CARBON
·
2026
·
IF 11.6
Yanan Zheng,Hao Xu,Xinyi Hou,Xuefeng Yan,Xiaohui Jiang,Liangmin Yu
Heteroatom doping, by synergistically regulating defect concentration, dielectric loss factors, and conductive behavior, enables precise tailoring of the electromagnetic response in carbon-based materials. In this study, lunar-like nitrogen (N), chlorine (Cl) co-doped porous carbon microspheres (N, Cl-PCMs) were fabricated via a hydrothermal–pyrolysis method using a self-synthesized N, Cl-containing compound as the dopant. By adjusting the doping level, controllable morphology and tunable electromagnetic responses were achieved. The heteroatoms create heterogeneous interfaces and defects that act as efficient polarization sites, thereby promoting polarization relaxation while optimizing the conductive network for improved conductive loss. Multiple attenuation mechanisms synergistically enable optimized impedance matching and efficient electromagnetic attenuation. The optimal N, Cl-PCMs-2 exhibits remarkable electromagnetic wave absorption (EMWA) performance, with a minimum reflection loss (RL min ) of −56.00 dB at 2.99 mm and an effective absorption bandwidth (EAB) widened to 5.44 GHz at 2.22 mm. Radar cross-section (RCS) simulations further demonstrated a maximum reduction of 27.45 dB m 2 at 0°, confirming its promise for multiband electromagnetic stealth. This work provides new insight into the multiscale structure of biomass-derived carbons for green, high-performance electromagnetic absorption absorbers.
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高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 22
·6687-6703
·
IF 6.177
Furong Cao,Yun Wang,Xing Wang,Wenjuan Zhang,Gregory A. Solan,Rui Wang,Yanping Ma,Xiang Hao,Wen-Hua Sun
Five types of N-(2-(diphenylphosphino)ethyl)-2-R-5,6,7,8-tetrahydroquinolin-8-amines (R = H L1, Me L2, iPr L3, Cl L4, Ph L5) along with one example of an N-isopropyl-5,6,7,8-tetrahydroquinolin-8-amine (L6) have been prepared and employed as neutral ligand supports for zinc(II) chloride complexes, LZnCl2 (Zn1–Zn6). All zinc compounds were characterized by multinuclear NMR spectroscopy (1H/13C/31P) and elemental analysis, while the structures of Zn2 and Zn5 were further studied by single crystal X-ray diffraction: distorted tetrahedral geometries with the diphenylphosphine moieties non-coordinated were a feature. Pre-treatment of Zn1–Zn5 with two equivalents of either LiCH2SiMe3 or LiN(SiMe3)2 led to catalysts displaying good to exceptionally high activity for the ring opening polymerization (ROP) of ε-caprolactone (ε-CL) at 50 °C. For example, Zn4/2LiCH2SiMe3 displayed a TOF of 2.1 × 104 h−1 with 71% conversion seen within 10 minutes with the ε-CL : Zn molar ratio at 5000 : 1; the resulting polycaprolactone (PCL) comprised predominately cyclic structures along with lower levels of trimethylsilylmethyl-capped linear PCL. By comparison, Zn1–Zn5 on treatment with two equivalents of LiN(SiMe3)2 at the same high monomer to zinc ratio, led to catalysts exhibiting an order of magnitude higher activity. Zn1/2LiN(SiMe3)2 in the presence of BnOH exhibited a remarkable TOF of 1.35 × 105 h−1 with 90% monomer conversion within two minutes. In these cases, a distinct selectivity towards linear polymers capped with CH3O end-groups (derived from the quenching solvent) was observed with cyclic polyesters only observable with larger amounts of ε-CL. As a general observation, the 2-R substituent on the chelating ligand showed noticeable effects on the efficiency and on the molecular weight of the PCLs, with 2-Cl-containing Zn4 in combination with LiCH2SiMe3 and BnOH affording the highest molecular weight PCL of the study (9.57 × 104 g mol−1). Based on the microstructural properties of the PCL, distinct mechanisms (viz., coordination–insertion and ring expansion) have been proposed to account for the mode of propagation mediated by Zn/2LiCH2SiMe3 and Zn/2LiN(SiMe3)2. In addition, a zinc silylamido L1−HZn[N(SiMe3)2] (Zn7) species has been tentatively assigned (obtained via deprotonation of L1 with Zn[N(SiMe3)2]2), that proved inactive for the ROP of ε-CL but displayed good activity for ROP of rac-LA.
研究领域:
有机化学
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高分子化学
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材料科学
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaomin Song,Qi Huang,Bo Jin,Rufang Peng
To improve the encapsulation of GO to CL-20, PEI was utilized as a linker bridge to self-assemble into composite CL-20/PEI/GO in this study. The self-assembly was in-depth characterized, including Zeta potential, SEM, DLS, XPS, Raman spectra, HPLC and power-XRD. The possible self-assembled mechanism was also proposed, which indicates the electrostatic interaction introduced by PEI should be responsible for the self-assembly. The performance of a self-assembled composite was characterized by BAM and DSC analysis. And the results indicate the enhanced interaction promotes GO more efficiently encapsulate CL-20 and improve the safety of the energetic material. Therefore, this work demonstrates a novel and facile method to solve the deprived interaction and corresponding weak desensitization between desensitizer and energetic material.
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高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5113-5123
·
IF 6.569
Runtian Kang,Hang Chen,Ruijie Ji,Haoyang Wang,Takatoshi Seto,Yuhua Wang
It is of great significance for white light-emitting diodes (wLEDs) to explore new, efficient and stable inorganic phosphors excited by wideband near-ultraviolet (n-UV) light. A new type of efficient emission-tunable Ce3+/Mn2+ doped Ca2YHf2Al3O12 (CYHAO) garnet phosphor which can be excited by n-UV light is studied in this work. Due to the effective energy transfer (ET) from Ce3+ to Mn2+ in CYHAO, CYHAO:0.09Ce3+,xMn2+ phosphors have a wide excitation band in the 370–470 nm region with a peak at 410 nm. Under excitation at 410 nm, all the samples show tunable color emission and match with the near UV chip. Through the decay time, it is determined that the energy transfer efficiency is as high as 88.83%. The calculated activation energy is about 0.217 eV, indicating the relatively good thermal stability. The cathodoluminescence (CL) properties show that the phosphor has a high saturation current and saturation voltage. A single component white LED is fabricated by using the CYHAO:0.09Ce3+,0.3Mn2+ phosphor and a 400 nm n-UV chip. It is worth noting that the detailed study of the energy transfer mechanism, thermal quenching mechanism and CL mechanism has reference value for the development of new co-doped phosphors.
研究领域:
材料科学
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光学工程
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高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2026
·
IF 1.3
Xu Saiyuan,Guo Yujun,Wu Yibin,Chen Bin,Xu Yingjie
This study aims to develop and characterize a novel mixed system composed of sodium phenoxide (NaOPh) and a deep eutectic solvent (DES) formed from 1-ethyl-3-methylimidazole chloride ([Emim]Cl) and ethylene glycol (EG), in order to address the phase separation issue commonly encountered in aqueous phenoxide solutions during CO₂ absorption—caused by the generation of phenol. The physicochemical properties, CO 2 absorption performance and absorption mechanism of the NaOPh/DES mixed system were investigated. The results indicate that the density, viscosity, and CO 2 absorption capacity of the studied NaOPh/DES mixed systems increase with NaOPh content. The NaOPh1.0/DES system exhibits the best absorption performance of these systems, with a CO 2 absorption capacity of 2.10 mol‧kg −1 at 313.15 K and 0.1 MPa. DFT calculations reveal that the Na + from NaOPh, the O–H group from EG, and the Cl − from [Emim] Cl can form a stable four-membered ring. This weakens the electrostatic interaction between Na + and [PhO] − , promoting the dissociation of the NaOPh and facilitating the chemical reaction between the “free” [PhO]⁻ and CO 2 to form carbonates. This mechanism is confirmed by FT-IR and 13 C NMR spectra. Using [Emim]Cl–EG DES as a solvent to dissolve NaOPh leverages the reactivity of [PhO] − with CO 2 for efficient absorption, while effectively avoiding phase separation. This expands the application of phenoxide-based systems in CO₂ capture.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Hongyang Zhao,Sihan Fan,Yulong Xiang,Junfeng Li,Yue Li,Xuelu Wang,Xinjuan Liu,Likun Pan
Asymmetric Ni-N-Cl sites are built by NH 4 Cl vaporization. • Ni-N-Cl overcomes the kinetic challenges and delivers excellent CO 2 reduction performance. • XAFS, DFT and CW-ODMR reveal the asymmetric coordination mechanism. • Cl coordination creates electron-rich Ni centers with shifted d-band. • Ni-N-Cl achieves 86.2% CO Faradaic efficiency and enables durable Zn-CO 2 batteries for 53 h operation. Electrocatalytic CO 2 reduction reaction to value-added chemicals represents a promising pathway for sustainable carbon utilization. However, the symmetric coordination environment of conventional M-N 4 single atom sites restricts electronic structure regulation and limits their intrinsic activity. Herein, we develop an asymmetric Ni-N-Cl coordination structure synthesized via high-temperature NH 4 Cl vaporization assisted strategy. This Cl-mediated asymmetric coordination induces a distinct charge redistribution, generates an electron enriched Ni center and an upward shift of the d-band center closer to the Fermi level. These intrinsic modulations significantly facilitate CO 2 activation and proton transfer to the *COOH, thereby lowering the reaction energy barrier. Consequently, the Ni-N-Cl catalyst achieves a CO Faradaic efficiency of 99.67% at -0.7 V vs. RHE in H cell and 17 h long term stability at -100 mA cm -2 in flow cell. Furthermore, this catalyst delivers a peak power density of 1.62 mW cm -2 and a durability of 53 h. This study provides a general methodology for the rational design of asymmetric single atom catalysts through orbital engineering for high-efficiency energy storage technologies. Download: Download high-res image (199KB) Download: Download full-size image
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GREEN CHEMISTRY
·
2026
·
IF 10.6
Yang Li,Guoen Zhang,Chuanshun Feng,Feng Lin,Huan Ye,Wenqi Wei,Qicheng Zhang,Wenchao Peng,Xiaobin Fan
Electrocatalytic conversion of polyethylene terephthalate (PET) plastic waste into formate coupled with hydrogen generation represents a sustainable pathway for plastic upcycling. Herein, a nickel sulfide catalyst (Mo,Cl-Ni3S2) is developed for efficient and stable ethylene glycol (PET monomer) oxidation reaction (EGOR) through a Mo and Cl co-doping strategy. The optimized catalyst Mo,Cl-Ni3S2 possesses a high formate Faradaic efficiency of 94.0% at 1.55 V vs. RHE. Moreover, it maintains 83.3% of its initial activity after 95 hours continuous operation at an industrial current density of 300 mA/cm2. Experiment and theoretical simulations demonstrate Mo and Cl co-doping optimizes the electronic structure of Ni3S2 by upshifting the Ni d-band center and facilitates the in situ structure reconstruction during EGOR. Finally, an integrated acidification-precipitation-recrystallization strategy is proposed to separate and recover terephthalic acid (TPA) and potassium formate. This method offers a holistic approach for upcycling PET waste into value-added chemicals and hydrogen.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Kai Zhang,Peifeng Wang,Zhuohui Sun,Hongwei Zhang,Rui Chang,Youlong Xu
Poor electronic conductivity, low potential plateau, rapid capacity decay, and poor rate capability are critical challenges hindering the development of layered transition metal oxides such as P2-Na0.7MnO2. To address these issues, a high-entropy design combined with Cl substitution has been implemented, resulting in the material P2-Na0.7Li0.02K0.02Mg0.02Fe0.05Cu0.05Ni0.25Ti0.02Nb0.02Mn0.59O1.93Cl0.07. Hall effect tests reveal a transition from hole-dominated to electron-dominated conduction, significantly improving the Na+ transport kinetics, enhancing electronic conductivity, and facilitating the release of a high specific capacity and specific energy. Notably, the bulk carrier concentration increases from 1.63 × 1011 to 2.63 × 1012 cm–3, the surface carrier concentration rises from 2.47 × 1010 to 2.16 × 1011 cm–2, and the mobility improves from 322.7 to 455.9 cm2 (V s)−1. Consequently, the electronic conductivity undergoes a remarkable 20-fold increase from 8.44 × 10–6 to 1.915 × 10–4 S cm–1. The material delivers a reversible capacity of 196.80 mAh g–1 and a specific energy of 587.07 Wh kg–1 at a current rate of 0.05 C.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jingzhen Su,Yong Wang,Cong Li,Zhengming He,Kai Zhang,Mingqiang Ren,Qile Wang,Tianxing Chen,Jibran Ali Ghumro,Virender K. Sharma,Hyunook Kim,Yunshu Zhang
Natural seawater contains abundant halide ions that remain largely untapped, while peracetic acid often requires activation to enhance its oxidative properties. The interaction mechanisms between these components have not been thoroughly investigated. This study investigated the activation effect of high concentrations of Cl − and Br⁻ coexisting in seawater on PAA by adding PAA to seawater. Quenching experiments, along with Electron Paramagnetic Resonance (EPR) spectroscopy and UPLC-TQ-MS, were conducted to determine the reaction mechanism and degradation process of SMX. Seawater systems containing 35 ‰ salinity or Br − -PAA systems (0.5 mM Br − ) degraded 100 % SMX within 10 min or 12 min, respectively ( k obs =0.4873 min⁻ 1 or 0.3581 min⁻ 1 ). While the Cl − -PAA system, though slower, still degraded 97.7 % within 180 min (300 mM Cl − , k obs =0.0173 min⁻ 1 ). SMX degradation rates remained above 95 % across the pH range of 3–9, with optimal performance at pH= 3. However, the presence of HA inhibited SMX degradation efficiency by over 40 %. Results indicate that SMX degradation efficiency correlates positively with Cl⁻/Br⁻ content and PAA concentration. The superior removal efficiency stems from activated PAA not only generating HOCl and HOBr via oxygen atom transfer but also further producing 1 O 2 , which dominates the non-selective degradation process. This approach adapts to a wide pH range but is consumed by coexisting HA. The superiority of the Br − -PAA system over Cl − -PAA stems from the strong oxidizing power of HOBr. The oxidation pathways include halogenation, bond cleavage, and hydroxylation. ECOSAR predictions indicated that most transformation products exhibited higher toxicity than the parent SMX compound.
研究领域:
环境化学
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水处理技术
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氧化过程
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污染物降解
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海洋环境工程
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·
IF 3
Zou Yanyan,Pau Dennis,Yi Linlin,Li Yaoqiang,Li Kaiyuan
13X zeolite–calcium oxide (CaO) composite capture agent application in the pyrolysis recovery of polyvinyl chloride (PVC)-based waste cables was investigated in this research to elucidate the agent’s efficiency in capturing chlorine (Cl) and carbon (C) during pyrolysis. The 13X zeolite–CaO mixture is subjected to separate pyrolysis of the PVC-based cable outer sheath in experimental furnaces of simulated solar-powered and thermogravimetry. Subsequently, a range of spectroscopic techniques are employed to quantitatively analyze the gaseous and solid products resulting from the pyrolysis process. Through X-ray fluorescence, total carbon, and other analyses, the research outcomes demonstrated that the capture agent exhibits superior Cl and C capture performance compared to using a single agent for plastic pyrolysis. The yield of Cl element in the solid residue has increased significantly by 130–140% under the presence of optimized composite capture agent. By determining the dynamic changes of gaseous and solid products during the cable outer sheath pyrolysis, the influence of the capture agent on the redistribution and transformation mechanisms of Cl and C elements was identified, and it was found that contaminating volatiles were well immobilized in the solid residue. This research provides a new solution for efficient Cl and C capture in the pyrolysis recovery of waste cables and determines the fixation and transformation mechanisms of Cl and C elements by the composite capture agent, indicating a potential for feasible and sustainable resource utilization of waste cables.
研究领域:
环境科学
·
材料科学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Wanzheng Ren,Jian Pan,Zhuoqun Li,Min Huang,Lilan Huang,Liqiang Gu,Hailin Cong
The substrate membrane plays a crucial role in determining the performance of composite nanofiltration membranes prepared by interfacial polymerization (IP). In this study, persistent hydrophilic modification of polyvinylidene fluoride-co-chlorotrifluoroethylene (PVDF-CTFE) was achieved by incorporating N-methylglucamine (N-MG) without altering the membrane's morphology or pore size. Moreover, thin-film nanofibrous composite (TFNC) nanofiltration membranes were prepared using the surfactant assembly regulated interfacial polymerization (SARIP) method with the modified PVDF-CTFE@N-MG nanofibrous membrane as the substrate. The effect of N-MG addition on the substrate membrane's hydrophilicity and the structure and performance of the polyamide (PA) separation layer was investigated. The results showed that the addition of N-MG significantly improved the hydrophilicity of the PVDF-CTFE nanofibrous membrane. The TFNC-5 membrane, prepared with the modified PVDF-CTFE@N-MG nanofibrous membrane as the substrate, exhibited permeability exceeding 13.5 L m −2 h −1 ·bar −1 for various dye solutions at 3 bar pressure, with rejection rates above 98 %. It also demonstrated excellent selective separation performance (separation factor for NaCl/Orange G reaching 97.38) and long-term operational stability. This work provides a method for the preparation of low-pressure, high-flux nanofiltration membranes, which is applicable to seawater desalination and dye wastewater treatment .
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Lei Cao,Tongtong Zhu,Minghui Zan,Yulu Liu,Xiaoman Xing,Qing Qian,Qian Mei,Wen-Fei Dong,Li Li
Tea polyphenols (TP), which is accounting for 15–30% of the dry weight of green tea and are widely used in the food industry as antioxidants , preservatives, color preservatives, and flavoring agents . To determine the concentration of TP, a fluorescent method based on nitrogen and chlorine co-doped carbon dots (R-CDs) was investigated. The R-CDs we prepared showed red emission with an absolute quantum yield (QY) of approximately 16.67 ± 0.85%. The limit of detection (LOD) was calculated to be approximately 68 ± 0.94 ng/mL, with an R 2 of 0.999 over the TP range of 1–20 μg/mL. Compared to the ferrous tartrate standard curve method, the concentration of TP in green tea, which was purchased from the market, detected using our method showed an error within 5%, indicating good potential applications in the food industry. Cell imaging experiments suggested that the R-CDs exhibit excellent lysosomal targeting as the Pearson’s correlation coefficient (PCC) in colocalization analysis was found to be 0.91. Further experiments showed that owing to their excitation-independent emission and high QY, the R-CDs could be applied to not only for detecting TP content but also for targeting lysosomes as substitute for commercial dyes.
研究领域:
食品科学
·
细胞生物学
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高影响因子
危险品化学品经营许可证（带存储）