JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jinfeng Li,Yuxuan Li,Yang Liu,Yuan Shao,Wuyang Song,Youjun Lu
： High-entropy nitride ceramics (HENCs) require high sintering temperatures,and exhibit relatively low density and insufficient fracture toughness, greatly restricting their applicability in structural load-bearing scenarios under extreme service environments. To address these limitations, this study employed Fe as a sintering aid and prepared (Hf 0.2 Zr 0.2 Ti 0.2 Nb 0.2 Ta 0.2 )N-Fe composite ceramics with 0–20 wt% Fe via spark plasma sintering (SPS) in the temperature range of 1600–2100 ℃. We evaluated how Fe content and sintering temperature jointly affect microstructure and mechanical properties. The results show that pure HEN ceramics densifies only at 2100 °C, reaching 96.41% relative density, due to sluggish diffusion and lattice distortion. Although high temperature enhances diffusion, it also coarsens the grains to 5.40 ± 2.18 μm. In contrast, adding only 5 wt% Fe enables densification at a reduced temperature of 1700 °C, achieving 98.81% relative density and refining the grain size to 3.25 ± 1.01 μm. Regarding mechanical properties, pure HEN ceramics exhibits a hardness of 19.79 ± 0.49 GPa and a fracture toughness of 3.86 ± 0.32 MPa·m 1/2 . When 5 wt% Fe is added, both mechanical indices increase markedly, with hardness increasing to 21.09 ± 0.35 GPa and fracture toughness to 4.38 ± 0.31 MPa·m 1/2 . These results demonstrate a pronounced synergistic effect of Fe addition and reduced sintering temperature on the microstructure of HEN ceramics. During sintering, by forming Fe-rich interfacial phases, Fe accelerates low-temperature densification, while its segregation at grain boundaries and triple junctions regulates boundary migration, enabling fine grains and high density at reduced sintering temperatures.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Yating Jiang,Xinrui Chen,Xuanyu Chen,Weibin Zhang,Syed Awais Ahmad,Xiankui Lv
Solar-driven CO 2 reduction is often limited by slow surface reactions and large thermodynamic barriers. In this work, we activated the hidden reactivity of molybdenum disilicide (MoSi 2 ) through controlled nitrogen (N) doping. Instead of simple physical mixing, nitrogen incorporation triggers a clear rearrangement of the crystal structure, leading to the preferred exposure of the active (110) facets and an improvement in the porous framework. Comprehensive spectroscopic analyses combined with density functional theory (DFT) calculations reveal a synergistic electronic modulation mechanism. Crucially, the formation of electron-rich Mo centers significantly lowers the work function and establishes a robust electron reservoir. This configuration thermodynamically drives the rapid injection of photogenerated electrons into surface-adsorbed species, effectively reversing the rate-determining protonation step of CO 2 * to COOH* from an endergonic barrier to a spontaneous process. As a result, the optimized catalyst achieves a striking 34-fold increase in the CO production rate and reaches a CO to CH 4 selectivity of about 134. This study not only explains how activity is improved in non-oxide systems from several different aspects but also provides a clear and practical approach for designing future intermetallic photocatalysts by carefully tuning their energy bands and defect states.
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Journal of Energy Storage
·
2026
·
IF 10.7
Zahid Ali,Muhammad Mamoor,Kaili Gong,Abdul Majid Khan,Tianxiang Luan,Peizhou Li,Dan Huang,Mingwang Chang,Amr Awad Ibrahim,William W. Yu
To meet the demands for high-performance electrical supercapacitors, electrode materials need to be developed with high specific capacity, high energy density, and long cycle life. In this study, a zeolitic imidazolate framework (ZIF-8) and a zinc‑cobalt-bimetallic metal-organic framework (ZnCo-BMOF) were prepared. Then, the Zn 2+ ions present in these compounds were replaced with Fe 3+ ions using the Kirkendall effect to develop nitrogen-doped carbons containing iron and/or cobalt for supercapacitor applications. The textural properties of ZIF-8 and ZnCo-BMOF were examined using transmission electron microscopy, nitrogen sorption test, thermogravimetric analysis, and X-ray diffraction. The nitrogen sorption test reveals that ZIF-8 and ZnCo-BMOF have specific surface areas of 1900–1970 m 2 ·g −1 . The replacement of Zn 2+ ions with Fe 3+ ions reduces the specific surface areas of ZIF-8 and ZnCo-BMOF to 700–960 m 2 ·g −1 , resulting in a less-ordered but denser structure, with microporous channels fully available for the transport of electrolytic ions during the formation of electrical double-layer capacitance. Among the synthesized materials, the Fe/Co dual metal-doped N-containing carbon material exhibits the highest specific capacitance of 144.4 F·g −1 at a current density of 0.1 A/g. It exhibits long-standing cyclic performance with 90.6% retention of capacitance after 10,000 galvanostatic charge/discharge cycles.
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RSC Advances
·
2025
·Vol. 15
·期 24
·19522-19529
·
IF 4.6
Yaqi Ren,Junchen Tian,Sangwan Li,Xi Li,Xiangyuan Zhao,Xiang Wang,Pengchong Yang,Jiaming Ni,Xixi Ji,Pingping Liu
A phosphorus (P), and boron (B) enhanced N-doped carbon nanofiber materials was prepared via a facile electrospinning method as a binder-free anode for lithium-ion storage applications. The triple-doped binder-free electrode demonstrated a high specific capacity of 611.2 mA h g−1 at a current density of 0.1 A g−1 and a high capacity retention of 94.8% after 500 cycles. This work demonstrates that adding P and B in N-doped carbon materials can significantly improve electrochemical properties and provides a methodology for the development of carbon-based materials for energy storage applications.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Qian Yu-Ke,Feng Shao-Bo,Song Zi-Yuan
The preparation of polypeptide materials in continuous flow reactors shows great potential with improved reproducibility and scalability. However, conventional polypeptide synthesis from the polymerization of N -carboxyanhydride (NCA) is conducted at relatively slow rates, requiring long tubing or ending up with low-molecular-weight polymers. Inspired by recent advances in accelerated NCA polymerization, we report the crown-ether-catalyzed, rapid synthesis of polypeptide materials in cosolvents in flow reactors. The incorporation of low-polarity dichloromethane and the use of catalysts enabled fast conversion of monomers in 30 min, yielding well-defined polypeptides (up to 30 kDa) through a 20-cm tubing reactor. Additionally, random or block copolypeptides were efficiently prepared by incorporating a second NCA monomer. We believe that this work highlights the accelerated polymerization design in flow polymerization processes, offering the continuous production of polypeptide materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jiexiang Liu,Ping Wang,Xiaoguang Zhang
Firstly, the surfactant cetyltrimethylammonium bromide (CTAB) and 1-hexadecyl-3-methylimidazolium chloride monohydrate (HMCM) were intercalated into attapulgite (AP) to obtain CTAB-AP and HMCM-AP complexes, respectively, and then pesticide dinotefuran (DIN) was introduced into the complexes to prepare DIN/CTAB-AP (HMCM-AP) hybrids, finally the hybrids was added into N-isopropylacrylamide (NIPAM) solution to obtain DIN/CTAB-AP(HMCM-AP)/PNIPAM hydrogels through the free radical polymerization. Their structures were systematically characterized by XRD, FTIR, TGA , SEM and BET. The effect of hybrids content, crosslinker concentration and pH on the hydrogel was investigated and analyzed. The existence of DIN and surfactant molecules in the hydrogels was confirmed. Fabrication mechanism of DIN hydrogels was put forward. Release behaviors of the hydrogels were investigated in different release mediums and temperatures. For DIN/CTAB-AP/PNIPAM, DIN release amount increased from 79.5 % at 20°C to 97.7 % at 30°C. For DIN/CTAB-AP/PNIPAM and DIN/HMCM-AP/PNIPAM ( p = 4, 9.3) hydrogels, the release rates are much slower in pH= 5.0 than pH= 9.0. The release behaviors were well fitted by pseudo second-order and Ritger-Peppas models. Bioassays revealed extended efficacy against aphids (73 % mortality on third day for the third inoculation), suggesting a long duration and control effect of the hydrogels on the pest compared to the DIN water dispersible granules. This study provided a new method to improve the utilization efficiency of pesticide, and the hydrogel can be potentially used as a pesticide delivery system.
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BIOELECTROCHEMISTRY
·
2025
·
IF 4.5
Jiamu Li,Aijia Sun,Han Lai,Chuanhe Li,Huayi Li,Zhengchun Yang,Peng Pan,Jie He,Rui Zhang,Chunhong Wang
In this study, an electrochemical sensor for the specific detection of Pseudomonas aeruginosa ( P. aeruginosa ) was developed using an F23 aptamer-functionalized nitrogen-doped multi-walled carbon nanotubes (N doped-MWCNTs) and silver nanoparticles (AgNPs) composite. Systematic optimization of the Ag/C ratio revealed that a 1:10 composition delivers superior electrochemical performance, owing to synergistic effects between highly dispersed AgNPs and efficient nitrogen doping. Then a biosensor was constructed based on a three-electrode system, featuring a screen-printed electrode (SPE) modified with optimized N-doped MWCNTs/AgNPs-10/F23 aptamer as the working electrode. The structural and compositional characteristics of the sensor materials were systematically characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The electrochemical performance was evaluated through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to assess the conductivity and charge transfer properties of the electrode materials. The sensor exhibited a wide linear detection range from 10 −1 to 10 6 CFU·mL −1 and the limit of detection is 0.0798 CFU·mL −1 , demonstrating high specificity and sensitivity for P. aeruginosa . This study demonstrates a novel strategy for developing cost-effective, portable biosensors with exceptional selectivity for bacterial pathogen detection, offering significant potential for real-time environmental monitoring and point-of-care diagnostic applications.
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Journal of Energy Storage
·
2026
·
IF 9.8
Ting Liu,Menghui Yin,Beibei Li,Salifu Nasir,Qiang Chen
The accelerating demand for sustainable, high-rate, and durable energy storage underscores the need for carbon electrodes that simultaneously offer balanced micro–mesoporosity for rapid ion transport and robust heteroatom functionalities for enhanced interfacial chemistry. In the present work, we convert bitumen asphaltenes and recycled cellulose acetate into N/S co-doped hierarchical carbons via ammonium persulfate-assisted co‑carbonization and KOH activation. The optimized carbon combines an ultrahigh specific surface area of 3527 m 2 g −1 , balanced micro–mesoporosity, and uniformly distributed electroactive N/S species (pyridinic/pyrrolic N, C S, SO x ), enhancing conductivity and pseudocapacitance. In three-electrode tests, the electrode delivered 382.5 F g −1 at 0.5 A g −1 with 74% retention at 10 A g −1 . The symmetric aqueous device achieved a specific capacitance of 288.2 F g −1 at 0.5 A g −1 , energy densities of 10.01 Wh kg −1 at 257.4 W kg −1 and 5.42 Wh kg −1 at 6728.3 W kg −1 , and 108.7% capacitance retention after 10,000 cycles at 5 A g −1 . This study advances sustainable energy storage by enabling low-cost, high-performance supercapacitors and promoting solid-waste recycling.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Zhuo Pu,Qiuhao Wang,Liming Tao,Hongqi Fu,Jianyong He,Zhiyong Gao
Zircon is the primary mineral for zirconium and hafnium extraction. However, removing associated gangue minerals such as feldspar from fine zircon ore is challenging due to the limitations of utilizing a single collector. This paper proposed a mixed collector n-octylphosphonic acid (n-OPA)/octyl hydroxamic acid (OHA) to promote the separation of zircon and feldspar. Accordingly, solution chemistry calculations, zeta potential, surface tension measurements and density functional theory (DFT) calculations were performed to study the detailed adsorption mechanism of mixed collector on surface of zircon. Flotation results for single minerals demonstrated that the mixed collector effectively facilitated the separation of zircon from feldspar, achieving a maximum recovery difference exceeding 88.00%. Run-of-mine ore flotation tests indicated that the use of n-OPA/OHA as a collector resulted in a zircon concentrate with a ZrSiO 4 grade of 12.57% and a recovery of 82.21%. In contrast, when sodium oleate (NaOL) was used as the collector, the ZrSiO 4 grade and recovery were 8.33% and 66.01%, respectively. Solution chemistry calculations and zeta potential measurements indicated that at pH 2.0, the mixed collector exists in the forms of n-OPA molecules, n-OPA −1 , and OHA molecules. Following interaction with the mixed collector, the surface potential of zircon significantly decreased by 14.8 mV. Surface tension measurements demonstrated a positive synergistic effect between n-OPA and OHA. DFT calculations revealed that the intermolecular interaction energies between n-OPA-OHA and n-OPA −1 -OHA were 41.5 and 32.8 kJ/mol, respectively, primarily attributed to hydrogen-bonding between them.
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Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·197
·
IF 36.3
Ma Yuqiang,Li Meng,Zhang Dandan,Wang Cihang,Li Yu,Zhao Zihang,Mu Xiaogang,Hu Jun,Hu Xiang,Li Jiachen,Ma Haixia,Wen Zhenhai
Replacing anodic oxygen evolution reaction with 3,5-diamino-1,2,4-triazole oxidative coupling enables ultra-low-voltage (0.96 V @10 mA cm − 2 ) dual-electrode H 2 production and simultaneous synthesis of energetic 5,5′-diamino-3,3′-azido-1H-1,2,4-triazole (DAAT), achieving 35.8% energy savings.
A Pt single-atom/nanoparticle hybrid on NiS 2 nanosheets (Pt s,n @NiS 2 @CC) exhibits exceptional alkaline hydrogen evolution reaction performance and stability via optimized H* adsorption.
Anodic DAAT formation proceeds via an OH*-mediated N–N coupling pathway, enabling stable (> 300 h @500 mA cm − 2 ), industrial-scale bipolar H 2 production coupled with green DAAT synthesis in an anion-exchange membrane water electrolyzer.
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CURRENT APPLIED PHYSICS
·
2020
·
IF 2.281
Yanqun Chen,Chao Wang,Zheng Ma,Lanwei Li,Shuyao Li,Jianli Wang
n-type Mg 3 Sb 2 –Mg 3 Bi 2 alloy shows as a potential new thermoelectric material (TE) and has been widely researched recently. The pure phase n-type Mg 3 · 20 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 were prepared by adjusting Mg content with the Bi impurity phase being effectively suppressed. Then, Co element was doped into the pure phase and the electrical conductivity of samples were improved. With a high power factor of 20.3 μ W cm −1 K −2 for Mg 3·185 Co 0·015 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 at 525 K. Additionally, it was found that the phonon scattering is enhanced due to the larger atomic mass of Co comparing to Mg and the lattice thermal conductivity is reduced. As a result, a high ZT value of ~ 1.03 at 525 K is achieved for the Mg 3·185 Co 0·015 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 .
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MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Yi Zhang,Yachuan Shao,Cong Wang,Fei Yuan,Di Zhang,Zhaojin Li,Qiujun Wang,Huan Wang,Zhilin Hu,Bo Wang
Heteroatom doping has been proven to be an effective strategy to improve capacity and cycling stability of host materials by providing abundant defects and active sites for gust ions storage. Therefore, we synthesize N-doped porous carbon materials (NPC) and employ it as an anode for PIBs . The optimized NPC delivers a high capacity (284.9 mAh g −1 ), good rate capability, and long cycle lifespan (213.6 mAh g −1 at 2000 mA g −1 after 400 cycles). Through theoretical calculations, we further reveal that the improvement of electrochemical performance can be considerably ascribed to improved conductivity and adsorption energy induced by N doping .
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