We have successfully prepared nanoporous Carbon-L and -S materials by using ZIF-7 as a precursor glucose an additional carbon source. Results indicate that show appropriate nitrogen content, high surface area, robust pore structure excellent graphitization degree. The addition of environmentally friendly source – not only improves the degree samples, but also plays key role in removing residual Zn metal zinc compound impurities, which makes resulting metal-free situ nitrogen-doped porous...

It is still a grand challenge to develop highly efficient nonprecious-metal electrocatalyst replace the Pt-based catalysts for oxygen reduction reaction (ORR). Here, we propose surfactant-assisted method synthesize single-atom iron (SA-Fe/NG). The half-wave potential of SA-Fe/NG only 30 mV less than 20% Pt/C in acidic medium, while it superior alkaline medium. Moreover, shows extremely high stability with 12 and 15 negative shifts after 5,000 cycles media, respectively. Impressively,...

A class of 2D covalent organic polymers (COPs) incorporating a metal (such as Fe, Co, Mn) with precisely controlled locations nitrogen heteroatoms and holes were synthesized from various N-containing metal-organic complexes (for example, metal-porphyrin complexes) by nickel-catalyzed Yamamoto reaction. Subsequent carbonization the metal-incorporated COPs led to formation COP-derived graphene analogues, which acted efficient electrocatalysts for oxygen reduction in both alkaline acid media...

Porous covalent–organic materials (COMs) are a fascinating class of nanoporous material with high surface area and diverse pore dimensions, topologies chemical functionalities. These have attracted ever-increasing attention from different field scientists, owing to their potential applications in gas storage, adsorptive separation photovoltaic devices. The versatile networks constructed covalent bonds (B–O, C–C, C–H, C–N, etc.) between the organic linkers by homo- or hetero-polymerizations....

Nitrogen-coordinated single-atom catalysts (SACs) have emerged as a frontier for electrocatalysis (such oxygen reduction) with maximized atom utilization and highly catalytic activity. The precise design operable synthesis of SACs are vital practical applications but remain challenging because the commonly used high-temperature treatments always result in unpredictable structural changes randomly created single atoms. Here, we develop pyrolysis-free synthetic approach to prepare high...

In this work, metal–organic framework (MOF) UMCM-1 and amino functionalized MOF (i.e., UMCM-1-NH2) were synthesized their performances as luminescent probes investigated. It is found that both unmodified MOFs exhibit a luminescence quenching effect on metal ions. particular, the (UMCM-1-NH2) possesses high sensitivity selectivity for Fe3+ ions completely quenched in 10−3 M DMF solution of Fe3+. Moreover, regenerated UMCM-1-NH2 still has ions, which suggests promising probe selectively sensing iron

Using covalent organic polymer pre­cursors, we have developed a new strategy for location control of N-dopant heteroatoms in the graphitic porous carbon, which otherwise is impossible to achieve with conventional N-doping techniques. The electrocatalytic activities N-doped holey graphene analogues are well correlated N-locations, showing possibility tailoring structure and property carbon nanomaterials. As service our authors readers, this journal provides supporting information supplied by...

Permanent storage: The gas storage capacities of metal–organic frameworks can be increased by incorporation carbon nanotubes and doping the resulting framework with lithium ions (see picture, C turquoise, Cu green polyhedra, Li purple, O red). This combination modifications results in an improvement CO2 CH4 uptakes about 305 % 200 (T=298 K P=18 bar), respectively, compared to unmodified compounds. Detailed facts importance specialist readers are published as "Supporting Information". Such...

We present a rare example of Zeolitic Imidazolate Framework-8 (ZIF-8), Zn(MeIM)2•(DMF)•(H2O)3, as luminescent probes with multi-function sensitivity to detect metal ions and small molecules. Our results show that the luminescence intensity ZIF-8 is strongly sensitive Cu2+ Cd2+ molecules such acetone. In particular, desolvated proportionally decreases concentration Cu2+, while increases owing recognition element-imidazole nitrogen sites. The gradually increase amounts acetone in standard...

A series of carbonized PAF-1s were obtained with enhanced gas storage capacities and isosteric heats adsorption (Qst for short). Especially, PAF-1-450 can adsorb 4.5 mmol g−1 CO2 at 273 K 1 bar. Moreover, it also exhibits excellent selectivity over other gases. On the basis single component isotherm data, dual-site Langmuir–Freundlich model-based ideal solution theory (IAST) prediction indicates that CO2/N2 is as high 209 a 15/85 ratio. Also, CO2/CH4 in range 7.8–9.8 ratio 0 < p 40 bar,...

Abstract Three porous luminescent covalent‐‐organic polymers (COPs) have been synthesized through self‐polycondensation of the monomers tris(4‐bromophenyl)amine, 1,3,5‐tris(4‐bromophenyl)benzene, and 2,4,6‐tris‐(4‐bromo‐phenyl)‐[1,3,5]triazine by using Ni‐catalyzed Yamamoto reaction. All COP materials possess not only high Brunauer–Emmett–Teller (BET) specific surface area about 2000 m 2 g −1 , hydrothermal stability, but also graphene‐like layer texture. Interestingly, COP‐3 COP‐4 show very...

Porous covalent polymers are attracting increasing interest in the fields of gas adsorption, separation, and catalysis due to their fertile synthetic polymer chemistry, large internal surface areas, ultrahigh hydrothermal stabilities. While precisely manipulating porosities porous organic materials for targeted applications remains challenging, we show how a degree diversity can be achieved by incorporating multiple functionalities into single framework, as is done crystalline materials....

Covalent organic frameworks (COFs) are generally obtained as insoluble, cross-linked powders or films, hindering their superior processable properties especially for device implementation. Here, a soluble COF is created with atomically well-organized positive charged centers constrained in the planar direction, exhibiting exceptional solubility through an situ charge exfoliation pathway. Once dissolved, true solution retains homogeneity even after standing over year. Moreover, as-designed...

Recent developments in the design, synthesis and application of 2D covalent organic polymers are reviewed, along with some perspectives challenges.

Abstract The atomic configurations of FeN x moieties are the key to affect activity oxygen rection reaction (ORR). However, traditional synthesis relying on high-temperature pyrolysis towards combining sources Fe, N, and C often results in plurality local environments for sites. Unveiling effect carbon matrix adjacent sites ORR is important but still a great challenge due inevitable connection diverse N as well random defects. Here, we report proof-of-concept study evaluation covalent-bonded...

Covalent organic frameworks (COFs) have recently shown great potential for photocatalytic hydrogen production. Currently almost all reports are focused on two-dimensional (2D) COFs, while the 3D counterparts rarely explored due to their non-conjugated derived from sp

The membrane electrode assembly (MEA) is the core component of proton exchange fuel cells (PEMFCs), which place where reaction occurrence, multiphase material transfer and energy conversion, development MEA with high activity long stability are crucial for practical application PEMFCs. Currently, efforts devoted to developing regulation nanostructure engineering, believed have advantages in improving catalyst utilization, maximizing three-phase boundaries, enhancing mass transport,...

Edge functionalization by selectively attaching chemical moieties at the edge of graphene sheets with minimal damage carbon basal plane can impart solubility, film-forming capability, and electrocatalytic activity, while largely retaining physicochemical properties pristine graphene. The resultant edge-functionalized materials (EFGs) are attractive for various potential applications. Here, a focused, concise review on synthesis EFGs is presented, along their 2D covalent organic polymer (2D...

Computational modelling is a powerful tool for the study of gas–solid interactions, and can be used both to complement experiment design new materials. For gas adsorption by nanoporous media, multiscale approach used, in which molecular force fields required Grand Canonical Monte Carlo (GCMC) simulations are derived from first-principles calculations. This result significantly enhanced accuracy, comparison with conventional empirical field-based GCMC methods. In this article, we review...

Effectively separating CO2 from the natural gas, which is one of alternative "friendly" fuels, a very important issue. A hybrid material CNT@Cu3(BTC)2 has been prepared to separate CO2/CH4 mixture. For comparison separation efficiency, series representative metal–organic frameworks (MOF-177, UMCM-1, ZIF-8, MIL-53 (Al), and Cu3(BTC)2) have also synthesized by solvothermal method. Adsorption isotherms CH4 pure gases are measured Hiden Isochema Intelligent Gravimetric Analyzer (IGA-003). The...

Reducing anthropogenic carbon dioxide emission has become an urgent environmental and climate issue of our age. Here, a series covalent-organic polymers (COPs) are synthesized, the adsorption properties these COPs for H2, CO2, CH4, N2 O2 studied. The H2 uptake COP-2 reaches 1.74 wt% at 77 K 1 bar, which is among highest reported uptakes in field microporous organic under similar conditions, CO2 CH4 capacities 594 mg g−1 78 g−1, respectively, 298 18 bar. Then, based on single component...

Highly efficient electrocatalysts derived from metal-organic frameworks (MOFs) and covalent organic (COFs) for oxygen reduction reaction (ORR) have been developed. However, the subsequent pyrolysis is often needed owing to their poor intrinsic electrical conductivity, leading undesirable structure changes destruction of original fine structure. Now, hybrid were formed by self-assembling pristine polymer (COP) with reduced graphene oxide (rGO). The conductivity hybridized COP/rGO materials...

Highly efficient electrocatalysts are vital to meet energy and environmental challenges. Although numerous nonprecious metal or metal-free carbon-based catalysts have been demonstrated entirely partially replace noble-metal-based electrocatalysis, the absence of precise design a predictable process hindered development. Well-defined 2D covalent organic polymers (COPs) as new exciting type electrocatalyst presented superior potentials with precisely controllable capacities, such robust...

The output energy capacity of green electrochemical devices, e.g., fuel cells, depends strongly on the sluggish oxygen reduction reaction (ORR), which requires catalysts. One desired features for highly efficient ORR electrocatalytic materials is richness well-defined activate sites. Herein, we developed a facile approach to prepare nonprecious metal and nitrogen-doped carbon-based catalysts based covalent organic polymers (COPs) synthesized in situ nanoconfined space ordered frameworks...