ChemElectroChem
·
2022
·Vol. 9
·期 9
·e202200301
·
IF 4.782
Shuang Xia,Wen Huang,Wenqi Yan,Xinhai Yuan,Xi Chen,Lili Liu,Lijun Fu,Yusong Zhu,Qinhong Huang,Yuping Wu,Teunis van Ree,Rudolf Holze
Graphical Separators for advanced Li−S batteries were prepared using spherical rutile TiO 2 with oxygen vacancies and three-dimensional interconnected graphene-like carbon. As an advanced energy-storage system, Li−S batteries have attracted much attention, but there is still a series of problems hindering their commercialization, such as the ‘shuttle effect’ and corrosion of lithium anodes. To alleviate these two important problems simultaneously, we modified the separators with spherical rutile TiO 2 with oxygen vacancies (abbreviated OT) and three-dimensional interconnected graphene-like carbon (abbreviated GC) for advanced Li−S batteries to improve the electrochemical performance. The modified separators (abbreviation OTCD) have low charge transfer impedance, a catalytic effect on polysulfides, and a barrier effect on polysulfides, which can suppress the ‘shuttle effect’ and prevents the corrosion of lithium anodes in Li−S batteries. The as-prepared Li−S batteries show good cycling stability for 250 cycles with 0.048 % capacity decay per cycle at 1 C. Moreover, the SEM images of lithium anodes after 50 cycles showed that the lithium anodes were uncorroded. This work provides a practical and effective reference for the advanced Li−S batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yanrui Hao,Hao Guo,Fan Yang,Junye Zhang,Ning Wu,Mingyue Wang,Cuiliu Li,Wu Yang
Multi-walled carbon nanotube (MWCNT)/Ni-Mn-S composites are derived from MWCNT/Ni/Mn bimetallic metal-organic framework (MOF) for supercapacitor electrodes. Electroconductive MWCNT is introduced into Ni-Mn-S to form a three-dimensional interconnected structure due to the covalent interaction between Ni atoms and C atoms. During energy storage, MWCNT serves as miniature current collector to shorten pathway of electron collection and transmission. In addition, S 2- etching agent with Kirkendall effect makes edges and surfaces of the resulted sulfide structures rougher provide more active sites and improves electrochemical performance compared with precursors. By finely adjusting Ni/Mn molar ratio, the prepared MWCNT/Ni-Mn-S composite achieves excellent properties. As-prepared MWCNT/Ni-Mn-S(3:2) exhibits high specific capacitance of 1041 mAh g −1 at 1 A g −1 and good cyclic stability. The capacitance retention reaches 83.3% after 10,000 cycles. The assembled MWCNT/Ni-Mn-S(3:2)//AC hybrid supercapacitor (HSC) also shows high energy density of 25.33 Wh Kg −1 at power density of 829 W Kg −1 and outstanding cycling stability (93.3% after 20,000 cycles), which illustrates MWCNT/Ni-Mn-S(3:2) has important potential in supercapacitor.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Xu Xu,Chaonan Jiao,Hao Yang,Hao Chen,Jing Wang
Au NPs generated in situ by photochemical reduction method were used as catalysts for the oxidation of sodium cholate . The circular dichroism of the oxidation product of sodium cholate exhibits a positive Cotton effect at 335 nm and an intense negative Cotton effect at 281 nm. Electrospray ionization (ESI) mass spectra and nuclear magnetic resonance (NMR) spectra were performed to characterize the chemical composition of the oxidation product of sodium cholate, revealing that two of the hydroxyl groups were selectively oxidized to oxo groups and the oxidation product is 12-hydroxy-3,7-diketo-cholanic acid (3,7-DKCA). The chiral recognition abilities of the aggregates of 3,7-DKCA were investigated by using planar chiral molecules R- and S-binaphthyl compounds. Compared with sodium cholate, the aggregates of 3,7-DKCA displayed higher chiral selective host–guest binding to the model molecules and the chiral recognition mechanism was clarified.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xinxin Yuan,Jieyi Yang,Yiyang Yao,Hui Shen,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
Single-phase photocatalysts exhibit low performance of photocatalytic degradation of pollutants, which is mainly due to the fact that most intrinsic photocatalysts can only produce one active species for degradation reactions. In order to solve this problem, the 0D/2D Cu 2 O/BiOCl S-scheme heterojunction was successfully constructed through a facile hydrothermal route. The obtained 0D/2D Cu 2 O/BiOCl displays high catalytic activity for tetracycline (TC) photodegradation, and 90.3% of TC was photodegraded within 80 min, which is much better than that by pure Cu 2 O and BiOCl. The excellent photocatalytic activity can be ascribed to the formation of S-scheme heterostructures, which enables the photocatalyst to generate superoxide radicals and hydroxyl radicals, and at the same time, makes the oxidation potential more positive and the reduction potential more negative. It is further proved by the results of experimental characterization and theoretical calculation show that the built-in electric field between Cu 2 O and BiOCl is a key factor in inducing the path of S-scheme electron transmission. In addition, the effects of various reaction conditions, including catalyst dosage, pH value and reaction temperature, on the photodegradation of tetracycline were discussed in detail. The intermediates and degradation path were also discussed in detail by liquid chromatography-mass spectrometry.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 16
·7909-7922
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IF 4.682
Chai Chaofan,Yang Xuefang,Yang Xiaohua,Dong Chuan,Bian Wei,Choi Martin M. F.
Abstract The utilization of nanomaterial-based probes in detecting glutathione (GSH) and cell imaging has aroused extensive attention owing to the excellent properties of nanoprobes. Herein, we have synthesized manganese dioxide-S, O co-doped graphitic carbon nitride quantum dots (MnO 2 -S, O-CNQDs) nanocomposite by in situ synthesis of MnO 2 nanosheets in S,O-CNQDs dispersion solution. It was found that GSH could specifically bind to MnO 2 -S, O-CNQDs so that the fluorescence of S, O-CNQDs could be recovered. As such, a “turn-on” MnO 2 -S, O-CNQDs nanoprobe can be fabricated and applied to rapidly determine trace amounts of GSH. Under the optimal conditions, MnO 2 -S, O-CNQDs shows sensitive response to GSH in the range 10–270 μM with a detection limit of 0.307 μM ( S / N = 3). The developed MnO 2 -S, O-CNQDs probe has demonstrated great potential to detection of GSH in biological samples and glutathione injections. What is more, MTT assay indicates that MnO 2 -S, O-CNQDs has low biotoxicity. The non-fluorescence MnO 2 -S, O-CNQDs reacts with GSH to recover the fluorescence of S, O-CNQDs in HepG2 cells. Thus, the “turn-on” fluorescence change of MnO 2 -S, O-CNQDs offers a potentially useful tool to monitor GSH of cancer cells. Graphical Abstract
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EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Zhaoyang Wang,Bo Jiang,Yunhe Zhang,Xuefeng Li,Yongpeng Wang,Yingshuang Shang,Haibo Zhang
The rapid development of high-speed communication networks (for example, 5G) has imposed more stringent requirements on the comprehensive performance of low dielectric constant (low- k ) polymeric materials, as an important member of which, fluoropolymer has gained much attention. In this study, a series of cross-linkable fluorinated poly(aryl ether)s with different phenylethynyl content have been synthesized through nucleophilic substitution reaction, then their polymeric films have been prepared and thermally cross-linked via phenylethynyl groups. Thermal, mechanical and dielectric properties of the films are systematically compared. Due to the presence of F atoms and cross-linked structure in polymer chains, these polymeric films exhibit remarkable dielectric properties with the lowest dielectric constant < 2.4 and dissipation factor < 0.003 at frequency from 100 Hz to 1 MHz. Moreover, the dielectric performance shows impressive temperature independence before 200 °C. Excellent mechanical properties of the films have been corroborated by the DMA data of Young’s modulus > 1.50 GPa and modulus retention rate > 70%. It is noteworthy that polymeric films possess very low dielectric constant and dielectric loss at high frequency of 10 GHz, of which the lowest values can reach 2.47 and 0.0018, respectively. The polymeric films constructed in this study have shown great application prospects in the field of high-speed communication.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 8
·4115-4124
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IF 2.047
Li Jiaojiao,Xiao Zhen,Zhou Xiaozheng,Zhang Wenkui,Zhang Jun,Gan Yongping,Huang Hui,He Xinping,Wang Guoguang,Xia Yang
Lithium-sulfur (Li-S) batteries are a promising electrochemical energy storage device due to their low cost, high energy density, and excellent sustainability, making them superior to many commercial lithium-ion batteries. Despite the great road to market, Li-S batteries still suffer from low practical energy density, which is intimately related to fundamental scientific and technological issues of sulfur cathodes. As a non-negligible parameter in sulfur cathodes, the compaction density plays a crucial role in the energy density of Li-S batteries. Herein, the effect of compaction density of sulfur/carbon cathodes on the electrochemical performance of Li-S batteries is investigated. It is demonstrated that sulfur/carbon cathodes with an optimized compaction density of 1.2 g cm −3 not only can guarantee the good contact of active materials, but can also ensure the rational dosage of electrolyte, thereby increasing the sulfur utilization as well as reducing the dissolution of polysulfide into the electrolyte. As a result, the pouch cells paired with the sulfur/carbon cathode and Li metal anode deliver superior specific capacity and remarkable cycling performance, which is attributable to the better contact between particles and the faster redox kinetics. This work reveals the contribution of the compaction density of the sulfur cathode to the electrochemical performance of the Li-S battery, providing an instructive paradigm for the rational design of an advanced sulfur cathode for large-scale commercialized Li-S pouch cells.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 21
·10237-10245
·
IF 3.925
Yunfan Xu,Mengdong Guo,Shilong Lu,Zengyue Wei,Shengyu Feng
To reduce the pressing environmental concerns and negative environmental impact of non-recyclable materials, recyclable polymers pose promising and useful solutions. In this work, recyclable poly(sulfone siloxane)s were synthesized by the introduction of siloxane units into the main chain of aliphatic polysulfones via ring-opening polymerization of three types of sulfone-containing cyclosiloxane monomers with different lengths of alkyl segments. The results of wide-angle X-ray diffraction analysis revealed that the prepared polymers were amorphous. Thermal properties of the recyclable poly(sulfone siloxane)s were further investigated by differential scanning calorimetry and thermogravimetric analysis. Moreover, poly(sulfone siloxane)s were selectively depolymerized into the initial cyclic monomers using KHSO4 in an aqueous tetrahydrofuran solution at room temperature, suggesting the recyclability of the polymers. This work may provide a simple and useful strategy to design novel poly(sulfone siloxane)s with good solubility and recyclability.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Zongrui Li,Shengsheng Li,Liangzhong Li,Lin Tao,Xiaohui Zhu,Ruixue Ma,Bingbing Sun,Yanhong Zhang,Yunjiang Yu
The presence of microplastics (MPs) and the associated organic pollutants in the aquatic environment has attracted growing concern in recent years. MPs could compete with chemicals for adsorption sites on the surface of sediment, affecting the sorption processes of pollutants on sediment. However, few studies focused on the binary system of microplastics-sediment (MPs-S), which appear much common in aquatic environment. Herein, we investigated the interactions between a continuously used flame retardant tetrabromobisphenol A (TBBPA) and four MPs-S complexes (PVC–S, PE-S, PP-S and PS-S). The equilibrium adsorption capacities were 17.1, 15.6, 15.4, and 14.0 mg/kg for PVC-S, PS-S, PE-S, and PP-S, respectively. Kinetics suggest that adsorption behavior of TBBPA was fitted by pseudo-second-order model. Co-adsorption of TBBPA in binary systems were much lower than the sum of each simple system, which may be due to the mutually occupied adsorption sites. Higher ionic strength and lower dissolved organic matter strengthened the sorption of TBBPA onto MPs-S complexes. The enhanced sorption capacities for TBBPA were observed with elevated proportion and small particle size of MPs in the MPs-S complexes. This study contributes to the knowledge on the impact of MPs in partitioning of organic pollutants in-between solid and aqueous phases in the aquatic environment.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Quanlu Wang,Yikun Wang,Tingting Zhang,Yanmin Wang,Qiang Zhang,Tingxi Li,Yongqin Han
Metal-organic frameworks (MOFs) are promising candidates for supercapacitors due to their intrinsic porous structure. However, their low conductivity limits their supercapacitive performances. Herein, carbon cloth/ZIF67/polypyrrole composites (CZPAs) are prepared by first in-situ growing ZIF67 on carbon cloth and then electrochemical polymerizing pyrrole on carbon cloth/ZIF67 utilizing alizarin red S (ARS) as redox dopant. The synergistic effects of ZIF67 and ARS including porous structure, doping effect and inducing limited/ordered growth of polyprrole are contributed to the improved electrochemical performances. The resulted composite doped by 35 mM ARS (CZPA-35) achieves the highest areal capacitance of 1198 mF cm −2 among the CZPAs. The asymmetric supercapacitor assembled by CZPA-35 and carbon cloth/active carbon as flexible electrodes demonstrates high areal capacitance (288 mF cm −2 ), high energy density (57.6 μWh cm −2 ) and power density (300.96 μW cm −2 ). Moreover, the flexible supercapacitor provides excellent cycle stability after 5000 cycles (87.1% capacitance retention) and flexibility (85% capacitance retention after bending angle of 180 °). This strategy can be extended to fabricate other kinds of flexible MOF/PPy composites for the potential application of flexible wearable and portable electronic products.
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Science China-Materials
·
2022
·Vol. 65
·期 6
·1463-1475
·
IF 8.64
Zheng Xiao,Wang Zhilong,Li Jinjin,Wei Liangming
The rechargeable aluminum-sulfur (Al-S) battery is a promising alternative-energy storage device with high energy density and made of cheap raw materials. However, Al-S batteries face several obstacles, especially the shuttle effect. Herein, a binder-free S@Ti 3 C 2 T x sandwich structure film with uniform sulfur dispersion was designed. The two-dimensional (2D) layered material Ti 3 C 2 T x not only has the function of binder and conductive agent but also is a promising host for sulfur anchoring. As a result, S@Ti 3 C 2 T x film showed an initial capacity of 489 mA h g −1 at 300 mA g −1 and retained the value at 415 mA h g −1 after 280 stable cycles, with an average Coulombic efficiency of ∼95%. The film displayed higher capacity and stability than the S + Ti 3 C 2 T x cathode prepared by the slurry-coating method (the initial capacity was 317 mA h g −1 and then decayed to 222 mA h g −1 after 160 cycles). The main capacity of S@Ti 3 C 2 T x film in the Al-S battery came from the reversible redox reaction of S 2− and S. This new 2D material combined with a controllable electrode structure design paves the way for the development of Al-S batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Minghui Xiang,Zhen Lu,Siyang Li,Hui Li,Chen Wang,Jin Zhang,Lide Jin,Chunyang Li
In recent years, new heterogeneous catalysts derived from metal organic frameworks (MOFs) have been widely used in advanced oxidation processes (AOPs). In this work, zeolite imidazole framework-67 (ZIF-67) and sulfide nanozero-valent iron (S-Fe) were used as precursors to prepare S-Fe/Co bimetallic nanoparticles embedded in graphitized carbon (S-Fe/Co@GC) and used to activate peroxymonosulfate (PMS) to degrade tetrabromobisphenol A (TBBPA). Morphological and structural characterization indicated that S-Fe/Co@GC compared to pre-carbonization, the pore size of the material became larger, formed a graphite carbon skeleton with excellent electrical conductivity. In a 0.2 g/L S-Fe/Co@GC and 0.6 mM PMS system, 96.1% of TBBPA (20 mg/L) was degraded within 30 min, and the degradation yielded a total organic carbon (TOC) removal of 56.2% in 60 min. This excellent catalytic activity was attributed to the synergistic effect of graphitic carbon, sulfide nanozero-valent iron and metallic cobalt. Radical quenching experiments and electron paramagnetic resonance (EPR) technology indicated that reactive oxygen species (ROS) included HO • , SO 4 •− , O 2 •− and 1 O 2 , among which O 2 •− plays a leading role in the degradation of TBBPA. Based on the LC-MS analysis of the degradation intermediates, the degradation pathway of TBBPA in the S-Fe/Co@GC/PMS system was proposed. In addition, S-Fe/Co@GC showed a low ion leaching rate, and the regenerated S-Fe/Co@GC still had high catalytic performance. This work will extend the development of MOFs encapsulate functional nanoparticle materials for environmental remediation.
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