Synthesis and application of a MOF-derived Ni@C catalyst by the guidance from an in situ hot stage in TEM

Xu, Dan; Pan, Ying; Chen, Mingyi; Pan, Qinying; Zhu, Lei; Xue, Ming; Zhang, Daliang; Fang, Qianrong; Qiu, Shilun

doi:10.1039/c7ra03162a

Cited by 31 publications

(19 citation statements)

References 45 publications

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“…This may be due to the low degree of crystallization of Co nanoparticles in Co@ NC-500 and the carbon matrix around the Co nanoparticles is unstable. 51 The above results indicate that 600 °C is the optimal carbonization temperature for preparing the catalyst. The Co@NC-600 catalyst we designed has better performance than the previously reported transition-metal catalyst and is even comparable with that of the more active precious-metal catalyst (Table S2).…”

Section: Resultsmentioning

confidence: 78%

“…The reduction reaction completion time is 150 s, and the reaction rate constant k is 0.0247 s –1 , which are lower than those of Co@NC-600 (Figure S6). This may be due to the low degree of crystallization of Co nanoparticles in Co@NC-500 and the carbon matrix around the Co nanoparticles is unstable . The above results indicate that 600 °C is the optimal carbonization temperature for preparing the catalyst.…”

Section: Results and Discussionmentioning

confidence: 99%

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Synthesis of a Magnetic 2D Co@NC-600 Material by Designing a MOF Precursor for Efficient Catalytic Reduction of Water Pollutants

Wang

Zeng

et al. 2020

Inorg. Chem.

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2D metal–organic framework (MOFs) can be ideal sacrificial templates for fabricating nanomaterials because of active sites exposed on the surface rather than in pores and channels, often exhibiting improved performance in catalysis applications. In this study, the novel 2D layered cobalt-based MOF [Co(TPT)(fma)(H2O)2]·3H2O (Co-MOF) has been constructed by the selection of high N atom content ligands. On this basis, a 2D nitrogen-doped carbon-coated cobalt nanoparticle composite (Co@NC) was prepared by using this MOF as a precursor. Magnetic Co@NC has excellent catalytic activity and recycling features regarding the reaction of 4-nitrophenol (4-NP) reducing to 4-aminophenol (4-AP) in the presence of NaBH4 at ambient temperature. 2D Co@NC-600 can reach nearly 100% conversion within 120 s and its stability remains almost unchanged after five reaction cycles. Moreover, this Co@NC catalyst also is highly active for catalytic reduction of dyes such as Rhodamine B (RhB) and Methylene blue (MB).

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Section: Resultsmentioning

confidence: 78%

Section: Results and Discussionmentioning

confidence: 99%

Synthesis of a Magnetic 2D Co@NC-600 Material by Designing a MOF Precursor for Efficient Catalytic Reduction of Water Pollutants

Wang

Zeng

et al. 2020

Inorg. Chem.

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“…[142] For a long period, the main objects for TEM investigations were only purely inorganic materials, which could survive under high-intensive electron beam, as the latter destroys organic, metal-organic and biological samples within a second. Therefore, the technique was preferentially used for observation growing of nanoparticles, [143] catalytic reactions, [144] surface processes, [145] and liquid chemical reactions. [146] Special stages are designed for imaging of micro-and nanoelectronic devices.…”

Section: In Situ Transmission Electron Microscopy On Mofsmentioning

confidence: 99%

Unraveling Structure and Dynamics in Porous Frameworks via Advanced In Situ Characterization Techniques

Bon

Brunner

Pöppl

et al. 2020

Adv Funct Materials

103

102

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Dynamic metal-organic frameworks (MOFs) represent a subgroup of frameworks featuring unique performance, as they are capable of adapting their pore size and/or the orientation of framework constituents in response to specific guest molecules such as gases or solutes and often outperform their rigid analogus in gas storage, sensing, or separation. In this review, the authors focus on recent methodical developments of advanced in situ diffraction and spectroscopic techniques for comprehensive characterization of porous frameworks. Examples for advanced instrumentation are highlighted for in situ nuclear magnetic resonance, electron paramagnetic resonance, and optical spectroscopies as well as X-ray and neutron diffraction. Several examples of high-resolution transmission electron microscopy (HRTEM) on MOFs are shown because HRTEM is an emerging technique for the characterization of time-resolved structural dynamics in MOFs. These methods shed light on structural features and phase transitions of the host, its spin state, electronic structure, specific host-guest and guest-guest interactions, preferable adsorption sites, and bonding situation in the framework, focusing on the most prominent recent case studies. The synergistic development of novel in situ characterization methods and exploration of well-defined model framework systems are crucial to advance the understanding of dynamic processes in porous materials in future.

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“…Metal–organic frameworks, which are also named porous coordination polymers (PCPs), are crystalline porous materials with periodic network structures formed by metal ions (or metal clusters) and organic ligands . They are usually prepared by solvothermal methods and used as precursors or templates to form nanostructured materials .…”

Section: Introductionmentioning

confidence: 99%

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

et al. 2018

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production, especially for hydroelectricity, sunlight, and wind energy, which cannot be gathered or released when they are needed. [5][6][7][8] Electrochemical energy storage devices provide a promising approach for the storage of electric energy from these sources. [9][10][11] Currently, carbonaceous materials have attracted much interest for their extensive applications including adsorption, [12] catalysis, [13] batteries, [14] fuel cells, [15,16] supercapacitors, [17,18] and drug delivery and imaging. [19] In addition, some sensors are also one of the important applications of carbonaceous materials, because they are closely related to human health. [20,21] For instance, Emran and co-workers [22] constructed ultrasensitive biosensors with N-doped mesoporous carbon (NMC)-based electrodes for in vitro monitoring of DA released from living cells. With the further study of the experiment, they also designed a series of S-doped carbon materials for a wider detection of DA, UA (uric acid), and AA (ascorbic acid). [23,24] The advantages of easy preparing, nontoxic and excellent electrical conductivity of carbonaceous materials, which are rare among energy storage materials, make carbonaceous materials superior to most of the energy storage materials. [25][26][27] There are varieties of approaches for the preparation of carbon materials, such as directly carbonizing from organic precursors, physically or chemically carbonizing from carbon, template methods using zeolites and mesoporous silica, solvothermal and hydrothermal methods with elevated temperature, the electrical arc methods, and chemical vapor decomposition (CVD) methods. [28][29][30][31][32][33][34] Among all these approaches, directly carbonizing from organic precursors is the most frequently used method to prepare nanoporous carbons (NPCs) due to its flexibility and simplicity. [35][36][37] However, these NPC materials present certain drawbacks, such as low surface areas, disordered structures, and ununiformed sizes, which will greatly limit their applications. [25] As studies have progressed, researchers found that carbon materials derived from metalorganic frameworks (MOFs) could overcome these limitations.Metal-organic frameworks, which are also named porous coordination polymers (PCPs), are crystalline porous materials with periodic network structures formed by metal ions (or metal clusters) and organic ligands. [38][39][40][41][42] They are usually prepared by solvothermal methods and used as precursors or templates to form nanostructured materials. [43][44][45] So far, many researchers have highlighted the advantages of MOFs. For Carbon materials derived from metal-organic frameworks (MOFs) have attracted much attention in the field of scientific research in recent years because of their advantages of excellent electron conductivity, high porosity, and diverse applications. Tremendous efforts are devoted to improving their chemical and physical properties, including optimizing the morphology and structure of the carbon materials, compositing them wi...

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Synthesis and application of a MOF-derived Ni@C catalyst by the guidance from an in situ hot stage in TEM

Abstract: Metal–organic frameworks (MOFs) as a class of crystalline porous solids have attracted considerable attention due to their promising potential performance.

Cited by 31 publications

References 45 publications

Synthesis of a Magnetic 2D Co@NC-600 Material by Designing a MOF Precursor for Efficient Catalytic Reduction of Water Pollutants

Synthesis of a Magnetic 2D Co@NC-600 Material by Designing a MOF Precursor for Efficient Catalytic Reduction of Water Pollutants

Unraveling Structure and Dynamics in Porous Frameworks via Advanced In Situ Characterization Techniques

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

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