Nanomaterials
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2021
·Vol. 11
·期 10
·2491
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IF 5.076
Ruiying Wang,Mengran Lou,Jie Zhang,Zhipeng Sun,Zhiqian Li,Pengtao Wen
It is of prime importance to develop anode electrocatalysts for direct methanol fuel cells (DMFCs) with good performance, which is critical for their commercial applications. Metal-organic framework (MOF)-derived carbon materials are extensively developed as supports of catalysts. Herein, Co embedded nitrogen-doped carbon nanotube hollow porous carbon (Co-NCNT-HPC) derived from MOFs have been fabricated, which were synthesized by pyrolyzing at an optimized temperature of 800 °C using ZIF-8@ZIF-67 as a precursor. The presence of ZIF-8@ZIF-67 ensures the doping of nitrogen and the large specific surface area of the support materials at high temperatures. A Pt/Co-NCNT-HPC800 sample, which was synthesized using Co-NCNT-HPC800 as a support, showed an enhanced mass activity of 416.2 mA mg−1Ptfor methanol oxidation reaction (MOR), and the onset potential of COadoxidation of 0.51 V, which shifted negatively about 0.13 V compared with Pt/C (20%). Moreover, the Pt/Co-NCNT-HPC800 sample exhibits high stability. This work provides a facile strategy for MOF-derived carbon materials to construct advanced electrocatalysts for MOR.Keywords:metal-organic frameworks;N-doped carbon nanotube;hollow porous carbon;Pt-based catalysts;direct methanol fuel cells
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Weibin Chen,Changshui Wang,Shibiao Su,Hai Wang,Dandan Cai
The quest for desirable two-dimensional (2D) materials and facile strategies to construct 2D layered composites with fascinating structures and compositions for high-performance electrocatalysis is still a major challenge. In the present research, novel nanocomposites of 2D zeolitic imidazolate framework-9 (ZIF-9) combined with Co-layered double hydroxide (Co LDH) were successfully synthetized through a controllable phase transition from ZIF-9(I). The 3D to 2D structural transformation of ZIF-9 was induced by deionized water, and the formation of 2D Co LDH was simultaneously realized during the one-step fabrication of ZIF-9(III)/Co LDH nanocomposites. Due to the high surface area, the presence of abundant metal sites, and the interactions between 2D ZIF-9(III) and 2D Co LDH, the as-optimized ZIF-9(III)/Co LDH nanocomposite exhibits great electrochemical activities for oxygen evolution reaction (OER) (η = 297 mV at 10 mA cm −2 ) in 1.0 M KOH solution. The electrochemical performance of the ZIF-9(III)/Co LDH nanocomposite was superior to those of the pure Co LDH, ZIF-9(III), and commercial RuO 2 . The present work demonstrates that the proposed strategy can effectively boost catalytic activities and also design new routes to synthesize advanced MOF nanohybrids for various applications.
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Exploration
·
2024
·
IF 0
Qi Gao,Jian Gan,Pixiang Wang,Yuxiang Huang,Daihui Zhang,Wenji Yu
Air pollution is caused by the perilous accumulation of particulate matter (PM) and harmful gas molecules of different sizes. There is an urgent need to develop highly efficient air filtration systems capable of removing particles with a wide size distribution. However, the efficiency of current air filters is compromised by controlling their hierarchical pore size. Inspired by the graded filtration mechanisms in the human respiratory system, microporous ZIF-67 is in situ synthesized on a 3D interconnected network of bamboo cellulose fibers (BCFs) to fabricate a multiscale porous filter with a comprehensive pore size distribution. The macropores between the BCFs, mesopores formed by the BCF microfibers, and micropores within the ZIF-67 synergistically facilitate the removal of particulates of different sizes. The filtration capabilities of PM2.5 and PM0.3 could reach 99.3% and 98.6%, respectively, whereas the adsorption of formaldehyde is 88.7% within 30 min. In addition, the filter exhibits excellent antibacterial properties (99.9%), biodegradability (80.1% degradation after 14 days), thermal stability, and skin-friendly properties (0 irritation). This study may inspire the research of using natural features of renewable resources to design high-performance air-filtration materials for various applications.
研究领域:
材料科学
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环境工程
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化学工程
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生物医学
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
·
IF 3.9
Chunying Liu,Li Lv,Kun Liu,Junsu Jin,Jianguo Mi,Yongqiang Ren,Shisen Xu
By coupling CALF-20 on ZIF-7 via in situ crystallization in the confined micrometer-sized pores of poly(acrylates), a novel composite, namely, CALF-20-on-ZIF-7@poly(acrylates), has been synthesized for the simultaneous removal of CO2 and H2S from IGCC feed gas. Within this coupled crystal, CALF-20, known for its strong adsorption capacity and excellent stability toward CO2 and H2S, serves as the outer layer crystal to shift the adsorption/desorption hysteresis loop of inner ZIF-7 to beyond atmosphere pressure. Under high pressure, CO2 and H2S are automatically adsorbed. Upon reducing the pressure to the atmospheric level, CO2 is automatically released, while H2S remains temporarily due to its high adsorption energy. After about 150 cycles of CO2 adsorption/desorption of the kilogram-scale composite, H2S approaches saturation and is then removed by vacuuming. Since the content of H2S in IGCC feed gas is trivial, the total energy consumption for the composite regeneration is 0.16 MJ/kg (CO2). After 600 consecutive cycles, the CO2 adsorption capability of the composite decreases by 0.41%, demonstrating excellent cyclic stability.
研究领域:
化学工程
·
环境科学
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高影响因子
FOOD CHEMISTRY
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2025
·
IF 9.8
Chen Yuan,Fei Yang,Jiamin Wang,Kun Qian,Yu He,Junping Wang
The substantial presence of tetracyclines (TCs) and their resistant degradation properties have rendered them prevalent residues in animal-sourced foods. This paper introduced a novel metal-organic framework (AuNCs@ZIF-8@CDs@ZIF-8) that encapsulated carbon dots (CDs) and gold nanoclusters (AuNCs). This framework synergistically combined fluorescence emission with the porous characteristics of multi-shell metal-organic frameworks, facilitating the development of sensors and adsorbents specifically designed for tetracycline antibiotics. The fluorescence intensity ratio (F 0 /F) showed a good linear relationship with the concentration of TCs in the range of 0–100 μmolL −1 , with a detection limit of 0.0903 μmolL −1 . Additionally, AuNCs@ZIF-8@CDs@ZIF-8@SA/CMC hydrogel sensors were constructed and visualized for TC detection using a smartphone. The hydrogel demonstrated a TC loading capacity as high as 551.137 mg/g. The research provided a new strategy for developing the integrated technology of quantitative detection, rapid visualization detection, and adsorption removal of pollutant residues in food.
研究领域:
食品科学与技术
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分析化学
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环境监测
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纳米材料
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传感器与生物传感器
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiangdong Zhang,Jian Zhang,Bowen Hou,Xueying Yang,Junlian Ren,Chen Shao
Selective removal of organic pollutants by PMS-activated heterogeneous catalytic system has become one of the commonly used methods, but the adsorption of the catalyst is often ignored in the degradation process. Metal-organic frameworks (MOFs) are often used in the field of environment because of their high porosity and structural diversity/adjustability. However, there are still difficulties in the aggregation and recycling of nanoparticles . This study effectively synthesized the material CuS-PVP@ZIF-67 by using hollow spherical CuS as the carrier of Co-MOF (ZIF-67) to solve these problems. A high concentration of oxytetracycline hydrochloride (OTC) can be successfully adsorbed by electrostatic attraction and π-π interaction, and small amount of PMS may be quickly activated, and the removal rate of OTC is 94.82 % in 20 min. The catalyst used can be easily recovered by suction filtration and has good reusability. In addition, a potential cooperating mechanism for adsorption-PMS activation has additionally been proposed. The degradation pathway of OTC is determined, and the potential harm of intermediate products is analyzed. This work aims to create a heterogeneous catalytic system with significant adsorption and catalytic ability to remove refractory organic contaminants in water.
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Journal of Advanced Research
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2020
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IF 6.992
Tengfei Li,Meng Lu,Yuhang Gao,Xiaodong Huang,Guangyang Liu,Donghui Xu
In this study, a novel metal-organic framework (M-ZIF-8@ZIF-67) was successfully prepared using the single layer Fe 3 O 4 -ZIF-8 as magnetic core and wrapped a layer of ZIF-67 outer. This M-ZIF-8@ZIF-67 was employed as an adsorbent for the adsorption and removal of fipronil and its metabolites from environmental water and cucumber samples. The characterization results suggested that M-ZIF-8@ZIF-67 has the double layer structure a polyhedral structure with uniform pores, while ZIF-67 was successfully coated on the surface of Fe 3 O 4 -ZIF-8. The unique structure endowed M-ZIF-8@ZIF-67 a high surface area (219 m 2 /g) and high adsorption capacity for fipronil, fipronil desulfinyl, fipronil sulfide and fipronil sulfone. To our knowledge, this is the first report detailing the adsorption properties of M-ZIF-8@ZIF-67 with double layer structure relating to the adsorption and removal of pesticides. Furthermore, the adsorption model analysis demonstrated that the static adsorption data fitted the Freundlich bimolecular layer adsorption model better than the Langmuir monolayer adsorption model. This study indicates that M-ZIF-8@ZIF-67 has significant potential in the adsorption and removal of fipronil and its metabolites in water and vegetable samples.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yeqiang Lu,Hui Ma,Hanyue Kang,Zhiling Chen,Lei Qin,Zimo Lou,Lixin Xue
To address the increasingly severe oil spill accidents and water contamination, the development of super-wetting membranes with high oil/water separation efficiency is in great demand but remains challenging. The critical challenge lies in the rational design and fabrication of robust rough surface with hierarchical micro/nano-structure. In this study, biomimetic super-wetting polyacrylonitrile composite membrane was developed through in-situ synthesis and synchronous integration of zeolitic imidazolate framework nanoleaves (ZIF-Ls). Thorough investigation was conducted to assess the effect of the ZIF-Ls growth time on membrane morphology and surface wetting property. Incorporating the nanoleaf-like ZIF-Ls onto the surface of the membrane provided the surface with micro/nano rough structure and superamphiphilic/superlyophobic features. The prepared membrane showed great separation capability toward various O/W and W/O emulsions, and could be easily regenerated by employing a simple rinsing and drying procedure with high separation efficiency sustained even after multiple separation cycles. Moreover, the membrane with ZIF-Ls demonstrated outstanding catalytic performance in the Knoevenagel condensation. This study achieves advancements in the development of super-wettable membranes with outstanding performance in separating emulsions and the as-prepared membranes have the potential to serve as promising candidates for practical oily mixture treatment.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Chenhan Xiong,Qiang Long,Jiaqi Chen,Yanqiu Yu,Xinming Lian,Rui Xue,Junjie Wang,Shufang Zheng,Guoping Du,Nan Chen
Effective design and construction of highly electrochemically active materials on conductive substrates with hierarchical nanostructures are critical for enhancing the electrochemical energy storage performance of electrodes. However, the design of such special structures is still challenging. In this study, a special three-dimensional@three-dimensional (3D@3D) NiCo-layered double hydroxide (NiCo-LDH) composite nanostructure is developed through the innovative approach of in-situ growth of arrayed Co-Zif-L on conductive substrate, disrupting the Zif-67 formation. This is followed by ion exchange process and electrochemical synthesis for growing 3D NiCo-LDH nanosheets. A unique structure with the 3D NiCo-LDH embedded in the 3D Co-Zif-L structure, termed as 3D@3D, is resulted. This spatial structure not only enhances their mechanical stability and adhesion strength through the in-situ growth process, but also provides a greater number of electrochemical active sites due to its ultra-large specific surface area. Density functional theory (DFT) calculations reveal that the NiCo-LDH@Co-Zif-L composite nanostructure exhibits an enhanced density of states (DOS) near the Fermi level compared to individual components, indicating excellent conductivity. With this unique structure, the NiCo-LDH@Co-Zif-L/NF electrode demonstrates an area-specific capacity of 4.1C cm −2 and retains 81.9 % of its initial capacitance after 5000 cycles. Moreover, the assembled hybrid supercapacitor achieves an energy density of 222.2 mWh cm −2 at a power density of 800 mW cm −2 (66.9 Wh kg −1 at 245 W/kg). The innovative approach in this work provides new insights into the utilization of Zif materials and designing electrode materials with special structures for high-performance electrochemical energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yun Tang,Jingqi Ruan,Yalou Xin,Xiaohu Ren,Hudie Yuan,Xianhu Liu,Qiang Chen
The development of metal–organic frameworks (MOFs)-derived magnetic carbon-based materials for high-efficiency electromagnetic wave (EMW) absorption has attracted widespread attention. While these MOFs-derived composites have shown exceptional performance in absorbing EMWs within the X and Ku bands, the pursuit of effective absorption at lower frequencies remains a challenge. Herein, we demonstrate a novel strategy to synthesize hollow Co@C/C rods with excellent C-band EMW absorption via acetic acid etching and pyrolysis of core–shell ZIF-8@ZIF-67. Based on acetic acid etching, ligand-deficient ZIF-8@ZIF-67 rods with abundant mesoporous structures are constructed, enabling precise control over the Co nanoparticles content, graphitization degree, and pyridinic N doping in the derived Co@C/C. This simple fine-tuning approach simultaneously reduces dipole polarization by lowering the pyridinic N doping concentration, suppresses interfacial polarization and conduction loss through reducing the number of graphitic carbon layer, and enhances magnetic loss by increasing the Co content. These combined effects collectively improve the impedance matching of Co@C/C for low-frequency absorption. Notably, as the volume of acetic acid solution increases, the absorption frequency band of Co@C/C gradually shifts from the Ku-band to the C-band, while sustaining superior EMW absorption performance. At the filling ratio of merely 11 %, the RL min values for Co@C/C-20 and Co@C/C-30 achieve −49.8 dB and −34.7 dB at 7.2 GHz and 6.8 GHz, respectively. This study offers a valuable approach to the development of lightweight materials with excellent EMW absorption in C-band.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Shaojun Li,Xiaoxuan Fan,Zhongping Chen,Lei Bai
A nanosized zeolitic imidazolate framework-67 (ZIF-67) was employed for the adsorption of Cr(VI) under a neutral solution. It was discovered that the ZIF-67 demonstrated a high adsorption of Cr(VI) for the first (43.1 mg·g –1 ) and second run (40.2 mg·g –1 ). However, a self-sacrifice process of ZIF-67 was evidenced, possibly due to the oxidability of Cr(VI) and pH change, which resulted in a dramatically decrease of adsorption ability in the third run (16.6 mg·g –1 ). The adsorption process and its kinetics fitted the Langmuir model and pseudo-second-order rate equation and a multiple adsorption process was suggested.
研究领域:
材料科学
·
环境科学
·
化学工程
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Shuangyue Hou,Yue Lian,Yongqing Bai,Qiuping Zhou,Chaolei Ban,Zhifeng Wang,Jing Zhao,Huaihao Zhang
Transition metal sulfide is considered a promising electrode material for supercapacitors because of its high theoretical specific capacitance and good redox reversibility. However, it is difficult for a single material to deliver ideal specific capacity and cycling stability. Herein, we report a rhombohedral dodecahedral composite Co 3 S 4 @NiO for supercapacitor. This heterogeneous hollow structure of Co 3 S 4 @NiO exposes more active sites, promotes free diffusion of electrolytes, shortens the path of electron transfer in electrochemical reaction process, and improves the capacitance performance. The electrochemical test results show its specific capacitance up to 1877.93 F g −1 in 6 M KOH electrolyte at the specific current 1 A g −1 . In particular, the composite exhibits good cyclic stability with 92.6% capacity retention after 10,000 cycles at the specific current 5 A g −1 . Meanwhile, the asymmetric supercapacitors , assembled with Co 3 S 4 @NiO as positive electrode and activated carbon as negative electrode, delivered high energy density 54.99 Wh kg −1 as for the power density 0.78 kW kg −1 , also proving its high capacitance performance of Co 3 S 4 @NiO with unique structure.
研究领域:
材料科学
·
电化学
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高影响因子
危险品化学品经营许可证（带存储）