NANOTECHNOLOGY
·
2022
·Vol. 33
·期 42
·425601
·
IF 3.953
Wenwu Jiang,Yi Han,Yanhuai Ding
Electrospun PAN/PVdF-HFP membranes have the potential to be used as separators for Li-ion batteries owing to their good mechanical properties and high chemical stability. However, the application of PAN/PVdF-HFP separators has been hampered by their poor electrochemical performances. In this study, semi-aligned PAN/PVdF-HFP nanofiber separators have been fabricated by an electrospinning technology. Sepiolite and ZIF-67 co-modification was employed to enhance the physical properties of the PAN/PVdF-HFP separators. The test cells with the as-prepared composite separator showed better electrochemical performance than the commercial and raw PAN/PVdF-HFP separators.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yujia Yuan,Zhongliang Huang,Siyuan Hu,Dongren Cai,Guowu Zhan
In the field of catalysis, nanoreactors with spatially restricted effects play a critical role to enhance the production efficiency of a variety of reactions. In this contribution, we used ZIF-67 nanocubes (size of 140 nm) as a template and conformally deposited Al2O3 thin films by the atomic layer deposition (ALD) technique, wherein Pt nanoparticles (Pt NPs) as active sites were loaded on either the inside or outside of the Al2O3 films. Notably, it was found that the water treatment of the nanoreactors was critical to the enhanced catalytic CO oxidation performance with substantially decreased T100 (temperature to achieve 100% conversion). Various characterization results indicated the successful synthesis of yolk–shell structured ZIF-67/Pt@10Al2O3-W catalyst with excellent CO oxidation activity and good long-term stability. In addition, in situ diffuse reflectance infrared Fourier transform spectroscopy was used to explore the catalytic oxidation process, and the results revealed that the reason for the superior CO catalytic activity of the designed nanoreactors was ascribed to the moderate CO surface coverage provided by the Al2O3 films and the activated oxygen species. In summary, this work provides some insights into the preparation of metal–organic framework-based nanoreactors using ALD-assisted methods.
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高影响因子
Polymers
·
2021
·Vol. 13
·期 23
·4210
·
IF 4.329
Bingyi Ma,Xin Zhang,Xiaoqian Deng,Sheng Huang,Min Xiao,Shuanjin Wang,Dongmei Han,Yuezhong Meng
Lithium–sulfur batteries (LSBs) have attracted wide attention, but the shuttle effect of polysulfide hinders their further practical application. Herein, we develop a new strategy to construct a Ketjen black@zeolite imidazole framework-8/polypropylene composite separator. Such a separator consists of Ketjen black (KB), zeolite imidazole framework-8 (ZIF-8) and polypropylene (PP) with a low coating load of 0.06 mg cm−2and is denoted as KB@ZIF-8/PP. KB@ZIF-8/PP can absorb polysulfides because of the Lewis acid-base interaction between ZIF-8 and polysulfides. This interaction can reduce the dissolution of polysulfides and suppress the shuttle effect, thereby enhancing the electrochemical performance of the battery. When tested at a current density of 0.1 C, an LSB with a KB@ZIF-8/PP separator exhibits low polarization and achieves a high initial capacity of 1235.6 mAh/g and a high capacity retention rate of 59.27% after 100 cycles.Keywords:lithium–sulfur battery;separator;shuttle effect;metal-organic framework;chemisorption
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chengyuan Duan,Meili Ding,Yi Feng,Mengjue Cao,Jianfeng Yao
Integration of Lewis acid and base sites and oxygen surface groups in one catalyst is favorable to promote CO 2 cycloaddition reaction. Here, Zn-ZIF-L was used as starting material to design one kind of catalyst with multiple active sites via pyrolysis and oxidization treatment. The well-dispersed ZnO nanoparticles and pyridinic nitrogen in nitrogen-doped carbon serve as Lewis acid and base sites to activate epoxide and CO 2 while oxygen surface groups help promote the ring-opening reaction of epoxides. Results show that Zn-ZIF-L derived catalyst displays high catalytic activities for CO 2 cycloaddition (6 h, 83% of yield) under mild conditions (70 °C and 0.1 MPa CO 2 ) and outperforms ZIF-8 derived catalyst. Moreover, the obtained catalyst also achieves a satisfactory photothermal catalysis of cycloaddition reaction under light irradiation (120 mW/cm 2 ), which makes our sample a promising catalyst for CO 2 conversion.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Xin Yan,Yiyuan Yao,Hao Zhang,Jia Xie,Chengming Xiao,Shuai Zhang,Junwen Qi,Xiuyun Sun,Jiansheng Li
Well dispersed nanocatalysts on porous substrate with macroscopic morphology are highly desired for the application of heterogeneous catalysis. Traditional fabrication process suffers from multiple steps for controlling the structure on nanocatalysts and matrix or both. Herein, we report a facile strategy for the synthesis of millimeter-sized hierarchical porous carbon beads (HPCBs) which containing well dispersed hollow-nano carbon boxes for peroxymonosulfate catalysis. Specially, the precursors of HPCBs were prepared by phase inversion method, which involving introduction of zeolitic imidazolate framework (ZIF-8) nanocubes into polyacrylonitrile (PAN) solutions followed by solidification of the mixture. After pyrolysis , nitrogen doped and hierarchical porous HPCBs with diameter of about 1.2 mm were obtained. The merits of our synthesis strategy lie in that synchronizes the hollow microstructure evolution with the shaping of ZIF-8 nanocubes into millimeter scale beads. Attribute to its special structure feature and the appropriate chemical composition, the resultant millimeter-sized HPCBs exhibit enhanced catalytic performance by activation of peroxymonosulfate (PMS) for tetracycline degradation . The degradation efficiency of TC is up to 85.1% within 120 min, which is 18% higher than that of ZIF8-Solid/PAN carbon bead (SPCBs). In addition, the possible decomposition pathways, main reactive oxygen species , and reasonable enhanced mechanism for the HPCBs/PMS system are systematically investigated by quenching experiments, electron paramagnetic resonance (EPR) and liquid chromatography-mass spectrometry (LC-MS). This work addresses the issue of easy aggregation and recycling of carbon materials in industrial productions and extends the prospects of carbon materials in engineering applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ao-Shuai Zhang,Shen-Hui Li,Li-Hao Xu,Heng Mao,Zhi-Ping Zhao
Mixed matrix membranes (MMMs) filled with dispersed nanoparticles may not favor all requirements for high separation performances due to the discontinuity in molecular permeation pathways. Here, we reported polydimethylsiloxane (PDMS) based MMMs by incorporating one-dimensional (1D) ZIF-8 tubes for the pervaporation (PV) recovery of ethyl acetate (EtOAc) from its diluted aqueous solution. The 1D ZIF-8 is a tubular structure formed by the ZIF-8 crystal particles inlaying each other, some windows between the ZIF-8 crystal particles are seamlessly connected, so that the cavities of the ZIF-8 are connected through the windows. The ZIF-8 tubes not merely possess microporous and molecular sieving properties, but also are inherently continuous in the integral morphology. The morphological continuity renders docking micropores along the tube body, which can act as efficient molecular permselective pathways for EtOAc molecules. Both the short and long-sized ZIF-8 tubes (STZIF-8 and LTZIF-8) played greater roles in facilitating PV performances than that of dispersed nanoparticles. Importantly, the most remarkable effect of the LTZIF-8 on separation performance was obtained since their micron-sized continuous structure, connected cavities and lumen, is more conductive to the separation process. The MMMs with 8% loading of the LTZIF-8 exhibited superior separation factor of 591.9 and EtOAc flux of 0.82 kg·m −2 ·h −1 for separating 1 wt% feed solution at 30 °C, which are 3.11 and 3.45 times of that of PDMS membrane, respectively. This study may give inspiration for developing high-performance MMMs by incorporating such morphologically continuous, microstructurally porous and molecular sieving fillers as permselective pathways for guest molecules.
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高影响因子
FUEL
·
2021
·
IF 6.609
Xianglei Liu,Zekai Mu,Chen Sun,Hang Shi,Xianguang Meng,Ping Li,Yueyue Ling,Bo Cheng,Yimin Xuan,Yulong Ding
Solar-driven CO 2 reduction by CH 4 is promising to simultaneously tackle energy shortage and global warming problems by converting two greenhouse gases into fuels. However, serious challenges remain, such as limited light-to-fuel efficiency, high operating temperature, and severe catalyst deactivation. Here, high-performance direct solar-driven CO 2 reduction is demonstrated at relatively low operation temperature (594 °C) based on NiCo-ZIF derived nanostructures. An ultrahigh light-to-fuel efficiency of 32.4% and production rates of H 2 (105.83 min −1 g −1 ) and CO (128.17 mmol min −1 g −1 ) are achieved via photothermocatalysis on Ni 1 Co 2 @C ZIF -Al 2 O 3 catalysts. Excellent light-to-fuel conversion performance can be attributed to the highly dispersed metal particles, decreased apparent activation energy under direct light illumination, increased CO 2 absorption, and promoted dissociation of CH 4 to CH 3 * of NiCo alloy. The carbon deposition rate of NiCo bimetallic catalysts is prominently inhibited compared with pure Ni or Co catalysts due to the change of the reaction path, as confirmed by DFT calculations. This work opens new routes to achieve highly efficient solar-driven CO 2 reduction by CH 4 based on NiCo-ZIF derived alloy nanostructures at relatively low-temperature conditions.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Zhentong Han,Yaxin Zhao,Haoji Jiang,Ao Sheng,Hao Li,Hao Jia,Zhiyuan Yun,Zhong Wei,Heyun Wang
The present study eliminated nonselective defects by amending the MOF-based mixed matrix membrane (MMM) interface with (3-aminopropyl) triethoxysilane (APTES) via Schiff’s base reaction. This modification on the ZIF-90 nanoparticle surfaces enhanced the polydimethylsiloxane (PDMS) matrix interaction in the MMMs. Interfacial defects were then minimized through APTES-ZIF-90 nanoparticle surface alkoxy and PDMS chain hydroxyl group cross-linking. Enhanced chemical interactions between the nanoparticles and the polymeric matrix in the APTES-ZIF-90/PDMS MMMs resulted in higher interface compatibility and separation performance than the ZIF-90 nanoparticle MMMs, which ultimately improved its ethanol affinity and hydrophobicity. When the load of APTES-ZIF-90 nanoparticles was 15% and the temperature was 40 °C, the pervaporation performance of APTES-ZIF-90/PDMS MMMs was optimal, the separation factor was 16.8, and the permeation flux was 223 g/(m2·h). Compared with pure PDMS, the separation factor and permeation flux increased by 91 and 67%, respectively. In addition, stable APTES-ZIF-90/PDMS MMM pervaporation performance was observed after an optimal operation time of 120 h. Overall, the present work presented methods to optimize MOF-based MMMs for enhanced interface morphology and separation performance for ethanol recovery.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Yichen Zhou,Jianhao Qiu,Meili Ding,Xiong-Fei Zhang,Jianfeng Yao
Zeolitic imidazolate framework-8 (ZIF-8) crystals were obtained by an electric current-assisted synthesis method with stoichiometric Zn 2+ and 2-methylimidazole precursors. The resulting ZIF-8-CS2 shows enhanced CO 2 adsorption performance (31.2 cm 3 /g) with CO 2 /N 2 selectivity of 9 at 273 K, while ZIF-8 prepared without electric current assistance shows CO 2 adsorption of 18.4 cm 3 /g and CO 2 /N 2 selectivity of 5. The increased CO 2 adsorption ability is ascribed to the high specific surface area and total pore volume of ZIF-8-CS2.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qiongguang Li,Yanhong Wang,Xingyue Gao,Huifang Li,Qiangqiang Tan,Ziyi Zhong,Fabing Su
It is urgent to develop novel anode materials with high energy density and facile synthetic procedures, since the development of commercial lithium ions batteries (LIBs) is limited by the unsatisfied capacity of graphite. Herein, we propose a modified method to prepare core-shell structured ZIF-8 derived N-doped carbon/silicon (Si@NC) composites (6.6 wt% of nano-Si), featuring facile synthetic procedures and mild condition. The physicochemical properties of the ZIF-8 derived N-doped carbon are not changed when the nano-Si particles are employed as the seeds. The Si@NC composites deliver high reversible capacity of 724 mAh g −1 . Attributed to the good charge conductivity and structural stability of the ZIF-8 derived N-doped carbon, the Si@NC composites exhibit good rate performance (98.5% of the initial average capacity is retained after being cycled at different current density) and cycle stability (302 mAh g −1 while that of commercial graphite is ~10 mAh g −1 at 1000 mA g −1 after 800 cycles). The enhancement of lithium storage capability of the ZIF-8 derived N-doped carbon shows promising application in high energy density LIBs.
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高影响因子
RARE METALS
·
2021
·Vol. 41
·期 1
·189-198
·
IF 4.003
Tang Jing,Hui Zhen-Zhen,Hu Tao,Cheng Xin,Guo Jia-Hao,Li Zi-Rong,Yu Hao
The composite of zeolitic imidazolate frameworks (ZIF-67) and ordered macroporous carbon (OMC) was successfully synthesized via in situ growth from the OMC matrix. The ZIF67–OMC composite was verified by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS) and then evaluated as a modified material for electrochemical sensor. Benefitting from the large surface area and enhanced conductivity of the ZIF67–OMC composite, ZIF67–OMC nanocomposite showed superior electrocatalytic performance toward acetaminophen (AP) oxidation. The redox reaction of AP underwent a quasi-reversible redox reaction with higher anodic current at ZIF67–OMC modified electrode compared with the bare glassy carbon electrode (GCE). In optimal condition, the ZIF67–OMC/GCE was stable, reproducible and had a linear range of 0.05–100 μmol·L −1 AP concentration, with the detection limit of 20 nmol·L −1 (signal-to-noise of S / N = 3). In addition, the prepared sensing platform for the detection of AP was evaluated for the compound paracetamol tablets and urine samples. Graphic abstract
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 7
·077517
·
IF 4.316
Ziyu Zhao,Jialun Luo,Simon Tricard,Jihua Zhao,Qiangming Wang,Jian Fang
The development of effective and accurate catechol (CC) electrochemical sensors is critical for environment and life health perspectives. A facile pyrolysis of 2D bimetallic (Zn/Co) zeolitic imidazolate framework (Zn/Co-ZIF-L) was employed to prepare Zn and Co nanoparticles encapsulated in N-doped porous carbon (Zn/Co@NPC). Prussian blue (PB) was synthesized in situ via the co-precipitation of ferricyanide ([Fe(CN)6]3−) and iron (II) ion originated from the reduction of Fe3+ by Zn/Co@NPC and then served as the main active substance of CC detection. The morphology and composition of the final composite Zn/Co@NPC-PB were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD). The Zn/Co@NPC-PB modified glass carbon electrode (GCE) exhibits two concentration linear ranges of 4.13 μM − 1.08 mM (R2 = 0.999) and 1.08 mM−11.82 mM (R2 = 0.999) for CC electrochemical detection with a limit of detection 1.05 μM (S/N = 3). At the same time, the Zn/Co@NPC-PB/GCE shows great selectivity to electrochemical oxidation behavior of CC in presence of 20 folds dihydroxybenzene interferents such as hydroquinone and resorcinol. Furthermore, it showed a long-term stability and near 100% recovery for the detection of a real sample in Yellow River water.
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高影响因子
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