JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52905
·
IF 3.057
Jin Wang,Jingjing Bian,Bin Pu,Yuanlu Wang,Mengde Deng
Polyelectrolyte hydrogel used for supercapacitors have the roles of both electrolyte and separator, the morphology and the strength of gel polyelectrolyte (GPE) are the keys for ionic transport properties therein. Here, the P(NVP- co -SPE)/polyvinyl alcohol (PVA) IPN hydrogel was prepared by photopolymerization and thermal polymerization, respectively. The influences of preparation method on morphology, mechanical strength and electrochemical performances were studied. Photopolymerized IPN GPE (UV-GPE) exhibits a special regular microphase separation structure, and therefore has outstanding strength-toughness and better electrochemical performance. The tensile strength and the toughness increased intensively from the 6.2 MPa and 3.4 MJ m −3 of thermal polymerized IPN GPE (TH-GPE) to 28.5 MPa and 24.9 MJ m −3 , respectively. The maximum swelling ratio of UV-GPE is increased from 327% of TH-GPE to 630%. The ionic conductivity of UV-GPE increased from 4.29 × 10 −2 S/cm of TH-GPE to 5.82 × 10 −2 S/cm. UV-GPE has higher response current and specific capacitance. It also has the obviously better charge–discharge symmetry and cycling stability, and the capacity retention rate is still 92.3% after 1000 cycles. Thus, it brings out the fast, eco-economic photopolymerization method is an effective way to prepare high-performance polyelectrolyte hydrogel.
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高影响因子
RSC Advances
·
2020
·Vol. 10
·期 41
·24533-24541
·
IF 3.119
Huiling Chen,Yuehua Wen,Yue Wang,Songtong Zhang,Pengcheng Zhao,Hai Ming,Gaoping Cao,Jingyi Qiu
For high-voltage cycling of lithium-ion batteries, a gel polymer Li-ion conductor layer, P(VDF-HFP)/LiTFSI (PHL) with high electrochemical stability has been coated on the surfaces of as-formed LiCoO2 (LCO) cathodes by a solution-casting technique at low temperature. An LCO cathode coated with around 3 μm thickness of the PHL ultrathin membrane, retains 88.4% of its original capacity (184.3 mA h g−1) after 200 cycles in the 3.0–4.6 V range with a standard carbonate electrolyte, while the non-coated one retains only 80.4% of its original capacity (171.5 mA h g−1). The reason for the better electrochemical behaviors and high-voltage cycling is related to the distinctive characteristics of the PHL coating layer that is compact, has highly-continuous surface coverage and penetrates the bulk of LCO, forming an integrated electrode. The PHL coating layer plays the role of an ion-conductive protection barrier to inhibit side reactions between the charged LCO surface and electrolyte, reduces the dissolution of cobalt ions and maintains the structural stability of LCO. Further, the PHL coated LCO cathode is well preserved, compared to the uncoated one which is severely cracked after 200 cycles at a charging cut-off voltage of 4.6 V.
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Nanomaterials
·
2021
·Vol. 12
·期 1
·117
·
IF 5.076
Pratima Pandey,Rajashree Sahoo,Khusbu Singh,Sanghamitra Pati,Jose Mathew,Avinash Chandra Pandey,Rajni Kant,Ihn Han,Eun-Ha Choi,Gaurav Raj Dwivedi,Dharmendra K. Yadav
Bacteria employ numerous resistance mechanisms against structurally distinct drugs by the process of multidrug resistance. A study was planned to discover the antibacterial potential of a graphene oxide nanosheet (GO), a graphene oxide–zinc oxide nanocomposite (GO/ZnO), a graphene oxide-chitosan nanocomposite (GO–CS), a zinc oxide decorated graphene oxide–chitosan nanocomposite (GO–CS/ZnO), and zinc oxide nanoparticles (ZnO) alone and in a blend with antibiotics against a PS-2 isolate ofPseudomonas aeruginosa. These nanocomposites reduced the MIC of tetracycline (TET) from 16 folds to 64 folds against a multidrug-resistant clinical isolate. Efflux pumps were interfered, as evident by an ethidium bromide synergy study with nanocomposites, as well as inhibiting biofilm synthesis. These nanoparticles/nanocomposites also decreased the mutant prevention concentration (MPC) of TET. To the best of our knowledge, this is the first report on nanomaterials as a synergistic agent via inhibition of efflux and biofilm synthesis.
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高影响因子
Foods
·
2022
·Vol. 11
·期 9
·1360
·
IF 5.561
Zhiguo Jiang,Jiaolong Wang,Dong Xiang,Zhengke Zhang
In the present study, p-hydroxybenzoic acid-grafted chitosan (PA-g-CS) conjugates with different grafting degrees were synthesized by a free radical-regulated grafting approach. The conjugates were further developed into films by casting, and their characteristics and preservative effects on fresh-cut jackfruit were evaluated. Compared to the CS film, the PA-g-CS film showed comprehensive performance improvements, including enhancements of water solubility, anti-ultraviolet capacity, antioxidation, and antibacterial activity. Moreover, compared with CS film, some appreciable and favorable changes of physical properties were observed in the PA-g-CS films, which included water vapor permeability, oxygen permeability, surface morphology, moisture content, and mechanical intensity. Furthermore, compared to CS alone, the application of PA-g-CS films to fresh-cut jackfruit exerted a beneficial effect on the quality of products, as indicated by the inhibition of weight loss, softening, and membrane damage, the maintenance of soluble solids and ascorbic acids contents, as well as a reduced bacterial count and a higher sensory score. Among these PA-g-CS films, the best preservation effect was achieved with the highest degree of grafting (PA-g-CS III). The results suggested that the PA-g-CS film has the potential to be explored as a new type of packaging material for the preservation of fresh-cut fruits and vegetables.
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Chemical Engineering and Processing-Process Intensification
·
2022
·
IF 4.264
Kai Zhu,Wenjie Ye,Meng Hu,Yiping Huang,Jingjing Huang,Hanfei Liu,Hao Zhu,Zhenhao Wei,Feng Zhou
4-nitroaniline has been widely used in the production of antioxidants, dyes and pharmaceuticals. A continuous-flow strategy was exploited for the efficient synthesis of 4-nitroaniline through the noncatalytic amination of 4-chloronitrobenzene with aqueous ammonia in a highly controlled and safe manner, in which N-methyl-2-pyrrolidone was selected as the appropriate solvent. Various conditions (reaction temperature, residence time, 4-chloronitrobenzene concentration, molar ratio of ammonia to 4-chloronitrobenzene, presence of base catalyst) were investigated to improve the synthesis of 4-nitroaniline. The Box-Behnken design in response surface methodology was employed for the optimization of reaction conditions, and over 91% yield of 4-nitroaniline could be achieved. Furthermore, a kinetic model was proposed to guide the design and optimization of the synthesis of 4-nitroaniline.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 23
·8142-8154
·
IF 4
You-Hui Zhao,Hai-Yan Li,David James Young,Xiangqian Cao,Da-Liang Zhu,Zhi-Gang Ren,Hong-Xi Li
Earth-abundant copper(I) coordination complexes of an imine-phosphine and a diimine have been developed as visible-light photocatalysts. Reaction of [Cu(MeCN)4]BF4 with hetero-bidentate phosphinopyrazole (phpz) ligand R1R2C3HN2PPh3 (R1 = R2 = H (1a); R1 = H, R2 = Me (1b); R1 = H, R2 = Ph (1c); R1 = R2 = Me (1d)) and 2,9-dimethyl-1,10-phenanthroline (dmp) gave four heteroleptic bis-chelate Cu(I) complexes [Cu(dmp)(R1R2C3HN2PPh3)]BF4 (R1 = R2 = H (2a); R1 = H, R2 = Me (2b); R1 = H, R2 = Ph (2c); R1 = R2 = Me (2d)) with distorted tetrahedral geometries. Complexes 2a–2d exhibited broad absorption in the visible spectrum and could facilitate photochemical intermolecular atom-transfer radical addition reactions of CBr4, or CCl3Br, CHI3 to styrenes in yields up to 91% and with a broad substrate scope. The absorption, emission, redox potential and photocatalytic activity were dependent on the substituents on the phpz ligand. Mechanistic studies supported an atom-transfer radical addition (ATRA) mechanism.
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高影响因子
Advanced Electronic Materials
·
2021
·Vol. 7
·期 3
·2001003
·
IF 7.295
Zuoxiang Xie,Kai Feng,Yan Xiong,Xu Chen,Yudong Liang,Kamran Abid,Ling Xu
In recent years, organic–inorganic hybrid halide perovskite materials have been found to have low thermal conductivity and a large Seebeck effect, giving them great potential for thermoelectric applications. More stable single crystals make this possible. In this work, high-quality MAPbI 3 single crystals are prepared using a modified solvent engineering method, and their trap density is as low as 2.5 × 10 9 cm −3 . It is noticed that the reaction between the crystal a metal electrode causes different degrees of doping effect along the vertical direction, leading to an increase in the intrinsic P-type with Au metal, and forming N-type semiconductor characteristics with Ag metal. A high Seebeck voltage thermoelectric module is obtained by combining the perovskite single crystal with different conductive characteristics. After device optimization, the thermoelectric potential of the champion module reaches a high voltage of 337 mV at 115 °C, the maximum output power with load reaches about 30 nW, and the theoretical maximum power reaches 65 nW. It is hoped that this research can promote the development of low thermal conductivity perovskite materials in the thermoelectric field.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Limin Hu,Peng Wang,Guoshuai Liu,Qingzhu Zheng,Guangshan Zhang
In this study, Fe 3 O 4 and microwave (MW) were combined to activate persulfate (PS) for the removal of organic matter, resulting in the enhanced degradation of p -nitrophenol (PNP) in solution. During the preparation of Fe 3 O 4 , the effect of sodium acetate was examined, and the results showed that the concentration of sodium acetate had little effect on the catalytic activity of the Fe 3 O 4 /PS/MW system but did have an effect on the Fe 3 O 4 yield. In addition, with regards to the representative environmental factors, the degradation experiment showed that humic acid and the co-existing anions of chloride, sulfate, nitrate, and phosphate had little effects on p -nitrophenol removal; however, carbonate had a negative effect. In addition, the Fe 3 O 4 /PS/MW system performed well in the initial pH range of 3.0–9.0. According to the quenching experiment and electron paramagnetic resonance (EPR) detection, sulfate radicals and a minority of hydroxyl radicals play dominant roles in the degradation process. In addition, the role of Fe 3 O 4 was confirmed to take part in the degradation process by X-ray photoelectron spectroscopy (XPS) analysis. Because of the good performance observed in the water matrices of tap water and the Songhua River, these results demonstrate the potential application of the Fe 3 O 4 /PS/MW system for wastewater treatment .
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高影响因子
CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
·
2024
·Vol. 60
·期 2
·309-314
·
IF 0.6
Liu Tianyu,Ye Zhongbin,Liu Dong
Utilizing emulsion polymerization, a microcapsule breaker with a polystyrene-polyacrylamide core-shell structure was synthesized. Ammonium persulfate served as the breaker, polystyrene as the shell, and polyacrylamide as the drug-carrying agent. The results demonstrated that the synthesized microencapsulated gel-breaker exhibited a uniform spherical shape, superior water dispersion, and enhanced thermal stability. Conductivity tests indicated that the core-shell structure of the microcapsules effectively regulated the release of ammonium persulfate as a gel-breaking agent, resulting in delayed polymer gel-breaking.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Lijun Yan,Di Li,Tingting Yan,Guorong Chen,Liyi Shi,Zhongxun An,Dengsong Zhang
Due to the wide application of carbon-based materials in supercapacitors, the concern of volumetric capacitance becomes increasingly important. In this work, the N,P,S-codoped hierarchically porous carbon spheres (N,P,S-HCS) have been rationally designed and originally fabricated using the silica colloids as hard templates, polyaniline as carbon and nitrogen sources, phytic acid as phosphorus sources, and ammonium persulfate as sulfur sources. Both high volumetric and gravimetric capacitance can be achieved. The as-prepared N,P,S-HCS shows the highest specific capacitance of 274 F g–1 and 219 F cm–3 at a current density of 0.5 A g–1, which reveals a superior performance. Moreover, the cycling ability of the N,P,S-HCS can be maintained over 95% to the initial capacitance at a high current density of 10 A g–1 for 10 000 charge–discharge cycles. This is mainly contributed to the uniform doping of N, P, and S as well as the hierarchically porous structure of the N,P,S-HCS. Finally, we assemble it into the all-solid-state symmetric supercapacitors with high energy and power densities of 3.4 W h L–1 with 804 W L–1, respectively. The N,P,S-codoped hierarchically porous carbon spheres with high density show both good volumetric and gravimetric capacitance, which make it a promising material for supercapacitors in practical applications. The present investigations may develop a new direction for the design of carbon materials for a good balance of both high gravimetric and volumetric capacitance.
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高影响因子
Advanced Energy Materials
·
2017
·Vol. 8
·期 7
·1702267
·
IF 16.721
Shanshan Yao,Jiang Cui,Jiaqiang Huang,Jian-Qiu Huang,Woon Gie Chong,Lei Qin,Yiu-Wing Mai,Jang-Kyo Kim
This paper reports the rational assembly of novel hollow porous carbon nanospheres (HPCNSs) as the hosts of phosphorous (P) active materials for high-performance sodium-ion batteries (SIBs). The vaporization-condensation process is employed to synthesize P/C composites, which is elucidated by both theories and experiments to achieve optimized designs. The combined molecular dynamics simulations and density functional theory calculations indicate that the morphologies of polymeric P 4 and the P loading in the P/C composites depend mainly on the pore size and surface condition of carbon supports. Micropores of 1–2 nm in diameter and oxygenated functional groups attached on carbon surface are essential for achieving high P loading and excellent structural stability. In light of these findings, HPCNS/amorphous red phosphorus composites with enhanced structural/functional features are synthesized, which present an extremely low volume expansion of ≈67.3% during cycles, much smaller than the commercial red P's theoretical value of ≈300%. The composite anodes deliver an exceptional sodium storage capacity and remarkable long-life cyclic stability with capacity retention over 76% after 1000 cycles. This work signifies the importance of rational design of electrode materials based on accurate theoretical predictions and sheds light on future development of cost-effective P/C composite anodes for commercially viable SIBs.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 36
·13040-13046
·
IF 8.067
Yi Huang,Jin Tan,Gang Gao,Jianmei Xu,Ling Zhao,Wei Zhou,Qing Wang,Shuoguo Yuan,Jian Sun
Currently, ultraviolet photodetectors attract extensive attention from people all over the world due to their applications in solar ultraviolet radiation detection, flame detection, ozone monitoring, missile tracking, and environmental monitoring. A heterojunction is an essential aspect for fulfilling the demand for high-performance self-powered ultraviolet photodetectors. However, it is still very challenging to achieve both good electrical property and transparency for p-type semiconductors and conductors especially at low preparation temperature. This work reports the fabrication of ultrathin, ultra-high-transparency and very smooth CuI films at room temperature by the copper film iodination method, whose figure of merit (FoM) far exceeds those of most of the typical p-type oxides. The obtained p-type CuI films (p-CuI) were fabricated on an n-type Si (n-Si) substrate to construct a heterojunction photodetector. The p-CuI/n-Si photodetector has excellent optoelectronic properties in self-powered mode, including a large responsivity and detectivity (123.3 mA W−1, 5.7 × 1012 Jones), and a fast response speed (rise/decay time of 90 μs/140 μs), which are overall better than those of all types of CuI-based self-powered photodetectors. In addition, the CuI film deposited on the flexible substrate was applied in a CuI photodetector with a metal–semiconductor–metal structure, exhibiting good optoelectronic properties and bending stability, which shows promising applications in transparent, flexible, wearable electronic and optoelectronic devices.
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高影响因子
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