JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hang Fu,Chonghua Shi,Zhitong Li,Jiajin Nie,Shaowei Yao
Herein, a unique dodecahedron composite material of Zn-Co bimetallic zeolitic imidazolate frameworks (ZIFs) and carbon nanotubes (CNTs) is synthesized by a simple room temperature static precipitation-annealing process. As an anode material for lithium-ion batteries (LIBs), the designed nanomaterials exhibits excellent lithium storage performance and cycle performance. It demonstrates a high discharge specific capacity of 720.9 mAh g -1 at 100 mA g -1 . Besides, a high reversible capacity of 608.7 mAh g -1 at a current density of 500 mA g -1 after 300 cycles. The significant improvement in the electrochemical performance of Zn/Co-ZIFs/CNTs nanocomposite can be attributed to the strong synergy between Zn/Co-ZIFs and CNTs.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Dongdong Li,Qian Zhang,Zhichuan Shen,Kumar Siddharth,Lijuan Chen,Minhua Shao,Zhicong Shi
Rechargeable lithium oxygen batteries (LOBs) are one of the most promising energy storage systems by virtue of their high energy density and environmental amiability. However, the development of LOBs is still hindered by some critical issues. Herein, 3D hexapod-shaped Co-ZIFs-thiourea/dimethyl sulfoxide (H-Co-ZIFs-S) derived Co nanoparticles embedded into nitrogen and sulfur co-doped carbon (H-Co-NSC) are developed, and then low content of ruthenium nanoparticles are decorated on the surface to obtain Ru/H-Co-NSC as efficient catalyst for LOBs. The Ru/H-Co-NSC catalysts exhibits unique structure and catalytic properties , such as accommodating the insoluble discharge product Li 2 O 2 , promoting the transportation of ions/O 2, enhancing the electronic conduction, demonstrating excellent OER/ORR kinetics as well. In addition, the Ru-decorated nanoparticles could effectively suppress some side-reactions caused by the exposed carbon of H-Co-NSC in LOBs. First-principles Density functional theory (DFT) calculations reveal the cooperative effect of multiple active sites in Ru/H-Co-NSC can effectively promote the ORR/OER kinetics in LOBs. Therefore, the LOBs with Ru/H-Co-NSC cathode provide a positive catalytic capacity with low overpotential, large specific capacities, long cycle life and superior reversibility . Our work may pave the way to design more advanced catalysts for metal-air batteries with superior electrochemical performance.
研究领域:
材料科学
·
电化学
·
储能系统
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Ruth Antwi-Baah,Malcom Frimpong Dapaah,Yajing Wang,Xiaoqin Chen,Heyang Liu
Zeolitic imidazolate frameworks (ZIFs) show promise in fighting bacterial resistance, yet crucial gaps in research hinder their clinical use. For the first time, through meticulous exploration, we unravel the correlation between the size, shape, and zinc/cobalt ion content of 25 ZIF variants and their antibacterial performance in addition to their mechanism pattern, giving special focus to oxidative stress. Notably, a novel morphology-size map of the 25 different ZIFs is established under five main groups namely, small cubes (SC), large cubes (LC), rhombic dodecahedron-large cubes (RD-LC), rhombic dodecahedron (RD), and spherical-rhombic dodecahedron (S-RD) ZIFs. The antibacterial experiments against Staphylococcus aureus showed that ZIFs in the SC group with higher cobalt content had the lowest minimum inhibition concentration (MIC) of 12.5 μg mL−1. Conversely, increased zinc content yielded better antibacterial activity for the other groups. Furthermore, our investigation into the mechanisms revealed cobalt's crucial role in fostering reactive oxygen species (ROS) accumulation, correlating with glutathione (GSH) depletion. Remarkably, the differential responses of ZIF-8 and ZIF-67 to the antioxidant N-acetyl cysteine (NAC) shed light on nuanced pathways governing antibacterial performance. While ZIF-8 demonstrated reduced efficacy, the antibacterial performance of ZIF-67 remained either sustained or modestly improved under antioxidant conditions. Overall, these findings not only enrich our comprehension of ZIFs but also propel their potential for targeted antibacterial interventions, thereby fostering confidence in their clinical translation.
研究领域:
材料科学
·
微生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 48
·36063-36072
·
IF 3.9
Xuebin Hou,Wei Chen,Meihong Fan,Chen Shi
Chitosan (CS) is regarded as a promising sorbent due to its biodegradability, wide availability, easy processing, and multiple active groups. In this work, CS-based porous fibers (ZIF-n@CS) consisting of CS and zeolitic imidazolate frameworks (ZIFs) were fabricated through wet spinning and self-assembly methods. This combination effectively utilizes the dual advantages of CS and ZIFs, which effectively remove dyes from water and exhibit excellent recyclability. In addition, the adsorption mechanism of the adsorbent was explored through the analysis of adsorption kinetics, thermodynamics, isotherms, and chemical characterization after adsorption. This work provides an operable and universal strategy for the efficient adsorption of dyes, promoting the further promotion and application of MOFs and CS materials.
研究领域:
材料科学
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Dandan Ma,Zhonghan Cheng,Ye Yuan,Somboon Chaemchuen
The zeolitic-imidazole frameworks (ZIFs) have become popular due to their uniformly structured cavities and portals of framework dimensions, which make them suitable for numerous applications. In order to access pores and functional surfaces, thermal activation is significantly post-treatment on the synthesis of ZIFs for their applications. This study explores the impact of different thermal activation conditions on two- to three-dimensional ZIFs, which significantly affect their structure, morphology, and properties. Their transform structure is evidenced by integrated X-ray diffraction technique , Thermogravimetric analysis , Scanning electron microscope, and Fourier transform infrared spectroscopy . Moreover, the performance of greenhouse gas adsorption (CO 2 and CH 4 ) applications is affected by the transformation through the thermal activation of materials. Therefore, understanding the activated conditions that impact material synthesis is crucial to maximizing the potential applications of ZIFs in various fields. The 2D ZIF-L has more exposed external surfaces and open structures, which makes it more reactive towards adsorptive reactants, unlike the 3D ZIFs. The 3D ZIFs have a robust structure and a higher porosity framework that can withstand challenging application conditions. Thus, it's essential to ensure appropriate activation conditions to maintain the functional properties of ZIFs, which are crucial for their optimal performance in various applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiaodong Qian,Congling Shi,Mei Wan,Honglei Che,Junyi Li
To improve the interface interaction between MXene and the polymer matrix, CoNi-ZIFs were adopted to modify MXene through an in situ preparation method. The nanohybrid flame retardants were introduced into epoxy polymers (EPs) to improve the thermal stability, flame resistance, and smoke reduction capabilities of the EP nanocomposites. Based on the above design, the nanohybrid flame retardants exhibit excellent synergistic flame retardant effects. Compared with the MXene and CoNi-ZIF-based EP nanocomposites, the performance in terms of thermal stability, flame resistance, and smoke reduction capabilities of EP/CoNi-ZIF/MXene nanocomposites has been significantly improved. 2 wt % CoNi-ZIF/MXene in EP can improve the residual carbon content of nanocomposites to 18.78% at high temperature and reduce the peak heat release rate (pHRR) by 22.68%, and the release of the smoke production rate (SPR), CO, and CO2 for the nanocomposites is also inhibited simultaneously. The notable decrease in the fire risk of EP largely stems from the catalytic carbonization of transition metals and the synergistic and physical barrier effects of the CoNi-ZIF/MXene nanohybrids.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Xiaojun Zhao,Lijuan Liu,Weiting Yang,Qinhe Pan
The utilization of hydrogen energy is an effective way to alleviate the shortage of traditional energy, carbon emissions, and environmental pollution. As a hydrogen energy conversion device, fuel cells are severely limited by the slow oxygen reduction reaction on the cathode. Herein, we designed and synthesized the composite precursors of ZIF and chitosan, which was used for the preparation of a series of efficient carbon-based catalysts for oxygen reduction by pyrolysis. Among them, ZnCo-ZIF@CS-3-800 shows the best catalytic performance. Its onset potential and limited current density are nearly the same as those of Pt/C, and its half-wave potential is 9 mV higher than that of Pt/C. Moreover, it also exhibits excellent catalytic stability, durability, and methanol tolerance, promising great potential and prospects for application in fuel cells.
研究领域:
材料科学
·
能源科学
·
催化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xingxin Niu,Chengdeng Wang,Wenyuan Zhang,Donghua Wang,Haofeng Shi,Lu Yu,Chong Wang,Zhihao Xiong,Zhen Ji,Yan Gao,Xiaoqin Yan
The application of silicon-based anode remains a serious challenge due to its intrinsic volumetric expansion effect and low conductivity. In our work, a novel CNT-interspersed hierarchical carbon shell structure (denoted as PDA@CoZn-NC@Si) is synthesized by wrapping Si uniformly in the bimetallic zeolite imidazolate frameworks (ZIFs) and then encapsulated with a dopamine-derived carbon shell. The PDA@CoZn-NC@Si anode delivers better cycle stability of 814 mAh/g at 0.5C for 400 cycles (only −0.14% capacity reduction per cycle) and possesses excellent rate capability, which benefits from the inner porous buffer spaces, interspersed CNT, and solid heterogeneous carbon shells. In addition, the full cell is assembled by pairing a solution-based chemically prelithiated PDA@CoZn-NC@Si anode with a Li(Ni 1/3 Co 1/3 Mn 1/3 )O 2 (NCM111) cathode, and it presents an improved initial coulombic efficiency (88.3%) and a high energy density (419.8 Wh/kg). This study provides effective guidance for optimizing the microstructure design and prelithium of Si-based anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Minghong Fan,Zhiyu Gong,Jiayu Zheng,Lu Zhou,Beibei Qi,Tianzuo Liu,Zhengfei Yang
Unique nanostructures of bimetallic materials derived from zeolitic imidazolate frameworks (ZIFs) are promising candidates for electrochemical sensor applications. In this study, different bimetallic bar-shaped ZIFs (B-ZIFs) were synthesized by replacing some cobalt ions with different metals ions (Ni 2+ , Ce 2+ , Cu 2+ , Mn 2+ , or Fe 3+ ). Then their derivatives were prepared via carbonization, respectively. Upon conducting thorough material characterizations and assessment of the electrochemical properties, the most suitable candidate for electrode modification was identified as bar-shaped Co/Cu-based carbon materials (B-Co/Cu/Cs). This choice facilitated the construction of an innovative electrochemical sensor tailored for the determination of H 2 O 2 . The furnished B-Co/Cu/Cs-based sensor showed good linearity for H 2 O 2 analysis within concentrations ranged from 0.5-4000 μM and 4000–11000 μM, with a detection limit of 0.44 μM. All these results suggested that the prepared material would be a competitive candidate for the non-enzymatic H 2 O 2 sensing.
研究领域:
材料科学
·
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2024
·
IF 2.7
Zhiliang Guo,Helin Wang,Changgan Lai,Shuai Ji,Jian Sun,Donghuai Zhang,Liu Nie,Lixu Lei
In recent years, a variety of nanomaterial synthesis methods have been used to explore the preparation of metal–organic frameworks (MOFs). The zeolitic imidazolate frameworks (ZIFs), are typically synthesized through high cost and environmentally unfriendly solvothermal methods, require a large amount of organic solvents, and have extremely low yields. Therefore, exploring scalable and environmentally friendly synthesis routes for ZIFs is crucial. The metal oxide and 2-methylimidazole are completely converted into submicron size ZIFs in stoichiometric ratio via less solvent solid state reaction (LSR) method. The ZIFs synthesized by LSR method have good crystallinity, large specific surface area, and the use of tiny solvent amount can achieve a yield of nearly 100%, which solves the problems of low yield and serious waste of solvent in the synthesis of ZIFs by traditional methods. Additionally, the fabricated ZIFs derived materials through high-temperature pyrolysis have high specific surface area, nitrogen rich content, and excellent chemical stability, being favorable for promoting the adsorption of organic dyes. The adsorption capacity of ZIF-8 derived materials fabricated by the LSR method for organic dyes is significantly better than that of ZIF-67 and bimetallic ZIFs (BZIFs) derived materials. Compared with the traditional method, the LSR method is a green and scalable manner to synthesize submicron ZIFs materials, paving the way for the preparation of various ZIFs with different metal centers, and also providing a new strategy for the commercial production of ZIFs derived materials widely used in the environment protection.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Dan Zhang,Yu Fan,Gaojie Li,Wei Du,Runlong Li,Yiming Liu,Zhixuan Cheng,Jiaqiang Xu
A series of zeolitic imidazolate frameworks (ZIFs) were synthesized by a facile and environmental friendly biomimetic method. The textural properties of the ZIFs were characterized by PXRD, FESEM, TEM and FT-IR spectra. These results showed ZIF 90 having typical rhombic dodecahedron crystals with a diameter of 800–1200 nm. Furthermore, the presence of rich aldehyde groups is confirmed through chemical analysis. Gas-sensing tests of quartz crystal microbalance (QCM) transducers based on ZIFs were investigated. The results showed that ZIF-90 based sensors exhibited excellent sensing performance towards low concentration of acetone vapor, such as high sensitivity (the frequency shift was 95 Hz @ 1 ppm), fast response (the response/recovery time was 12 s/17 s, respectively) and good selectivity. On the basis of temperature-varying experimental method, a moderate adsorption enthalpy (the value of ΔH θ was −57.93 kJ/mol) was obtained, indicating the existence of weak and reversible chemisorption between ZIF-90 and acetone molecules. The value of adsorption enthalpy (ΔH = −60.10 kJ/mol) obtained from Density functional theory is in close agreement with the experimental results.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Ting Li,Yi Ren,Daowen Wu,Wenbin Zhang,Mengqi Shi,Chenghan Ji,Lu Lv,Ming Hua,Weiming Zhang
Polymer membranes for water treatment are constrained by the permeability-separation trade-off. Herein, two-dimensional (2D) zeolitic imidazolate frameworks (ZIFs) made of benzimidazole interconnected with Zn ions are used to create 2D Zn 2 (Bim) 4 molecular sieve nanosheets, which is explored as an asymmetric, thin-film composite (TFC) nanofiltration (NF) membrane for removing organic dyes and salts from water with a high water permeability under a low operating pressure (1 bar). The 2D Zn 2 (Bim) 4 TFC NF membrane is synthesized via ionic bonds between polycations and the peripheral hydroxy groups of 2D Zn 2 (Bim) 4 nanosheets, regulating the assembly of 2D Zn 2 (Bim) 4 to create a novel crack-free functional layer on top of a polyvinylidene fluoride (PVDF) ultrafiltration membrane. FESEM and XPS confirmed the presence of a polycations-regulated ultrathin functional layer with a thickness of ∼37 nm on the PVDF support. Benefiting from its structural feature, our 2D Zn 2 (Bim) 4 TFC NF membrane could achieve an ultra-high flux of ∼290 L/(m 2 ·h·bar) (5–10-fold higher than that of graphene-based membranes), good anti-fouling properties and high rejection rates (above 98%) for organic dyes. Moreover, the desalinization rate is 50–75%. That is, our membrane is endowed with NF capability, and its intrinsic ultrafiltration features (high water permeance, ultrafast, and energy-saving) are also well maintained.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）