EUROPEAN POLYMER JOURNAL
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2021
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IF 4.598
Yajun Ren,ZhuanZhuan Zhang,Wenlong Xia,Qifeng Zhou,Xiaofeng Song
Poly(L-lactide) (PLLA) was one of the most well-known biodegradable polyesters. Although its thermo-responsive shape memory (SM) function has been studied by proper program, high transformation temperature is not suitable in some biomedical applications. Water-responsive SM polymer is an alternative choice and exhibits great potential because it is harmless to the cells and tissues of organisms. In the work, a novel PCL-(PMVS- s -PAA)-PCL-PTMG-PCL-(PMVS- s -PAA)-PCL copolymer was devised as an additive to endow PLLA with water-responsive SM capability. The incorporated PLLA was characterized by cross-section, water contact angle, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Inserted PTMG segment and assisted ambient temperature were contributed to its SM behaviors. The shape fixation ratio and shape recovery ratio were 92.0% and 94.2%, respectively. The schematic diagram between internal microstructures and macroscopic properties was proposed. At the same time, the incorporated PLLA showed excellent toughness. So the obtained SM material would be promising for medical and biomimetic fields.
研究领域:
材料科学
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生物医学工程
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高分子科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Ge Shu,Yuda Li,Zhuang Wang,Jia-Xing Jiang,Feng Wang
Conjugated polymers have recently emerged as encouraging metal-free photocatalysts for solar energy conversion under visible light irradiation. Unfortunately, photocatalytic activities of the current polymers are still inadequate. Herein, we present a simple but quite attractive conjugated homopolymer (PDBTSO) based a dibenzothiophene-S,S-dioxide moiety. The introduction of sulphonyl group to a polyfluorene-like backbone can cause richly available active sites and lead to the efficient separation of photoexcited charge carriers, thus yielding impressive photocatalytic performance. Furthermore, we explored a natural “phosphorylation” strategy for increasing photocatalytic hydrogen production over PDBTSO. Remarkably, an extremely high hydrogen evolution rate of 44.2 mmol h −1 g −1 was achieved with the optimum addition of K 2 HPO 4 under visible light irradiation.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Guiting Chen,Gaoheng Qian,Shuwang Yi,Zhicai He,Hong-Bin Wu,Wei Yang,Bin Zhang,Yong Cao
The development of effectively universal interfacial materials for both conventional and inverted polymer solar cells (PSCs) plays a very crucial role in achieving highly photovoltaic performance and feasible device engineering. In this study, two novel alcohol-soluble conjugated polymers (PBSON-P and PBSON-FEO) with bis(benzothiophene-S,S-dioxide)-fused aromatics (FBTO) as the core unit and amino as functional groups are synthesized. They are utilized as universal cathode interfacial layers for both conventional and inverted PSCs simultaneously. Ascribing to the enlarged conjugated planarity and higher electron affinity for an FBTO unit, both PBSON-P and PBSON-FEO exhibit versatile electron-transporting abilities. They show wide band gaps that are important for light absorption in inverted PSCs, at which point PBSON-P and PBSON-FEO are more progressive than some of the reported small band gap cathode interfacial materials. Importantly, PBSON-P and PBSON-FEO display deep highest occupied molecular orbital energy levels, which can block holes at the cathode and thus increase the fill factor. As a result, both conventional and inverted PSCs using PBSON-P and PBSON-FEO as cathode interlayers realize high photovoltaic performance. Therefore, this series of novel polymers are amphibious cathode interfacial materials for high-performance conventional and inverted PSCs.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Frontiers in Chemistry
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2019
·
IF 3.782
Chen Lizhu,Yu Yingjia,Duan Gengli,Wang Xin,Shen Baohua,Xiang Ping
Objective: Chiral analysis is a crucial method to differentiate selegiline intake from drug abuse. A dried urine spot (DUS) analytical method based on spotting urine samples (10 μL) onto dried spot collection cards, and followed by air-drying and extraction, was developed and validated for the determination of selegiline, desmethylselegiline, R/S-methamphetamine, and R/S-amphetamine.Methods: Methanol (0.5 mL) was found to be the ideal extraction solvent for target extraction from DUSs under orbital-horizontal stirring on a lateral shaker at 1,450 rpm for 30 min. Determinations were performed by direct electrospray ionization tandem mass spectrometry (ESI-MS/MS) under positive electrospray ionization conditions using multiple reaction monitoring mode. The chromatographic system consisted of a ChirobioticTM V2 column (2.1 × 250 mm, 5 μm) and a mobile phase of methanol containing 0.1% (v/v) glacial acetic acid and 0.02% (v/v) ammonium hydroxide.Results and conclusions: The calibration curves were linear from 50 to 5,000 ng/mL, with r > 0.995 for all analytes, imprecisions ≤ 15% and accuracies between −11.4 and 11.7%. Extraction recoveries ranged from 48.6 to 105.4% with coefficients of variation (CV) ≤ 13.7%, and matrix effects ranged from 45.4 to 104.1% with CV ≤ 10.3%. The lower limit of quantification was 50 ng/mL for each analyte. The present method is simple, rapid (accomplished in 12 min), sensitive, and validated by a pharmacokinetic study in human urine collected after a single oral administration of SG.
研究领域:
分析化学
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药理学
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毒理学
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产品关联
DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2023
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IF 10.9
Lei Feng,Ze-Min Zhu,Ying Yang,Zongbin He,Jiafeng Zou,Man-Bo Li,Yan Zhao,Zhikun Wu
Metal nanoclusters are rising stars in material science , and one advantage is their atomically precise tunability. It is well known that metal doping can efficiently modify the properties of metal nanoclusters. In particular, without altering the parent nanocluster framework, doping a single heterometal atom can tailor the properties of metal nanoclusters and aid investigations of the structure–property relationship of metal nanoclusters. To our knowledge, the simultaneous synthesis of a single heterometaldoped nanocluster and its parent nanocluster is challenging and has not been previously reported; however, this is highly desirable because it can prevent the influence of trace impurities and allow comparison between doped and undoped nanoclusters. The single Cd-doped gold nanocluster Au 22 Cd 1 (S-Adm) 16 (S-Adm = 1-adamantanethiolate) has been previously synthesized and structurally elucidated. However, the structure of the parent nanocluster, Au 23 (S-Adm) 16 , remains unknown, inspiring this investigation. In this study, we synthesized Au 23 (S-Adm) 16 and its single-doped Au 22 Cd 1 (S-Adm) 16 nanocluster in one pot for the first time, and we resolved their structures using single-crystal X-ray crystallography. The structure of Au 22 Cd 1 (S-Adm) 16 is similar to that of Au 23 (S-Adm) 16 except that a kernel Au atom in Au 23 (S-Adm) 16 is replaced with a Cd atom. This Cd replacement causes the kernel Au―Au bond length to increase owing to the loosening of the original closely packed structure. In contrast to prior reports, Au 23 (S-Adm) 16 is surprisingly more stable than Au 22 Cd 1 (S-Adm) 16 , as determined via ultraviolet visible-near infrared (UV-Vis-NIR) spectroscopy at 80 °C. This stability was attributed to the decrease in the kernel Au―Au bond length. Although the maximum absorption of Au 22 Cd 1 (S-Adm) 16 slightly red-shifted from 605 to 608 nm after Cd doping, the molar extinction coefficient of Au 23 (S-Adm) 16 at 605 nm was approximately twice that of Au 22 Cd 1 (S-Adm) 16 at 608 nm. Thus, the increase in kernel Au―Au bond length may decrease the photoexcitation electron transfer efficiency owing to lengthening of the photoexcitation electron transfer pathway. As further support for this opinion, although the two nanoclusters showed similar emission profiles and maxima (750 nm for Au 23 (S-Adm) 16 and 760 nm for Au 22 Cd 1 (S-Adm) 16 ), they exhibited obvious emission intensity differences. Specifically, the quantum yield of Au 23 (S-Adm) 16 (approximately 3.160 × 10 −5 ) was found to be 1.13 times that of Au 22 Cd 1 (S-Adm) 16 (approximately 2.793 × 10 −5 ). Thus, the stability and absorption and emission intensities correlate with the kernel Au―Au bond length. This study shows that two metal nanoclusters with slight structural differences can exhibit different properties in terms of optical and thermal stability, providing a good reference for studying their structure–property relationships. Download: Download high-res image (68KB) Download: Download full-size image
研究领域:
材料科学
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化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xiaodong Li,Lina Zhang,Yuxin Tian,Xiaotong Yin,Shi Su,Boxin Li,Wei Zhang
Composite photocatalyst have garnered considerable attention in the field of environmental remediation. In this study, we synthesized a one-dimensional (1D) core/shell AgVO 3 @SnIn 4 S 8 (AS) heterojunction photocatalyst by in situ growing SnIn 4 S 8 nanosheets on AgVO 3 nanorods utilizing a straightforward solvothermal approach. The resultant AS composite demonstrates exceptional photocatalytic efficiency in both degrading methyl orange (MO) and reducing Cr(VI) pollutants. The optimized AS-0.1 heterostructure is particularly noteworthy, achieving almost complete MO degradation (99.7 %) within just 15 min and effectively reducing Cr(VI) 99.4 % within 75 min. The reaction rate constant k for MO degradation by the AS-0.1 sample is 0.3654 min⁻¹ , which is 8.2 times higher than that of SnIn₄S₈ (0.0446 min⁻¹) and 609 times greater than that of AgVO₃ (0.0006 min⁻¹). Similarly, the degradation constant k for Cr(VI) reduction by AS-0.1 is 0.0656 min⁻¹ , surpassing that of SnIn₄S₈ by 5.2 times (0.0127 min⁻¹) and AgVO₃ (0.0003 min⁻¹) by 218.7 times. This significant enhancement in photocatalytic activity is primarily attributed to the increased number of active sites and the efficient S-scheme charge transfer mechanism, which is facilitated by the built-in electric field within the AS heterostructure. The S-scheme mechanism facilitates the efficient migration of photogenerated charge, and endows photoexcited electrons and holes with high redox capacity, thereby accelerating the photocatalytic reactions. Furthermore, the recovered samples retain their photocatalytic degradation performance after five consecutive experimental cycles, suggesting their excellent durability. This study is expected to motivate the rational design and fabrication of efficient composite photocatalysts, offering innovative solutions to water pollution challenges.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nano Energy
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2025
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IF 17.1
Zeshuang Kong,Dafeng Zhang,Junchang Liu,Xue-Yang Ji,Peiqing Cai,Xipeng Pu,Huayang Zhang
In the S-scheme heterojunction, photogenerated electrons from the oxidation photocatalyst recombine with holes from the reduction photocatalyst, enhancing redox potential and boosting photocatalytic activity. However, the recombination mechanism at these interfaces remains largely unexplored. In this study, we design a Cd 0.9 Zn 0.1 S/ZnWO 4 (CZS/ZWO) S-scheme heterojunction model guided by theoretical predictions. Remarkably, a nano-tetrapod-shaped CZS/ZWO S-scheme heterojunction is synthesized via a simple solvothermal and ultrasonic self-assembly method, achieving hydrogen evolution performance under visible light irradiation for 3 h that is 3.69 times higher than CZS alone and 4.63 times higher than ZWO alone. Further theoretical calculations simulate the charge transfer mechanism, electron density localization, and transition states in the photocatalytic hydrogen evolution reaction. Finally, integrating theoretical and experimental data, an S-Zn channel is proposed within the CZS/ZWO S-scheme heterojunction, clarifying the electron transfer pathway. This study provides a detailed understanding of charge transfer dynamics in S-scheme heterojunction.
研究领域:
材料科学
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光催化
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纳米材料
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表面科学
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能源化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2025
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IF 9.5
Han Liu,Jun Zhang,Quanlong Xu,Hong Tao,Tingmin Di,Quanrong Deng,Shenggao Wang
Artificial photosynthesis offers a viable strategy for sustainable and environmentally friendly H2O2 production. However, conventional inorganic semiconductor photocatalysts often face limitations such as restricted light absorption, inadequate redox ability, small specific surface area and poor stability, which greatly restrict their practical applications. Herein, an innovative inorganic/organic S-scheme heterojunction is fabricated by an electrostatic self-assembling method. The optimized BT-12 composite demonstrates a significantly enhanced photocatalytic H2O2 production rate of 723 μmol L−1, surpassing the rates achieved by pure Bi2WO6 and TpPa-Cl-COF by factors of 10 and 2.9, respectively. This improvement can be attributed to the synergistic effects of enhanced light absorption, increased specific surface area, and effective separation of charge carriers and redox active sites, as well as the strong redox ability induced by the S-scheme heterojunction. Density functional theory (DFT) calculations along with X-ray photoelectron spectroscopy (XPS) measurements and electron paramagnetic resonance (EPR) characterization confirm the step-by-step charge transfer pathway. The active species trapping experiments validate that H2O2 is predominantly produced by a two-step one-electron process. This work highlights an innovative and promising strategy for constructing a highly efficient photocatalytic system based on inorganic/organic heterojunctions.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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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.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
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IF 6.959
Yan Zhang,Chuang Chen,Qiu-Hui Zheng,Zhan-Kuo Guo,Bao-Xia Dong,Yun-Lei Teng
Metal heteroatom doped carbon materials display remarkable catalytic performance in the electrochemical CO2 reduction (ECR) because the doped heteroatoms can significantly change the local density of state and electronic structure of carbon, which induces charge polarization or structural defects. Herein, we synthesized S-doped NiII-triazolate precursors with high purity and crystallinity through a simple one-step hydrothermal method. The high-temperature pyrolysis process produced a series of Ni–S–CT (T = 800, 900, 1000 °C) materials with Ni3S2 as the main component. It resulted in significant carbon structure defects in the catalyst, which increased the specific surface area and pore volume, providing a basis for improving the ECR activity. Through the structural characterizations of powder X-ray diffraction (PXRD), Raman, X-ray photoelectron (XPS), Brunauer–Emmett–Teller (BET), transmission electron microscopy (TEM), and electrochemical characterizations of linear sweep voltammetry (LSV), chronoamperometry (i–t curve), electrochemical impedance spectroscopy (EIS), and electrochemical active surface area (ECSA), as well as gaseous product analysis, we can build the structural-performance relationship. Ni–S–CT catalysts all reached the highest CO Faraday efficiency at −1.5 V vs Ag/AgCl potential, among which Ni–S–C1000 exhibited the best catalytic activity (FECO of 66.6% and jCO of 1.28 mA/cm2). It also displayed excellent stability and recyclability, which could realize the efficient reuse of the catalyst. In addition, the density functional theory (DFT) calculation was carried out on Ni3S2 to illustrate the ECR activity origination. It is the first report on Ni3S2-based catalysts in the application of ECR.
研究领域:
材料科学
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电化学
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催化作用
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产品关联
DOI
高影响因子
FUEL
·
2021
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IF 6.609
Xinyue Zhang,Bo Zhang,Yanjun Chen,Lei Li,Houxiang Sun,Xuandong Liu,Rong Guo,Bo Meng,Peng Liu,Weiyu Song,Qiaoxia Guo,Baojian Shen
Electronic structure tuning is an effective strategy to activate transition metals. In this study, silica-promoted γ-Al 2 O 3 -supported Fe-based hydrodesulfurization catalysts of Fe species with electron loss were successfully prepared by transferring electrons from Fe to Si. The characterization results showed that the Fe-based hydrodesulfurization catalyst with the addition of silica modulated the structure and properties of the active metal, which not only improved the degree of sulfidation of the active metal but also promoted the generation of Fe(III)-S. The hydrodesulfurization rate of dibenzothiophene showed a remarkable rise from 38.4 to 83.2% at 673 K. Importantly, the formation of Fe(III)-S greatly stretched the bond length of Fe-S bonds, exhibiting an increase of approximately 21%, this facilitating the generation of coordinatively unsaturated active site. Finally, the HDS reaction performance of the Fe-based hydrodesulfurization catalysts was mainly influenced by the Fe(III)-S/Fe(II)-S ratio, with the most significant enhancement in the direct desulfurization reaction path. The results of this study provide a promising approach for the design and development of environmentally friendly and economical Fe-based catalysts in the field of clean fuels.
研究领域:
催化
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化学工程
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材料科学
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环境化学
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DOI
高影响因子
Advanced Energy and Sustainability Research
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2022
·Vol. 3
·期 12
·2200138
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IF 0
Linlin Zhang,Lu Liu,Xiaodong Zhang,Chengjun Ge,Jianjun Liao
Pharmaceuticals and personal care products (PPCPs) have attracted widespread attention due to their durability to the environment. Therefore, it is highly desirable to develop new technologies that are environmentally friendly, energy saving, and compatible to degrade these pollutants. In this study, a vis–NIR-driven and highly efficient S-scheme photocatalyst, WO 3− x /S doped g-C 3 N 4 , is used for PPCPs degradation. The results show that the photocatalytic activity of WO 3− x /S doped g-C 3 N 4 composite system for PPCPs is much higher than that of WO 3− x and g-C 3 N 4 . The introduced WO 3− x has a great positive effect on the photocatalytic performance of WO 3− x /S doped g-C 3 N 4 S-scheme composite photocatalyst for both naproxen and diclofenac. Due to the fast photogenerated carrier separation brought by the S-scheme, the WO 3− x /S-doped g-C 3 N 4 nanocomposite exhibits enhanced performance in photocatalytic PPCPs degradation. The degradation rate of naproxen is 99.2%, and the degradation rate of diclofenac can also be as high as 99.5%. This research has important reference value for the synthesis of WO 3 -based S-scheme photocatalysts for energy and environmental applications.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
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