COMPOSITES COMMUNICATIONS
·
2026
·
IF 8.6
Tian Fang,Jiujun Zhu,Qixiong Zhang,Xiaopeng Li,Yafei Hou,Renlu Han,Jing Cuan,Weiping Li
Polymer dielectric capacitors are pivotal for advanced electronics, while their limited energy density ( U d ) impedes further miniaturization. Constrcution of nanocomposites to utilizing their both merits seems to improve their U d , however, conventional single-filler systems typically enhance either dielectric constant ( ε r ) or breakdown strength ( E b ), at the expense of the other. Herein,A dual-filler approach is developed to achieve concurrent enhancement of ε r and E b , thereby overcoming the trade-off limitation inherent in single-filler systems. In this study, a series of nanocomposites are designed by incorporating carbon quantum dots (C QDs) into a P(VDF-HFP) matrix with Ni(OH) 2 nanosheets (Ni(OH) 2 NSs). C QDs enhance ε r through the micro-capacitor effect and suppress electron migration via the Coulomb blockade effect. Concurrently, Ni(OH) 2 NSs act as scattering centers and barriers, extending the breakdown path to improve E b . Simulation results confirm synergistic suppression of electrical tree growth. The best nanocomposite obtains a U d of 21.9 J/cm 3 at 570.3 MV/m with charge-discharge efficiency ( η ) of 72.3%. This U d shows a 188% improvement over the single-filler counterpart. Meanwhile, excellent cyclic stability over 10 4 cycles and rapid discharge (τ 0.9 = 117 ns) are also demonstrated. This dual-filler system provides a rational route to concurrently improve ε r and E b for next-generation dielectric capacitors.
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GREEN CHEMISTRY
·
2026
·
IF 9.2
zonghao xu,Zongyu Guan,Yan Song,Xiran Zhao,Yaodong Yuan,Zhipeng Yan,Junhang Tian,Xueyi Sun,Biwei Xiao,Weidong Zhuang
Direct recycling of spent LiFePO₄ (LFP) cathodes is a sustainable and energy-efficient strategy for recovering valuable materials while preserving the intrinsic olivine structure. Herein, we report a LiI-assisted regeneration approach that achieves electronic structure reconstruction and reinforced Fe–O d–p orbital hybridization, enabling simultaneous repair of structural defects and enhancement of Li⁺ transport kinetics. The reductive I⁻ ions promote Fe³⁺→Fe²⁺ conversion and effectively eliminate Fe–Li antisite defects, while Li⁺ replenishment restores the stoichiometry of degraded LFP. Density functional theory (DFT) calculations reveal that LiI triggers a downward shift of the Fe 3d band center and an upward shift of the O 2p band center, narrowing their energy separation and strengthening Fe–O covalency. These electronic modifications reduce Li⁺ migration barriers and reconstruct continuous Li⁺ transport channels, as further validated by ab initio molecular dynamics simulations. In-situ XRD measurements confirm reduced unit-cell volume fluctuations and enhanced FeO₆–PO₄ framework stability, demonstrating improved structural reversibility during cycling. Benefiting from this coupled structural–electronic reconstruction, regenerated LFP delivers 146.9 mAh g⁻¹ at 1 C and retains 97.4% capacity after 500 cycles, outperforming the spent material. This work proposes a green and low-energy direct regeneration route for cathode materials and provides important theoretical guidance for their efficient repair and regeneration.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Zhiheng Wu,Gongkai Zhang,Xuantong Zuo,Hao Ba,Yuran Yu,Yonglong Shen,Guosheng Shao
Metal-free graphene-based electrochemical catalysts are regarded as promising alternatives to precious-metal catalysts for catalyzing both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in rechargeable aqueous Zinc–air batteries. Doping is the most common method for metal-free catalysts to tune their electronic properties and surficial structures, albeit having achieved yet inadequate catalytic activity and stability. Herein, we have formulated an architecture to construct nano-heterojunctions between few-layer phosphorene (P_ene) and the N and P co-doped vertical graphene (NPVG) films, thus enhancing interfacial interaction to stabilize P_ene and achieving remarkable catalytic activities for both ORR and OER with the islands of NPVG/P_ene nano-heterojunctions tuning surficial valence electron distribution in NPVG to significantly lower OER barrier without compromising ORR barrier. Ultimately, the NPVG/P_ene based Zn–air battery exhibited exceptionally high peak power density of 246.4 mW cm −2 plus outstanding cycling stability over 500 h at the charge-discharge current density of 10 mA cm −2 , which drastically outperform the benchmark catalyst (Pt/C and RuO 2 ) based battery cells for three times of peak power density and eleven times of cycling stability. This work provides an attractive and sustainable route with nano-heterojunctions peppering on co-doped graphene as effective bifunctional ORR-OER catalysts essential to resilient Zn-air batteries and alkali fuel cells.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qingshan Zhao,Xiaojie Tan,Tengfei Liu,Shuai Hou,Wanxin Ni,Hao Huang,Jinqiang Zhang,Zhongxue Yang,Dawei Li,Han Hu,Mingbo Wu
Heteroatom-doped carbon materials have been regarded as sustainable alternatives to the noble-metal catalysts for oxygen reduction reaction (ORR), while the catalytic performances still remain unsatisfactory. Herein, we develop a metal-free adjacent N, P and S-codoped hierarchical porous carbon nanoshells (NPS-HPCNs) through a novel layer-by-layer template coating method. The NPS-HPCNs is rationally fabricated by crosslinking of polyethyenemine (PEI) and phytic acid (PA) on nano-SiO 2 template surface and subsequently coating of viscous sulfur-bearing petroleum pitch, followed by pyrolysis and alkaline etching. Soft X-ray absorption near-edge spectroscopy (XANES) analysis and density functional theory (DFT) calculations prove the engineering of adjacent N, P and S atoms to generate synergistic and reinforced active sites for oxygen electrocatalysis. The NPS-HPCNs manifests excellent ORR activity with a half-wave potential (E 1/2 ) of 0.86 V, as well as promoted durability and methanol tolerance in alkaline medium. Remarkably, the NPS-HPCNs-based Zn-air battery delivers an open-circuit voltage of 1.479 V, a considerable peak power density of 206 mW cm −2 and robust cycling stability (over 200 h), even exceeding the commercial Pt/C catalyst. This study offers fundamental insights into the construction and synergistic mechanism of adjacent heteroatoms on carbon substrate, providing advanced metal-free electrocatalysts for Zn-air batteries and other energy conversion and storage devices.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
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IF 14.224
Chengyu Zhang,Zhisheng Yu,Xiangyang Wang,Bobo Wang
In this study, a novel γ-Fe 2 O 3 /biochar (BF γ ) composite by a plant in-situ enrichment and one-step pyrolysis strategy was prepared, which was applied as a photocatalyst to activate peroxymonosulfate (PMS) for the degradation of p-chlorophenol (4-CP) under visible light irradiation (BF γ /PMS/Vis) system. The characterization results exhibited that γ-Fe 2 O 3 with localized carbon doping was evenly embedded in biochar during the pyrolysis. BF γ exhibited better photoresponse properties than biochar (BC) and γ-Fe 2 O 3 . The removal efficiency of this system for 4-CP reached 96.41% under optimal conditions. This system showed high removal efficiency with a wide pH range (3.0–13.0) and under conditions of different organic pollutants . It also showed strong resistance to interference with co-existing inorganic ions and humic acid (HA). Electron paramagnetic resonance (EPR) and radical scavenging experiments revealed that the reactive oxygen species (ROS) in this system included SO 4 - ·, ·OH, ·O 2 - and 1 O 2 . The density functional theoretical (DFT) calculations further revealed the promotion of localized carbon doping in γ-Fe 2 O 3 on electron transfer and photoresponse, including C-O bond (d=1.29 Å), C-Fe bond (d=1.80 Å) and band gap value (E gap < 0.72 eV). This study provides new insights into constructing environmentally-friendly catalysts and the possibility of the solid waste recycling for other wetland plants.
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REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Chentao Liu,Huajun Duan,Huijuan Zhao,Yuan Gao,Juan Zhang,Jin Kang,Huiru Ma
The demand for flame retardancy in epoxy thermosetting resins (EP) has become increasingly urgent, but the mechanical properties should not be damaged while ensuring flame-retardancy efficiency. To achieve this, a heterocyclic compound (BDP) containing reactive functional groups was successfully synthesized by 2,4-Diamino-6-phenyl-1,3,5-triazine (DPT), paraformaldehyde and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) in a one-pot process. From the analysis of the curing behavior, the addition of BDP facilitated the curing reaction of EP by reducing the apparent activation energy (E c ). Dynamic mechanical analysis (DMA) and flexural tests indicated an increase in the glass transition temperature (T g ) and flexural strength of the flame-retardant epoxy resin (FREP) increased by 5.2% and 8.9% respectively, caused by an enhancement of intermolecular forces . As well, a V-0 classification in vertical combustion with a limiting oxygen index (LOI) of 35.2% was attained at a phosphorus content of merely 0.48 wt%. Cone calorimetric (CC) test demonstrated that total smoke production (TSP) and the peak heat release rate (PHRR) of EP-7.5/BDP were reduced by approximately 19.2% and 29.4% respectively in comparison to EP. This positive smoke inhibition and flame retardancy were caused by the blocking and dilution effect presented by the FREP during combustion.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Zhengxian Wang,Jiankang Lu,Chengyi Wu,Youmeng Dan,Guoxiang Li,Deyong Wu,Sheng Hu
Poly(N-isopropyl acrylamide) and its derived copolymer, as a temperature-responsive material, are widely used in the field of anticancer drug carrier. And it also plays an important role as carrier in slow-release fertilizer in recent years. In this paper, a smart poly(N-isopropyl acrylamide- co -acrylamide)-coated Alg-BMOF (PABMOF) was fabricated in ionic liquids microemulsion ([Bmim]PF 6 /TX-100/water) as nano-reactor. The structure and morphology of PABMOF were characterized by FT-IR, XRD, XPS, SEM, TG and BET. The resultant PABMOF was used as a adsorbent for H 2 PO 4 − adsorption. The adsorption kinetics , isotherms and mechanism of H 2 PO 4 − onto the resultant PABMOF were studied. The adsorption kinetic data was well suitable for pseudo-second-order kinetic model, and adsorption isotherm results demonstrated that the equilibrium data was fitted for Freundlich model. The water-holding and water-retention capacity of soil with TRSRFs addition of 2 wt% were74.3% and 52.13% at 30th day, respectively. Moreover, the release behavior of TRSRFs in water show that the cumulative release rate (C r %) were 81.4% at 45 °C and 97.6% at 25 °C within 172 h, which displayed the excellent temperature-responsive property. The effect of TRSRFs on the growth of Chinese cabbage was investigated, which was indexed with the germination rate, plant height and root length of the crop.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Xuebo Liu,Fangyuan He,Liwei Bai,Xiaowei Cao,Chang Liu,Wenbo Lu
Hydroquinone (HQ) and catechol (CC) are important chemical raw materials in the modern industry, unfortunately, which are also high toxic phenolic pollutants. So how to achieve highly sensitive and selective determination HQ and CC is the challenge we face. In the present work, we report a facile strategy to obtain nitrogen and phosphorous co-doped glucose-derived carbon coated CoP nanowires (G-CoP/N,P–C NWs), in which nitrilotriacetic acid (NTA) was as the chelating reagent, glucose was as carbon source, and the precursors were subsequently experienced carbonization and phosphorization process. G-CoP/N,P–C NWs can shorten the distance of the electron transport and expand the reaction area, showing the intriguing electronic conductivity and electrocatalytic abilities. An electrochemical phenolic sensor based on G-CoP/N,P–C NWs is fabricated. The as-prepared sensor showcases the good sensing performance for HQ and CC with comparative linearity ranges of 0.8–900 μM (HQ) and 0.6–800 μM (CC), low limits of detections (LODs) of 0.18 μM (S/N = 3) and 0.12 μM (S/N = 3) for HQ and CC, respectively. Notably, it also displays excellent practical application for the recognition of HQ and CC in the rain water, the tap water , the domestic wastewater and the lake water, which may be a promising candidate in environmental water monitoring and drinking water safety.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Yijie Zhang,Leran Liu,Jinwei Wang,Rui Yao,Yun Wu,Muheng Wang,Qiang Zhao,Jinping Li,Guang Liu
Rational design and construction of electrocatalysts that can work well at large current densities are imperative for water splitting. Herein, a multi-stage P–Ni 3 S 2 /NiFe/NF electrocatalyst was rationally designed by introducing heteroatoms (S and P) and heterostructure construction. Benefitting from the optimized electronic structure configuration by the synergistic incorporation of S and P, the as-prepared P–Ni 3 S 2 /NiFe/NF electrocatalyst exhibits remarkable activity and stability towards oxygen evolution reaction (OER) in alkaline media , yielding ultralow overpotentials of 250 mV and 372 mV at the current densities of 100 mA/cm 2 and 1000 mA/cm 2 , respectively. Moreover, its multi-stage heterostructure also endows the electrocatalyst with unique multifunctional properties, making it can realize overall water splitting under a low cell voltage of 1.57 V at 10 mA/cm 2 , and has long-term stability. This work demonstrates the importance of rational introduction of heteroatoms and interface/surface engineering for advanced electrocatalytic materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Dongfeng Sun,Songmin Lin,Yuan Yu,Shengwei Liu,Fangyou Meng,Gaohui Du,Bingshe Xu
Transition metal phosphides are novel electrocatalysts that can be used to replace noble metals for the electrochemical production of hydrogen. In this work, N and P co-doped carbon-coated cobalt-doped molybdenum phosphide (CoMoP@N,P-C) nanoparticles are explored as electrocatalyst for overall water splitting. The presence of a unique three-dimensional (3D) porous structure in CoMoP@N,P-C offers abundant catalytic active sites for the penetration of the electrolyte solution, thereby facilitating the transfer of ions. In addition, cobalt doped into MoP increases the catalytic activity, and N and P co-doped carbon improves the electrical conductivity of the carbon matrix. Subsequently, the synergy between CoMoP cores and N, P-C shells enhances the total hydrolysis performance of the electrocatalyst in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) processes. At a current density of 10 mA/cm 2 in 1 M KOH, HER and OER overpotential of the CoMoP@N, P-C are 152 mV and 296 mV, respectively. Moreover, the cell voltage of CoMoP@N, P-C as a bifunctional electrode for overall water splitting is 1.62 V (at 10 mA/cm 2 ), which is close to that of the full noble-metal electrode (RuO 2 || Pt/C, 1.58 V). Overall, the CoMoP@N, P-C bifunctional catalyst shows great potential for replacing noble-metal electrodes in water splitting applications.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 47
·22335-22343
·
IF 3.591
Siqi Wei,Haoyi Li,Xinghang Yin,Qiang Yang,Anli Chen,Renjie Li,Jing Wang,Rui Yang
Synthesizing high-efficiency red carbon dots (R-CDs) and exploring their photoluminescence mechanism remain challenges as well as critical issues hindering the development of red room-temperature phosphorescence (RTP) materials of CDs. Herein, a series of highly efficient R-CDs are prepared from citric acid and formamide by solvothermal method on account of the protective and destructive effects of solvents. The larger sp2 conjugated domains of the carbon core and the high content of graphitic N are identified as the key factors for R-CDs to exhibit red fluorescence. Surface groups also contribute to red emission by means of the formation of the N, O-related defect state. By establishing N-doping models and using DFT calculation, it is further demonstrated that the strong p–π conjugation effect caused by the non-bonding electrons of graphitic N would facilitate HOMO–LUMO splitting of the carbon core, thus leading to a significant decrease in the HOMO–LUMO gap. Energy level splitting could lead to a certain degree of energy level crossing, which could contribute to effective intersystem crossing and produce red RTP. From this, the potential applications of R-CDs in the information encryption field are proposed and demonstrated.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 24
·5270-5276
·
IF 6.569
Shiwei Liu,Jiale Chen,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
The dimensional reduction theory is applied to an A2O–P2O5–Bi2O3 system where P2O5 serves as a binary parent while A2O and Bi2O3 are regarded as dimensional reduction agents. Thus, three novel phosphates ACs5Bi4(PO4)2(P2O7)3 (A = K, Rb and Cs) have been prepared through the high-temperature solution method. Single-crystal X-ray diffraction measurements reveal that they all crystallize in the monoclinic space group P21/c (no. 14) and in their structures, two different kinds of P–O units, i.e. isolated PO4 tetrahedra and P2O7 dimers, are interconnected by Bi–O groups to construct a 3∞[Bi4(PO4)2(P2O7)36−] framework. Note that with the change of cationic size in their structures, the Bi3+ cations also exhibit flexible coordination, i.e. BiO5 and BiO6 polyhedra in KCs5Bi4(PO4)2(P2O7)3 and only BiO6 polyhedra in Cs6Bi4(PO4)2(P2O7)3, suggesting that combining the flexible coordination of Bi3+ cations with phosphates based on dimensional reduction theory is an effective strategy to guide the synthesis of new compounds.
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