CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 12
·17518-17528
·
IF 5.532
Yu Zhao,Liaoyuan Chen,Jiayu Sun,Wenzheng Wu,Tianbiao Yu
Poor mechanical properties of Ni alloy hinder its widespread application in the industrial. In order to enhance its performance, Ni204-based composite coatings reinforced with in-situ TiC and (Ti, Nb)C particles were investigated and successfully built on 45 steel alloy via laser cladding technology. The strengthening phase characteristics, microstructure evolution, and mechanical properties of the samples were examined and analyzed. By doping Ti and C particles into the NbC–Ni composite coatings, the large lump structure of NbC was effectively eliminated. The alternative formation of TiC and NbC promoted the in-situ generation of the multiphase (Ti, Nb)C and further prevented the NbC from agglomerating. Therefore, the problem of TiC particles floating has been effectively alleviated. The microhardness is up to 1.53 higher than that of the original Ni204 coating. Compared with the mass fraction ratio of Ti/C/NbC is 7:2:21 composite coating, the wear resistance of the composite coating (the addition of NbC is 30%) is improved by around 11 times. The composite coating has excellent combination property when the mass fraction ratio of Ti/C/NbC is 4:1:5. This work provides insight into the Ni204-based composite coatings by ceramic reinforcement.
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DOI
高影响因子
SOLID STATE IONICS
·
2015
·
IF 2.561
Xiaobing Huang,Yaoyao You,Yurong Ren,Haiyan Wang,Yuandao Chen,Xiang Ding,Beiping Liu,Shibiao Zhou,Fuqiang Chu
Improving the rate performance is still a major challenge for Li 2 FeSiO 4 cathode material for Li-ion battery. Herein, hollow spherical Li 2 FeSiO 4 /C microscale particles, consisting of carbon-coated primary nanoparticles (20–40 nm) have been fabricated by a spray drying-assisted method. The particle size of spherical Li 2 FeSiO 4 /C is 1–5 μm, which is suitable for commercial application. When used as a cathode material for Li-ion battery, the as-prepared Li 2 FeSiO 4 /C composite with 16.7 wt.% carbon exhibits a high discharge capacity of 165 mAh g − 1 at 0.2 C rate. At 0.5 C, 5 C and 10 C rates, the capacities of 151 mAh g − 1 , 111 mAh g − 1 , and 96 mAh g − 1 are observed, respectively, indicating superior rate performance. Meantime, good cycling stability is achieved with a capacity retention of 94.5% at a high current density of 2 C after 100 cycles. The excellent electrochemical performance is mainly ascribed to the improved ionic/electronic conductivity arising from the hollow spherical structure and carbon-coated primary nanoparticles . The spray drying process shows a great potential for the large scale production of high quality Li 2 FeSiO 4 /C composite.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 42
·16653-16660
·
IF 8.262
Tao Yang,Xiuli Wang,Donghuang Wang,Shuhan Li,Dong Xie,Xuqing Zhang,Xinhui Xia,Jiangping Tu
Lithium sulfide (Li2S) is one of the most promising cathode materials for the next-generation advanced Li-ion batteries because of its high theoretical capacity (1167 mA h g−1) and large energy density. However, Li2S suffers from poor rate performance and short cycle life due to its insulating nature and polysulfide shuttle during cycling. In this work, we have proposed a facile and scalable strategy for the synthesis of nanosized Li2S particles via a solution-based method. For further application in Li–S batteries, chemical vapor deposition (CVD) technology is used to successfully deposit a uniform conductive carbon layer on the Li2S particles to obtain a core–shell structured nanocomposite (nano-Li2S@C). The average size of the as-prepared nano-Li2S particles is around 100 nm, and covered by a carbon shell with a thickness of ∼20 nm. These nanoscale Li2S@C particles guarantee a short diffusion distance of lithium ions and the protective carbon layer allows fast electron transport as well as effectively constraining the migration of the soluble polysulfides. As a result, the core–shell structured nano-Li2S@C cathodes show outstanding electrochemical performance with a high initial discharge capacity of 1083.5 mA h g−1 at 0.2C and 766.3 mA h g−1 after 200 cycles with a low decay of 0.15% per cycle. The enhanced electrochemical performance is due to the core-shelled architecture with enhanced electrical conductivity and better suppression effect for the polysulfide shuttle.
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Bo Wang,Congyang Zhang,Weilin Zheng,Qinggang Zhang,Zhongqiu Bao,Long Kong,Liang Li
Perovskite nanocrystals (NCs) as promising narrow green emitters are widely studied, and many colloidal synthetic methods have been developed. However, large amounts of expensive and toxic organic solvents are consumed in synthesis. Herein, a high temperature solid-state confined growth strategy was developed to prepare highly emissive CsPbBr3 NCs using the in situ formed mesoporous Al2O3 as the template. The obtained CsPbBr3–Al2O3 powders possessed high quantum yield up to 70%, narrow emission line width of 25 nm, and outstanding thermal stability even better than the KSF phosphor. In addition, 500 g CsPbBr3–Al2O3 powders in one batch have been achieved, which demonstrated the potential capability of mass production with this method. Finally, this method can be expanded to other CsPbX3 (X = Cl, I) NCs through changing the halide salts. We believe that this versatile method opens up a new avenue for the large scale synthesis of high quality perovskite NCs with low cost.
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DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2014
·Vol. 146
·期 3
·441-447
·
IF 1.347
Li Longfei,Chen Lin,Liu Weifeng,Yang Yongzhen,Liu Xuguang,Chen Yongkang
5-Fluorouracil surface-imprinted thermosensitive magnetic microspheres were prepared by using Fe 3 O 4 -encapsulating carbon microspheres as cores, N -isopropylacrylamide as thermosentitive monomer, ammonium persulfate as initiator, N , N ′-methylenebisacrylamide as crosslinker, and 5-fluorouracil as template molecule. The formation of these hybrid microspheres was verified by field emission scanning electron microscopy, transmission electron microscopy, Fourier transformation infrared spectroscopy, thermogravimetry, and dynamic light scattering. The results of the latter measurements show that the as-synthesized microspheres have a hydrodynamic diameter of 326 nm with the lower critical solution temperature of around 43 °C. The obtained microspheres are magnetic and show good potential for controlled loading and release of 5-fluorouracil. Graphical abstract
研究领域:
药剂学
·
纳米医学
·
肿瘤治疗
·
高分子材料科学
·
靶向给药系统
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DOI
高影响因子
Alexandria Engineering Journal
·
2024
·
IF 6.2
Hong Zhang,Ming Chen,Tiantian Liang,Zanpeng Zhang,Changhui Yang
The use of nanocarbon materials to enhance the toughness of fragile cementitious materials has attracted increasing attention for investigation. This study examines the effects of incorporating graphene oxide (GO) into NaOH-activated slag (AAS) pastes and mortars, focusing on workability, phase composition, mechanical properties, and the local mechanical properties of the interfacial transition zone (ITZ) between sand and paste. The experimental results indicate that the addition of GO decreases the flowability of NaOH-AAS pastes, with noticeable aggregation at concentrations above 0.03 wt%. Furthermore, GO enhances the hydration degree of ground granulated blast furnace slag (GGBS), leading to an increased amount of C-A-S-H gel without introducing new phases. In terms of macro performance, incorporating 0.03 wt% GO significantly improves the compressive and flexural strengths of NaOH-AAS mortars by 10.6 % and 17.9 %, respectively. Additionally, the presence of GO reduces the ITZ thickness from 30 to 15 micrometres in NaOH-AAS mortars, which likely contributes to the enhanced mechanical performance.
研究领域:
材料科学
·
水泥基材料
·
纳米复合材料
·
建筑材料化学
·
界面工程
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DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2013
·Vol. 31
·期 3
·371-376
·
IF 0.917
Wei Zhu,Haoyang Wang,Haihui Peng,Guosheng Liu,Yinlong Guo
Pd-catalyzed oxidative coupling reaction was of great importance in the aromatic C H activation and the formation of new C O and C C bonds. Sanford has pioneered practical, directed C H activation reactions employing Pd(OAc) 2 as catalyst since 2004. However, until now, the speculated reactive Pd(IV) transient intermediates in these reactions have not been isolated or directly detected from reaction solution. Electrospray ionization tandem mass spectrometry (ESI-MS/MS) was used to intercept and characterize the reactive Pd(IV) transient intermediates in the solutions of Pd(OAc) 2 -catalyzed oxidative coupling reactions. In this study, the Pd(IV) transient intermediates were detected from the solution of Pd(OAc) 2 -catalyzed oxidative coupling reactions by ESI-MS and the MS/MS of the intercepted Pd(IV) transient intermediate in reaction system was the same with the synthesized authentic Pd(IV) complex. Our ESI-MS(/MS) studies confirmed the presence of Pd(IV) reaction transient intermediates. Most interestingly, the MS/MS of Pd(IV) transient intermediates showed the reductive elimination reactivity to Pd(II) complexes with new C O bond formation into product in gas phase, which was consistent with the proposed reactivity of the Pd(IV) transient intermediates in solution.
研究领域:
有机化学
·
金属有机化学
·
分析化学
·
催化化学
·
质谱学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·47025-47037
·
IF 5.8
Wang Tianyu,Yang Lang,Rao Feng,Jiang Kaixi,Byrynnai Choduraa
Adding organics in the process of geopolymer synthesis can combine the functional groups of organics with the three-dimensional structure of geopolymer, thus changing the properties of geopolymer such as compressive strength, flexural strength, and acid resistance. In this work, excellent mechanical properties and acid resistance of metakaolin-blast furnance slag (Mk-BFS)-based geopolymer were synthesized by the incorporation of chitosan. The formation of sodium-alumino-silicate-hydrate (N-A-S–H) gel and calium-alumino-silicate-hydrate (C-A-S–H) gel in geopolymerization were characterized by 29 Si nuclear magnetic resonance (NMR). At 5% of chitosan, the compressive strength of Mk-BFS-based geopolymer could reach to 33.7 MPa. The results could be ascribed to that chitosan reacts with geopolymer to generate new C-O-Si structure meanwhile adhesion produced by the combination of positively charged cations and negatively charged ions makes the structure of geopolymer denser. After 7 days of sulfuric acid immersion, the reduction of compressive strength is less than 3 MPa, demonstrating its great acid resistance. The acid resistance of Mk-BFS-based geopolymer could attribute to that the free amino groups in chitosan preferentially react with acid solution and weakened the erosion of sulfuric acid. This study optimizes the compressive strength and acid resistance of geopolymer by adding appropriate amount of chitosan.
研究领域:
材料科学
·
硅酸盐化学
·
无机非金属材料
·
功能复合材料
·
建筑材料
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 11
·e70420
·
IF 0
Hui Bai,Guyu Zhang,Fengqin Tang,Lili Huang,Mingxia Tian,Libing Hu,Zhenghang Qi,Jianhui Jiang
Developing porous-structured organic semiconductor photocatalysts with high charge transfer efficiency is crucial for solar energy utilization, yet remains challenging in pollutant remediation. Herein, an S-scheme C-ZnO/B-g-C 3 N 4 photocatalyst with oxygen vacancies was fabricated through modified biomass-derived C doping for methylene blue (MB) degradation. The optimized catalyst achieved 97.8% degradation efficiency within 70 min under visible light. UV-DRS analysis revealed that C doping narrowed the bandgap and enhanced visible-light absorption. XPS results confirmed the S-scheme charge transfer pathway in C-ZnO/B-g-C 3 N 4 . The synergistic effects of C doping and oxygen vacancies significantly improved charge separation and facilitated S-scheme heterojunction formation. The catalyst exhibited superior photocatalytic performance in alkaline conditions and maintained excellent recyclability. Radical trapping experiments identified the primary reactive species as h + > ·O 2 − > ·OH in descending order of contribution. This work provides a promising strategy for solar-driven pollutant remediation by combining biomass-derived carbon modification with S-scheme heterojunction engineering.
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产品关联
DOI
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yanyang Wang,Weilai Xu,Fupeng Liu,Xue Li,Jiaming Liu,Kailei Sun,Ruixiang Wang
s The practical application of transition metal phosphides (TMPs) in lithium-ion batteries (LIBs) has been severely hindered, primarily due to slow reaction kinetics and significant volume changes. While optimizing nanostructures could mitigate these issues, it remains a considerable challenge. Herein, NiFeP/C@rGO composites were synthesized through a multi-step protocol, involving coprecipitation, electrostatic self-assembly, and low-temperature phosphatization. The composites feature reduced graphene oxide (rGO)-coated nano-cubic frameworks derived from Prussian blue analogues (Ni/Fe-PBA), where the rGO carbon layer serves dual functions: effectively buffering volume expansion during charge/discharge cycles and enhancing overall electrical conductivity. Furthermore, the bimetallic heterostructure synergistically optimizes electrochemical performance. Remarkably, the optimized NiFeP/C@rGO-21 electrode demonstrates outstanding cycling stability, maintaining a specific capacity of 530.4 mAh g −1 after 300 cycles at a high current density of 1000 mA g −1 .
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Na Hong,Nian Li,Yanping Song,Shuai Han,Shudong Zhang,Zhao Li,Jun Kang,Cui Liu,Shihao Wang,Min Xi,Yongfeng Wang,Zhenyang Wang
High-capacity silicon/carbon composite anodes for lithium-ion batteries face rapid capacity degradation from extreme volume changes due to conventional organic-dominated solid electrolyte interphase (SEI) lacking mechanical/ionic stability. Constructing robust inorganic SEI (e.g., LiF-dominated interphases) requires synergistic control of electrolyte interactions at the inner Helmholtz plane (IHP) and stress-adaptive interfacial architectures. Herein, a hierarchical dual-coating strategy integrating polyaniline (PANi) and laser-induced graphene (LIG) on SiO x anodes addresses this challenge. PANi layer selectively enriches fluorinated ethylene carbonate (FEC) at the IHP via dipole-dipole interaction, enabling preferential FEC reduction at 1.3 V (vs. Li/Li + ) to form LiF-dominated SEI. Theoretical calculations confirm higher FEC adsorption density and stronger adsorption energy on the hierarchically dual-coated SiO x /LIG/PANi-2 (−0.33 eV) versus bare SiO x (−0.09 eV). Meanwhile, LIGʼs 3D porous conductive scaffold dissipates stress, sustaining structural integrity under repeated expansion. The optimized SiO x /LIG/PANi-2 anode achieves 1812.5 mAh g −1 initial capacity with 90.5 % initial Coulombic efficiency at 0.1 A g −1 and retains 87.7 % capacity after 1000 cycles at 2.0 A g −1 , demonstrating exceptional electrochemical stability. Post-cycling analyses further validate the homogeneity of LiF-rich SEI, robust mechanical resilience, and exceptional electrode integrity. This atomic-scale IHP regulation, harmonized with macro-scale stress engineering, offers scalable strategies for silicon anodes in high-energy-density batteries.
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产品关联
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2026
·Vol. 98
·期 2
·e70317
·
IF 2.8
Wenxiao Zhang,Chenzhi He,Ji Tang,Wei Wang,Yanyan Guo,Youcai Zhao,Tao Zhou
Anaerobic digestate, a typical by-product of large-scale biogas plants, faces mounting disposal pressure due to the rapid increase in organic solid waste. In this study, an iron-carbon composite was produced from digestate through polyethylene glycol (PEG)-assisted iron modification followed by low-temperature carbonization. The resulting material exhibited a mesoporous texture, oxygen-containing surface functionalities, and Fe 3 O 4 /Fe 3 C domains, enabling efficient removal of Congo red in batch systems. Removal was favored under mildly acidic conditions. At pH 4 and 298 K, the maximum experimentally observed equilibrium uptake reached 1267.35 mg·g −1 at high initial concentration, and removal efficiencies approached 99% under the tested conditions. The adsorbent retained more than 95% of its initial removal performance after five regeneration cycles. Kinetic and equilibrium analyses, together with FTIR/XPS and post-adsorption characterization, support that uptake involves Fe-associated interactions, electrostatic effects, and hydrogen bonding, with additional high-coverage accumulation contributing at elevated concentrations. Overall, this work demonstrates a practical route to valorize anaerobic digestate into a reusable adsorbent for removing azo dyes from wastewater. Graphical Valorizing anaerobic digestate into a magnetically recoverable Fe-C adsorbent enables efficient Congo red removal: near-complete decolorization at pH 4, 298 K, maximum observed q e 1267.35 mg·g −1 , and > 95% performance after 5 cycles. A single-step, low-temperature process offers a scalable, low-cost wastewater solution.
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产品关联
DOI
PubMed
高影响因子
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