INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2025
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IF 4.6
Xiao-Hui Yang,Guo-Hua Zhang
Fully dense and fine-grained W 2 B 5 ceramics were successfully fabricated by spark plasma sintering at 1375 °C using metallic cobalt as additive. Co reacted with W 2 B 5 to form binary (CoB) and ternary phases (W 3 CoB 3 ) during sintering process. Experimental results showed that the relative density of W 2 B 5 ceramic increased from 96.7 % (for pure W 2 B 5 ceramic sintered at 1800 °C) to 99.0 % with 10 wt% Co addition and 99.5 % with 20 wt% Co addition (sintered at 1375 °C), respectively. Due to the lower sintering temperature, the grain size of W 2 B 5 in W 2 B 5 -10Co decreased from 5.3 ± 0.2 μm to 3.2 ± 0.1 μm relative to pure W 2 B 5 . However, in the case of 20 wt% Co addition, W 2 B 5 grains grew anisotropically, forming elongated strips with a length of 4.2 ± 0.3 μm and a width of 1.1 ± 0.2 μm. The W 2 B 5 -10Co composite exhibited superior mechanical properties with the Vickers hardness of 19.7 ± 0.3 GPa (30 Kg), fracture toughness of 8.7 ± 0.4 MPa·m 1/2 and flexural strength of 783.2 ± 22 MPa. Compared to pure W 2 B 5 ceramics, the hardness remained almost unchanged, while the fracture toughness and flexural strength were significantly improved by 61.8 % and 49.8 %, respectively. These improvements benefitted from the combination of high densification degree, fine-grained strengthening and in-situ CoB phase formation improving interfacial adhesion via semi-coherent interfaces. However, excessive addition of Co (20 wt%) induced stress concentration via brittle CoB coalescence, outweighing the densification benefit and drastically reducing hardness and flexural strength.
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JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 6
·1-9
·
IF 2.8
Tian Erlin,Qin Xiaofan,Yan Fufeng,Chen Jing,Dai Haiyang,Xue Renzhong,Zhang Tingting,Li Tao
In this study, five co-polyimide (co-PI) films were synthesized through copolymerization using 6FDA and PMDA as dianhydride monomers paired with ODA diamine. By systematically varying the 6FDA/PMDA molar ratio, we successfully regulated the microstructural characteristics of co-PI films, particularly their free volume and molecular chain rigidity. The structure–property relationships were comprehensively investigated using positron annihilation lifetime spectroscopy (PALS), with special emphasis on thermal, dielectric, and mechanical performance. Notably, the glass transition temperature (Tg) exhibited a progressive decrease from 384.9 ℃ for PI-1 to 307.8 ℃ for PI-5. This thermal behavior is related to the increase of free volume and the decrease of molecular chain rigidity caused by higher 6FDA content. Correspondingly, the dielectric constant ( k ) at 10 4 Hz decreased from 3.55 to 2.46 across the series, demonstrating that enhanced free volume effectively reduces dielectric polarization. However, this microstructural modification came at the expense of mechanical integrity, as evidenced by the descending tensile strength trend with increasing 6FDA proportion. These findings demonstrate an effective strategy for developing high-performance polyimide films combining low dielectric constant with balanced thermal and mechanical properties.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 48
·25378-25384
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IF 8.867
Tanyuan Wang,Chao Wang,Yue Jin,Anna Sviripa,Jiashun Liang,Jiantao Han,Yunhui Huang,Qing Li,Gang Wu
Transition metal phosphides are often studied as hydrogen evolution reaction cathode catalysts, but scarcely as oxygen evolution reaction (OER) anode catalysts for water oxidation. Herein, we report a new amorphous Co0.63Fe0.21P0.16 OER catalyst, which was prepared through a one-step solvothermal process. This catalyst exhibits extraordinary OER catalytic activity in alkaline media and is superior to the state of the art IrO2 in 1.0 M KOH, capable of yielding a current density of 10 mA cm−2 at an overpotential of only 217 mV. This newly achieved high activity outperforms most reported transition metal phosphide catalysts. During the OER, the surface layers of the Co0.63Fe0.21P0.16 nanospheres (200–500 nm) are oxidized, which show the typical Tafel slope of oxides around 40 mV dec−1. The in situ formation of surface Co oxides in the catalysts during the OER along with an optimal doping of Fe are found to be crucial for their remarkable activity. In particular, the metal-rich amorphous phosphide cores, i.e., substrates, probably contribute to OER performance of the catalysts due to their high electrical conductivity. This new type of surface oxidized amorphous transition metal phosphide would provide a new pathway for the design of high-performance OER electrocatalysts.
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CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Shanglin Li,Leiyi Zhang,Yulun Wu,Jiale Guo,Chengbo Yang,Kun Chen,Yajuan Li,Longjiang Tian,Jingbo Liu,Ting Zhang,Zhiyang Du
With the increasing demand for the co-encapsulation and controlled delivery of bioactive compounds, the design of liquid-based carriers has garnered considerable attention. Vitamin D 3 and riboflavin sodium phosphate (RP) suffer from poor stability and low bioavailability; nevertheless, high internal phase Pickering emulsions (HIPPEs) feature a tunable microstructure that allows for effective compartmentalization of multiple components. In this study, HIPPEs stabilized by egg white peptide (EWP)-konjac glucomannan (KGM) co-assemblies were constructed as a versatile vehicle for the co-delivery of vitamin D 3 and RP. EWP-KGM co-assemblies were comprehensively characterized using multispectral techniques and structural analyses. The EWP@KGM co-assembly (mass ratio 10:5) exhibited enhanced emulsifying activity index (EAI: 15.12 m 2 /g, 3.74-fold higher than EWP) and emulsifying stability index (ESI: 736.60 min, 53-fold higher than EWP), attributed to increased interfacial thickness and steric hindrance. All HIPPEs demonstrated shear-thinning behavior, gel-like viscoelasticity (G′ > G″), and long-term storage stability. Under simulated gastrointestinal digestion, EWP-KGM-HIPPEs protected RP integrity and improved vitamin D 3 bioaccessibility. FFA release kinetics followed Korsmeyer-Peppas model, indicating anomalous transport driven by diffusion and matrix relaxation. This study presents a promising platform for the dual encapsulation of bioactives with contrasting polarities, paving the way for applications in nutraceuticals.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Sixian Hou,Yi Wang,Weiming Zhang,Shan Li,Yongxin Tao,Qiangshan Fu
Antibacterial poly[(acryloyloxyethyl trimethyl ammonium chloride)-co-(hydroxyethyl methacrylate)-co-(methyl methacrylate)] (P(DAC-HEMA-MMA)) was designed and synthesized via aqueous copolymerization using DAC, HEMA, and MMA as cationic, functional, and hydrophobic monomer, respectively. The structure, thermal property and elemental composition of the copolymer were characterized by multiple techniques. Antibacterial performance test showed that minimum inhibitory concentrations (MIC) of P(DAC-HEMA-MMA) against both Escherichia coli and Staphylococcus aureus were 3.12 mg/mL. When P(DAC-HEMA-MMA) was applied to the aged paper sample, its tensile strength, folding endurance, and tearing resistance were increased by 88.4%, 118.7%, and 60.5%, respectively, with a whiteness improvement of 21.5%. After dry-heat aging, it still remained excellent anti-aging ability. In addition, the antibacterial rates of the treated paper sample against E. coli and S. aureus reached 69.2% and 97.7%, respectively, and the treated one maintains unchangeable antibacterial performance after exposing to the ambient condition for 3 months; the water contact angle reached 118.9°, higher than that of the original paper sample, and however, it was decreased over time. All the results confirmed P(DAC-HEMA-MMA) treatment can effectively enhance the mechanical properties of the paper samples, and endow them with wonderful antibacterial and hydrophobic properties, thus holding multifunctional application in the field of paper postprocessing.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Yanni Liu,Dong Shen,Jun Liu,Yuqiong Zhao,Guojie Zhang
Dry reforming of methane (DRM) is a promising route for the simultaneous utilization of CH 4 and CO 2 to produce syngas, yet the development of efficient and stable catalysts for low-temperature DRM remains highly challenging. In this work, a series of Co/CeO 2 catalysts with morphology-controlled ceria supports were prepared to investigate the structure–performance relationship in DRM. Among them, the catalyst supported on CeO 2 nanorods (Co/CeO 2 -R) exhibited the best catalytic activity and stability at 600 °C. Structural characterization suggests that the CeO 2 -R support provides a higher surface area and defect density, which favors Co dispersion and the formation of Co-O-Ce interfacial structures. Raman, XPS, and H 2 -TPR results indicate that Co/CeO 2 -R possesses a higher concentration of oxygen vacancies and stronger interfacial interactions compared with other catalysts. CO 2 -TPD measurements further show enhanced CO 2 adsorption capacity, which is consistent with the increased density of defect sites. The results collectively suggest that the improved catalytic performance originates from the synergistic effect of Co dispersion, oxygen vacancies, and Co-O-Ce interfacial structures, which together promote CO 2 activation, oxygen transfer, and carbon removal. In situ DRIFTS results suggest a bifunctional reaction pathway, in which CH 4 activation is likely to occur on Co sites, while CO 2 is activated on defect-rich CeO 2 surfaces to form carbonate/formate species that may participate in carbon removal. Overall, this work establishes a structure-performance correlation between CeO 2 morphology and catalytic behavior, providing insights into the design of Co-based catalysts for low-temperature DRM.
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高影响因子
IONICS
·
2026
·
IF 3.4
Zhao Yang,Zhang Wang,Jia Qingbo,Wu Can,Wang Ding,Duan Jianguo,Zhang Yingjie
P2-type cathode materials with good rate performance show significant potential for sodium-ion batteries (SIBs), but their low theoretical capacity limits further development. Here, the Na₀.₇₂Cu₀.₂₁Mn₀.₆₇Li₀.₀₆Ti₀.₀₆O₂ cathode layered material is elaborately designed, and the oxygen redox reaction of the oxygen anions gradually shifts from O²⁻ to O₂⁻ via the synergistic modulation of Li⁺ and Ti⁴⁺, especially at a higher voltage, achieving high-capacity Co/Ni-free SIBs. Notably, the NCMLT electrode delivers a capacity of 127.1 mAh·g⁻¹ after 200 cycles at the 1 C, and attains an outstanding capacity retention of 89.86%. Additionally, the metal oxide cost of the synthesized material is relatively low. Thus, this work provides a new approach to design the cathode for high-performance SIBs and offers a value for further development.
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高影响因子
FUEL
·
2026
·
IF 7.8
Yongyi Zhang,Yupeng Lu,Lu Wang,Jiaqian Sun,Jinping Wang,Rui Yang,Chunling Zuo,Xiaoshuang Chen
To tackle the conversion and storage of extra renewable electricity and satisfy the ceaselessly expanding worldwide energy need, the craft of affordable and steady bifunctional electrocatalysts stands as vital. In this work, a FeCr co-doped Co(PO 3 ) 2 /NiCoP (FC-CPO/NCP) heterojunction electrocatalyst with self-supported 3D fibrous root system-like structure is successfully fabricated on nickel foam via a classic two-step hydrothermal-phosphatization approach. This fibrous root system-like nanostructure offers abundant porous channels and exposed active sites, which efficiently accelerate the electrolyte transport and enable the smooth proceeding of electrocatalytic reactions. Meanwhile, benefiting from its intrinsic interfacial composition and synergistic effect of dual metal doping, the FC-CPO/NCP catalyst facilitates the rapid electron transfer, optimizes the electronic structure and elevates the catalytic activity. Electrochemical characterizations verify that the as-prepared catalyst delivers appropriate bifunctional activities, showing the overpotentials of 225 mV for OER and 55 mV for HER at 10 mA cm −2 in alkaline electrolyte. When assembled as both electrodes into an electrolyzer for overall water splitting, the system achieves a current density of 10mA cm −2 at the cell voltage of 1.50 V and maintains robust stability over 72 h of continuous operation. This work provides an efficient and economical strategy for the rational design of high-performance electrocatalysts, thereby advancing the progress of sustainable energy conversion devices.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2026
·
IF 6.9
Bing Bao,Rui Zhao,Yuhan Cheng,Manli Sun,Hong Li,Wei Ding,Huaili Zheng
Background Excess phosphorus in aquatic environments causes eutrophication. Low-valence inorganic and dissolved organic phosphorus are harder to remove than orthophosphate. These species usually require oxidation before separation, whereas oxidation alone cannot reduce total phosphorus (TP), resulting in multi-stage treatment processes. Methods This study explores a waste-derived cerium-modified CoFe 2 O 4 @biochar composite (ECB) prepared from crab shells for synchronous oxidation and adsorption of phosphorus species in water. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), were conducted for material characterization. Electron spin resonance (ESR) and radical quenching tests were used to identify reactive oxygen species. Significant findings The ECB/peroxymonosulfate (PMS) system removed 95.6% of P(III) within 30 min at neutral pH, reducing residual TP below 0.5 mg/L. PMS addition accelerated phosphorus removal by oxidizing P(III) to phosphate, which was captured by surface cerium-containing sites. The adsorption followed pseudo-first-order kinetics. Mechanistic results showed CoFe 2 O 4 @biochar activated PMS to generate SO 4 •− as the main reactive species, and electrostatic interaction and ligand exchange were responsible for phosphate capture. The ECB/PMS system was effective for dissolved organic phosphonates and exhibited magnetic separability, reusability, and low metal leaching. This research presents an efficient one-step strategy for phosphorus control and recovery, supporting cleaner production and circular utilization of crab shell waste.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yunpeng Liu,Xupo Liu,Cuicui Zhang,Ye Chen,Zhitao Wang,Gangya Wei,Jing Zhang,Tianfang Yang,Fengxian Zhang,Shuyan Gao
Fe-N-C catalysts have served as ideal catalysts for oxygen reduction reaction (ORR), but the strong adsorption to ORR-relevant intermediates and less utilization of Fe-N x sites endow those catalysts with inferior performance. Here, an efficient catalyst consisted of Fe-N x species and FeF 2 /Fe 3 C nanoparticles co-anchored on N, F co-doped carbon nanotubes (Fe-NF-CNTs) has been constructed through a surface modification strategy. Sodium trifluoroacetate as functional linker modified on metal-organic framework surface promotes to form abundant and accessible active sites. FeF 2 /Fe 3 C nanoparticles and hydrogen fluoride generated in pyrolysis process facilitate to construct N, F co-doped CNTs with defects and holes. N, F co-doping modifies the adsorption characteristic of Fe-N x sites, while CNTs improve the accessibility of active sites and the capability of material transport. Therefore, Fe-NF-CNTs exhibits outstanding activity (E 1/2 = 0.85 V) and stabilization (ΔE = 6 mV, 10k cycles). Impressively, Fe-NF-CNTs delivers high power density (144 and 68 mW cm –2 ) and cycle stability (300 and 60 h) in liquid and flexible Zn-air batteries, respectively. This work provides a surface modification strategy to guide the tuning of electronic structure of efficient ORR catalysts designed for renewable green energy.
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高影响因子
FUEL
·
2022
·
IF 8.035
Jun Liu,Yu Zhang,Zhoujie Liang,Guojie Zhang,Ying Wang,Yuqing Zhao,Guoqiang Li,Yongkang Lv
In this paper, a series of bimetallic catalysts with different Ni/Co ratios were prepared by co-impregnation method for application in methane dry reforming reaction. The effects of different Ni/Co ratios on the catalyst performance were investigated. The catalysts were characterized by XRD, BET, H 2 -TPR, TG, TEM and FTIR. The results showed that after the introduction of a certain amount of Co, the synergistic effect between Ni and Co enhanced the active component-carrier interaction, thus improving the dispersion of the active component of the catalyst, reducing the particle size of the metal, and increasing the activity of the catalyst. Meanwhile, the mechanistic study showed that the introduction of Co species with strong oxygen affinity facilitated the formation of oxygen vacancies. It makes the catalysts contain higher lattice oxygen and carbonate species, which was conducive to the elimination of carbon accumulation, thus improving the stability of catalysts. Therefore, the 10Ni-8Co-10Y/WC-AC catalyst exhibited excellent dry reforming of methane (DRM) performance at a Ni/Co ratio of 5:4. The conversions of CO 2 and CH 4 were 95 % and 88 % at 800 °C under atmospheric pressure, respectively.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Xinyao Zou,Chao Ma,Ang Li,Zhan Gao,Zulipiya Shadike,Kun Jiang,Junliang Zhang,Zhen Huang,Lei Zhu
Electrochemical conversion of CO2 to the syngas hybrid with the Fischer–Tropsch (FT) process is a promising way to produce synthetic fuels from renewable energy sources. The product distribution in liquid hydrocarbons produced by FT synthesis has strong dependence on the CO/H2 ratio of the syngas feedstock. Herein, we demonstrated the feasibility of tuning the CO/H2 ratio at a wide range by developing nanoparticle-assisted Ni–Co binary single-atom catalysts for electrocatalytic production of syngas. By controlling the elemental proportion of Ni–Co in the composite catalysts, electrochemical reduction of CO2 to syngas with a tunable CO/H2 ratio from 0.3 to 27.6 was achieved. For the binary catalysts with a Ni–Co ratio of 1:1, the CO/H2 ratio maintains at 1.3–1.5 in a broad potential range from −0.59 to −0.83 V versus reversible hydrogen electrode (RHE) and the total current density reaches ∼32.2 mA/cm2 at −1.0 V versus RHE. The promotion effect of nanoparticles on Ni–Co single-atom catalysts was validated by partial removal of nanoparticles and further density functional theory (DFT) calculations. As revealed by DFT calculations, nanoparticles incorporated in single-atom sites take essential roles in facilitating the adsorption of CO2 and the formation of *COOH. The origin of CO2RR and hydrogen evolution reaction reactivities can be identified as Ni–N4 and Co–N4 single-atom sites, respectively. The dual active sites allow the facile control of the CO/H2 ratio of electrochemical converted syngas, and it will be beneficial to downstream production of diverse chemicals.
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高影响因子
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