Polymers
·
2022
·Vol. 14
·期 23
·5323
·
IF 4.967
Xu Luo,Yu Li,Shuaijie Li,Xin Liu
As a typical brittle material, epoxy resin cannot meet its application requirements in specific fields by only considering a single toughening method. In this paper, the effects of carboxyl-terminated polybutylene adipate (CTPBA) and zinc powder on the mechanical properties, adhesion properties, thermodynamic properties and medium resistance of epoxy resin were studied. A silane coupling agent (KH-550) was used to modify zinc powder. It was found that KH-550 could significantly improve the mechanical properties and bonding properties of epoxy resin, and the modification effect of flake zinc powder (f-Zn) was significantly better than that of spherical zinc powder (s-Zn). When the addition amount of f-Zn was 5 phr, the tensile shear strength and peel strength of the composites reached a maximum value of 13.16 MPa and 0.124 kN/m, respectively, which were 15.95% and 55% higher than those without filler. The tensile strength and impact strength reached a maximum value of 43.09 MPa and 7.09 kJ/m2, respectively, which were 40.54% and 91.11% higher than those without filler. This study provides scientific support for the preparation of f-Zn-modified epoxy resin.Keywords:flake zinc powder;epoxy;modification;toughen
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·A4175
·
IF 3.12
Lubin Sun,Fangxia Zhao,Yuxin Da,Zhenzhong Zhang,Peng Wang
Submicron spherical zinc powders with high surface area, activity and low cost were prepared by DC arc plasma evaporation method. Based on the characterization of morphology, particle size and composition of ultrafine zinc powder, the effects of addition amount of PTFE and compounding of PTFE with PAAs and CMCs, electrolyte addition amount, compound mass ratio of flake and spherical zinc powder on the discharge performance of zinc electrode had been systematically studied. The results showed that ultrafine zinc powder was polycrystalline, spherical and its purity reached 99.96wt%. Under 0.2C, the discharge capacity reached 577.5mAh when addition of PTFE was 10wt.%. When 2.5wt.% PTFE was compound with 6.5wt.%(PAAs: CMCs = 2:1), the discharge capacity improved which reached 613.4 mAh. The discharge capacity was 580.3mAh when the electrolyte content was 38wt.%. When the mass ratio of special flake zinc powder to spherical zinc powder was 3:7, the discharge capacity reached 664.1 mAh, it was 13.5% higher than 584.9 mAh of pure spherical zinc powder and 22.6% higher than 541.5 mAh of pure flake zinc powder. Under 1.8C, compared with alkaline manganese battery prepared using flake zinc powders, the mass specific capacity increased by 57.12% and the volume specific capacity increased by 187.79%.
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
Energy Storage Materials
·
2024
·
IF 18.9
Qi Li,Sihan Tang,Ruiying Luo,Peng Wei,Peng Chen,Jianlong Cong,Guizhou Liu,Zhufeng Liu,Yizhong Gou,Hongzhi Wu,Shixiong Sun,Jiantao Han,Yusheng Shi,Chun Fang,Chunze Yan
Aqueous rechargeable zinc-ion batteries (ZIBs) have attracted much attention due to high safety, fast charge/discharge rate, low cost and direct utilization of zinc metal anodes. Zn powder (Zn-P) -based anodes are considered as ideal candidates for Zn-based batteries owing to their positive synergistic integration of safety and energy density through the design of the N/P ratio. However, Zn-P anodes still experience easy corrosion, hydrogen evolution and uncontrolled dendrite growth, which restrict their further application. Herein, we rationally introduce a hydrophilic polymer with multiple hydrogen bond acceptor sites to Zn-P anode to prepare a novel poly(ethylene glycol) diacrylate (PEGDA) modified Zn powder (Zn-PD) anode. By anchoring water molecules through multiple hydrogen bonds, the solvation structure of Zn 2+ is modulated, and the electrochemical activity of free water at the interface is reduced, which inhibits Zn corrosion and hydrogen evolution.
研究领域:
电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 10
·1406
·
IF 3.236
Yuxing Bai,Xuliang Jin,Junqing Xie,Xiao Lv,Tingting Guo,Li Zhang,Jesse Zhu,Yuanyuan Shao,Haiping Zhang,Hui Zhang,Bin Yuan,Aiming Yin,Jinfeng Nie,Fan Cao,Zhengjun Xu
In the study, a conductive polypyrrole (PPy) is deposited on the lamellar sericite powder (SCP) surfaces by an in situ oxidization growth method and the prepared PPy/SCP conductive additive is successfully applied on the zinc-rich primer (ZRP) coating. The equal mass substitution and the equal volume substitution methods of the conductive additives to zinc dusts are discussed, as well as the optimal replacing ratio to achieve the best corrosion protection effect of the ZRP coatings. The results indicate that the equal volume substitution method is in favor of corrosion resistance of coating film. The salt spray test and the electrochemical impedance spectroscopy (EIS) and polarization curves show that the prepared ZRP coating with a 66% zinc content and replacing ratio of 1:3 possesses the best corrosion-resistant performance and an optimal adhesion strength. The replacement of PPy/SCP particles to zinc dusts using the equal volume substitution method is feasible to achieve the improvement in anticorrosion ability through a synergic function of the cathodic protection effect and barrier effect.
研究领域:
材料科学
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腐蚀与防护
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电化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 19
·2200860
·
IF 32.086
Min Zhang,Peifeng Yu,Kairong Xiong,Yongyin Wang,Yingliang Liu,Yeru Liang
Zn powder (Zn-P)-based anodes are considered ideal candidates for Zn-based batteries because they enable a positive synergistic integration of safety and energy density. However, Zn-P-based anodes still experience easy corrosion, uncontrolled dendrite growth, and poor mechanical strength, which restrict their further application. Herein, a mixed ionic-electronic conducting scaffold is introduced into Zn-P to successfully fabricate anti-corrosive, flexible, and dendrite-free Zn anodes using a scalable tape-casting strategy. The as-established scaffold is characterized by robust flexibility, facile scale-up synthesis methodology, and exceptional anti-corrosive characteristics, and it can effectively homogenize the Zn 2+ flux during Zn plating/stripping, thus allowing stable Zn cycling. Benefiting from these comprehensive attributes, the as-prepared Zn-P-based anode provides superior electrochemical performance, including long-life cycling stability and high rate capability in practical coin and flexible pouch cells; thus, it holds great potential for developing advanced Zn-ion batteries. The findings of this study provide insights for a promising scalable pathway to fabricate highly efficient and reliable Zn-based anodes and will aid in the realization of advanced flexible energy-storage devices.
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
PubMed
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2020
·Vol. 362
·期 12
·2337-2341
·
IF 5.851
Wei Hang,Yaping Yi,Chanjuan Xi
Cobalt-catalyzed reductive carboxylation of aryl bromides with carbon dioxide has been developed. The reaction proceeded under one atm pressure of CO 2 at 40 °C in the presence of cobalt iodide/2,2′-bipyridine catalysts and zinc dust as a reducing reagent. Various aryl bromides could be converted to the corresponding carboxylic acids in good to high yields. Preliminary mechanistic experiments ruled out intervention of intermediate organozinc species for carboxylation with CO 2 , thus suggesting a direct CO 2 insertion into the corresponding ArCoBr species.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Jianqiang Ye,Shixing Wang,Rong Zhu,Likang Fu,Jian Liu,Genwei Zhang,Guo Lin
The purification of zinc sulfate electrolyte is an essential process in zinc hydrometallurgy. The agglomeration of zinc powder and difficulty in removing nickel ions are considered the main challenges in the purification of zinc sulfate electrolyte. Herein, we developed an ultrasonic method to substitute nickel ions with zinc with a high removal efficiency (95.27 %) under optimized conditions. The removal percentage under the ultrasonic condition was 25.26 % higher than that under the conventional condition. Physical characterization indicates that the ultrasonic field reduces zinc powder agglomeration, breaks up inclusions and the passivation layer, and enhances the mass transfer during the nickel removal reaction. Electrochemical studies reveal that ultrasonic vibrations and cleaning reduce the overpotential of nickel removal through zinc powder replacement. In-situ modification of the zinc anode enhances zinc powder activity and increases the potential difference in zinc‑nickel primary batteries, thereby boosting the reaction's thermodynamic driving force. Finally, the COMSOL numerical simulation theoretically verified that the heat and mass transfer processes of the solution were accelerated under the ultrasonic condition. The findings of this study can guide the purification process in zinc hydrometallurgy and provide novel insight into ultrasonically boosted chemical reactions.
研究领域:
冶金学
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Dongju Wang,Hou Chen,Fujun Cao,Jinming Sun
Zinc powder was used as both reducing agent and supplemental activator for atom transfer radical polymerization via activators regenerated by electron transfer (ARGET ATRP) to prepare polyacrylonitrile (PAN). Zinc powder was found to be an excellent additional agent with better controlled behavior, higher monomer conversion, and faster polymerization rate in comparison with ascorbic acid (VC). The effects of catalyst, ligand, and initiator on polymerization rate and molecular weight of PAN were investigated in detail. The resulting PAN was modified and employed as an adsorbent for removal of metal ions. Compared with Cu(II) and Pb(II), the modified PAN showed an excellent adsorption performance toward Hg(II).
研究领域:
高分子化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2020
·Vol. 38
·期 10
·1057-1064
·
IF 3.826
Chongyang Du,Yaofeng Chen
Summary of main observation and conclusion Transformation of CO 2 into valuable organic compounds catalysed by cheap and biocompatible metal catalysts is one of important topics of current organic synthesis and catalysis. Herein, we report the zinc powder catalysed formylation and urealation of amines with CO 2 and (EtO) 3 SiH under solvent free condition. Using 2 mol% zinc powder as the catalyst, a series of secondary amines, both the aromatic ones and the aliphatic ones, can be formylated into formamides. When primary aromatic amines were used as the substrates, the reactions produce urea derivatives. The electronic and steric effects from the substrates on the formylation and urealation reactions were observed and discussed. The recovery and reusability of zinc powder were investigated, showing the zinc powder can be reused in the formylation reaction without loss of catalytic activity. The analysis on the reactants/products mixture after filtering out the zinc powder showed the zinc concentration in the mixture is low to 1 ppm. The pathways for the formylation and urealation of amines with this catalytic system were also investigated, and related to the different substrates.
研究领域:
有机化学
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催化化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Hang Liu,Penghui Cao,Ying Chen,Can Chen,Sicheng Fan,Chuanchang Li,Huali Zhu,MengDi Wu,Juan Yang
Zn powder anodes have attracted much attention in aqueous Zn ion battery applications due to advantages such as low cost and processability. However, the high-activity Zn powder anode faces problems such as side reactions, hydrogen evolution, and dendrites, which limit the cycling stability of the cell. In this work, the high activity of Zn powder is weakened by introducing low-cost erythritol as a functional additive in the ZnSO 4 electrolyte to improve the cycle life of the cell. Both theoretical calculations and empirical evidence demonstrate that the incorporation of erythritol alters the coordination sphere of Zn 2+ and modifies the local molecular architecture of the electrolyte. This modification serves to diminish the reactivity of water molecules, thereby efficaciously suppressing dendrite formation and deleterious ancillary reactions on the zinc powder anode surfaces. Concurrently, erythritol functions as an interfacial cationic captor, enhancing reaction dynamics and facilitating the development of a favorable protective layer throughout the zinc plating/stripping process. Consequently, the symmetric cell paired with an erythritol-containing electrolyte manifests stable cycling performance for an extended duration of 850 h at a current density of 0.288 mA cm −2 and areal capacity of 0.144 mAh cm −2 . Notably, it maintains a cycling life of 400 h even under intensified conditions (2.88 mA cm −2 /1.44 mAh cm −2 ). Furthermore, the constructed Na 2 V 6 O 16 ·3H 2 O full cell illustrated remarkable capacity retention of 155.8 mAh g −1 following 800 cycles at a high rate of 5 A g −1 .
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
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 13
·7990-7996
·
IF 9.3
Jiahao Tang,Jiale Cao,Yunxuan Jiang,Siying Gou,Ruiqi Yao,Yingqi Li,Bo-Tian Liu
Zinc powder (Zn-P) anodes are more ideal for Zn-ion batteries in practical industrial applications than the commonly used zinc foil anodes due to their low cost, good tunability and easy-processability. However, the Zn-P anodes with high contact surface area suffer from more serious side reactions than zinc foil. Herein, we synthesize an amorphous carbon coated zinc powder-based anode (C@Zn-P) for more homogeneous Zn deposition through a combined simple spraying and annealing method. As a result, the C@Zn-P anode exhibits long-term cycling stability over 600 h with low voltage hysteresis of 20 mV at 1 mA cm−2 and 0.5 mA h cm−2, which outperforms most previous results from commercial Zn foil and powder-based anodes. It is worth mentioning that a C@Zn-P||Ti asymmetric cell shows superior reversible properties and higher coulombic efficiency (CE) compared with the Zn||Ti asymmetric cell in plating/stripping of Zn. Moreover, the C@Zn-P anode matched with a multivalent vanadium-based oxide (MVO) cathode shows superior long-term cycling with a capacity retention (CR) of 81.4% after 1000 cycles. This result demonstrates that the Zn powder anode is a promising avenue for further development of rechargeable Zn-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yishan Jin,Kai Jin,Wenjing Ji,Zhanfeng Zhang,Linsong Gan,Peng Han,Xinhai Yuan,Lijun Fu,Yuping Wu
Zinc powder is the key anode material for the commercialization of aqueous Zn ion batteries (AZIBs), taking advantage of its cost-effectiveness and ease of processing. However, they face challenges such as severe dendrite growth, side reactions, and corrosion due to the rough surface with high specific area. This paper proposes a low-cost, simple, and scalable method to modify Zn powder-based anodes by incorporating nano-Copper (NC) powder as a functional conductive agent, and the modified Zn powder electrode is denoted as ZP-NC. This NC powder modification enhances the electronic conductivity, lowers the charge transfer activation energy, and provides an even electric field for uniform Zn deposition. It further alleviates the electrochemical corrosion during storage and cycling. Thus, the rate capability and cycle stability of the Zn powder electrode are significantly enhanced while keeping a high Zn utilization. With an optimized N/P ratio of 4.3, the ZP-NC||NaV 3 O 8 ·1.5H 2 O (NVO) full battery achieves a high energy density of 81 Wh kg −1 . This work provides a facile method to enhance the performance of Zn powder-based anodes for practical application, and it also plays a pivotal role in advancing the development of AZIBs with high energy density.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）