ANALYST
·
2015
·Vol. 140
·期 8
·2656-2663
·
IF 4.107
Na Yang,Hongjie Song,Xiangyu Wan,Xiaoqing Fan,Yingying Su,Yi Lv
A metal (Co)–Organic Framework (Co-MOF) was first found to catalyze the chemiluminescence (CL) of luminol. On the basis of X-ray photoelectron spectroscopy, powder X-ray diffraction, CL spectral, UV-visible absorption spectral, and electron spin resonance (ESR) spectral studies, as well as the research of the influence of various free radical scavengers, a possible CL mechanism was proposed. The enhanced CL might be attributed to the formation of a peroxide analogous complex between the oxygen-related radicals and the active metal site of the Co-MOF material. The established Co-MOF–luminol CL system was successfully applied to determine L-cysteine (CySH), based on the selective and sensitive enhancing effect of CySH on this CL system. Under the optimized conditions, CySH was selectively detected in the range 0.1–10 μM with a detection limit of 18 nM. This novel CL system obviously gives impetus to the new research field of metal–organic frameworks (MOFs) in chemiluminescence.
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Fugang Xu,Liwei Wang,Meijuan Wu,Guangran Ma
Application of metal organic framework (MOF) in electrochemical sensors usually suffer from poor conductivity, low electrocatalysis , material aggregation and complex electrode fabrication. Here, leaf-like Co-MOF ( L -Co-MOF) vertically grown on carbon cloth (CC) was prepared as integrated electrode for electrochemical detection . The L -Co-MOF/CC with interlaced Co-MOF nanosheets as building blocks greatly reduces aggregation, provides large surface area and highly exposed active sites to interact with analyte. The synergy between L -Co-MOF and CC endows the composite greatly enhanced electrocatalysis on oxidation of dopamine (DA) and uric acid (UA) compared with those of ordinary polyhedral Co-MOF or 2D Co-MOF grown in solution. The L -Co-MOF/CC can be directly used as working electrode without further modification, and it achieved the separate detection of DA and UA in the range of 5.6 nM-70 μM, and 21 nM-350 μM, respectively. Simultaneous detection of DA and UA was also performed with a LOD of 2.5 nM for DA and 7 nM for UA, respectively. The sensor with high reproducibility and good anti-interference properties also achieved practical sensing of DA and UA in serum with recoveries of 83.3–104.0%. Such integrated 2D-MOF-carbon material composite with unique structure and high electrocatalysis hold great promise in electrochemical device.
研究领域:
材料科学
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分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 7
·395
·
IF 4.2
Yanran Wang,Zhiqiang Wang,Yincheng Liu,Zixuan Liu,Zhan Gao,Kuangjun Li,Dajun Zhao,Jing Wu,Xuanhe Liu
The cobalt metal–organic framework (Co-MOF) is a kind of crystalline porous material within a periodic network structure, which is formed via the self-assembly of a Co metal center and a bridged organic ligand. In this paper, a Co-MOF was facilely synthesized via an ultrasonic method and applied to enhance the chemiluminescence (CL) emission of the NaIO4-H2O2system. The synthesized Co-MOF was nanosheet-like in nature and stacked in 2–3-micrometer flower shapes. Compared to the NaIO4-H2O2system without a Co-MOF, the CL intensity of the Co-MOF-NaIO4-H2O2system was enhanced about 70 times. This CL mechanism was determined to be a result of the synergistic effects of chemiluminescence resonance energy transfer (CRET) and electron–hole annihilation (EHA). The Co-MOF not only acted as a catalyst to accelerate the generation of reactive oxygen species in the CL reaction, but also worked as an emitter to further enhance the CL. Based on the Co-MOF-NaIO4-H2O2system, a highly sensitive CL analysis method was established for pyrogallol (PG) detection. Addition of PG into the CL system generated1O2*, which could transfer energy to the Co-MOF and further enhance the CL response. The enhanced CL was linear with the PG concentration. The CL analysis method exhibited a linear range of 1 × 10−4M to 1 × 10−7M, as well as having a linear correlation coefficient of 0.9995 and a limit of detection of (S/N = 3) of 34 nM.Keywords:ultrasonic;Co-MOF;chemiluminescence;pyrogallol detection
研究领域:
分析化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 21
·19477-19486
·
IF 2.195
Xu Chen,Feng Yan,Mao Zemin,Zhou Yingjie,Liu Li,Cheng Weihao,Wang Jinpei,Shi Hao,Liu Xiang
Metal–organic frameworks as electrode materials have attracted significant attention due to their high specific surface area and flexible structures. Compared with the metal–organic frameworks derived products, the direct applications of metal–organic frameworks as electrode materials are rather seldom because of their insufficient conductivity. Herein, binary nickel–cobalt based metal–organic frameworks are developed as electrode materials for supercapacitor. The binary metal based metal–organic frameworks behave better electrochemical performance than the sole metal base metal–organic frameworks, and this is majorly due to the synergistic effect between the binary metals. The highest capacitances of 978.9 F g −1 at 1 A g −1 at a nickel/cobalt ratio of 2:4 can be obtained. Meanwhile, the nickel–cobalt metal–organic framework presents excellent stability even after being run for 3000 cycles. The Ni–Co-2-4-MOF//AC asymmetric capacitor shows a high energy density of 14.77 Wh kg −1 and power density of 8477 W kg −1 . These results show that Ni–Co-MOFs have a promising applications in supercapacitor electrode.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Meng Zong,Keke Wang,Zongshan Lin,Zhenghua Tang
The development of abundant-element-based, cost-effective, and efficient catalysts for oxygen evolution reaction (OER) holds great promises to realize the practical water splitting. Herein, we report a facile phosphorylation treatment to boost the OER performance of NiCo metal organic frameworks (MOFs). Compared with the parent hollow bowl-like sphere NiCo-MOF, the optimal NiCo-MOF/Co 2 P 2 O 7 had a lower overpotential of 408 mV at 50 mA cm -2 and 583 mV at 200 mA cm -2 . The MOF/Co 2 P 2 O 7 sample also demonstrated markedly superior long term durability for OER to the benchmark RuO 2 catalyst. Such excellent performance can be attributed to the well-defined porous structure imparted enhanced reaction kinetics, the formation of phosphates with high oxygen content, and the synergistic catalytic effects of between Ni and Co. The findings here offer a new way in developing high-efficiency and durable MOF-based electrocatalysts for water splitting and beyond.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yuhu Feng,Mengran Lou,Luxiang Wang,Shengjiao Wen,Yang Wang,Ruiying Wang
Transition metal phosphides (TMPs) are often considered as a cost-effective replacement for precious metal catalysts in hydrogen evolution reaction (HER). Herein, the fibers are produced by combining coal with electrospinning technology, and then undergoing a pre-oxidation process for transforming into pre-oxidized coal-based fibers. Subsequently, CuCo-metal organic framework (CuCo-MOF) is grown on the pre-oxidized coal-based fibers using solvothermal method, and the Cu 3 P/Co 2 P/coal-based carbon fibers (Cu 3 P/Co 2 P/C-CFs) composite catalyst is successfully fabricated by phosphating at low temperature and carbonizing at high temperature. The uniformly grown nanoparticles (NPs) on the surface of C-CFs enhance the electrochemically active area, while the electron transfer between Cu 3 P and Co 2 P effectively modulates the electronic structure, increasing the catalytic activity of the catalyst for HER. In addition, the flexible C-CFs not only serve as self-supporting electrode but also effectively inhibit the agglomeration of Cu 3 P/Co 2 P NPs. Remarkably, the overpotential of Cu 3 P/Co 2 P/C-CFs is 83 mV at 10 mA cm −2 current density for HER in 0.5 mol L −1 H 2 SO 4 solution. This study presents promising strategies for the high value-added utilization of coal and the synthesis of highly effective non-precious metal catalysts.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Weixin Zhang,Shun Tang,Zhihua Chen,Xiaocui Xiong,Bo Chen,Kai Wu,Guohua Xu,Shijie Cheng,Yuan-cheng Cao
Lithium-oxygen (Li-O 2 ) batteries are considered as a new revolutionary energy storage technology due to their ultra-high theoretical energy density, but many problems of cathode restrict their further development. Here, we prepared a free-standing flexible Co-MOF/MXene hybird film for efficient Oxygen reduction reaction (ORR) and as cathode for Li-O 2 batteries by inserting 2D Co-MOF nanosheets between MXene layers based on electrostatic self-assembly strategy. The Co-MOF/MXene hybrid film with two-dimensional lamellar structure had high ORR catalytic activity, can provide faster Li + or O 2 expansion channels, promotes the deposition and decomposition of Li 2 O 2 , and it also breaks through the traditional concept of slurry method to prepare cathode of Li-O 2 batteries. Li-O 2 batteries based on Co-MOF/MXene hybird film as cathode had ultra-high capacity (34763 mAh/g at current density of 1000 mA/g), excellent cycle stability (278 cycles, limited capacity of 1000 mAh/g at current density of 1000 mA/g), and outstanding rate performance. Besides, the capacity and cycle performance of Li-O 2 batteries can be controlled by adjusting the loading of 2D Co-MOF and the thickness of Co-MOF/MXene hybrid film. The promising results provide insights the construction of air cathode structure for metal-air batteries, the design of efficient catalyst, and greatly expanded the scope of future research.
研究领域:
材料科学
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电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2023
·
IF 2.2
Tengjia Ni,Xianbiao Hou,Huanlei Wang,Lei Chu,Shuixing Dai,Minghua Huang
Defect engineering on metal-organic frameworks (MOFs) provides high flexibility to rationally design advanced oxygen evolution reaction (OER) catalysts with low overpotential and high stability. However, fundamental understanding the effect of defect concentration on catalytic OER activity is still quite ambiguous. Herein, the Co-MOF-D x catalysts with regulated oxygen defects concentration are deliberately constructed via coupling one-pot solvothermal synthesis with NaBH 4 chemical reduction process. Experimental findings propose that the oxygen defect concentration within Co-MOF-D x gradually increases with raising the NaBH 4 content, which could provide a flexible platform to tailor the electronic structure around active Co site and optimize adsorption/desorption capacity of oxygen intermediates. When the introduction content of NaBH 4 is up to 5 mg, the resulting abundant unsaturated coordination defects could endow the Co-MOF-D5 catalyst with optimized electronic structure and more exposed active sites for improving charge transfer and adsorption/desorption capacity. It is found that the optimized Co-MOF-D5 can drive the current density of 10 mA cm −2 only at a low overpotential of 300 mV with the small Tafel slope of 53.1 mV dec −1 in alkaline medium. This work sheds light on the way for the development of high-performance MOF catalysts via modulating defect concentration.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ya Yuan Zhang,Qiao Jing Lin,Ding Ling Gao,Yu Xiang Liu,Na Qin,Yan Xue Xue,Fei Fei Dai,Jian Hua Chen,Qian Yang
NHC/Co-MOF-Cu 2+ composite adsorbent materials were prepared through the in-situ synthesis of nitrogenous heterocyclic compounds (NHC) on Co-containing metal–organic framework (Co-MOF) using terephthalaldehyde (C 8 H 6 O 2 ) and p-Phenylenediamine (C 6 H 8 N 2 ) at room temperature. Subsequently, further modification with Cu 2+ was carried out. These materials were then utilized for the removal of dibenzothiophene (DBT) from simulated gasoline. The samples were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and other methods. The results indicated the uniform attachment of NHC and Cu 2+ metal particles onto Co-MOF, confirming the successful synthesis of NHC/Co-MOF-Cu 2+ adsorption materials. The introduction of Cu 2+ enhanced the π-complexation between NHC/Co-MOF-Cu 2+ and DBT. The introduction of NHC brought heteroatoms and ring structures to the composite, increasing the electron cloud density of the NHC/Co-MOF-Cu 2+ composite and thereby amplifying the π-complexation with DBT. The adsorption capacity of NHC/Co-MOF-Cu 2+ for DBT (150.4 mg/g) is significantly larger than that of Co-MOF (102.5 mg/g). The adsorption process of NHC/Co-MOF-Cu 2+ for DBT followed the pseudo-second-order kinetic model and Langmuir model. Additionally, the adsorption process was found to be spontaneous and exothermic. Over five consecutive adsorption–desorption cycles, the efficiency of NHC/Co-MOF-Cu 2+ decreased by only 10 %, indicating its excellent regeneration performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Nini Chen,Ding Chen,Fuhua Wei,Shuaiqi Zhao,Yun Luo
The Co-MOFs were efficiently and low-costly synthesized by microwave-assisted ball milling without organic solvents and the adsorption of Congo Red (CR) was studied in view of adsorption kinetic and isotherm. It's find that the formation of two different structures due to the change in the molar ratio of the raw material, which contribute to a larger difference of the adsorption. The maximum adsorption capacity of the Co-MOFs toward CR reached 4885.20 mg/g. Open active metal sites and π-π stacking interactions are thought to play an important role in the adsorption of CR onto the Co-MOFs.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Qiuhong Wei,Shujun Qiu,Chengwang Yin,Jiaxi Liu,Yongpeng Xia,Xin Wen,Yongjin Zou,Fen Xu,Lixian Sun,Hailiang Chu
Developing high-performance hydrogen generation/storage materials and technologies is an essential step for applying hydrogen-oxygen fuel cells under the background of carbon peak and carbon neutralization strategy. Ammonia borane (NH 3 BH 3 , AB) features a high volumetric and gravimetric density of hydrogen, showing great potential for chemical hydrogen storage. Exploring low-cost and high-efficiency catalysts is an essential prerequisite for hydrogen generation through AB hydrolysis under mild conditions. Herein, with rationally designing Ru/Co metal-organic framework (RuCo-MOF), a series of Co 2 P nanoparticles doping with low-content Ru embedded in nitrogen-doped carbon supported on graphene oxide (Ru-Co 2 P@N-C/GO) were synthesized via a one-pot phosphorization process. Benefiting from the unique structure and the electronic structure regulation of Ru, Ru-Co 2 P@N-C/GO exhibits excellent catalytic performance with an original turnover frequency (TOF) of 347.3 mol H2 mol Ru –1 min –1 and an excellent specific rate ( r B ) of 83,929 mL min –1 g Ru –1 toward AB hydrolysis. This work opens a new avenue toward developing effective and economic catalysts for AB hydrolysis.
研究领域:
材料科学
·
催化化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 9
·2410-2420
·
IF 2.799
Zanon Adriano,Chaemchuen Somboon,Verpoort Francis
Abstract Three different bimetallic zinc-cobalt zeolitic imidazolate frameworks (ZIFs) were successfully synthesized at room temperature in water through a green and simple procedure and tested as catalysts for the Knoevenagel condensation reaction between p -Br-benzaldehyde and malononitrile as model reaction. The materials were characterized with various techniques (XRD, ICP-AES, SEM, N 2 adsorption–desorption, TGA) and displayed excellent activities and selectivities. Moreover, the crystalline structure was preserved and the catalysts could be reused at least four times with negligible loss of activity. Graphical Abstract
研究领域:
化学
·
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）