Nanoscale
·
2017
·Vol. 9
·期 6
·2178-2187
·
IF 7.367
Xueqin Li,Changlong Hao,Bochong Tang,Yue Wang,Mei Liu,Yuanwei Wang,Yihua Zhu,Chenguang Lu,Zhiyong Tang
Due to their high specific surface area and good electric conductivity, nitrogen-doped porous carbons (NPCs) and carbon nanotubes (CNTs) have attracted much attention for electrochemical energy storage applications. In the present work, we firstly prepared MWCNT/ZIF-8 composites by decoration of zeolitic imidazolate frameworks (ZIF-8) onto the surface of multi-walled CNTs (MWCNTs), then obtained MWCNT/NPCs by the direct carbonization of MWCNT/ZIF-8. By controlling the reaction conditions, MWCNT/ZIF-8 with three different particle sizes were synthesized. The effect of NPCs size on capacitance performance has been evaluated in detail. The MWCNT/NPC with large-sized NPC (MWCNT/NPC-L) displayed the highest specific capacitance of 293.4 F g−1 at the scan rate of 5 mV s−1 and only lost 4.2% of capacitance after 10 000 cyclic voltammetry cycles, which was attributed to the hierarchically structured pores, N-doping and high electrical conductivity. The studies of symmetric two-electrode supercapacitor cells also confirmed MWCNT/NPC-L as efficient electrode materials that have good electrochemical performance, especially for high-rate applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Zhixin Zhang,Xinshu Luo,Bin Wang,Jingbo Zhang
To improve electron transport rate of perovskite solar cells, a ZIF-8-derived porous carbon skeleton layer is prepared by carbonizing the ZIF-8 thin film on conducting glass as the electron transport skeleton of a perovskite solar cell. Polyvinylpyrrolidone is added during the synthesis of ZIF-8 to reduce the particle size of ZIF-8 and decrease the carbonization temperature below 600 °C. The porous structure of ZIF-8 is mainly reserved at the optimized carbonization temperature. Then, TiO2 nanoparticles are deposited on the surface of a porous carbon skeleton to form an electron transport layer of a perovskite solar cell with the structure of FTO/ZIF-8-derived porous carbon layer/TiO2/perovskite/spiro-OMeTAD/Au. Because of the good conductivity of the ZIF-8-derived porous carbon skeleton, the photogenerated electron transport rate of the perovskite solar cell is increased. At the same time, the porous structure of the ZIF-8-derived carbon layer increases the contact area between the perovskite layer and the TiO2 layer to favor separation of photogenerated charges. Therefore, the light-to-electric conversion efficiency of the CH3NH3PbI3 perovskite solar cell is enhanced from 14.25% to 17.32%.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry B
·
2025
·
IF 5.7
Mengnan Chai,Shengqian Wang,Jiangshan Liu,Yufan Li,Yulun Liu,Yubao Li,Jidong Li
Self-powered piezoelectric materials can generate continuous electrical stimulation in response to weak mechanical forces, holding great potential for accelerating wound healing. Herein, a multifunctional ZIF-8/PVDF piezoelectric fiber dressing was fabricated using the electrospinning method for generating electrical stimulation to enhance the endogenous electric field at the wound site. The incorporation of ZIF-8 nanoparticles and the stretching polarization effect of electrospinning on the fibers promote the formation of the piezoelectric β-phase in PVDF, leading to enhanced piezoelectricity. The improved piezoelectric and conductive properties collectively enhance the output electrical signals of the fiber. The short-circuit voltage and open-circuit current of the 5% ZIF-8/PVDF fiber were 2.97 V and 13.7 nA, respectively, showing significant improvement compared to the pure PVDF fiber. In vitro experiments demonstrate that the fiber can generate reactive oxygen species (ROS) and release Zn2+ under ultrasonic conditions, which together with electrical stimulation endows the dressing with effective antibacterial, anti-inflammatory, and angiogenic effects. In vivo studies of infected skin defect models demonstrated that the ZIF-8/PVDF fiber dressing can significantly inhibit bacterial infection, regulate inflammatory responses, enhance angiogenesis, and ultimately accelerate the infected wound healing process. This developed multifunctional piezoelectric fiber dressing provides an effective strategy for infected wound repair.
研究领域:
材料科学
·
生物医学工程
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纳米技术
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高分子科学
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伤口修复
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生物电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xianyu Lei,Yang Cao,Qianlin Chen,Xianquan Ao,Yu Fang,Baojun Liu
Tetracycline hydrochloride (TC) is a broad-spectrum antibiotic extensively used in medical and veterinary fields. However, its excess harms the environment and human health. Recently, construction of CuO/ZnO heterojunctions has a very good effect in the treatment of organic matter in water. In this study, we used zeolite imidazolate framework (ZIF-8) as initial material to synthesize porous and hollow CuO/ZnO photocatalysts for catalytic degradation of TC. The results show that the synthesized CuO/ZnO has the characteristics of porous hollow polyhedron when the molar ratio of Cu and Zn is 0.1. Obviously, photocatalytic degradation rate was better comparing to CuO/ZnO nanoparticles as well as pure ZnO and CuO particles, respectively, which could reach 87% at 60 min under visible light (λ > 420 nm) and has good stability. Porous hollow CuO/ZnO composites are very promising for effective and environmentally friendly degradation of tetracycline hydrochloride in water.
研究领域:
环境科学
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材料科学
·
化学工程
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Zhaojie Wang,Xinle Sun,Qinglong Liu,Caifeng Xia,Qikang Yin,Siyuan Liu,Xiaoqing Lu,Hongyu Chen
Mixed matrix membranes (MMMs), which incorporate metal-organic frameworks (MOFs) nanofillers within a polymer matrix, offer a highly promising solution for CO2 capture and separation. However, poor interfacial compatibility and filler aggregation in MMMs pose significant challenges to enhancing CO2/N2 separation performance. Here, we present a novel approach using amino ionic liquid modification to optimize MMMs, where the modified AFIL promotes the formation of ZIF-8 with well-defined facets and sharp edges, and enhances the compatibility between ZIF-8 particles and PIM-1 polymer matrix for favorable CO2 affinity and selective CO2 transport. The resulting 10 wt.% AFIL@ZIF-8/PIM-1 exhibits exceptional gas separation performance with a CO2 permeability of 7864262.2 Barrer and a CO2/N2 selectivity of 29.661.96. More importantly, the incorporation of AFIL into the ZIF-8 pores significantly enhances the thermal stability and aging resistance of AFIL@ZIF-8/PIM-1 MMMs via structural support and hydrogen bonding interactions. This work provides a practical approach to developing hybrid membranes for CO2/N2 separation, showcasing improved overall performance and strong interfacial compatibility.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Jiaxi Yang,Dan Gao,Heng Zhang,Qun Yi
The efficient capture of carbon dioxide (CO 2 ) by porous ionic liquids (PILs) has become one of the important ways to deal with the greenhouse effect and enhance environmental protection. In order to enhance the CO 2 capture efficiency of PILs, 2 amino-functional ionic liquids (ILs) were synthesized in deionized water: tetraethylenepentamine-2-methylimidazole ([TEPA][MIm]) and diethylenetriamine-2-methylimidazole ([DETA][MIm]). 2 zeolite imidazolidin-8 frames (ZIF-8-W and ZIF-8-M) were prepared in methanol and deionized water. The performance of the material was verified through FT-IR infrared spectroscopy, TGA-DTG curves, XRD spectra, adsorption desorption curves, and corrosive changes. Based on this, the porous ionic liquid ZIF-8-W/[TEPA][MIm] with the best performance and ZIF-8-W with the best environmental friendliness were successfully constructed. The chemical reaction mechanism of CO 2 in PILs were explored. The results showed that the thermogravimetric temperature of all materials was greater than 370 K, and the difference in adsorption capacity between ZIF-8-W and ZIF-8-M was only about 36.3 ml/g, the maximum mass change rates of the two ILs after immersion in ceramic and stainless steel tubes for 7 days were only 0.78 % and 0.29 %, respectively. On the premise of ensuring fluidity, the maximum capture capacity of ZIF-8-W/[TEPA][MIm] for pure CO 2 reached 2.22 mol/mol PILs, and the maximum capture capacity for CO 2 in artificial flue gas reached 2.03 mol/mol PILs, which was 21.9 % and 31.6 % higher than the maximum capture capacity of pure ionic liquids, respectively. When [TEPA][MIm] in PILs reacts with CO 2 , it conforms to the characteristics of “zwitterions”.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Tengyang Zhu,Sheng Xu,Fen Yu,Xi Yu,Yan Wang
In this study, ZIF-8@GO composites with continuous inner channels for ethanol molecules were prepared by the in-situ growth of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles onto the surface of graphene oxide (GO) nanosheets , and filled into polydimethylsiloxane (PDMS) matrix to fabricate PDMS/ZIF-8@GO mixed matrix membranes (MMMs) for ethanol recovery via pervaporation . The as-prepared ZIF-8@GO composites and PDMS/ZIF-8@GO MMMs were characterized by various techniques. The results showed that ZIF-8 nanoparticles were uniformly dispersed on the surface of GO nanosheets and the hydrophobicity of ZIF-8@GO composites was stronger than GO due to the surface modification of GO by hydrophobic ZIF-8. Moreover, ZIF-8@GO composites as the filler not only exhibited the excellent compatibility with PDMS but also showed the good dispersion in PDMS matrix as compared to ZIF-8 nanoparticles. Therefore, ZIF-8@GO-based MMMs showed better separation performance than ZIF-8-based MMMs. The pervaporation performance of PDMS/ZIF-8@GO MMMs was studied by adjusting the filler type, particle loading, membrane thickness, and feed temperature. The optimized PDMS/ZIF-8@GO MMMs displayed a prominent separation factor of 22.2 with a total flux of 443.8 g/m 2 h with 5 wt% ethanol aqueous solution at 40 °C, and therefore the superior pervaporation performance to most other PDMS-based MMMs. The excellent pervaporation results were attributed to the synergistic effect of GO nanosheet as a strong barrier and hydrophobic ZIF-8 nanoparticles with the continuous inner channels. The synergistic effect of hybrid particles may provide valuable guidance to the development of high-performance PDMS-based MMMs for pervaporation recovery of various organic compounds.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Jianxin Liu,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
For detecting the active roles of ZIF-8 in composite photocatalyst , a novel Ag/AgCl/ZIF-8(50%) composite photocatalyst was designately prepared by anchoring Ag/AgCl nanoparticles on the surface of ZIF-8 with 50% content. The adsorption and photocatalytic performance of Ag/AgCl/ZIF-8(50%) were conducted by removal of Rhodamine B (RhB) from aqueous solution under dark and visible light irradiation (λ > 420 nm). The experimental results showed that the as-synthesized Ag/AgCl/ZIF-8(50%) exhibited higher photocatalytic activity than Ag/AgCl. The XRD , TEM , FTIR, DRS, VB XPS, ESR, N 2 adsorption isotherms and active species trapping experiments were used to characterize the performance of the composite photocatalyst. We found that the ZIF-8 in composite photocatalyst not only has the adsorption ability for RhB by its large specific area, but also has the ability for the formation of O 2 · − by an appropriate position of conduction band (CB). A reasonable reaction mechanism with a new perspective on the composite photocatalyst of Ag/AgCl/ZIF-8(50%) was proposed. This insight on the active roles of ZIF-8 in Ag/AgCl/ZIF-8(50%) may open a window for the use of MOF material in photocatalytic field.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Zhiqiang Shan,Hengzhong Fan,Qiao Tian,Xiaohua Jia,Haojie Song
The porous structure and flexible crystal deformation ability of ZIF-8 provide ideas for the preparation of new inorganic nano-lubrication additives. Herein, the polydopamine (PDA) armor was coated on ZIF-8 surface to prevent its decomposition in water. The abundant active groups on the ZIF-8 @PDA surface promoted its strong mechanical anchoring on the surface of graphene oxide (GO) and improved the dispersion stability of nano-components in pure water. The nanoparticles and GO fragments released under mechanical and thermal action repair the broken tribofilms, and the flexible deformation of ZIF-8 nanocrystals in friction interface leads to the dispersion of frictional energy, resulting in the greatly reduction of friction coefficient and wear scar width of engineering steel surface (reduced by 82% and 83%).
研究领域:
材料科学
·
纳米技术
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shuqi Zhang,Jing Yi,Xuanxuan Yuan,Zhilong Zhang,Zhongguo Shan,Haihua Wang
The development of environmentally friendly biodegradable films is urgently required for reducing the plastic pollution crisis and ensuring food safety. Thus, here we aimed to prepare ZIF-8 that has delivery ability for gallic acid (GA) and further incorporated this material (GA@ZIF-8) into carrageenan (CA) matrix to obtain a series of CA-GA@ZIF-8 films. This design significantly improved the mechanical strength and UV barrier and reduced water vapor permeability, moisture content , and swelling rate of the CA films. CA-GA@ZIF-8 films exhibited sustainable release of GA and controlled migration of Zn 2+ up to 144 h in a high-fat food simulator. Also, the composite films performed high-efficiency antioxidant activities (83.29 % for DPPH and 62.11 % for ABTS radical scavenging activity) and 99.51 % antimicrobial effects against Escherichia coli O157:H7 after 24 h. The great biocompatibility of GA@ZIF-8 and CA-GA@ZIF-8-10 % was confirmed by hemolysis, cell cytotoxicity, and mice model. Finally, the preservation experiments showed that CA-GA@ZIF-8 films could effectively maintain freshness and reduce the growth of microorganisms and oxidation of lipids during the preservation of beef. These results suggest that CA-GA@ZIF-8 films hold promising potential for improving the quality preservation of beef.
研究领域:
食品科学
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Yan Wang,Bo Ding,Qingqing Bao,Yunying Zhao,Guohui Li,Yu Deng
Agmatine is an important basic drug and nutritional supplements, which exhibits significant physiological activities. Traditional methods, such as whole-cell catalysis, require substantial pyridoxal 5′-phosphate (PLP) addition, which accounts for 15 % of production costs. In this study, we utilized purified arginine decarboxylase (AdiA-M2) that leverages the intrinsic PLP cofactor, without the need for additional PLP supplementation, and ZIF-8 was employed to enhance the pH tolerance. The successful incorporation of AdiA-M2 into the ZIF-8 structure was confirmed through scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). The immobilized arginine decarboxylase demonstrated markedly enhanced performance under alkaline conditions, along with improved thermal stability and storage activity compared to its free enzyme counterpart. Specifically, the immobilized AdiA@ZIF-8 system achieved an initial conversion rate of 95.16 %, after five recycles the titer attained 266.69 g/L without the extra PLP addition, which is 1.67 times higher than the best current production approach. The adopted enzyme-catalysis system eliminated the need for additional cofactors, thereby lowering costs and providing valuable insights for the industrial production of agmatine.
研究领域:
生物化学
·
酶工程
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lei Wang,Huaizhi Liu,Jianguo Zhao,Xiaojia Zhang,Chengzhi Zhang,Guanhua Zhang,Quanhui Liu,Huigao Duan
Lightweight, self-supporting, and flexible carbon nanofiber membranes are desirable electrode candidates for flexible supercapacitors. At present, inadequate electrical contact between adjacent nanofibers, poor wettability with electrolyte, and limited specific surface area are still challenges for further improving the capacitive property. In this work, a novel porous N-doped carbon nanofiber network membrane in which continuous ZIF-8-derived carbon layers “welding” adjacent carbon nanofibers is synthesized through bifunctional ZnO nanoparticles contained in the nanofibers. Here, ZnO nanoparticles not only serve as the pore-forming agent to create multiscale pores, but also provide zinc sources for in-situ growth of ZIF-8 nanoparticle layer. Because of highly interconnected networks, special spider-web-like surface nanostructure, and hierarchical pores, the as-prepared carbon membrane reveals superior electrical conductivity, high specific surface area and excellent wettability. An excellent rate performance with 75.5% capacitance retention even with 70-times current density increase and extraordinary cycling stability (98.8% capacitance retention after 100,000 cycles at 10 A g −1 ) could be found, when the optimized hierarchically porous N-doped welded carbon network membrane is used as the electrode. The quantitatively electrochemical kinetic analysis of the electrode indicates that fast double layer capacitive behavior is dominant at high current densities. Meanwhile, the flexible quasi-solid-state devices display excellent electrochemical stability in severely bending states.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）