ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhaojin Li,Wei Song,Di Zhang,Qiujun Wang,Huilan Sun,Qujiang Sun,Bo Wang
Co-free Li-rich Mn-based cathode materials (Co-free LRMOs) have become one of the most promising cathode materials in lithium-ion batteries for the next generation due to their low cost, high capacity, and environmental friendliness. Under high voltage, redox reactions involving anions can easily lead to various issues, including oxygen release, dissolution of transition metal elements (TMs), and structural collapse in these materials. The absence of the Co element further exacerbates this issue. Here, a simple one-step solid-phase reaction strategy is proposed to achieve nanoscale dual modification of the Co-free LRMOs with F and Tb doping. The dual modification has a relatively small impact on the cell parameters and Li+ diffusion ability of the LRMOs, leading to no significant improvement in its rate performance. The modified LRMOs only exhibited discharge capacities of 220.7, 200.1, 140.0, 115.5, and 90.9 mAh·g–1 at 0.1, 0.2, 1.0, 2.0, and 5.0 C, respectively. However, the modified Co-free LRMOs exhibit extremely strong structural stability and retain 95.1% of the initial capacity after 300 cycles, so far, the highest capacity retention rates among all Ni/Mn-based Li-rich materials. Mechanism studies have shown that the enhancement in structural stability of the Co-free LRMOs is attributed to the increased concentration of oxygen vacancies and Ni3+ ions through F doping. Furthermore, Tb doping not only hinders the release of O2 but also enhances the Li+ migration and electronic conductivity coefficient of the LRMOs.
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PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Shupin Ye,Yuteng Fu,Fangjian Ning,Jianyong Wu,Shunjing Luo,Jiangping Ye,Chengmei Liu
Polyphenolic compounds demonstrate significant potential in inhibiting starch digestion. However, the poor solubility, poor reactivity and easy degradation of polyphenols limit their effectiveness on starch digestion. The present study aims to avoid polyphenolic limitation in an effective strategy with the utility of rutin nanoparticles, and to co-gelatinize them with rice starch for regulating starch digestibility. SEM and XRD analysis had shown that rutin existed in an amorphous and non-inclusion state within NPS sample. It was accompanied by the absorption peak intensity related to hydrogen bonding weakened and shifted to lower wavenumbers in FTIR analysis. The double-helical domain formation increased from 4.57 % to 6.13 % in 13 CP/MAS NMR analysis. In-vitro digestion study showed that rutin nanoparticles exhibited maximum inhibition of starch digestion. Rutin was gradually released from NPS sample during digestion, with the highest concentration of rutin in its digestive fluid, showing the highest inhibition for digestive enzyme activity with values decreasing from 0.178 U/mL to 0.081 U/mL. Therefore, rutin nanoparticles can significantly regulate starch digestion by altering rice starch structural domains and inhibiting digestive enzyme activity. Overall, this study established a novel strategy to inhibit starch digestion by polyphenol nanoparticles, offering potential applications in low-glycemic starchy foods.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shihai Sun,Shuo Dong,Lufang Xie,Minghui Lu,Liying Liu
Carbon capture represents a critical strategy for reducing greenhouse gas emissions and mitigating climate change. High-performance adsorbents with excellent CO 2 selectivity are essential for applications in post-combustion capture and natural gas purification. In this study, we report the synthesis of a high-purity silicon-based molecular trapdoor adsorbent (SBMTA) by hydrothermal and seed-guided methods. The CO 2 adsorption performance of SBMTA was thoroughly evaluated, and its selectivity toward CO 2 over N 2 and CH 4 was quantified using the Ideal Adsorption Solution Theory (IAST). At 333 K and 1 bar, SBMTA exhibits a CO 2 uptake of 1.4 mmol/g, with remarkable IAST selectivity values of 2555 for CO 2 /N 2 and 2291 for CO 2 /CH 4 . This is attributed to the trapdoor effect associated with K + within the molecular sieve. Dynamic binary gas breakthrough experiments were conducted to assess adsorption performance under varying temperatures, and cyclic separation efficiency was evaluated using a single-column three-step cycling process. At a gas flow rate of 0.15 L/min, with adsorption and desorption times of 70 s and 30 s respectively, the product gas purity reached 34.14% and a recovery rate of 86.71%. These results demonstrate that directly synthesized SBMTA holds great promise for efficient carbon dioxide capture from flue gas and natural gas streams.
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高影响因子
Science China-Chemistry
·
2016
·Vol. 59
·期 11
·1397-1404
·
IF 2.429
Jia Huizhen,Chen Si,Zhuo Renxi,Feng Jun,Zhang Xianzheng
A polymeric polyethylenimine (PEI)-based prodrug of anticancer doxorubicin (DOX) (PEI-hyd-DOX) was designed by attaching DOX to PEI via an acid-labile hydrazone bond, for the achievement of biocontrollable gene and drug co-delivery in response to the intracellular acid microenvironments in the late endosome/lysosome compartments. The cytotoxicity of PEI-hyd-DOX was evaluated by the MTT assay and the cellular uptake was monitored using confocal laser scanning microscopy. The polymeric prodrug can respond with a high sensitivity to the specific acid condition inside cells, thus permitting the precise biocontrol over intracellular drug liberation with high drug efficacy. The chemical attachment of drug molecules also led to the relatively reduced toxicity and the enhanced transfection efficiency compared with parent PEI. The resulting data adumbrated the potential of PEI-hyd-DOX to co-deliver DOX and therapeutic gene for the combination of chemotherapy and gene therapy.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 33
·6025-6032
·
IF 11.382
Yuyang Li,Guanghua Liu,Tengfei Cao,LiMin Liu,Jiangtao Li,Kexin Chen,Laifeng Li,Yemao Han,Min Zhou
Dense bulk samples of (Ag,In)-co-doped Cu 2 SnSe 3 have been prepared by a fast and one-step method of combustion synthesis, and their thermoelectric properties have been investigated from 323 to 823 K. The experimental results show that Ag-doping at Cu site remarkably enhances the Seebeck coefficient, reduces both electrical and thermal conductivities, and finally increases the figure of merit (ZT) value. The ZT of the Cu 1.85 Ag 0.15 SnSe 3 sample reaches 0.80 at 773 K, which is improved by about 70% compared with the unadulterated sample (ZT = 0.46 at 773 K). First principle calculation indicates that Ag-doping changes the electronic structure of Cu 2 SnSe 3 and results in larger effective mass of carriers, thus enhancing the Seebeck coefficient and reducing the electrical conductivity. The low electrical conductivity caused by Ag-doping can be repaired by accompanying In-doping at Sn site, and by (Ag,In)-co-doping the thermoelectric properties are further promoted. The (Ag,In)-co-doped sample of Cu 1.85 Ag 0.15 Sn 0.9 In 0.1 Se 3 shows the maximum ZT of 1.42 at 823 K, which is likely the best result for Cu 2 SnSe 3 -based materials up to now. This work indicates that co-doping may provide an effective solution to optimize the conflicting material properties for increasing ZT.
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Nanomaterials
·
2022
·Vol. 12
·期 18
·3234
·
IF 5.719
Tianen Chen,Allen Yang,Wei Zhang,Jinhui Nie,Tingting Wang,Jianchao Gong,Yuanhao Wang,Yaxiong Ji
Herein, we present an innovative graphene oxide (GO)-induced strategy for synthesizing GO-based metal-organic-framework composites (Co-BTC@GO) for high-performance supercapacitors. 1,3,5-Benzene tricarboxylic acid (BTC) is used as an inexpensive organic ligand for the synthesis of composites. An optimal GO dosage was ascertained by the combined analysis of morphology characterization and electrochemical measurement. The 3D Co-BTC@GO composites display a microsphere morphology similar to that of Co-BTC, indicating the framework effect of Co-BTC on GO dispersion. The Co-BTC@GO composites own a stable interface between the electrolyte and electrodes, as well as a better charge transfer path than pristine GO and Co-BTC. A study was conducted to determine the synergistic effects and electrochemical behavior of GO content on Co-BTC. The highest energy storage performance was achieved for Co-BTC@GO 2 (GO dosage is 0.02 g). The maximum specific capacitance was 1144 F/g at 1 A/g, with an excellent rate capability. After 2000 cycles, Co-BTC@GO 2 maintains outstanding life stability of 88.1%. It is expected that this material will throw light on the development of supercapacitor electrodes that hold good electrochemical properties.
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高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 25
·e202304989
·
IF 1.9
Ying Chen,Zhangyi Lv,Jinqiu Yuan,Mingchun Bi,Yuning Liang
Graphical ZIF-67 nanocubes (ZIF-67 NCs) had been etched to produce small amounts of cross-linked Co-LDH-1 while preserving the cubic structure, which provided sufficient quantities of cobalt ions. The catalytic activity of OER has been enhanced by the cubic-structured LDH, which leads to a significantly lower overpotential in alkaline media and a calculated lower activation energy Ea. To address the substantial energy needs of the quickly evolving modern civilization, efforts are still needed to provide sustainable renewable energy sources. The electrocatalytic Oxygen evolution reaction (OER) is one of the essential technologies used in the various hydrogen production techniques. ZIF-67 nanocubes (ZIF-67 NCs) were synthesized in an aqueous solution and used as sacrificial templates. Cobalt nitrate hexahydrate was added under water bath conditions, resulting in the evolution of numerous small layered layers of cobalt hydroxide. This ultimately led to the formation of multilayered, three-dimensionally crosslinked Co-LDH with a porous networked cubic morphology. Hydrolysis of Co 2+ at different concentrations produces different degrees of weak acidic environments, and the loose LDH on the cubic structure of the best catalyst, Co-LDH-1, exposes more active cobalt sites for the OER, which results in a high electrochemically active surface area, with an overpotential of 354 mV and a Tafel slope of 79.06 mV dec −1 at a current density of 10 mA cm −2 , and good stability and low activation under alkaline condition also has good stability and low activation energy. It provides us an easy and practical plan for logically creating ZIF-derived hydroxide materials, leading to the development of affordable and effective electrocatalysts.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Huihuang Shen,Changdong Ju,Junjun Wang,Huabo Huang,Jiayou Ji,Liang Li
There is a challenge to boost the electromagnetic wave absorption performance of magnetic carbon-based materials by rationally adjusting the structure of MOF. In this paper, nanoclip-shaped polypyrrole (PPy) was wrapped on the surface of the Co/C nanoparticle derived from Co-MOF via in-situ polymerization of pyrrole with the help of cetylammonium bromide. The electromagnetic parameters of prepared Co/C@PPy can be easily tuned by adjusting the feed ratio of PPy to Co/C. The optimum value of reflection loss (RL) for Co/C@PPy is −45.49 dB at 2.4 mm and 15.12 GHz when the feed ratio of pyrrole to Co/C is 200 μL to 80 mg, and the effective absorption bandwidth (EAB, RL ≤ −10 dB) reaches 5.97 GHz (11.76–17.73 GHz) at the matching thickness of 2.5 mm. This study paves the way for further design and preparation of the nanocomposites based on MOF-derived nanostructures with excellent EMW absorption performance.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xinya Wang,Qi Wang,Wei Zhang,Ruirui Cao,Mingxing Chen,Changfa Xiao
With the escalating issue of air pollution, the development of air filtration materials that can efficiently remove particulate pollutants, particularly nanosized particles, from air has attracted more and more research attention in recent years. Electrospun nanofiber membranes with a nanoscale pore structure have been widely used as air filtration materials. Along these lines, in this work, polyvinylidene fluoride-co-hexafluoropropyle (PVDF-HFP) nanofiber membranes with a multihierarchical gradient structure were fabricated by varying the sodium dodecyl sulfate (SDS) concentration. The proposed multihierarchical gradient structure was composed of upper, middle, and lower nanofiber layers, which could effectively filter PM0.3. The decreased nanofiber diameter by increasing the SDS concentration was attributed to the low surface tension and high charge balance. Compared with the single- and double-hierarchical PVDF-HFP nanofiber membranes, the triple-hierarchical PVDF-HFP nanofiber membranes demonstrated excellent air filtration performance. Among them, F014 yielded optimal air filtration performance, exhibiting a high filtration efficiency of 99.50%, a low pressure drop of 71.4 Pa, and a quality factor of 0.0878 Pa–1. Furthermore, the filtration efficiency was maintained above 99% and the pressure drop just increased by 27.4% over a 40 min air filtration test, which indicated that F014 showcased exceptional durability, owing to the multihierarchical gradient structure. Our work paves the way for the fabrication of electrospun nanofiber membranes with a multihierarchical gradient structure using a straightforward method, highlighting their potential as an alternative to traditional air filter materials for various practical applications.
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Science Bulletin
·
2025
·
IF 21.1
Tongtong Yang,Heng Liu,Hengjie Liu,Weiyi Zhao,Jiawei Ge,Wenhui Wang,Shuai Yang,Meijian Tang,Kai Wei,Kangcheng Wang,Zeming Qi,Xian Wang,Hao Li,Junjie Ge
Single-atom catalysts (SACs) challenge conventional multi-site catalysis by enabling oxidative processes like H 2 and CO oxidation. However, we herein present that the completely isolated SACs are inactive, while spatially adjacent single-atom pairs (interatomic distance < 4 Å) work cooperatively as the true active sites. Rh atomic densities were precisely tuned between 0.1 wt%–17.5 wt% via graphene quantum dots confinement. Mathematical modeling quantifies the scaling of active pairs versus electrochemical performance, rationalizing activity dependence on atomic proximity. 18 O isotope labeling and in situ synchrotron infrared spectroscopy analyses identified a new reaction mechanism, with water bifunctional dissociation enabled on sub-4 Å Rh pairs, and acts as the rate-determining step towards both CO and H 2 oxidation. While H 2 O enters the COOR process as a reactant and enters the HOR process as a molecular catalyst. Our findings redefine bifunctional catalysis, merging single-atom precision with nanoparticle-like cooperativity for efficient energy conversion systems.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Zhengjuan Wang,Xiaojun Wang,Guohong Zhou,Jianjun Xie,Shiwei Wang
Highly transparent yttrium titanate (Y 2 Ti 2 O 7 ) ceramics were fabricated by vacuum sintering using co-precipitated powders for the first time. The effects of the powder calcination temperature on the phase composition, morphology of the calcined powders, and on the microstructure and transmittance of the Y 2 Ti 2 O 7 ceramics were investigated. When the calcination temperature was above 850 °C, pure phase Y 2 Ti 2 O 7 nanopowders with high sintering activity were obtained. Transparent Y 2 Ti 2 O 7 ceramics were obtained after vacuum sintered at 1600 °C for 6 h and annealed at 1100 °C for 5 h in air. The highest transmittance reached 73% at 1000 nm when the calcination temperature was 1150 °C. The measured refractive index of Y 2 Ti 2 O 7 ceramics was higher than 2.24 at the wavelength range of 350–1000 nm, making it a promising candidate for optical devices.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Chunhui Xu,Hongyun Jin,Qifeng Zhang,Can Huang,Daifeng Zou,Fujian He,Shuen Hou
Pure pyrochlore Lanthanum zirconate (LZ) was synthesized by co-ions complexation method (CCM) at 1300 °C, which is 300 °C lower than that by solid-state method (SSM). At 1450 °C, the LZ prepared by CCM possessed lower thermal conductivity (1.15 W/m K) than that obtained by SSM (1.99 W/m K). This significant decrease may be caused by the different grain size, which is 300 nm and 2.5 μm synthesized by CCM and SSM, respectively. LZ precursor was belt-shaped and the belt shorten and the grain grown with the temperature increasing. Fourier transform infrared spectroscopy suggested the solidification in CCM forms from the complexation between La 3+ , Zr 4+ and CH 3 COO − , which is the key for solidification. Compared to SSM, CCM is a lower temperature and simpler technology to synthesize nano-size LZ and other rare-earth oxides .
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