JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Yuhan Cui,Chunyan Zhao,Lijie Zhao,Xiaohong Zhang,Jianxin Wang
As a new environment-friendly energy storage system between traditional capacitors and lithium-ion batteries, supercapacitors have many excellent characteristics compared with other energy storage devices. The new electrode material is the key component to determine the performance of the supercapacitor. Combined with the relevant literature reports of researchers in recent years, the structure and properties of Co, Zn, Ni and other materials were introduced, and the preparation method of Co–Zn as electrode material was sorted out. The rGO/Zn 0.773 Co 0.227 S composites were prepared by a simple template method to analyze the structure and morphology, and rGO/Zn 0.773 Co 0.227 S was treated to make it a paste adhering to nickel foam. Benefiting from the synergistic effect between Zn 0.773 Co 0.227 S and rGO , the composite provides significantly improved energy storage capability in a three-electrode system. The specific capacitance can reach 1680 F g −1 at the current density of 1 A g −1 . When the current density is increased to 10A g −1 , the specific capacitance still reaches 895.4 F g −1 , and the loss of the specific capacitance is only 22.2% after 5000 cycles at 10 A g −1 . When rGO/Zn 0.773 Co 0.227 S is used as cathode material and AC as negative material, asymmetric supercapacitor also has good cycle stability and high energy density .
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高影响因子
IONICS
·
2021
·Vol. 28
·期 2
·635-645
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IF 2.817
Zhao Wei,Feng Wangjun,Chen Jingzhou,Huang Zhaoyu
Lithium-sulfur batteries (LSBs) are considered the most likely replacement for conventional lithium–ion batteries in next-generation high-energy output solutions based on their high specific capacity (1675 mAh g −1 ) and high-energy density (2600 Wh kg −1 ). But, there are some problems that need to be solved urgently. In this work, an environmentally friendly, green, and low-cost ZIF-67-derived cobalt-based sulfate material (CoSO 4 ) combined with carbon nanotubes was proposed as a sulfur host material. Experiments show that the addition of CoSO 4 can significantly enhance the transformation of polysulfide and suppress the shuttle effect. The best performance is the CNT-CoSO 4 -2/S, which has an initial capacity of 1356.9 mAh g −1 at 0.1 C current density. Furthermore, long-term cycle test was carried out at a current density of 0.2 C; the coulombic efficiency was above 98.63% after 200 cycles. This work demonstrates the potential of cobalt-based sulfates as cathode materials for lithium–sulfur batteries.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Juan Han,Wenrui Huang,Man Zhao,Jiacong Wu,Yuanyuan Li,Yanli Mao,Lei Wang,Yun Wang
Herein, a glucose [email protected] composite (3-MPBA/ [email protected] ) with enhanced enrichment was enabled the rapid encapsulation of glucose oxidase (GOx) into microporous zeolitic imidazolate framework-8 (ZIF-8) for the first time. The 3-MPBA/ [email protected] not only has improved affinity and catalytic efficiency to the substrate but also can shorten the formation time. The optimum loading amount of GOx on ZIF-8 was determined to be 470 mg/g. The as-prepared 3-MPBA/ [email protected] composite maintained the native conformation of the enzyme and showed excellent bioactivity, even in chemical agents or at high temperature. Furthermore, the 3-MPBA/ [email protected] showed satisfactory reusability, preserving almost 80.8 % activity after 7 cycles. The Michaelis constant K m and specificity constant k cat / K m of the 3-MPBA/ [email protected] were 0.03 ± 0.02 mM and 63.87 ± 1.96 s −1 mM −1 , respectively, which were superior to corresponding values of free GOx. Therefore, the 3-MPBA/ [email protected] displayed high catalytic efficiency, high loading efficiency and enhanced stability. Moreover, a new type of visual colorimetric sensor for screening of the diabetes was realized through the 3-MPBA/ [email protected] , which provided a new strategy for the analysis field of glucose.
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PubMed
高影响因子
ChemCatChem
·
2021
·Vol. 13
·期 24
·5166-5177
·
IF 5.686
Chuanhui Li,Ye Meng,Song Yang,Hu Li
Graphical Access to bio-nitrogenous chemicals : A Co-embedded N-doped carbon nanocatalyst can efficiently promote Leuckart-type reductive amination of biomass-derived carbonyls to prepare N-formyl compounds, which benefits from the synergy of its Co NPs and N base sites. The initial formation of the C−N bond occurs between carbonyls and H 2 NCHO rather than HCOONH 4 . It is of great significance to develop non-precious metal catalysts with excellent catalytic activity, stability, and acid resistance for biomass valorization. Herein, catalytic amination of biomass carbonyl compounds was achieved via a Leuckart-type reaction over Co nanoparticles (NPs) embedded N -doped carbon catalyst, which was prepared by thermolysis of ZIF-67 precursor at different temperatures in the N 2 atmosphere. The Co/NC-800 catalyst exhibited excellent catalytic activity and recyclability in furfural reductive amination to mono-substituted formamide, which was attributed to the synergistic catalytic action of Co NPs and nitrogen base sites of the catalyst. The reductive amination mechanisms were elucidated by theoretical calculations, and showed that the initial formation of C−N bond was derived from the condensation of furfural and formamide, followed by dehydration to form C=N double bond, which was then reduced by hydrogen species Co−H − and NH + . The developed catalytic system was applicable to different carbonyls for the synthesis of corresponding N -formyl compounds with up to 99 % yield.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yuxiao Feng,Yingjie Du,Geling Kuang,Le Zhong,Hongtong Hu,Shiru Jia,Jiandong Cui
Metal–organic frameworks (MOFs), with large specific surface area and tunable porosity, have gained lots of attention for immobilizing enzymes. However, the intrinsic open channels of most reported MOFs are generally smaller than 2 nm, which significantly prevents the passage of enzymes, and the diffusion efficiency of substrates and products. Here we report a new hierarchical micro-mesoporous zeolitic imidazolate framework-8 (ZIF-8) with core–shell superstructure (HZIF-8) using colloidal hydrated zinc sulfate (ZnSO 4 ·7H 2 O) as a soft template for enzyme immobilization. The ZnSO 4 ·7H 2 O forms an aggregation of colloids due to the self-conglobation effect in methanol, which affords a soft template for the formation of HZIF-8. Cytochrome C (Cyt C) was immobilized in interior of HZIF-8 through entrapment during the formation of HZIF-8. The resultant immobilized Cyt C (Cyt [email protected] ) exhibited 4-fold and 3-fold higher activity than free Cyt C and Cyt C encapsulated in conventional microporous ZIF-8 (Cyt [email protected] ), respectively. Meanwhile, the Km value of Cyt [email protected] significantly decreased due to the presence of mesopores compared with Cyt [email protected] , indicating enhanced substrate affinity. After 7 cycles, Cyt [email protected] still maintained 70% of its initial activity whereas Cyt [email protected] only retained 10% of its initial activity. Moreover, the obtained HZIF-8 showed outstanding performance in co-immobilization of multi-enzyme for the detection of glucose.
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高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 47
·5777-5786
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IF 2.896
Jinyang Chen,Jiamei Wang,Ruihong Ye,Dihui Huang,Sheng Chen
The low conductivity of metal–organic frameworks seriously impedes their electrocatalytic performance. In this study, we prepared a fabricated sandwich structure composed of a Co-based zeolitic imidazolate framework (ZIF-67) and reduced graphene oxide (rGO) through a facile and simple one-pot hydrothermal reaction. This framework of nanocomposites, which are modified with a glassy carbon electrode, constructed a bisphenol A (BPA) electrochemical sensor for the first time. Operational parameters such as pH, electrolytes, the amount of modifiers, deposition potentials and deposition time were optimised for the sensitive detection of BPA. The performance of electrodes was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction and transmission electron microscopy. With differential pulse voltammetry, the detection concentration of BPA ranged from 0.05 μmol L−1 to 100 μmol L−1. The results revealed that the hierarchical nanocomposites demonstrated better electrocatalytic performance with large electrochemically active surface areas, high sensitivity and a low limit of detection (5.2 nmol L−1), compared with a physical mixture of ZIF-67 and rGO at the same ratio. These impressive features originate from the synergistic effects of ZIF-67 and rGO. This study presents a new strategy using metal–organic framework composite materials for the sensitive detection of BPA.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hang Chen,Ya-Qi wang,Fei Huang,Chao Tu,li Cui
A novel strategy for preparing Zeolitic Imidazolate Frameworks-8 (ZIF-8) based photocatalytic material with high efficiency, durability and recyclability is proposed. ZIF-8 is prepared by self-assembly layer-by-layer on carboxyl cotton fabric. The coordination bond formed by metal ions and carboxyl groups of carboxyl cotton fabric greatly enhances the interaction between particles and fabric. Semiconductor MoS 2 is grown in situ on the surface of ZIF-8 to improve photocatalytic activity of ZIF-8. The morphology and structure of prepared MoS 2 /ZIF-8/Carboxyl cotton are characterized. The influence of layer-by-layer self-assembled ZIF-8 on the charge separation efficiency and optical properties of functional materials are investigated by electrochemical impedance spectroscopy and photocurrent. Under visible light irradiation, this functionalized fabric has good degradability to methylene blue. About 99.8% of methylene blue aqueous solution is degraded after exposure to visible-light for 21 min. Furthermore, about 94.8% photocatalytic activity is still maintained even after six times of recycling. Possible mechanisms accounting for the enhanced photocatalytic properties are proposed. This fabrication method used in this study shows great potential in the development of textile-based multifunctional photocatalytic materials with high degradation efficiency and high recovery rate.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Shi-Wen Lv,Ning Zhao,Jing-Min Liu,Fei-Er Yang,Chun-Yang Li,Shuo Wang
Integration of novel bio-/nanostructures as effective sensing platforms is still of great significance for robust and rapid analysis. Herein, a novel metal–organic framework-derived NiCo2O4 was synthesized via a feasible templating method. Significantly, redox couples of both Ni3+/Ni2+ and Co3+/Co2+ provided richer oxidation–reduction reactions, thereby leading to an enhanced catalytic activity. Furthermore, NiCo2O4 as an enzyme mimic with peroxidase-like activity and oxidase-like activity could oxidize colorless thylbenzidine (TMB) to blue oxTMB in the absence of H2O2. Thus, a sensitive chromogenic sensing platform for detecting Fe2+, thiourea, cysteine (Cys), and epigallocatechin-3-gallate (EGCG) was proposed. The colorimetric detection methods exhibited great features of low limit of detection (LOD) and broad linear range. Owing to the complexation reaction, the chromogenic sensing system of TMB + NiCo2O4 + Cys achieved effective detection of Cu2+ and Mn2+ with the LODs of 0.0022 and 0.0181 mM, respectively. Developed detection methods with wide linear ranges of 0.008–0.1 mM for Cu2+ and 0.08–1 mM for Mn2+ had excellent practical potential. Similarly, the reaction system of TMB + NiCo2O4 + EGCG could achieve the colorimetric detection of Cu2+ and Fe3+. The great chromogenic sensing performance for detecting Cu2+ and Fe3+ with a broad linear range and a low LOD could be also realized.
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高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 4
·045012
·
IF 1.62
Fei Ge,Rui Qiao,Ping Song,Yugui Tao,Longbao Zhu,Weiwei Zhang,Wanzhen Li,Lin Gui
Tumors area common cause of morbidity and mortality. High treatment efficiency and low drug toxicity are key for effective tumor treatment. Here, the pH-sensitive material ZIF-90 was synthesized by the liquid-phase diffusion method for loading paclitaxel (PTX), and the targeting peptide (RGD) was prepared by the solid-phase synthesis method to modify it (RGD/PTX@ZIF-90). The skeleton of RGD/PTX@ZIF-90 collapses in the acidic tumor microenvironment, thereby releasing PTX and mediating the controlled release of the drug. ZIF-90 below 300 nm was obtained by adjusting the ratio of metal ions and organic ligands in the characterization experiment. In addition, in vitro drug release experiments showed that the drug release rate was greater at pH = 5.5 than at pH = 7.4. The lethal rate of RGD/PTX@ZIF-90 to human breast cancer cells (MCF-7) was 44.5%, which was higher than the lethal rate of PTX alone (37.3%) in the cytotoxicity experiment and apoptosis experiment. Uptake experiments revealed that RGD/PTX@ZIF-90 mainly existed in the cytoplasm of MCF-7, which suggests that the drug had successfully entered the cell to achieve the therapeutic effect. The loading of the nano-medicine carrier ZIF-90 and the modification of the targeting peptide RGD significantly improve the therapeutic effect of PTX and indicate that this system could be used to treat breast cancer.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Ying Wu,Guilu Xu,Weilin Zhang,Chi Song,Linjie Wang,Xingyu Fang,Lijie Xu,Shuguang Han,Juqing Cui,Lu Gan
In this study, binder-free hybrid supercapacitance electrode based on N, Co co -doped porous carbon polyhedral encapsulated carbon nanofibers composites (N-Co/CNF) was prepared through pyrolyzing cobalt based zeolitic imidazolate frameworks (ZIF-67(Co)) incorporated electrospun cellulose nanofibers. With rational combination of the conductivity provided by cellulose derived CNF, promising porosity provided by CNF and ZIF-67(Co) derived porous carbon and uniformly dispersed metallic cobalt nanoparticles , the N-Co/CNF displayed excellent electrochemical properties. Specifically, the N-Co/CNF pyrolyzed at 800 °C possessed superior electrochemical performance in 1 M H 2 SO 4 electrolyte, including a specific capacitance of ~433 F/g and 84% of the capacitance retention after 3000 consecutive charge-discharge cycles. This significantly exceeded the performance of cellulose derived CNF based pure carbonaceous electrode. Therefore, the present study provides a new view on the construction of high performance hybrid supercapacitance electrode which introduces renewable biomass resources like cellulose as both carbonaceous material precursors and conductive binders.
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高影响因子
ANALYTICAL BIOCHEMISTRY
·
2021
·
IF 3.365
Xin Liu,Jihong Fu,Lili Wang,Caijuan Wang
A novel microwave-assisted (MA) headspace solid-phase extraction (HS-SPE) based on polydimethylsiloxane (PDMS)/ZIF-8@GO sponge was developed for the simultaneous extraction and determination of essential oil constituents in lavender. The PDMS/ZIF-8@GO sponge with a high surface area and excellent adsorption capacity was successfully applied in the HS-SPE process. Microwave-assisted coupled with PDMS/ZIF-8@GO sponge headspace solid-phase extraction followed by GC-MS was proposed. Different experimental parameters were investigated. The optimal conditions were found to be as follows: 2:1 as the quality ratio of ZIF-8 to GO , ZIF-8@GO dosage of 30 mg, microwave power of 600 W, extraction time of 10 min and desorption solvent of n -hexane. This method was successfully applied to the analysis of 11 samples of lavender in different varieties. A total of 52 compounds were identified by the proposed method. A good linearity was observed from 14 to 800 ng with a correlation coefficient (R 2 ) value of >0.99. Multivariate statistical analysis was used to establish the relationship between the varieties and the volatile components for further discriminant analysis. These results demonstrated that the MA-PDMS/ZIF-8@GO is an efficient, sensitive and small sample consumption method for the determination of the essential oil in dried plant materials.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Na Chang,Yan-Ru Chen,Feng Xie,Ya-Pan Liu,Hai-Tao Wang
It is of great importance to fabricate photocatalyst with high photocatalytic activity, and the formation of Z-scheme heterojunction photocatalyst has been proved to be an effective way to restrain the recombination of photo-induced carriers. In this work, Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction is synthesized via a two-step process involving appropriate amount of cationic Ag ion doping into the imidazole ring of ZIF-8 framework and the precipitation of AgCl onto this Ag-doped-ZIF-8. The successful doping of ZIF-8 which decreases the band gap energy, enhances the light harvesting. Besides, the separation efficiency of photo-induced carriers is further improved due to the formation of Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction, which is confirmed by photoelectrochemical experiments. As a result, the as-prepared AgCl/Ag-doped-ZIF-8 photocatalyst possesses excellent photocatalytic activity under visible light illumination. This work will provide a novel perspective for the design and construction of Z-scheme heterojunction for highly efficient photocatalysis.
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高影响因子
危险品化学品经营许可证（带存储）