JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Shufang Cui,Yuanchun He,Xiangjie Bo
In this work, FeCo nanoparticles encapsulated in graphitic carbon layers are derived by direct pyrolysis of Prussian blue/ZIF-67. First, the Prussian blue nanocubes with size of 100–150 nm are selected as cores for growth of ZIF-67 metal organic frameworks . Subsequent direct pyrolysis of Prussian blue/ZIF-67 in nitrogen atmosphere enables the formation of carbon nanospheres with FeCo nanoparticles embedded into the nitrogen-doped graphitic carbon layers. The encapsulation of FeCo nanoparticles into the nitrogen-doped carbon layers favors the electron penetration from the underlying FeCo nanoparticles to the nitrogen-doped graphitic carbon layers, tuning the electron density and the electronic properties at the carbon overlayers and then promoting the both hydrogen and oxygen evolution reaction activity. By optimizing the ratio between the Prussian blue and ZIF-67, the active and inexpensive carbon layers-encapsulated FeCo nanoparticles achieve high activity towards the hydrogen evolution reaction, exhibiting a low overpotential of 106 mV at 10 mA cm −2 as well as a low Tafel slope of 90.0 mV dec −1 . As oxygen evolution reaction electrocatalysts , the carbon layers-encapsulated FeCo nanoparticles deliver an overpotential of 312 mV at 10 mA cm −2 and a low Tafel slope of 40.6 mV dec −1 . Severing as both anode and cathode, the carbon layers-encapsulated FeCo nanoparticles show a potential of 1.495 V at 10 mA cm −2 for water splitting, which is close to the noble metal benchmarks of Pt/C and RuO 2 counterparts. The carbon layers-encapsulated FeCo nanoparticles can be used as an attractive replacement for electrocatalytic water splitting.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
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IF 3.235
Xuejiao Liu,Wanwan Chen,Meiling Lian,Xu Chen,Yanluo Lu,Wensheng Yang
Metal-organic frameworks (MOFs) as a type of potential matrix for enzyme immobilization have attracted much interest. However, the sensitivity of most MOF-enzymatic electrochemical biosensors has not been satisfactory so far due to the poor conductivity and low apparent affinity of MOFs. In this work, new strategies have been presented: (i) using MOFs that themselves possess catalytic properties for substrates, so the synergistic catalysis by combining the MOFs and immobilized enzymes can be reinforced; (ii) introducing hydrophilic carbon nanomaterials and preparing MOF/carbon composites, not only the conductivity of the matrix but also the apparent affinity of immobilized enzyme for hydrophilic substrate can be remarkably enhanced. Horseradish peroxidase (HRP) and zeolite imidazolate framework-67(Co)/multi-walled carbon nanotube composite (ZIF-67(Co)/MWCNT) were adopted as the model enzyme and the immobilized matrix to illustrate and examine the proposed strategies. Compared with single component (ZIF-67(Co) or MWCNTs) based HRP electrochemical biosensors, the composite electrochemical biosensor displayed increased apparent substrate affinity (Michaelis constant K m reduced by ~75%) and 1.3-fold increased sensitivity in the detection of H 2 O 2 . The sensitivity (315 μA mM −1 cm −2 ) was also much larger than that of most previously reported MOF-HRP electrochemical biosensors. The proposed strategies are envisaged to be useful for other MOF-enzymes systems, which will be beneficial to the development of biocatalysis and biosensing.
研究领域:
生物化学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 41
·5483-5491
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IF 3.1
Shengyu Cao,Shanshan Huang,Chudi Yang,Lili Lian,Minhong Ren,Dazhi Sun
Phenoxy carboxylic acid (PCA) herbicides are commonly used herbicides that can easily accumulate in soil, groundwater, crops, and vegetable surfaces. Thus, they pose a serious risk to human health. Accurate detection of trace amounts of PCAs in various matrixes is crucial. Herein, ZIF-67-modified magnetic nanoparticles (MNPs, ZIF-67@Fe3O4) were prepared by growing ZIF-67 on the surface of Fe3O4 MNPs. The introduction of ZIF-67 improved the dispersion of Fe3O4 nanoparticles in water and enhanced their extraction performance for PCAs. When an eluent consisting of ammonia water and acetonitrile (5% : 95%; v/v) was employed, 10 mg of ZIF-67@Fe3O4 displayed optimal extraction performance for PCAs in a 20 mL sample solution at a pH of 3. We achieved a limit of detection ranging from 0.014 μg L−1 to 0.056 μg L−1 for four types of PCA herbicides by using the newly developed method. Notably, the values were considerably lower than the maximum concentration levels of PCAs in drinking water set by the Environmental Protection Agency. The relative recovery rate of PCAs using ZIF-67@Fe3O4 ranged from 83.75% to 117.07% when applied to river water and apple samples. These results demonstrate the great potential of ZIF-67@Fe3O4 in determining the residues of organic pesticides in real samples.
研究领域:
环境科学
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分析化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
ENERGY
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2024
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IF 9
Yuechi Che,Xiaopeng Jia,Yongjie Hu,Jian Li,Zhi Wang,Beibei Yan,Guanyi Chen
Tar catalytic removal is a key issue in biomass gasification , which is suffering from catalyst coking and sintering. Microwave technology is attractive due to the high activity on polar molecules and ability to lower activation energy . In this study, the Co/C derived from metal-organic frameworks (ZIF-67) was developed as a bifunctional microwave catalyst that can strengthen the interaction between microwave and tar catalytic reforming , and enhance the anti-coking and sintering ability. The effects of the temperature, heating method, tar concentration, and catalyst support on model tar conversion rate were investigated. The operating conditions at 700 °C and tar concentration lower than 20 g/m 3 can reach a promising conversion rate over 90.15 % under microwave irradiation . On the one hand, microwave heating groups performed better in conversion rate and coking compared to conventional heating, due to the active species generated from the microwave plasma . On the other hand, Co/C showed better performance in catalytic activity and sintering stability, due to the highly dispersion of cobalt nanoparticles and the confinement effect of carbon nanotubes on the catalyst surface . These findings proposed a novel approach for efficient biomass tar removal under microwave irradiation, and offered a potential tool to further reveal the mechanism in microwave driven tar steam reforming system.
研究领域:
能源与环境科学
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催化化学
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产品关联
DOI
高影响因子
ENERGY & FUELS
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2024
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IF 5.2
Jinhong Wu,Xiaohan Sun,Haosen Chen,Siwei Guo,Dong Hou,Deyong Wang,Huihua Wang
Oxygen evolution reaction (OER) impedes the electrochemical water splitting for H2 production, ascribing to the depressed kinetics of the four proton-coupled transfer process. Transition metal oxides, especially bimetallic oxides, have been proven to be promising OER electrocatalysts due to their part unoccupied d-band characteristics. More interestingly, oxygen vacancies (Ov) easily constructed in transition metal oxides can modulate the electron structures and thereby boost the OER performance. However, most synthesized processes involving oxygen vacancy engineering, such as atom dopant, chemical/electrochemical reduction, and H2/Ar-dependent calcination, are energy-intensive and time-consuming, largely hampering their commercial applications. Herein, we suggest a simple and facile strategy for fabricating double spinel oxides with abundant oxygen vacancies by calcinating Ni/Fe@ZIF-67/CC precursor under a nonoxidation condition. The obtained Ov-CF1N2O@NC/CC-550 with vast oxygen vacancies exhibits excellent OER performance, representing a lower overpotential of 185 mV at 10 mA cm–2, smaller Tafel slope of 47.3 mV dec–1, as well as faster interface reaction kinetics (Rct = 0.7336). Theoretical calculations further confirm that the excellent electrochemical activity strongly corresponds to the lower d-band center of active sites on the Ov-CoFe2O4 (311) model and decreased reaction Gibbs energy barrier. The work might shed light on oxygen vacancy engineering via a simple and facile strategy and inspire a smart design of multimetallic oxide electrocatalysts with high OER performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2022
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IF 6.267
Yanan Deng,Yuanyuan Shen,Yao Du,Takashi Goto,Jianfeng Zhang
The development of high-performance electrode materials with a far-from-enough energy density has still been crucial for the real applications of supercapacitor technology. In this paper, the N-doped and derivatized-carbon-intercalated Ti 3 C 2 T x , abbreviated as N–Ti 3 C 2 T x /C, was firstly fabricated using ZIF-67 as an intermediate precursor. Then N–Ti 3 C 2 T x /C/CuS was prepared by further intercalation with CuS nanoparticles through a room-temperature-in-situ-reaction route. The doped pyridine N and pyrrolic N, together with derivatized carbon, optimized the surface charge distribution of Ti 3 C 2 T x with increased active sites. In addition, CuS nanoparticles were observed distributed on the surface and between layers of single/multi-layered two-dimensional N–Ti 3 C 2 T x /C nanosheets, forming a heterogeneous three-dimensional structure. Therefore, the specific capacitance of the N–Ti 3 C 2 T x /C/CuS composite at a current density of 1 A g −1 reached 1205.8 F g −1 , about 5 times that of N–Ti 3 C 2 T x /C and 2 times of CuS, also much higher than other composite reported in the literature. The energy density and power density of N–Ti 3 C 2 T x /C/CuS, as a symmetric supercapacitor electrode, are 77.22 Wh·kg −1 and 649.54 W kg −1 , respectively. More importantly, N–Ti 3 C 2 T x /C/CuS has an excellent stability after 3000 cycles, surpassing that of similar electrode materials reported in literature. This study opens a new direction for enhancing the energy density of supercapacitors with modified electrode materials through a MOF-mediated strategy.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Chunyan Liu,Yanjuan Liu,Yuefei Zhang,Wei Chen,Sheng Tang
In this work, zeolitic imidazolate framework-67 (ZIF-67) with excellent stability synthesized at room temperature was used together with amphiphilic polymer hydrogel to synthesize a captivating mixed-mode silica stationary phase for the first time. The amphiphilic polymer hydrogel prepared by weakly basic cationic and acidic anionic monomers that was modified on the surface of ZIF-67@SiO 2 by a simple physical coating method not only improved the separation performance, but also enhanced the applicability of ZIF-67@SiO 2 in chromatographic analysis. Meanwhile, the porous ZIF-67 effectively alleviated the problem that polymer hydrogel was easy to swell. To sum up, the amphiphilic polymer hydrogel and ZIF-67 showed excellent synergistic effect in improving the separation ability and the applicability of stationary phase. The experimental results demonstrated that the ZIF-67/hydrogel@SiO 2 stationary phase could be applied in various chromatographic separation modes, demonstrating superior resolution and separation selectivity for polycyclic aromatic hydrocarbons, steroid hormones, nucleosides, B-vitamins, sulfonamides, benzoic acids and dinitrobenzene isomers. In this study, the synergistic expression of ZIF-67 and polymer hydrogel provided a new idea for the development of silica stationary phase co-modified by metal-organic framework and hydrogel material. Concurrently, the successful preparation of ZIF-67/hydrogel@SiO 2 composite revealed a new possibility for utilizing ZIF-67 as the functional material of stationary phase, expanding the application potential of ZIF-67 in the field of chromatography.
研究领域:
分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
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IF 2.6
Mou Yuhang,He Qing,He Ying,Meng Chenyao,Liu Hui,Li Liang
Supercapacitors as green energy storage devices are widely utilized in vehicle manufacturing, rail transportation, power systems, and other fields. In this study, petal-like NiO was synthesized via a one-step hydrothermal method, followed by the preparation of NiO@ZIF-67 composite electrode material at room temperature. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) tests demonstrated that the NiO in NiO@ZIF-67 possesses a porous petal-like structure, with ZIF-67 particles uniformly growing on NiO sheets. The effect of ZIF-67 content on the electrochemical performance of NiO was investigated, and results showed that NiO@ZIF-67/1, prepared with a mass ratio of NiO to Co(NO₃)₂·6 H₂O of 1:1, exhibits the optimal electrochemical performance. The specific capacitance of NiO@ZIF-67/1 electrode material reached 188.44 F·g⁻¹ at 1 A/g. Furthermore, the symmetric supercapacitor assembled with NiO@ZIF-67 exhibited a maximum energy density of 41.76 Wh/kg at 1.4 kW/h, with a capacitance retention rate of 87.2% after 5000 cycles. Graphical abstract
研究领域:
材料科学
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能源存储与转换
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产品关联
DOI
高影响因子
npj Materials Degradation
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2025
·Vol. 9
·期 1
·1-14
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IF 7.6
Xiang Tengfei,Chen Xuxin,Wang Jihuai,Liu Di,Cui Linjing,Wang Tao,Zhang Zhenya,Yang Yang,Zhang Shihong
Metal corrosion poses significant economic and safety challenges across industries, necessitating efficient cathodic protection strategies. Triboelectric nanogenerator (TENG) offers a promising self-powered solution by harvesting ambient mechanical energy. This study presents the design of TENG based on fluorinated ZIF-67/PDMS (F-ZIF-67/PDMS) composites for enhanced cathodic protection of 304 stainless steel (304SS). The present study integrates dual regulation of microstructure and surface energy to synergistically enhance the triboelectric performance. While loading 5 wt.% ZIF-67, the TENG achieved remarkable output performance with an open-circuit voltage of 187.14 V, short-circuit current of 37.46 μA, and transferred charge of 72.54 nC, delivering a peak power of 3.08 mW. When integrated with a cathodic protection system, the TENG significantly reduced the open-circuit potential (OCP) and the corrosion rate. This work advances the integration of MOF-based triboelectric materials with energy harvesting technologies, offering a sustainable approach to mitigating metal corrosion.
研究领域:
材料科学
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纳米技术
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电化学
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能量收集
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腐蚀工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
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2024
·
IF 14.3
Yanghai Gui,Jintao Wu,Di Zhao,Kuan Tian,Shuaishuai Zhao,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Dongjie Guo,Yun Wang
H 2 S gas sensors with facile preparation, low detection limits, and high selectivity are crucial for environmental and human health monitoring. However, it is difficult to maintain a high response of H 2 S gas sensors under high humidity in practical applications. To face this dilemma, a layer-by-layer growth method is applied to in situ prepare a nanostructured Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 coated by a hydrophobic hierarchical ZIF-67 as the H 2 S sensor. This novel composite exhibits excellent humidity immunity without sacrificing the excellent sensitivity and selectivity of H 2 S. At a low operating temperature of 90 °C, a remarkable response value of 1052.3 to 100 ppm H 2 S has been achieved, which is 779 and 9.36 times higher than that of pure WO 3 and Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 , respectively. More importantly, an 82.2% relative response value remains at a high humidity of 75%RH. The sensing mechanisms are investigated using gas chromatography-mass spectrometry (GC-MS), which revealed that the reaction products are H 2 O and SO 2 . The high humidity immunity and fast response of the Co(CO 3 ) 0.5 (OH)·0.11H 2 O@ZIF-67/WO 3 demonstrate the layer-by-layer in situ synthesis method holds the potential application for the development of high-performance WO 3 -based H 2 S sensors.
研究领域:
材料科学
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环境监测
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传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
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2024
·
IF 5
Mengqing Zhou,Changzhou Chen,Jie Jiang,Yajun Liu,Jianchun Jiang
Exploring lignin depolymerization and modification can yield high-value chemicals and liquid fuels, thereby enhancing resource utilization efficiency and alleviating pressure caused by energy shortages. In this paper, lignin-based carbon materials (Co-ZIF@KL-1 and Co-ZIF@KL-2) loaded with a metal–organic framework (ZIF-67) on kraft lignin biochar (KL) were prepared using two different methods (In situ method and traditional immersion method). In addition, catalysts with Co metal loaded on KL biochar (Co@KL) and ZIF-67 catalyst were also prepared for comparison with the above two different Co-ZIF@KL-1 and Co-ZIF@KL-2 catalysts. These catalysts were all applied to the hydrodeoxygenation (HDO) of guaiacol. Among them, the Co-ZIF@KL-1 catalyst exhibited the highest catalytic activity with 94.53% conversion of guaiacol and 83.86% selectivity of cyclohexanol under the optimal reaction conditions of 240 °C, 2.0 MPa N2, and 4 h. The superior catalytic performance can be attributed to its high surface area, strong stability, and appropriate acidic sites. Based on the distribution of catalytic products, pathways for the guaiacol HDO reaction are hypothesized. In general, ZIF materials and lignin composites offer substantial value for advancing biomass catalytic conversion in the future.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
·
IF 5.268
Zhiyue Li,Zhiwei Guo,Taoyi Zhang,Quan Li,Jing Chen,Wenxi Ji,Cong Liu,Yun Wei
Synthesizing high uniform metal-organic frameworks grown on natural biomass such as sodium alginate (ALG), which can efficiently remove metal ions from aqueous solution, is a challenging project. A simple and eco-friendly method of preparing ALG@ZIF-67 hydrogels by in situ synthesis of ZIF-67 onto ALG hydrogels was established. Combining the virtues of ALG with abundant hydroxyl and carboxyl groups and ZIF-67 with excellent porous structure, the obtained ALG@ZIF-67 hydrogels have excellent adsorption for Cu 2+ (153.63 mg/g), which was much higher than that of pure ALG hydrogels (111.79 mg/g). The methodology showed that the adsorption process was in accord with the Langmuir isotherm adsorption model (R 2 = 0.9972) and pseudo-second-order kinetic model (R 2 = 0.9822). The thermodynamic experiments demonstrated that Cu (II) was absorbed by hydrogel with an endothermic and spontaneous process. The competitive adsorption experiment results of ALG@ZIF-67 hydrogel indicated that the absorption capacity of Cu (II) was higher than that of Cd (II), Ni (II), Zn (II) and Mn (II). Moreover, the ALG@ZIF-67 hydrogels still had excellent reusability after five adsorption-desorption cycles. The results indicated that the ALG@ZIF-67 hydrogels had the advantages of low cost, easy preparation, and environment friendly.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）