JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 24
·期 4
·997-1006
·
IF 2.646
Song Haishen,Yuan Hailiang,Chen Hezhang,Tang Anping,Xu Guorong,Liu Lihua,Zhang Zhian,Kuang Qiujuan
The commercial application of lithium-sulfur (Li-S) battery is hampered by the insulating characteristic and dissolution problem of sulfur and lithium polysulfides. Herein, a mesoporous TiO 2 @PPy material has been fabricated to act as the chemical immobilizer for sulfur species in Li-S battery. In the structure, PPy layer is covered uniformly on surface of the mesoprous TiO 2 , forming a core-shell structure. The well-developed mesopores act as the reservoir for sulfur, while the PPy layer improves the conductivity of material and further prevents diffusion of soluble polysulfides. The synthesized TiO 2 /S@PPy composite delivers an improved rate capability and cycling stability, with an initial discharge specific capacity of 1013.7 mAh g −1 at 0.1 C. In addition, the composite reserves a high capacity of 567.0 mAh g −1 after 300 cycles at 0.5 C, with a decreasing rate of 0.103% per cycle.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2026
·
IF 4.3
Qi Li,Qi Zhang,Feng Wang
Conjugated porous polymers (CPPs) represent a novel class of photocatalysts for hydrogen peroxide (H 2 O 2 ) production. Their photocatalytic activity can be enhanced through rational design of the electronic structures. Herein, three donor–acceptor (D–A) type CPPs with expanded saddle-shaped structures were constructed by copolymerizing dibenzothiophene-S,S-dioxide with different electron donating units, including triphenylamine, 1,3,5-triphenylbenzene, and 2,4,6-triphenyltriazine. Among the prepared CPPs, the dibenzothiophene-S,S-dioxide-triazine-based polymer shows impressive photocatalytic H 2 O 2 production rate of 2.98 mmol g −1 h −1 under the optimal condition, which is among the top photocatalytic performance reported so far for the existing CPPs. Experimental and theoretical studies revealed that the introduction of triazine linkages not only prolongs carrier lifetime and increases charge separation efficiency, but also reduces the energy barrier for O 2 activation. This study elucidates that rational design of dibenzothiophene-S,S-dioxide-based photocatalysts by tailoring electron-donating strength, charge transfer orientation and O 2 adsorption sites is crucial for efficient H 2 O 2 production.
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高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 21
·3605-3614
·
IF 5.342
Guiting Chen,Dan Cheng,Wenyan Zou,Ziyan Cai,Yufeng Xie,Yaqi Chen,Baitian He,Hongqing Hao,Wei Yang,Yong Cao
Herein, a novel electron-deficient conjugated water/alcohol-soluble polyelectrolyte (WSPE) named PFSOPyCl-E, consisting of dibenzothiophene-S,S-dioxide, bispyridinium salts and fluorene with ethylene oxide side chains, was presented. Previously we have synthesized another WSPE (PFSOPyCl) composed of the same backbone as that of PFSOPyCl-E but with octyl side chains. PFSOPyCl and PFSOPyCl-E were applied as cathode buffer materials (CBMs) to inverted polymer solar cells (PSCs) of poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-ethylhexyl-3-fluorothithieno[3,4-b]thiophene-2-carboxylate-4,6-diyl] (PTB7):[6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) systems, and simultaneous enhancements in open-circuit voltage (Voc), short-circuit current density (Jsc) and fill factor (FF) could be achieved when inserting these cathode buffer layers (CBLs). It was found that these CBLs could build directed dipoles at the indium tin oxide (ITO)/active layer interfaces, leading to the reductions in the ITO work function (WF) and improvements in Voc for the modified devices. The Jsc and FFs of PSCs were increased by several mechanisms. Firstly, the energy level alignments between the reduced ITO WFs (4.30–4.32 eV), deep LUMO energy levels (ELUMO) of these CBLs (4.04–4.10 eV) and ELUMO of PC71BM (∼3.90 eV) could generate good ohmic contacts, facilitating electron extractions and transportations. Secondly, these CBLs were able to n-dope PC71BM at the interfaces, inducing efficient electron-transporting pathways in the devices. Moreover, these polar polymeric CBLs could improve the compatibilities between ITO and the active layers, thus decreasing the interfacial resistances. It is worth noting that PFSOPyCl-E showed better cathode-modifying performance than PFSOPyCl, probably since PFSOPyCl-E with ethylene oxide side chains of high polarity and flexibility possessed better wettability with ITO and smoother films than PFSOPyCl. Hence, the devices modified by PFSOPyCl-E displayed lower contact resistances and higher FFs and Jsc than the PFSOPyCl-modified ones. Therefore, this class of electron-deficient conjugated WSPEs are promising CBMs for high-performance PSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Wenbo Luan,Xiaodong Sui,Xiaoling Jian,Like Chang,Jiawei Xu,Longhai Guo,Teng Qiu,Jun Ye,Xinlin Tuo
The inherent trade-off among colloidal stability, reliable mechanical performance under thermal and thermo-oxidative aging, and reprocessability remains a critical bottleneck limiting the broader technological application of waterborne polyurethanes (WPU). Herein, inspired by the concepts of biomimetic artificial foldamers and reversible covalent cross-linking, we demonstrate an WPU system characterized by the synergism of a rigid poly(p-phenylene sulfone amide) based physical network and flexible thioctic acid (TA)-based dynamic S–S network. The strong interactions between PSA segments contribute to ordered H-bonding and π–π stacking, and the sulfone groups contribute to the improved thermal stability and the copolymerization compatibility with WPU. The TA linkages function as supplementary cross-linking and antioxidants, and their flexibility and metathesis reactions provide the kinetic possibility for the adjustment and rearrangement of the PSA network. Well-dispersed dispersion was constructed and produced an excellent elastomer by film formation. In comparison with the controlled blank sample, the dual network exhibited an increase on the tensile strength of 2.4 folds at room temperature, 67 folds at a high temperature of 120 °C, 7.2 folds after 7 days of aging at 120 °C, and 25 folds after three times of reprocessing by thermal pressing. The relatively high elongation at break and good toughness were also largely maintained under all the conditions. The heat deflection temperature increased by 133 °C. The rigid–flexible dual-network WPU, featuring unique environmental friendliness, operation feasibility together with unique thermal robustness, mechanical adaptability, and dynamic network reconfiguration capability represents an effective material platform for the potential high-end use such as high-temperature flexible electronics, stress-buffering components, and reconfigurable elastomeric structures.
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2026
·
IF 6.8
Mengchao Zhang,Bingbing Guo,Sifan Li,Jing Chen,Hongkun Li
Alkyne polycyclotrimerization has emerged as a versatile synthetic platform for the preparation of hyperbranched polyphenylenes. However, most existing systems rely on transition metal catalysts, suffer from harsh reaction conditions, and yield regioirregular polymers, which limit their practical applicability. Herein, we present a facile and efficient strategy for the synthesis of regioregular hyperbranched polymers via organocatalyzed polycyclotrimerization of activated terminal diynes. Specifically, the polymerization reactions of bis(aroylacetylene)s were conducted in dichloromethane (DCM) at 30 °C for 5 h in the presence of 4-dimethylaminopyridine (DMAP) and acetylacetone, affording five soluble hyperbranched poly(aroylarylene)s ( hb -PAAs) with high weight-average molecular weights of up to 1251000 g/mol in high yields of up to 90.7%. Notably, the polycyclotrimerization proceeds smoothly under open-air conditions without the need for moisture or oxygen exclusion. The hb -PAAs possess perfect 1,3,5-regiostructures, and high thermal stabilities with 5% weight loss temperatures up to 482 °C. The hb -PAA incorporating tetraarylethylene (TAE) moieties exhibits distinct aggregation-induced emission (AIE) characteristics. Furthermore, when doped into a poly(vinyl alcohol) (PVA) matrix, the polymers display room-temperature phosphorescence (RTP) properties, with phosphorescence lifetimes of up to 320 ms and phosphorescence quantum yields ( Φ p ) of up to 4.8%. This organocatalytic polycyclotrimerization provides a mild, metal-free route to regioregular hyperbranched polymers with tailored photophysical properties, showing great potential for advanced optoelectronic applications.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dong Gao,Xiao Ji,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu,Hongping Wu
Four new metal chalcogenides containing fluorine, Na 2 Ba 17 In 8 Q 21 F 18 (Q = S, Se), KBa 2 InQ 3 F 2 (Q = S, Se) were synthesized by the solid-state reactions, and their structures were determined by single crystal X-ray diffraction. To the best of our knowledge, they represent the first example of F-containing mixed alkali and alkaline earth In-based chalcogenides . Structurally, Na 2 Ba 17 In 8 Q 21 F 18 (Q = S, Se), KBa 2 InQ 3 F 2 (Q = S, Se) all feature one-dimensional chain-like structures composed of In-based polyhedra, but they are not isostructural. The optical property measurements indicate that KBa 2 InSe 3 F 2 and Na 2 Ba 17 In 8 Se 21 F 18 have relatively large birefringences (0.096 and 0.083 at 532 nm, respectively), which are larger than that of KBa 2 InS 3 F 2 (0.056 @ 532 nm) and Na 2 Ba 17 In 8 S 21 F 18 (0.041 @ 532 nm). Their structure-property relationship demonstrates that the large difference of birefringence among these compounds mainly arises from the different connection modes of InQ n (n = 4, 5) polyhedra. In addition, the first-principles calculations, UV–vis–NIR diffuse reflectance spectra and IR spectroscopy of title compounds have also been performed. The effect of M III /cation ratios on the polymerization of In–Q (Q=S, Se) units have been discussed.
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2015
·
IF 1.286
Jiangtao Liu,Guofei Chen,Xingzhong Fang
A series of isomeric poly(thioether imide)s (PTIs) containing thioether linkages were prepared by aromatic nucleophilic substitution reaction of isomeric bis(chlorophthalimide)s (BCPIs) and bisthiophenols. The glass transition temperatures (Tgs) of the isomeric PTIs were 190–264°C, the 5% weight loss temperature (T5%) reached up to 441–508°C under nitrogen and 472–520°C in air atmospheres, respectively. It was found that the Tg values of the PTIs from three isomeric BCPIs with the same bisthiophenol increased in the order of 4,4′-BCPI < 3,4′-BCPI < 3,3′-BCPI, while the T5% values gradually decreased in the order of 4,4′-BCPI > 3,4′-BCPI > 3,3′-BCPI. Flexible films that could be cast from the polymer solutions exhibited good mechanical properties with tensile strengths of 91–121 MPa, elongations at break of 8–12%, and tensile moduli of 2.2–2.6 GPa. The minimum melt viscosity of isomeric PTIs decreased with increasing the content of asymmetric 3,4′-substituted phthalimide unit, and the PTI (2c) showed the lowest melt viscosity about 760 Pa·s at 264°C among these isomeric polymers.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Worku Lakew Kebede,Dong-Hau Kuo,Xiaoyun Chen
Environment and energy are presently some of the highest priority topics for mankind that need to be addressed. Organic pollutants are toxic and carcinogenic for human and aquatic life hence their presence in water even in low concentrations can cause serious health problems. Photodegradation of organic pollutants by utilizing oxide-based heterostructure photocatalysts is the promising approach to carry out remediation efficiently ascribed to the advanced optoelectronic and structural superiority of oxide photocatalysts. The Zn(O,S)/Mo(O,S) 2 composites were synthesized via a facile solvothermal method at low temperatures. Several methods were used to characterize the composite morphology, structure, electrical conductivity, chemical composition, and optical characteristics. The heterostructured Zn(O,S)/Mo(O,S) 2 oxysulfide was employed successfully in the photocatalytic degradation of organic pollutants. Among the as-prepared samples, the 30-ZnMoOS composite catalyst was found to have the highest photodegradation performance on various organic dye pollutants. The photocatalytic activity of the as-synthesized Zn(O,S)/Mo(O,S) 2 samples was assessed on the photodegradation of different kinds of organic dyes under visible light irradiation. The photocatalytic degradation efficiency of 30-ZnMoOS composite over 10 ppm neutral red (NR), methylene blue (MB), rhodamine B (Rh B), and methyl orange (MO) was found to be 99.6 %, 99.9 %, 99.5 %, and 98.8 % within 40, 45, 180, and 180 min, respectively, under visible light illumination. In the present photocatalytic system, the superoxide ( . O 2 - ) anions, hydroxyl ( . OH) radicals, and holes (h + ) are proposed to be the direct reactive species causing the photodegradation of organic dyes.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Liming Yang,Guangzhen Liu,Zhenglin Chen,Zhiyan Guo,Tian Liu,Hui Shi,Penghui Shao,Xianchuan Xie,Wenwei Li,Xubiao Luo
Transition metal sulfides have demonstrated excellent heavy metal detoxification in previous studies. However, the activity of their S-functional sites is usually not maximized because they are not precisely regulated. Herein, we report a new short-term cathodic tuned CuS crystals (C-tuned CuS) distortion strategy, ultrafast detoxicating over 95% Cr(VI) in 1 min，its detoxification rate was elevated by five orders of magnitude times compared to the untuned one. The high Cr(VI) detoxification performance is mainly attributed to the layered sulfur atoms tuning within series of cathodic potential shown by In-situ Raman. Besides, the four-tuning stages of C-tuned CuS lattice distortion based on the variation of Raman peak height and redshift changes was investigated by density functional theory (DFT) calculations, showing that the S-S bonds was stretched under cathodic tuning, extending from 2.106 to 2.345 Å. The stretched S-S bonds with enhanced polarity and electron activity prevailed the formation of transient Cr-S bonds with Cr(VI), favoring the direct electron transfer without O mediation, thus reducing the Cr(VI) reduction energy barrier. Cathodic tuning CuS crystal distortion, a “Plug and Play” strategy, show a new electron-level microscopic insights into wastewater reduction techniques development.
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Ni Luo,Cheng Chen,Dingming Yang,Wenyuan Hu,Faqin Dong
In the field of photocatalysis , one focus is on high-performance visible light catalysis. For this study, which follows the defect engineering strategy, ultrathin two-dimensional (2D) S defect-rich MoS 2 nanosheets were created in situ by ball-milling MoS 2 nanosheets with ascorbic acid and then used for the removal of Cr(VI) from wastewater. The results show that ascorbic acid increases both the specific surface area of MoS 2 nanosheets and the concentration of S stripping-defects significantly. Of the samples, D-MoS 2 -3 (i.e., S defect-rich ultrathin 2D MoS 2 nanosheets) exhibited the best Cr(VI) adsorption capacity and photocatalytic activity thanks to its large specific surface area and a high concentration of total S defects (18.5%), 311.1% better than for P-MoS 2 (i.e., pristine MoS 2 nanosheets) (4.5%). The concentration of S point-defects in D-MoS 2 -3 is only a little greater than in P-MoS 2 , but the concentration of S stripping-defects is significantly greater. S point-defects at such a high concentration readily act as recombination centers for photogenerated carriers. By contrast, S stripping-defects that lack dangling Mo-S bonds trap photogenerated holes and add to the separation efficiency of photogenerated electron-hole pairs. As a consequence, the photocatalytic performance of D-MoS 2 -3 in removing Cr(VI) is significantly better. Given this finding, the present study offers a new design pathway and a reference for the practical application of defect engineering to ultrathin 2D materials.
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Yangyang Zhang,Yiping Guo,Bijun Fang,Yujie Chen,Huanan Duan,Hua Li,Hezhou Liu
BiO 2 CH 3 nanoplate, a new organometallic crystal, with octagonal morphology is successfully prepared using methanol solvothermal method and further employed as template to fabricate porous β-Bi 2 O 3 octagonal nanoplates with a thickness of less than 50 nm. Then a series of hierarchical octagonal haystack-like β-Bi 2 O 3 /Bi 2 S 3 hybrids with large heterointerface and small bandgaps (1.36–1.44 eV) are constructed. It is found that, different from many regular photocatalysts that suffer from shrink of photocatalytic efficiency, the photoactivities of all β-Bi 2 O 3 /Bi 2 S 3 heterostructures are continuously enhanced with growing test cycles, owing to the formation of Bi 2 O 3− x S x solid solution, in which the built-in electric filed induced by lattice distortion can brings about higher e − /h + separation efficiency. The gradually increasing photocatalytic activity can reach to an up limit in about 5 photocatalytic cycles and maintain at this level. β-Bi 2 O 3 /Bi 2 S 3 heterostructure loaded with 20 mol% of Bi 2 S 3 is demonstrated to be the best photocatalyst and capable of fully decomposing Rh B in 30 min. Our work provides deep insights into the nature of the inversed photocatalytic behavior and facilitates the advanced design of photocatalysts with unabated photoactivities.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2023
·
IF 3.4
Lingzhi Zhang,Rui Zhou,Xiaoli Fu,Guangya Zhang,Lijuan Zhang,Shu-Feng Zhou,Wei Jiang
The synthesis of chiral intermediates for the traditional antidepressant duloxetine has gained significant attention as the number of depressed patients continues to grow. S - N , N -Dimethyl-3-hydroxy-3-(2-thienyl)-1-propanamide ( S -DHTP) is a critical intermediate in the synthesis of duloxetine, and the chemical synthesis process is complex and environmentally unfriendly. Reduced nicotinamide adenine dinucleotide phosphate (NADPH) is a major cost driver in the biocatalytic production of S -DHTP from N , N -Dimethyl-3-keto-3-(2-thienyl)-1-propanamide (DKTP). Here, we successfully modified the coenzyme preference of an aldo-keto reductase (AKR7-2-1) to use the cheaper reduced nicotinamide adenine dinucleotide (NADH) through a coenzyme preference modification approach. We utilized protein engineering to create a superior mutant, Y53F, which increased the coenzyme specificity of AKR7-2-1 by 875-fold and improved its thermal stability , enhancing its potential for industrial applications. Molecular dynamics simulations were performed to demonstrate the effect of mutations at key sites on the protein, revealing the altered coenzyme preference and increased thermal stability from structural and energetic changes. This study validates the viability of the coenzyme preference modification strategy for aldo-keto reductase, offering valuable insights for fellow researchers and guiding future investigations.
研究领域:
生物化学
·
制药工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）