contact changes from soda lime glass (SLG)/Mo/n-MoSe 2 to SLG/Mo:V/p + -MoSe 2 :V. The quantitative analysis demonstrates that the increased PCE predominantly originated from the decreased reverse saturated current density ( J 0 ), followed by the decreased series resistance ( R S ), and lastly by the increased photogenerated current density ( J L ). The influence mechanism of the SLG/Mo:V/MoSe 2 :V back contact on device performance is suggested by studying the properties of Mo:V and MoSe 2 :V films and CZTSSe/MoSe 2 :V heterojunction. This work emphasizes the vital significance of the back surface passivation field induced by p + -MoSe 2 :V/p-CZTSSe heterojunction, which is enlightening for optimizing the back contact in kesterite photovoltaics.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Haofeng Chen,Chao Liang,Suhang Xun,Zhendong Yu,Cancan Wu,Minqiang He,Huaming Li,Wenshuai Zhu
Bimetallic oxide is a potential catalyst for oxidative desulfurization of fuel. Thus, an appropriate method is needed to improve its catalytic performance. Manufacturing defect is an effective means. In this contribution, an oxygen vacancies (OVs) regulation strategy for enhancing the catalytic activity of bimetallic oxide is proposed. Density functional theory (DFT) calculations show that the crystal phase has a huge influence on the generation energy of oxygen vacancies, so a series of V-Nb mixed oxide with different crystal phases are synthesized. Detailed characterizations show that the as-prepared tetragonal V-Nb mixed oxide ( T -VNbO x ) has lower OVs formation energy and larger OVs concentration (compared to orthorhombic V-Nb mixed oxides, O -VNbO x ). Owing to the activation of OVs, the catalytic activity of T -VNbO x was significantly enhanced to form ultra-deep oxidative desulfurization. In addition, T -VNbO x can be cycled eight times without significantly degrading the desulfurization performance.
研究领域:
催化
·
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2013
·
IF 3.498
Shengping Wen,Xiashi Zhu
A simple, sensitive and efficient method of ultrasound-assisted emulsification of solidified floating organic drop microextraction (USE-SFODME) coupled to electrothermal atomic absorption spectrometry for the speciation of antimony at different oxidation state Sb(III)/Sb(V) in environmental samples was established. In this method, the hydrophobic complex of Sb(III) with sodium diethyldithiocarbamate (DDTC) is extracted by 1-undecanol at pH 9.0, while Sb(V) remains in aqueous phase. Sb(V) content can be calculated by subtracting Sb(III) from the total antimony after reducing Sb(V) to Sb(III) by l -cysteine. Various factors affecting USE-SFODME including pH, extraction solvent and its volume, concentration of DDTC, sonication time, and extraction temperature were investigated. Under the optimized conditions, the calibration curve was linear in the range from 0.05 to 10.0 ng mL −1 , with the limit of detection (3 σ ) 9.89 ng L −1 for Sb(III). The relative standard deviation for Sb(III) was 4.5% ( n =9, c =1.0 ng mL −1 ). This method was validated against the certified reference materials (GSB 07-1376-2001, GBW07441), and applied to the speciation of antimony in environmental samples (soil and water samples) with satisfactory results.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lu Zhou,Ang Li,Fang Ma,Heping Zhao,Fengxia Deng,Shanshan Pi,Aiqi Tang,Jixian Yang
In this work, we prepared microbial extracellular polymeric substances-coated nano zero valent iron (EPS@nZVI) for Sb(V) removal. Batch adsorption experiments showed that the synthesized EPS@nZVI had superior maximum adsorption capacity (202 mg/g at pH = 5) for Sb(V), much higher than that of bare nZVI especially under nonacidic conditions. The adsorption results fit the pseudo-second-order kinetic model and the Redlich-Peterson model well, implying that the adsorption was more like a chemical adsorption process. The spectral analysis showed that EPS could protect inner Fe 0 from air, preventing nZVI from generating a passivation layer on the surface, and decreasing the concentration of hydroxyl radicals in aqueous environment, which increased the reactivity of nZVI and strengthened the reducibility and adsorbability of nZVI. The coated EPS can improve the reactivity of nZVI instead of inhibiting its electron transfer. Moreover, the electrostatic repulsion between EPS@nZVI and Sb(OH) 6 − was decreased compared to that of bare nZVI after the introduction of EPS. The functional groups of EPS could play a significant role in the reduction adsorption, especially under alkaline conditions where nZVI was passivated. This work proved that EPS@nZVI has great prospects in simultaneously combining the reduction activity of nZVI in water and its stability in air.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 12
·4853-4861
·
IF 4.569
Jie Bai,Tianning Zhou,Yihao Gao,Meilin Zhang,Xiaofei Jing,Yaqiong Gong
Due to the slow reaction kinetics of the oxygen evolution reaction (OER), the electrolysis rate of water is greatly limited. Therefore, it is of great significance to study stable and efficient non-noble metal based electrocatalysts. In this paper, three-dimensional (3D) spherical V-NiFe LDH@Ni3S2 was developed by exquisitely decorating ultra-thin V-doped NiFe layered dihydroxide (NiFe-LDH) on Ni3S2 nanosheets supported by nickel foam (NF). It is worth mentioning that V-NiFe LDH@Ni3S2 exhibits an excellent electrocatalytic performance and only 178 mV overpotential is required in 1 M KOH to achieve a current density of 10 mA cm−2. Long-term chronoamperometry manifests its superior electrochemical stability. The combination of NiFe LDH and conductive substrate coupling can drastically afford abundant active sites and accelerate charge transfer, and V doping can markedly regulate the electronic structure. Therefore, the activity and durability of the electrocatalysts are greatly improved. This study may provide a new strategy for the preparation of efficient OER electrocatalysts.
研究领域:
电化学
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材料科学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Healthcare Materials
·
2024
·
IF 10
Jianshuai Bao,Zengyin Li,Deliang Wang,Jiefei Wang,Guan Huang,Jianlei Qian,Xiaoyan Yang,Peng-Cheng Duan,Sheng Zhang,Feng Bai,Yong Zhong
Near-infrared second region (NIR-II) fluorescence imaging provides enhanced tissue penetration, achieving efficient NIR-II fluorescence and photoacoustic imaging (PA)-guided photothermal therapy (PTT) all in one material remains a challenging yet promising approach in cancer treatment. Herein, open-shell V═O metalloradical complex (VONc) is self-assembled into VONc nanospheres (VONc NPs). VONc NPs exhibit light absorption from 300 to 1400 nm, fluorescence spectra ranging from 900 to 1400 nm, and a distinct fluorescence signal even at 1550 nm. Moreover, VONc NPs exhibit outstanding photostability and a higher photothermal conversion efficiency of 46.6% than that of closed-shell zinc naphthalocyanine nanorods (ZnNc NRs). V═O centered metalloradical serves as transient electron-withdrawing groups to facilitate charge transfer (CT), introducing additional nonradiative energy dissipation pathways and enhancing efficient heat generation. In vitro experiments of VONc NPs indicate that a highly effective photothermal action causes harm to both mitochondria and lysosomes, resulting in the death of tumor cells, closed-shell ZnNc NPs exhibit almost no cell killing as contrast. In vivo anti-tumor therapy results of VONc NPs demonstrate excellent NIR-II fluorescence imaging-guided PTT against tumors with a favorable biosafety profile. “Centered metalloradical boosting CT” toward open-shell metal complexes provides significant insight for developing single-material integrated nanosystems for diagnostic and therapeutic applications.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yan Wu,Ling-Hui Kong,Wen-Ting Ge,Wen-Jie Zhang,Zhen-Yue Dong,Xiao-Jing Guo,Xi Yan,Yan Chen,Wan-Zhong Lang
A porous V/SiO 2 sphere composite (VO X @SiO 2 ) was synthesized using one-step sol-gel method. Benefiting from the redox properties of vanadium and the hydrophilic property, VO X @SiO 2 showed good catalytic performances for the selective oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) in aqueous phase through peroxymonosulfate (PMS) activation, and performed far better in water than in various organic solvents. The redox cycle of V V /V IV was supposed to be responsible for PMS decomposition in the VO X @SiO 2 /PMS system. The S O 4 ∙ - , 1 O 2 and mediated electron transfer were revealed to play a major role in the selective oxidation of BzOH to BzH. The intrinsic kinetics was analyzed to calculate the chemical reaction rate (r a ) and reaction order (n = 0.33) with respect to BzOH. This study provided some insights into the development of vanadium-based heterogeneous catalyst for the selective oxidation of BzOH to BzH through PMS activation.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 38
·6668-6674
·
IF 3.545
Xianpei Ren,Qingbo Wei,Fei Wu,Yonghua Wang,Qiang Li
Transition metal sulfides, such as molybdenum sulfide and vanadium sulfide, have recently attracted substantial attention due to their potential application to the catalysis of the hydrogen evolution reaction (HER). Alloying is one of the powerful methods to exceed the intrinsic properties of pure metals. In this study, we report a simple one-step sintering method to synthesize MoS2, V1.5S2 and V–Mo–S alloys on carbon nanotubes (CNT/VMoS). Due to its compositional, morphological and electrical superiorities, the CNT/VMoS-2 catalyst recorded the optimal HER activity with a low overpotential of −146 mV at 10 mA cm−2, a low Tafel slope of 61 mV dec−1 and a very small Rct value of 8.8 Ω, which were superior to CNT/MoS2, CNT/V1.5S2 and other CNT/VMoS catalysts in acidic media, holding a great promise for practical water-splitting applications. We believe that the present work could broaden our horizon about the preparation of other transition metal sulfide alloys and provide a platform to understand the fundamental catalytic mechanism for improving HER performance.
研究领域:
材料科学
·
催化
·
能源材料
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2014
·
IF 3.511
Kai Hu,Suxiang Feng,Mingxia Wu,Shuang Wang,Wenjie Zhao,Qiong Jiang,Ajuan Yu,Shusheng Zhang
A new stationary phase for high-performance liquid chromatography was prepared by covalently bonding a V-shape cage heteroatom-bridged calixarene onto silica gel using 3-aminopropyltriethoxysilane as coupling reagent. The structure of the new material was characterized by infrared spectroscopy , elemental analysis and thermogravimetric analysis . Linear solvation energy relationship method was successfully employed to evaluate the new phase with a set of 34 solutes. The retention characteristic of the new phase shows significant similarities with ODS, as well as distinctive features. Multiple mechanisms including hydrophobic, hydrogen bonding , π–π and n–π interaction are involved. The chromatographic behavior of the phase was illustrated by using alkylbenzenes , aromatics positional isomers and flavonoids as probes. Moreover, inorganic anions were individually separated in anion-exchange mode by using the same column. Thus, multi-interaction mechanisms and mixed-mode separation of the new phase can very likely guarantee its excellent chromatographic performance for the analysis of complex samples. The column has been successfully employed for the analysis of clenbuterol in animal urine, and it is demonstrated to be suitable and a competitive alternative analytical method for the determination of clenbuterol.
研究领域:
分析化学
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2022
·Vol. 20
·期 1
·1-11
·
IF 9.429
Hsieh Yuan-Chin,Liao Jun-min,Chuang Kuo-Hsiang,Ho Kai-Wen,Hong Shih-Ting,Liu Hui-Ju,Huang Bo-Cheng,Chen I-Ju,Liu Yen-Ling,Wang Jaw-Yuan,Tsai Hsiang-Lin,Su Yu-Cheng,Wang Yen-Tseng,Cheng Tian-Lu
Background Humanization of mouse monoclonal antibodies (mAbs) is crucial for reducing their immunogenicity in humans. However, humanized mAbs often lose their binding affinities. Therefore, an in silico humanization method that can prevent the loss of the binding affinity of mAbs is needed.Methods We developed an in silico V(D)J recombination platform in which we used V(D)J human germline gene sequences to design five humanized candidates of anti-tumor necrosis factor (TNF)-α mAbs (C1–C5) by using different human germline templates. The candidates were subjected to molecular dynamics simulation. In addition, the structural similarities of their complementarity-determining regions (CDRs) to those of original mouse mAbs were estimated to derive the weighted interatomic root mean squared deviation (wRMSDi) value. Subsequently, the correlation of the derived wRMSDi value with the half maximal effective concentration (EC50) and the binding affinity (KD) of the humanized anti-TNF-α candidates was examined. To confirm whether our in silico estimation method can be used for other humanized mAbs, we tested our method using the anti-epidermal growth factor receptor (EGFR) a4.6.1, anti-glypican-3 (GPC3) YP9.1 and anti-α4β1 integrin HP1/2L mAbs.Results The R2 value for the correlation between the wRMSDi and log(EC50) of the recombinant Remicade and those of the humanized anti-TNF-α candidates was 0.901, and the R2 value for the correlation between wRMSDi and log(KD) was 0.9921. The results indicated that our in silico V(D)J recombination platform could predict the binding affinity of humanized candidates and successfully identify the high-affinity humanized anti-TNF-α antibody (Ab) C1 with a binding affinity similar to that of the parental chimeric mAb (5.13 × 10−10). For the anti-EGFR a4.6.1, anti-GPC3 YP9.1, and anti-α4β1 integrin HP1/2L mAbs, the wRMSDi and log(EC50) exhibited strong correlations (R2 = 0.9908, 0.9999, and 0.8907, respectively).Conclusion sOur in silico V(D)J recombination platform can facilitate the development of humanized mAbs with low immunogenicity and high binding affinities. This platform can directly transform numerous mAbs with therapeutic potential to humanized or even human therapeutic Abs for clinical use.Graphical Abstract
研究领域:
免疫学
·
生物信息学
·
分子生物学
·
药物开发
✓ 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）