Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 37
·19444-19453
·
IF 11.301
Ke Wen Mu,Kai Xi Liu,Zhi Yong Wang,Shahid Zanman,Yan Hong Yin,Xian Bin Liu,Ye Sheng Li,Bao Yu Xia,Zi Ping Wu
Flexible lithium-ion batteries have attracted extensive attention in electronics. However, their practical applications are primarily limited by low open-circuit voltage and energy density. Herein, we report a novel surface/interface modification strategy to obtain an electrolyte-phobic carbon nanotube film as the flexible current collector for foldable lithium-ion batteries. The as-assembled battery exhibits a high open-circuit voltage of 4.04 V and energy density of ∼293 W h kg−1 with excellent flexibility and stable cycle performance. The outstanding performance is ascribed to the electrolyte-phobic surface/interfacial layer of the carbon nanotube film, which restrains the intercalation of lithium ions into the carbon-based current collector. This work not only demonstrates a practical solution to appreciably revamp the voltage and energy density of flexible lithium-ion batteries, but more importantly, offers valuable insights for modifying the surface/interface chemistry of carbon-based current collectors for high-performance energy storage devices.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Zhiwen Lei,Jianwen Feng,Yu Yang,Jinlai Shen,Weide Zhang,Chaoyang Wang
Zeolitic imidazolate frameworks (ZIFs) possess tremendous potential in various adsorption and catalysis areas for their particular structures. However, the dispersibility and acid stability of ZIFs are important issues hindering their applications. To address these challenges, a transparent polydimethysiloxane (PDMS) coating was constructed to heterogeneously anchor the Cu doped ZIF-67 (Cu/ZIF-67) nanoparticles on melamine sponge surface, achieving a PDMS-coated ZIF three-dimensional composite sponge. Thus PDMS coating could also effectively protect ZIFs from acid damage to prolong the service life of photocatalyticity. It was demonstrated that the composite sponges were able to repeatedly (over 40 cycles) degrade Sudan I dyes with remarkable photocatalytic efficiency (>97%). More importantly, the ion impenetrability of PDMS coating made the ZIFs based composite a longer term catalytic life than unprotected Cu/ZIF-67 under acid condition. Incidentally, due to the introduction of rough ZIFs and hydrophobic PDMS coating, the obtained sponge also exhibits super-hydrophobicity (158.5°), great compressibility and excellent oil/acid water separation performance. We expect that such a polymer coating strategy could act as a novel inspiration for extending the applications and life span of ZIF-based composites.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Huan Luo,Heng Li,Qingmei Ge,Hang Cong,Zhu Tao,Mao Liu
A novel chiral sensor was developed to produce the distinguishing response to the enantiomers of tyrosine (Tyr), with high sensitivity and selectivity. The electrochemical sensor was modified by the inorganic-organic nanohybrid material with the functionalization of reduced graphene oxide (rGO) to be the amplifier and a chiral hetero-multifarene[3,2,1] (CHMF[3,2,1]) as the chiral receptor. The as-prepared rGO-CHMF was characterized by transmission electron microscopy (TEM), atomic force microscope (AFM), infrared spectroscopy (IR), thermogravimetric analysis (TGA), Raman spectroscopy and electrochemical methods. It was observed that the composites exhibited different binding ability for Tyr enantiomers. The proposed sensor presented significant difference with peak potential separation value (ΔE p = 70 mV) and the ratio of peak current ( I L-Tyr / I D-Tyr = 1.58) for Tyr enantiomers by differential pulse voltammetry. In addition, the peak currents increased linearly with the concentration of Tyr enantiomers in the concentration range 0.1–10 μM with detection limits of 78 nM and 83 nM for l -Tyr and d -Tyr (S/N = 3), respectively. It also exhibited the ability to determine the percentage of one Tyr enantiomer in the racemic mixture. Moreover, the selectivity, reproducibility, and stability of the chiral sensor were investigated to give satisfactory results. The above discoveries offered an alternative technology for chiral recognition with electrochemical response to actualize a real-time and quantitative determination.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 24
·16557-16566
·
IF 2.993
Wu Jiahao,Huang Shaolong,Jin Zhengyuan,Chen Jiaqi,Hu Liang,Long Yaojia,Lu Jianguo,Ruan Shuangchen,Zeng Yu-Jia
Black phosphorus (BP), a phosphorus analog of graphene, is a two-dimensional material with the thickness-dependent bandgap and a high carrier mobility, which emerges as a promising material in nanoelectronics and optoelectronics. In this study, BP loaded with surface hydroxyl has been prepared by liquid ultrasonic exfoliation and used as the co-catalyst, which results in 341% photocatalytic hydrogen evolution enhancement to the anatase TiO 2 under the simulated sunlight irradiation and a quantum efficiency as high as 18.23% at 365 nm. The improved photocatalytic activity has been ascribed to the Z-scheme mechanism. These results indicate that 2D surface hydroxyl-loaded BP can be used as a broadband photocatalyst by forming type II heterostructures with other wide-bandgap semiconductors.
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Chem Catalysis
·
2024
·
IF 11.5
Jun Zhang,Songying Qu,Lin Lin,Ruiquan Yu,Wutong Chen,Xiaoyan Li
Advanced oxidation processes represent effective approaches toward water purification, but they are often energy and chemical intensive. Here, we show a solar cell with a highly reactive microinterface for high-flux wastewater treatment with requirements for only water, oxygen, and sunlight. Experiments demonstrate that hydrogen peroxide is produced in a porous cathode via two-electron oxygen reduction and then flows to a porous photoanode surface, where it is instantly activated to hydroxyl radicals (⋅OH) by light and integrated with indigenous ⋅OH generated via one-electron water oxidation. Accordingly, a microscale region (∼150 μm for thickness) with high-density ⋅OH (∼2.5 mM) is successfully constructed but remains spatially constrained on the photoanode surface. Refractory pollutants (such as norfloxacin) pass through this microinterface successively and are degraded rapidly (>99% in ∼0.6-s retention time) due to violent collision between ⋅OH and targets, even after 360 h of long-term operation. Our findings highlight an innovative catalytic platform design scheme for efficient water purification.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 32
·21106-21113
·
IF 10.7
Minghui Cui,Yansong Zhou,Rongjing Guo,Wenqi Zhao,Yanjing Liu,Qiongrong Ou,Shuyu Zhang
Electrolytic water splitting using renewable energy sources, such as solar power, provides a green and sustainable approach for hydrogen production. Anion exchange membrane (AEM) electrolyzers present substantial commercial prospects; however, the rate of hydrogen evolution reaction (HER) in alkaline electrolytes is limited by the water dissociation step. In this work, we fabricated an N-doped Ni substrate for loading ultrafine Pt nanoparticles, realizing spatial decoupling of the reaction process to break the limitation of water dissociation, where the N-doped Ni substrate and Pt nanoparticles facilitate the supply of ample H* and H2 release, respectively. The prepared Pt–N–Ni/NC with extremely low Pt loading (1.0 wt%) requires only 15 and 149 mV overpotentials to reach current densities of 10 and 1000 mA cm−2, respectively. When assembled into an AEM electrolyzer, the system requires a cell voltage of only 1.75 V to achieve a current density of 1000 mA cm−2. Notably, the solar-driven AEM electrolyzer demonstrates a current density of 1390 mA cm−2 with a solar-to-hydrogen efficiency (STH) of 8.27%. This study proposes a strategy to achieve efficient utilization and performance improvement of precious metals, promoting the development of efficient green hydrogen production.
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JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2015
·Vol. 82
·期 3
·453-460
·
IF 1.488
Li Shujing,Yue Junzhi,Zhou Wei,Li Li
The inclusion complexes between puerarin and three cyclodextrins (CDs), namely β-cyclodextrin (β-CD), (2-hydroxy)propyl-β-cyclodextrin (HP-β-CD, DS = 4.2) and methyl-β-cyclodextrin (Me-β-CD, DS = 12.5) were prepared. The effects of the complexation on the stability of puerarin were investigated in both solution and the solid state by methods of phase solubility study, XRD, DSC and SEM. Furthermore, the antioxidant activities of puerarin and puerarin/CDs inclusion complexes were determined by reducing power and 1,1-diphenyl-2-picryl-hydrazyl methods. Results showed that puerarin formed 1:1 stoichiometric inclusion complexes with β-CD, HP-β-CD and Me-β-CD. Additionally, the solubility and thermal stability of puerarin was improved after encapsulating by CDs. Antioxidant activity studies showed that the antioxidant performance of the inclusion complex was better than the native puerarin, and puerarin/Me-β-CD complex was the most effective form. It can be a potentially promising way to develop a new formulation of puerarin for herbal medicine or healthcare products.
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LANGMUIR
·
2024
·
IF 3.7
Xiaowei Hu,Shangan Chen,Heqing Jiang,Haoxiang Guo,Changwu Hu,Lu Wang,Shaohua Shen
This study investigates the dynamic properties of air–liquid interfacial tension for hydrophilic TiO2 P25 utilizing the pendant drop method. Additionally, it examines the interfacial adsorption mechanism of hydrophilic TiO2 particles, considering the characteristics of particle surface charge distribution in relation to ion regulation to enhance particle interface adsorption. Experimental results reveal that in the absence of ion addition, the TiO2 P25 suspension system exhibits limited interfacial adsorption due to its superhydrophilicity, regardless of particle concentration. The addition of NaCl increases the surface charge density of the particles, strengthens the electrostatic attraction between particles and the interface, and enhances particle adsorption. Specifically, at a low NaCl concentration (0.01 wt %), the increased surface charge density and contact angle of the particles elevate particle activity and high interfacial packing density. At a higher NaCl concentration (0.1 wt %), while NaCl further increases the particle contact angle, the increased effective cross-sectional area of the air–liquid interface occupied by individual particles leads to a reduction in surface free energy. Despite the enhanced electrostatic attraction, this results in a lower packing density.
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Desalination and Water Treatment
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2024
·
IF 1
Yue Yang,Xingan Wu,Xueru Sheng,Jian Zhang,Peng Lu,Na Li,Qingwei Ping
Novel modified cellulose/biochar beads (MCBBs) were prepared and utilized as support to immobilize laccase to remove phenol from an aqueous system. Nano CaCO 3 was introduced in CBBs prepared stage to produce proper pore structure by reacting with HCl solution. CBBs were then modified with maleic anhydride to introduce carboxyl groups. By adsorption and covalent bonding, the laccase was immobilized on the MCBBs. The pH, laccase concentration, and contact time were chosen as the main parameters in the laccase immobilizing experiment and the effects of these parameters on immobilization rates and recovered activity were studied. The results demonstrated that the best conditions are: pH 4.0, concentration 8 g L –1 , and contact time 6 h. The thermal and operational stability of the immobilized laccase has attended a good performance under these conditions. The immobilized laccase was used to degrade phenol in an aqueous system and 40.97% removal was achieved after 72 h. The results suggest that as a new green material, MCBBs can be good support for immobilizing laccase. This technique has potential advantages in removing phenol from wastewater.
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Nano Energy
·
2020
·
IF 16.602
Huajin He,Fucheng Ren,Jianping Zhu,Yuxuan Xiang,Bizhu Zheng,Sheng Li,Shijian Chen,Yixiao Li,Qi-Hui Wu,Yong Yang
Li-SF 6 battery has been proposed as a novel energy conversion device for both reducing greenhouse-effect SF 6 and potentially providing large specific energy . However, the real discharge process of SF 6 remains ambiguous with fast cathode passivation and large polarization. Here we report that the Li-SF 6 chemistry is able to deliver an unprecedented capacity of >20,000 mA h g c −1 with reduced polarization and excellent rate capability by using a low-cost, high-surface-area porous carbon as cathode host. More importantly, by adjusting the SF 6 atmosphere, an approximately eight-electron transfer process with predominant products of LiF and Li 2 S is realized via two voltage steps, whereas previously only a little Li 2 S could be found with one plateau appearing. The eight-electron process leads to a high energy density about 2,300 W h kg −1 based on the mass of carbon and discharge products, which sheds light on SF 6 as a promising high-energy-density cathode.
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JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
·
2025
·
IF 3.4
Pinzhen Chen
This study proposes an acid-etching surface treatment technology for treating the surface of carbon fiber/epoxy composites (CF/EP) to improve their physical and chemical properties, thereby achieving good adhesion with thermoplastic resins and high-quality resistance welding of CF/EP. The research shows that treating the CF/EP surface with concentrated sulfuric acid at 50°C for 45 minutes can significantly improve the single lap shear strength (LSS) of the CF/EP welding joint to 21.47 ± 1.2 MPa, which is 163.11% ± 14% higher than the LSS of the untreated sample. The acid etching surface treatment technology proposed in this paper is low-cost, simple to operate, and easy to replicate, combining innovation, feasibility, and economy. By analyzing the surface morphology, wettability, and chemical groups of the surface-treated samples, it can be seen that acid-etching treatment at an appropriate temperature and for a reasonable time can increase the surface roughness of CF/EP and introduce oxygen-containing chemical groups to the CF/EP surface, enhancing the wettability of the CF/EP surface and thereby improving the physical embedding and chemical bonding capabilities of the CF/EP surface.
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EXPERIMENTS IN FLUIDS
·
2020
·Vol. 61
·期 3
·1-12
·
IF 2.335
Wang Dongbao,Wang Junfeng,Yongphet Piyaphong,Wang Xiaoying,Zuo Ziwen,Li Bin,Zhang Wei
Electrical manipulation technique to produce qualified size of droplets has received substantial attention due to its wide applications in biology, medicine and chemistry, where the droplet behaviors could be controlled by adjusting external parameters. Characterization of charged droplet generation and breakup processes is crucial for understanding the basic mechanism of droplet manipulation. In this paper, the formation and breakup processes for charged droplets in dielectric immiscible oil were investigated experimentally at micro-scale by utilizing high-speed photography. The droplet behaviors at the ambient of needle orifice were visualized and captured at various electric field strengths and flow rates while its generation and motion characteristics were analyzed. Novel formation process of micro-droplets emitted from arrayed jets was found and depicted in detail when violent liquid breakup occurred at high voltage. Furthermore, the relationships of electric field and flow rate with characteristics of charged droplet behavior were quantitatively discussed. By consideration of electric field and flow rate, a scaling law to predict droplet size distributions was derived. Besides, a dimensionless model to predict charged droplet positions was given, which showed a linear increasing trend with electric field and time.
Graphic abstract
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危险品化学品经营许可证（带存储）