Metal-free covalent organic frameworks containing precise heteroatoms for electrocatalytic oxygen reduction reaction

Abstract

Covalent organic frameworks (COFs) have been used for electrocatalytic oxygen reduction reaction (ORR) due to their structural tunability, well-defined electroactive sites, and easy introduction of heteroatoms. Researchers have incorporated heteroatoms...

Metal‐Free Covalent Organic Frameworks for the Oxygen Reduction Reaction

“…Apart from the S atoms, Se and O atoms were also introduced into periodic benzotrithiophene‐based COFs (JUC‐616, JUC‐617 and JUC‐618; Figure 4). [30] All synthesized COFs displayed the high crystallinity and adopted AA stacking models, and the main peaks located at 3.96, 4.59, 6.05, 7.91, and 25.04 from the 110, 200, 210, 220, and 001 facets, respectively. The BET surface areas for JUC‐616, JUC‐617 and JUC‐618 were 893, 943 and 630 m 2 g −1 , respectively.…”

Tailoring Thiazole Decorated Polymer with Benzoselenadiazole for Enhanced SO2 Sensing

“…The binding energy peak at 56.6 eV is attributed with the 3d 5/2 of benzoselenadiazole ring in BBTBSe CP. 46 This highresolution XPS spectrum of Se shows the presence of Se and N−Se−N bond in BBTBSe CP (Figure S5a). 47,48 The deconvoluted S spectrum consists of two binding energy peaks at 163.1 and 164.3 eV, which are ascribed to C−S−C.…”

“…53,54 However, electronegativity difference among carbon, sulfur, and selenium also impacts the binding energies of nitrogen, highlighting the different chemical interactions and bonding of nitrogen. 46 The XPS spectra indicate the presence of Se, S, N, and C elements in BBTBSe CP and S, N, and C elements in BBT CP. SO 2 Sensing Performance.…”

Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

“…Fang and co-workers recently studied the effect of multi-heteroatom doping in polymer catalysts on the electrocatalytic ORR performance. 59 As given in Fig. 5f, three different benzotrithiophene-based polymer catalysts (JUC-616, JUC-617, and JUC-528) containing multiple heteroatoms were constructed by changing the secondary building blocks via Schiff-base condensation reaction.…”