Oxygen reduction using a metal-free naphthalene diimide-based covalent organic framework electrocatalyst

Abstract

A novel naphthalene diimide-based covalent organic framework (NDI-COF) has been synthesized and successfully exfoliated into COF nanosheets (CONs) to provide an efficient electrocatalyst for the oxygen reduction reaction.

In silico design of 2D polymers containing truxene-based platforms: insights into their structural and electronic properties

“…It is worth noting that most of the first-principles theoretical frameworks adopted here have been very recently used to rationalize similar compounds, such as the first example of a solidstate fluorescent 2D-COF bonded via imine linkage 37 or highlyefficient metal-free COF catalysts towards the oxygen reduction reaction and hydrogen evolution processes. 43 Taking advantage of this not-yet-fully-harvested theoretical workbench, this exhaustive and systematic study provides a powerful protocol for prefiltering of novel candidate materials towards different potential application fields according to the targeted functionality.…”

Nanoscale covalent organic frameworks as theranostic platforms for oncotherapy: synthesis, functionalization, and applications

“…151 Some examples for the preparation of NCOFs by ultrasonic exfoliation are shown in Table 2. [150][151][152][153][154][155][156][157][158][159][160][161][162][163][164][165] Evidently, the weaker the interactions between the COF layers, the easier it becomes to perform ultrasonic exfoliation. TPA-COF constructed with tris(4-aminophenyl)amine and tris(4-formylphenyl)amine exible monomers with the C 3v symmetry conrmed this prediction.…”

Design and Synthesis of Polyimide Covalent Organic Frameworks

“…The tube sealing method is carried out under more extreme conditions, and usually requires that the precursor molecules have good solubility in the solvent in order to obtain crystals of good quality The crystals obtained by this method have exceptional crystallinity, but it requires a long reaction period and it is rarely used for large-scale synthesis. In recent years, researchers have been working hard to explore low-cost and large-scale synthesis methods, such as solvothermal synthesis, [17,18,26,27,41,42,44,46,48] condensation polymerization synthesis, [25,45] high-temperature solid-state synthesis, [39] interfacial synthesis, and ionothermal synthesis. [40,45]…”

“…As for applications, there are fewer reports on PI-COFs, mainly because the current types of PI-COFs are fewer and the synthesis method is more stringent, which limit its further development. However, compared with amorphous porous PI materials only used in gas adsorption and separation (Table 1), crystalline PI-COFs can be used in adsorption and separation, [17,18,45] drug delivery, [26] solar-to-electrochemical energy storage, [25] sensing, [27,39] photocatalysis, [42] electrocatalyst, [44,48] and other fields.…”

“…Besides, a newly discovered material, naphthalene diimide‐based covalent organic framework nanosheets (NDI‐CONs), whose naphthalimide unit can be used as an efficient electrocatalyst for oxygen reduction in alkaline media. [ 44 ] Compared with the previous catalysts, the naphthalene diimide‐based covalent organic framework (NDI‐COF) has the advantage that it is not only metal‐free, but also free of an additional pyrolysis process before use. In this article, the author also studied the role of the ordered structure of COF in the electrochemical process.…”