Surfaces and Interfaces
·
2022
·
IF 6.137
Zhiming Jiang,Hongyan Li,Chenxi Zhang,Ping Zhu
Fabric made of polyethylene terephthalate (PET) is a common textile that is widely used in daily life. Its flame retardancy has emerged as a major concern for lowering the risk of fire. As a kind of popular flame retardants , cyclic phosphoramides have been widely applied to improve the flame retardancy of various inflammable materials. To achieve more suitable and effective flame retardants for PET fabric, the fire-safety capabilities of PET fabric coated with various cyclic phosphoramides substituted by siloxane (PDPTP), hydroxyphenyl (DPHBP), and hydroxyethyl (PDNP) groups was explored in this work. All of these chemicals can successfully prevent PET fabric from melting and burning, providing it good flame retardancy and non-dripping performance. LOI values for PET fabrics coated with PDPTP, DPHBP and PDNP increased to 24.6, 25.2, and 30.3% under comparison loadings. These flame-retardant coatings enhanced the char-forming capacity for PET fabric. The residues at 700 °C increased to 26.5 and 27.4% for PDPTP and PDNP coated fabric in N 2 atmosphere compared with 2.9% for pure fabric. Peak heat release rate (PHRR) and total heat release (THR) was effectively restrained by 50% and 35%, respectively. Fortunately, these flame-retardant coatings had no detrimental effects on the mechanical characteristics of PET fabric and even enhanced the weft's tensile breaking forces. Apart from DPHBP significantly reducing the fabric's whiteness, the whiteness of PDPTP and PDNP coated PET fabric hardly changed. The effect of cyclic phosphoramides with various substitutions on the flame retardancy of PET fabric is thoroughly discussed in this paper, which might be useful in the development of more effective flame retardants for PET materials.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2023
·
IF 3.8
Yu Lei,Yibo Tang,Guijun Li,Changguo Chen
Optimizing the microstructure is crucial to design the N-doped carbon-based electrocatalysts towards oxygen reduction reaction (ORR). Herein, a 1D/0D composited catalyst (L-Fe-CN-C) is prepared by using graphitic carbon nitride, iron chloride and carbon black as the raw materials. The resultant catalyst is consisted of N-doped carbon nanotubes and nanoparticles. The nanotubes are dramatically shrunk and smaller carbon nanoparticles are simultaneously generated with the pre-addition of carbon black, both contributing to the large specific surface area, high space utilization and to construct a mesopore-dominated microstructure. Moreover, the content of active pyridinic N is increased in the resultant catalyst. Benefiting from the modulation, the catalyst exhibits an excellent ORR activity with 0.850 V of half wave potential, 6.224 mA cm −2 of limited diffusion current density and high selectivity to 4e-path of ORR in 0.1 M KOH. The zinc-air battery with the catalyst on air electrode outputs a high peak power density, high specific capacity and excellent long-term durability, being comparable to those of the benchmark Pt/C based battery. This work provides a rational strategy to controllably synthesize an N-doped carbon ORR catalyst with hierarchical structure and preferable performance.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Wang Chao,Zhong Weilin,Peng Suqing,Zhang Jingtao,Shu Riyang,Tian Zhipeng,Song Qingbin,Chen Ying
Pickering emulsion offers a promising platform for conducting interfacial reactions between immiscible reagents; it is particularly suitable for hydrogen production by photoreforming of non-water soluble biomass liquid and water. Herein, Pt-promoted (001)-facet-dominated anatase TiO2 nanosheets were synthesized by a hydrothermal route associated with microfluidic technology for high activity and metal dispersion, and selective surface modification was carried out for preparing Janus particles. Photoreforming hydrogen production through n-octanol and water that formed O/W microemulsion with an average diameter of 540 µm was achieved to obtain amphiphilic catalyst. The as-prepared 2D Janus-type catalysts exhibited remarkably stable emulsification performance as well as photocatalytic activity. This finding indicates that triethoxyfluorosilane had negligible impact on the catalytic performance, yet provided a remarkable benefit to large specific surface area at microemulsion interface, thereby enhancing the H2 yield up to 2003 μmol/g. The cyclic experiments indicate that the decrease in cyclic performance was more likely to be caused by the coalescence of the microemulsion rather than the decrease in catalytic activity, and the microemulsion could be easily recovered by simply hand shaking to more than 96% of the initial performance.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Chenyang Shi,Bo Hong,Xueya Zhang,Qian Xiang,Zhian Zhang,Kai Zhang,Jing Fang,Yanqing Lai
Lithium-sulfur batteries are considered to be the most promising high-energy-density storage system, yet the dissolution of polysulfides during the charging process limits the utilization, and cycle stability of active materials, which affects the practical application of lithium-sulfur batteries. Herein, a poly( N -methylaniline) (PMAn) coating film is formed in situ on the cathode surface by electrochemically polymerizing the monomer of N -methylaniline(MAn) contained in the electrolyte during film formation process. The PMAn coating film on the surface of the cathode can prevent the dissolution of polysulfide, then reduce the loss of active material, and slow the oxidation of polysulfide by lithium nitrate , resulting in improved cycle stability. As a result, the lithium-sulfur battery with 0.5 wt% MAn render an initial discharge specific capacity of 1224 mAh/g and a capacity retention of 63.79% for 200 cycles, which is better than the performance of the battery without MAn.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Guoxiang Yang,Haibo Yin,Wenhua Liu,Yuping Yang,Quan Zou,Liulin Luo,Huiping Li,Yuning Huo,Hexing Li
The hybrid Ag/TiO 2 -N photocatalyst was prepared via a supercritical solvothermal process in ethanol fluid. The simultaneous achievement of reduction of Ag + ions and N-doping in silver-ammonia complex solution led to the uniform distribution of Ag nanoparticles stably combined with the surface of TiO 2 -N substrate. As a result, the visible-light photocatalytic inactivation of Acinetobacter baumannii was facilitated via the enhanced visible light harvesting and the high separation efficiency of photo-induced charge carriers. By means of the main active species of O 2 − radical, the synergistic effect of Ag nanoparticles and TiO 2 -N could induce the structure change of bacteria with the leakage of K + ions as well as the mineralization of cell membrane with the elimination of self-repair function, leading to the final cell death. In comparison, the bactericidal activity of Ag nanoparticles and TiO 2 -N under UV light irradiation was due to the intrinsic efficiency and the high light harvesting, respectively. The photothermal effect of Ag nanoparticles in the near-IR light region could be possibly remained by TiO 2 -N substrate to achieve the antibacterial activity. Furthermore, Ag/TiO 2 -N photocatalyst played great bactericidal effect for kinds of bacteria, implying the applicable future to the medical disinfection.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Qingqing Han,Kunjie Zhu,Ting Jin,Zewen Yang,Yuchang Si,Yijing Wang,Lifang Jiao
Sn is considered as a promising anode for lithium-ion batteries due to its low cost and high theoretical capacity (992 mA h g −1 with Li 4.4 Sn). However, the volume expansion (∼300%) during lithiation/delithiation process can result in the continuous pulverization of active materials and exfoliation from current collector, deteriorating the capacity and cycling performance. Here Co/Co 3 SnC 0.7 N-doped carbon nanofibers are successfully synthesized by a feasible electrospinning method. And the materials as the self-standing anode for lithium-ion batteries reveal a high-rate performance as delivering reversible capacities of 480 mA h g −1 at 100 mA g −1 and 290 mA h g −1 at 2000 mA g −1 . In addition, the specific capacity can still maintain 320 mA h g −1 at 500 mA g −1 even after 900 cycles, showing the outstanding cycling stability. The inactive metal Co and one-dimensional N-doped carbon nanofibers synergistically promote the electrochemical performance of the Sn-based anode by inhibiting the aggregation of the nanoparticles and buffering volume variation during lithiation/delithiation process.
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JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Zihao Qiu,Gerile Naren,Rui Meng,Rui Liang,Ziyang Chen
Four Pr-phen-acyl amino acid ternary complexes (Pr [CH 3 (CH 2 ) n CONHCH(CH 3 )COO] 3 ·phenanthroline, n = 4,6,8,10) were synthesized by a method used for optical materials that is based on solution chemical reactions. The molecular structure of the praseodymium complexes was determined using CHN elemental analysis, 13 C-Nuclear Magnetic Resonance ( 13 C NMR) spectroscopy, and Fourier Transform-Infrared (FT-IR) spectroscopy. X-ray diffraction and polarized light microscopy showed that Pr(hex‑ala) 3 ·phen, Pr(oct‑ala) 3 ·phen, and Pr(dec‑ala) 3 ·phen have good crystallinity and exhibit excellent optical anisotropy in the molten state. Ultraviolet-Visible (UV–Vis) spectroscopy revealed that the light absorption of the praseodymium complexes is in the range of 200 nm - 500 nm after the introduction of phenanthroline (phen). Fluorescence spectral analyses in the visible region, at an excitation wavelength of 417 nm, indicated that Pr(hex‑ala) 3 ·phen emits green light. In contrast, the other three praseodymium complexes with long carbon chains emit red light. Furthermore, phen significantly enhances the fluorescence intensity of the complexes and remarkably prolongs their fluorescence lifetimes. Variable-temperature fluorescence spectroscopy revealed that the praseodymium complexes maintained a high luminescence intensity throughout the heating process, ranging from 25 °C to 200 °C, which is attributed to their conjugated functionalities.
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产品关联
DOI
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Sustainable Energy & Fuels
·
2025
·
IF 4.1
Kexiang Li,Fancang Meng,Jiahao Li,Huan Wu,Hongbing Jia,Qingmin Ji
Polypyrrole (PPy) serves as an excellent N-rich precursor for Fe-N-C electrocatalysts, as its pyrrolic-N moieties not only facilitate metal coordination but also generate intrinsic carbon defects, promoting the formation of atomically dispersed active sites. However, excessive interchain cross-linking during polymerization often leads to dense, poorly porous carbon structures upon pyrolysis, severely limiting the accessibility of these active sites and overall catalytic performance. Herein, we report a “dynamic coordination motif” strategy by introducing 4-vinylpyridine (vP) as a co-monomer during the Fe-coordinated pyrrole polymerization. vP may compete with pyrrole for Fe coordination, forming dynamic Fe-vP complexes that act as molecular spacers within the growing polymer network. This process effectively inhibited dense chain packing, creates additional coordination anchors for Fe, and guides the formation of a more open architecture. After pyrolysis, this hybrid polymer transforms into a stable porous carbon matrix with rich pyridinic-N and a high density of accessible Fe-N sites. The resultant vP-Fe@PPy catalysts exhibited significantly superior ORR catalytic performance, outperforming both the vP-free, Fe-doped PPy-derived carbon and the commercial Pt/C catalyst. This work presents a facile and effective strategy for engineering highly accessible active sites in metal-doped carbon electrocatalysts, enabling tailorable metal loadings with uniform distribution.
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高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Yefei Wang,Fei Chang
The development of supported metal hydride catalysts with abundant active sites is a highly desirable yet challenging endeavor in ammonia synthesis. In this work, a lithium hydride (LiH)-loaded Fe/N-co-doped porous carbon (Fe-N-C) composite (LiH/Fe-N-C) was synthesized and demonstrated as an efficient catalyst for ammonia synthesis under mild conditions. The deposition of LiH onto Fe-N-C induced a partial reduction of the Fe-N moiety, resulting in the slight aggregation of isolated Fe single-atom sites into nanoparticles. Under reducing conditions (in the presence of H2), the coordinated nitrogen in Fe-N-C can be removed, forming nitrogen vacancies (VN), while surface iron hydride species (Fe-H) are generated through the interaction between LiH and Fe-N-C. The presence of Fe atoms adjacent to VN facilitates the adsorption and activation of dinitrogen, a process that is further supported by the replenishment of VN under reaction conditions. Notably, no lithium imide or amide species (Li2NH or LiNH2) — typically regarded as key intermediates in LiH-mediated ammonia synthesis, were observed on LiH/Fe-N-C, likely due to the fast hydrogenation step. Consequently, LiH/Fe-N-C achieves an ammonia production rate of 872 mmol·gFe-1·h-1, surpassing the performance of state-of-the-art Fe-based catalysts at 300 oC and 1 MPa. This study demonstrates that the synergistic catalysis of LiH, transition metals, and their adjacent nitrogen vacancies offers a promising pathway for efficient ammonia synthesis under mild conditions.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hao Chen,Xiaofeng Xie,Chaofang Li,Xudong Liu,Fenghua Shen,Pingshan Wang,Kaisong Xiang,Hui Liu
Ionic liquids (ILs) show promise for flue gas purification, but suffer from the insufficient oxidation ability for elemental mercury (Hg 0 ) removal. In light of the critical role of electrophilic structure in the oxidation process, we proposed a novel strategy to enhance Hg 0 oxidative capture by steering electrophilicity of positively charged N center in the cation of IL. We screened ILs containing cations with N centers featuring varied hybridization and localization, and thioacetate anions that aid in immobilizing the resulting mercury ions. The electrophilicity of ILs, as determined by quantum chemical calculations, adheres to the following hierarchy: [Bpy][ThAc] (highly delocalized sp 2 -hybridized N) > [Bmim][ThAc] (low delocalized sp 2 -hybridized N) > [Bpyrr][ThAc] (sp 3 -hybridized N) ≈ [Bpip][ThAc] (sp 3 -hybridized N). This hierarchy correlated positively with experimental oxidation activity and Hg 0 removal performance. Specifically, the Hg 0 adsorption capacity of [Bpy][ThAc] (23.0 mg/g) was 3.6 times larger than that of [Bmim][ThAc]. Hg-TPD, XPS, and theoretical calculations corroborated that the highly delocalized sp 2 -hybridized N with a stable π system in [Bpy][ThAc] constitutes a strong electrophilic center, boosting electron transfer from Hg 0 to the cation. Subsequently, the oxidized Hg 2+ was immobilized through coordination with the anion. Furthermore, beyond the specific mercury removal process, the integration of Hg 0 capture with desulfurization was successfully achieved by introducing [Bpy][ThAc] into the IL employed for desulfurization, highlighting its adaptability and practicability. This work not only develops an effective remediator for Hg 0 removal from the flue gas but also offers design guidelines for ILs used in the oxidative degradation of other contaminants.
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高影响因子
Polymer Chemistry
·
2018
·Vol. 10
·期 5
·619-626
·
IF 4.927
Houbo Zhou,Christopher M. Plummer,Huaan Li,Huahua Huang,Pengfei Ma,Le Li,Lixin Liu,Yongming Chen
Previously, we developed amination modification of polyethylene by metal-free organocatalytic reaction. Here, we applied this chemistry to modify isotactic polypropylene (PP) to investigate the regioselectivity to different carbons. Specifically, this reaction was conducted in tetrachloroethane at 100 °C under a nitrogen protection where C–N bonds were selectively generated from the tertiary C–H bonds of the PP backbone in the presence of N-hydroxyphthalimide (NHPI) and bis(2,2,2-trichloroethyl) azodicarboxylate (BTCEAD). The grafting content of BTCEAD was as high as 4.7 units per 100 propylene units. Thus, a methodology for the regioselective post-functionalization of PP without metal catalysts has been developed. The obtained PP-g-BTCEAD was sequentially used as an atom transfer radical polymerization (ATRP) macro-initiator to graft polymers, such as polystyrene (PS) and poly(methyl) methacrylate (PMMA). The grafting polymerization was unequivocally proved by multiple characterization methods. The graft copolymers were applied as phase compatibilizers to improve blending of PP with PS and PMMA.
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ACS Catalysis
·
2024
·
IF 11.3
Li Jiang,Yiqian Yang,Lin Huang,Yan Zhou,Junwei An,Yuchun Zheng,Yiwei Chen,Yanhong Liu,Jianhui Huang,Ee Lui Ang,Suwen Zhao,Huimin Zhao,Rongzhen Liao,Yifeng Wei,Yan Zhang
The various isomers of hydroxyproline (HP) are widely distributed in nature, serving as key components of structural proteins, while their quaternized betaine derivatives function as osmoprotectants in many organisms. Aerobic bacteria degrade HPs through a variety of well-studied mechanisms. Recent studies show that certain anaerobic bacteria degrade HPs through distinct mechanisms, involving the O2-sensitive glycyl radical enzymes (GREs) t4L-HP dehydratase (HypD) and t4D-HP C–N lyase (HplG). Here, we report the discovery of two more GREs, N-methyl c4L-HP dehydratase (HpyG) and N-methyl c4D-HP dehydratase (HpzG), which catalyze radical-mediated dehydration of the two N-methyl-c4HP enantiomers, while also displaying significant activities toward their unmethylated substrates. Both GREs are associated with homologues of pyrroline-5-carboxylate reductase, which catalyze reduction of their products N-methyl-pyrroline-5-carboxylate to form N-methyl-proline. Crystal structures of HpyG and HpzG in complex with their substrates revealed active site architectures distinct from that of HypD and provided insights into the mechanism of enantioselective radical-mediated dehydration. Our research further expands the repertoire of diverse chemical mechanisms involved in the bacterial metabolism of highly prevalent HP isomers and derivatives in the anaerobic biosphere.
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