NANOTECHNOLOGY
·
2024
·Vol. 35
·期 23
·235601
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IF 2.9
Miao Tang,Jintao Sun,Huang Naibao,Bin Wang,Xiaowen Ge,Wenjing Dong,Wanting Li,Xiannian Sun
Efficient and robust oxygen reduction reaction (ORR) catalysts are essential for the development of high-performance anion-exchange membrane fuel cells (AEMFC). To enhance the electrochemical performance of metal–organic frameworks of cobalt-based zeolite imidazolium skeleton (ZIF-67), this study reported a novel ZIF-67-4@CNT by in situ growing carbon nanotubes (CNTs) on the surface of ZIF-67 via a mild two-step pyrolysis/oxidation treatment. The electrochemical results showed that the as-prepared ZIF-67-4@CNT after CTAB modification exhibited excellent catalytic activity with good stability, with Eonset, E1/2, and Ilimit, respectively were 0.98 V (versus RHE), 0.87 V (versus RHE) and 6.04 mA cm−2@1600 rpm, and a current retention rate of about 94.21% after polarized at 0.80 V for 10 000 s, which were all superior to that of the commercial 20 wt% Pt/C. The excellent ORR catalytic performance was mainly attributed to the large amount of the in situ growing CNTs on the surface, encapsulated with a wide range of valence states of metallic cobalt.
研究领域:
材料科学
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电化学
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能源科学
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DOI
PubMed
高影响因子
INORGANICA CHIMICA ACTA
·
2024
·
IF 2.7
Xinfeng zhu,Tuo Wang,Jiawei Sun,Jiaxuan Li,Jingyu Wang,Junning Wang,Rongfu Peng,Zhengjie Li,Jingquan Liu,Libin Jiang,Kai Wang,Dandan Pang,Xueping Liu,Chaohai Wang,Jinhui Zhang
A series of ZIF-67-derived materials have been prepared by stirring and roasting ZIF-67 at different temperatures and used to activate persulfate for oxidation of tetracycline. Compared with Co 3 O 4 and common MOFs (MiL-100-Fe, UiO-66, and ZIF-67), ZIF-67-derived materials exhibit excellent catalytic activity. A 95.06 % removal has been achieved for 20 mg/L tetracycline at a catalyst dosage of 0.6 g/L, PMS dosage of 0.2 g/L. The N 2 adsorption/desorption experiment and the SEM analysis show that the large specific surface area favors the full contact between the active sites and the pollutants, and the regular pore structure is conducive to the diffusion and mass transfer of the pollutants. Moreover, XRD, Raman, and XPS studies demonstrate that a suitable calcination temperature can promote the formation of oxygen vacancies and active Co 2+ , essential for the formation of active oxygen species. The free radical scavenging experiment reveals that ·O 2 – is the main active species, followed by 1 O 2 . The effects of catalyst dosage, PMS dosage, initial pH, and coexisting ions on tetracycline oxidation are also investigated. Thus, this study provides the theoretical basis and practical evidence for activating PMS as a high-performance catalytic material for the degradation of antibiotics in water.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Chang Liu,Na Wu,Bin Li,Zhou Wang,Lili Wu,Zhihui Zeng,Jiurong Liu
Developing high-efficiency electromagnetic wave (EMW) absorbers by designing dielectric/magnetic components and microstructure in a straightforward, scalable method is highly desirable yet challenging. Here, we introduce a novel hierarchical composite aerogel-based EMW absorber composed of conductive carbon nanotubes (CNTs) and magnetic metal-organic framework (MOF) derivatives, integrated with sustainable cellulose nanofibers (CNF) derived carbon. This composite was prepared using a scalable freeze-casting followed by carbonization approach. Freeze casting enabled the creation of porous monoliths with high specific surface areas and customizable pore sizes and porosities, crucial for enhancing EMW reflection and scattering. Carbonization enhanced composite conductivity and stabilized the cobalt (Co)/carbon nanoparticles derived from ZIF-67 within the carbon matrix. CNF-derived carbon facilitated the efficient integration of ZIF-derived Co nanoparticles and CNTs, resulting in a robust 3D aerogel structure. The synergistic effects of CNT conductive paths and Co nanoparticles' magnetic losses provided an efficient route to enhance EMW absorption. Moreover, the creation of numerous heterogeneous interfaces augmented polarization losses, significantly enhancing EMW loss capability. Remarkably, the composite achieved outstanding EMW absorption, with a minimum reflection loss of -71.03 dB at a filling ratio of merely 10 wt.% and an effective absorption bandwidth of 4.64 GHz, comparable to leading EMW absorbers reported to date.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yu Liu,Shuai Yang,Xinyu You,Linlin Qin,Yiming Qin,Wenwen Zhang,Wenyan Liang
Electrocatalytic hydrogenation (ECH) has been used as a novel approach for the synthesis of organic compounds. Hence, ZIF-67 was selected as a precursor in this study to synthesize a series of electrodes. The ECH effects were assessed on pyridine and diazines. The results showed a significant influence of carbonization temperature and time on the electrocatalyst activity. A temperature of 400 °C was found not high enough for the synthesis of the electrocatalysts, and a long time of 4 h at 800 °C resulted in damage to the spatial structure of the electrocatalyst. The optimal electrocatalyst was obtained under 800 °C and 2 h (Co/NC-800–2). The polyhedral Co/NC-800–2 (20–200 nm) had the N-doped graphitic-carbon shell with embedded Co/CoN/Co 3 O 4 nanoparticles . The onset potential and overpotential (at 10 mA cm −2 ) were estimated to respectively 64 and 155 mV versus hydrogen evolution reaction (HER), with a Tafel value of 62 mV dec −1 . The ECH on pyridine and diazines revealed a positive correlation between ECH effect and HER activity. Co/NC-800–2 possessed excellent ECH activity toward pyridine and pyrazine at − 0.3 V (vs. RHE). N–Co, pyridinic-N, and graphitic-N acted as active sites during electrocatalysis . The N-doped graphitic-carbon promoted the charge transfer during ECH processes.
研究领域:
材料科学
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电化学
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催化反应
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chengjuan Wang,Haotian Jiang,Bowen Cui,Xiaodan Xu,Yanxiang Wang,Chengguo Wang
Rational design of multifunctional and high-performance electromagnetic wave (EMW) absorbers is highly desirable but still remains a challenge. Herein, the 3D heterostructural Co@carbon nanotubes/carbon fiber (Co@CNTs/CF) hybrids derived from ZIF-67/CF were successfully fabricated via the in-situ synthesis of ZIF-67 on CF and subsequent catalytic chemical vapour deposition. Intriguingly, the as-obtained composites acquire adjustable EMW absorption and favorable mechanical properties simultaneously. Specifically, taking advantage of adequate conductive paths, plentiful heterogeneous interfaces, suitable defect vacancies, appropriate magnetic loss, as well as optimized impedance matching, Co@CNTs/CF delivers a brilliant EMW absorption intensity of −45.11 dB at only 1.15 mm together with a broad effective absorption bandwidth (EAB) of 4.0 GHz (1.23 mm), and an unexpected minimal reflection loss up to −65.63 dB (3.84 GHz) coupled with an EAB of 3.6 GHz at merely 1.09 mm, respectively. In addition, the tunable EAB can be achieved in 2.6–18 GHz, covering 96 % of the test frequency by changing the absorber thickness from 0.93 to 5.0 mm (29 wt%). Moreover, the maximum radar cross section reduction can reach 48.8 dBm 2 . The uniform layer of CNTs with moderate crystallinity also enables Co@CNTs/CF to improve the tensile strength and Weibull modulus compared to unsized CF. This study paves a novel avenue for developing multifunctional materials based on CF through an efficient, controllable and low-cost approach.
研究领域:
材料科学
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电磁学
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复合材料工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
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IF 6.035
Xingyu Wu,Wei Liu,Hong Wu,Xue Zong,Leixin Yang,Yingzhen Wu,Yanxiong Ren,Chengyou Shi,Shaofei Wang,Zhongyi Jiang
In this study, novel kinds of MMMs were fabricated by incorporating ZIF-67 nanoparticles into polymers of intrinsic microporosity (PIM-1). ZIF-67 (Co substituted ZIF-8) displays stiffer Co-N bond as compared with the Zn-N bond in ZIF-8, which might led to the slightly smaller effective pore aperture of ZIF-67. Good compatibility between ZIF-67 nanoparticles and PIM-1 matrix rendered ideal interfacial morphology. The intrinsic separation performance of ZIF-67 was estimated from our experimental separation results based on the Maxwell model. The calculation demonstrated its superior CO 2 /CH 4 selectivity of 45, which is twice compared with that of ZIF-8, supporting the high molecular sieving efficiency of PIM-1/ZIF-67 MMMs. Particularly, the CO 2 and H 2 permeability increased by 15.1% and 59.6% for PIM-1 membrane with 20 wt% ZIF-67 loading, meanwhile CO 2 /CH 4 and H 2 /CH 4 selectivity increased by 34.4% and 86.96%, respectively. The strategy of incorporating highly selective ZIFs into polymers of intrinsic microporosity may have promising potential in fabricating high performance membranes for efficient gas separation.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 7
·18364-18379
·
IF 5.19
Zhang Xiao,Li Zhiyue,Zhang Taoyi,Chen Jing,Ji Wenxi,Wei Yun
A low-cost and environmental-friendly sodium alginate-melamine@zeolitic imidazolate framework-67 (SA-ME@ZIF-67) adsorbent was fabricated by chemical grafting and in situ growth for the removal of lead ions in wastewater. Firstly, melamine (ME) was grafted onto sodium alginate (SA) by amide reaction, and then SA-ME was dropped into a solution of calcium chloride to form hydrogel bead, and ZIF-67 was grown on the SA-ME hydrogel bead by the in situ growth method. The SA-ME@ZIF-67 adsorbent was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The SA-ME@ZIF-67 adsorbent was used to effectively adsorb Pb(II) from aqueous solutions. The initial concentrations of lead ions, adsorbent dose, initial pH of lead ion solution, temperature, and adsorption time for the material were optimized. The adsorption isotherms and kinetics fitted to Langmuir isotherm model ( R 2 = 0.9281, 0.9420, and 0.9623 at the temperatures of 288.15 K, 298.15 K, and 308.15 K, respectively) and pseudo-second-order kinetic model ( R 2 = 0.9901) respectively. According to the Langmuir model at 308.15 K, the maximum adsorption capacity of the adsorbent for Pb(II) was 634.99 mg/g. The recycling application of the adsorbent was possible as it was easily collected and reused after five adsorption-regeneration cycles. In addition, the Pb(II) in real wastewater samples has been efficiently removed using the fabricated hydrogel. The results showed that the SA-ME@ZIF-67 adsorbent had high adsorption capacity, removal efficiency, and easy recyclability for Pb(II). Graphical abstract
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2020
·
IF 4.231
Zhenguo Gao,Jiaoqiang Zhang,Shijie Zhang,Di Lan,Zehao Zhao,Kaichang Kou
Given the remarkable performances of metal frame works (MOFs) and ferrocene containing polymers (FCPs) in electronic devices, the research on integration of structure and function for collaborative optimization of electromagnetic wave (EMW) absorption are still missing. Herein, surface grafting and main chain polymerization methods have been employed on the FCPs modifying zeolitic imidazolate framework-67 (ZIF-67) respectively. Polydopamine-coated ZIF-67 was precursor for grafting type products (ZIF-67@PDA-Fc), while poly (vinyl ferrocene) was for main-chain type products (ZIF-67@PVF). Furthermore, the calcined products, polyhedron capsules structured Co 3 O 4 @C@α-Fe 2 O 3 and Co 3 O 4 /α-Fe 2 O 3 @C microwave absorbers were obtained from ZIF-67@PDA-Fc and ZIF-67@PVF for higher performance EMW absorption. The crystal, morphological and chemical structure was detected via XRD , SEM, TEM, FTIR, Raman, XPS techniques. The EMW absorbability was calculated according to transmission line theory. In particular, the minimum reflection loss (RL min ) of Co 3 O 4 @C@α-Fe 2 O 3 reached −52.2 dB at the thickness of 3.7 mm with effective absorption band ( f E ) 4.4 GHz. It is worth emphasized that the broadest f E was 6.6 GHz obtained at 2.5 mm with RL min reaching −38.4 dB. Additionally, the EMW absorption mechanism was also studied based on the dielectric and magnetic properties . This investigation will push forward further research and practical application of metal organic compounds-based composites.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Biosensors-Basel
·
2024
·Vol. 14
·期 1
·38
·
IF 4.9
Qiaolin Fan,Xiao Li,Hui Dong,Zhonghua Ni,Tao Hu
Graphene and graphene-like two-dimensional layered nanomaterials-based photoelectrochemical (PEC) biosensors have recently grown rapidly in popularity thanks to their advantages of high sensitivity and low background signal, which have attracted tremendous attention in ultrahigh sensitive small molecule detection. This work proposes a non-enzymatic and visible-light-sensitive PEC biosensing platform based on ZIF-67@MoS2/rGO composite which is synthesized through a facile and one-step microwave-assisted hydrothermal method. The combination of MoS2and rGO could construct van der Waals heterostructures, which not only act as visible-light-active nanomaterials, but facilitate charge carriers transfer between the photoelectrode and glassy carbon electrode (GCE). ZIF-67 anchored on MoS2/rGO heterostructures provides large specific surface areas and a high proportion of catalytic sites, which cooperate with MoS2nanosheets, realizing rapid and efficient enzyme-free electrocatalytic oxidation of glucose. The ZIF-67@MoS2/rGO-modified GCE can realize the rapid and sensitive detection of glucose at low detection voltage, which exhibits a high sensitivity of 12.62 μAmM−1cm−2. Finally, the ZIF-67@MoS2/rGO PEC biosensor is developed by integrating the ZIF-67@MoS2/rGO with a screen-printed electrode (SPE), which exhibits a high sensitivity of 3.479 μAmM−1cm−2and a low detection limit of 1.39 μM. The biosensor’s selectivity, stability, and repeatability are systematically investigated, and its practicability is evaluated by detecting clinical serum samples.Keywords:ZIF-67;2D material;non-enzymatic;heterostructure;visible-light sensitive;photoelectrochemical biosensing
研究领域:
生物医学工程
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纳米技术
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分析化学
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产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2025
·
IF 11
Zhao Zhi-Hua,Ma Shi-Xin,Pan Ya-Fang,Rahmatullah Abu-Bakker-Md,Shen Xiao-Qing,Shao Zhi-Gang,Wu Lan
To facilitate real-time monitoring and recording of humidity in the environment and to satisfy the requirement for strain performance in certain applications (such as wearable devices), this paper proposes an in-situ method for synthesising Au nanoparticles on ZIF-67. In this study, an Au@ZIF-67 composite humidity-sensitive material was combined with flexible polyethylene terephthalate interdigitated electrodes to create an Au@ZIF-67 flexible humidity sensor. The prepared samples were characterised using X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The humidity-sensitive properties of the sensor were investigated, and its monitoring capabilities in applications involving respiration, gestures, skin, and baby diapers were tested. The experimental results indicate that compared with a pure ZIF-67 humidity sensor, the Au@ZIF-67 (0.1Au@Z) flexible humidity sensor exhibits a 158.07% decrease in baseline resistance and a 51.66% increase in sensitivity to 95% relative humidity, and the hysteresis, response time, and recovery time are significantly reduced. Furthermore, the sensor exhibits excellent characteristics such as high resolution, repeatability, and stability. The obtained results regarding the material properties, humidity sensitivity, and practical application of non-contact humidity monitoring demonstrate that the prepared sensors exhibit excellent and comprehensive performance, indicating their broad prospects in wearable medical devices, wireless Internet of Things, humidity detection in complex environments, and intelligent integrated systems. Graphical abstract
研究领域:
材料科学
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生物医学工程
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传感器技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Ying-Hua Zhou,Xingyun Cao,Jingzhu Ning,Changchun Ji,Yong Cheng,Jing Gu
To exploit the low-cost and efficient catalyst for the hydrolytic dehydrogenation of ammonia borane , trace amount of palladium-doped transition metal (Cu, Ni, Co, Fe and Zn) nanoparticles have been incorporated into the interior of metal-organic frameworks named ZIF-8, ZIF-67, ZIF-67/ZIF-8 and core-shell ZIF-67@ZIF-8 by a double-solvent approach. The optimized catalyst of CuPd 0.01 @ZIF-67@ZIF-8 composite exhibited an excellent activity with a turnover frequency (TOF) value of 30.15 mol H 2 (mol metal ) −1 min −1 at 298 K and a relatively low activation energy of 38.78 kJ mol −1 . It might attributed to both ultrafine size of metal nanoparticles (~3 nm) induced by the confinement of core-shell ZIF-67@ZIF-8 and the synergistic effect between Pd and Cu. Moreover, the detailed kinetic study has manifested that this catalytic reaction is first-order in regards to the catalyst amount while zero-order as for the concentration of ammonia borane. In addition, the durability and recyclability of CuPd 0.01 @ZIF-67@ZIF-8 have been demonstrated to be great.
研究领域:
材料科学
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化学工程
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能源技术
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产品关联
DOI
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
研究领域:
材料科学
·
分析化学
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医学检测
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）