Facile Preparation and Improved Electrochemical Performance of Oxygen‐Enriched Porous Carbon Materials Based on Diacetal‐Containing Polybenzoxazine

Abstract

Porous oxygen-doped carbon materials based on the copolymers of a diacetal-type benzoxazine (ACE-a) and melamine with different ratios are prepared by a facile template-free method. The oxygen-rich diacetal structure in ACE-a allowed for a high oxygen content of 66.2% in surface in these porous carbon materials, and the degradation of the melamine at a high temperature gave an ideal pore structure with a specific surface area of 1383.9 m 2 g −1 and a pore capacity of 0.748 cm 3 g −1 . The electrochemical performances are analyzed by Cyclic voltammetry (CV) and Galvanostatic charge-discharge (GCD) tests, and the effects of melamine contents and electrolyte types are also investigated. The results suggested that this material possessed specific capacitance of 430 F g −1 in 0.5 M H 2 SO 4 and 194 F g −1 in 6 M KOH (0.5 A g −1 ), respectively, and showed excellent charge-discharge behavior and magnification characteristic. Moreover, the copolymerization reactions, crosslinking structures, and degradation process of the benzoxazine/melamine copolymers are studied by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis-infrared spectrometry (TGA-IR), respectively. This kind of oxygen-enriched porous carbon material has a good applicative prospect in the field of supercapacitor.

Robust Nitrogen-Doped Microporous Carbon via Crown Ether-Functionalized Benzoxazine-Linked Porous Organic Polymers for Enhanced CO2 Adsorption and Supercapacitor Applications

“…Using 1 M KOH as the electrolyte, glassy carbon, platinum wire, and Hg/HgO served as the working electrode, counter electrode, and reference electrode, respectively. The sample was coated on the working electrode, and cyclic voltammetry (CV) was conducted at 5–200 mV s –1 for Cr-TPA-4BZ-Py-POP, poly(Cr-TPA-4BZ-Py-POP)-700, and poly(Cr-TPA-4BZ-Py-POP)-800 within the voltage range of 0 to −1.0 V. The resulting CV curves, as depicted in Figures (a,b) and S6(a), exhibit a standard rectangular shape indicative of electric double-layer capacitance (EDLC). − Notably, the redox peaks observed in all CV plots are attributed to faradaic redox currents induced by heteroatoms. Given the EDLC behavior and rectangular shape of poly(Cr-TPA-4BZ-Py-POP)-700 and poly(Cr-TPA-4BZ-Py-POP)-800 observed in the galvanostatic charge–discharge (GCD) curves [Figures (c) and S6(b)], GCD measurements across a range of 0.5–20 A g –1 revealed a capacitance value of 354.41 and 397.2 F g –1 at 0.5 A g –1 for poly(Cr-TPA-4BZ-Py-POP)-700 and poly(Cr-TPA-4BZ-Py-POP)-800 [Figures (d) and S6(c)].…”

Preparation and Properties of a Phosphorus-Free Intrinsic Flame-Retardant and High Thermal Resistant Polybenzoxazine with Good Degradability

“…They can undergo ring-opening polymerization upon heating or with the aid of a catalyst, resulting in a cross-linking network with a Mannich bridge structure. Compared to phenolic resin, benzoxazines possess a flexible molecular design, negligible release of byproducts during the curing process, minimal volume shrinkage, low dielectric properties, good mechanical properties, and high char yield. − Similar to other thermosetting resins, benzoxazine resins also face the degradation issue. To address this, some researchers have concentrated on incorporating the unstable structures into benzoxazines to achieve degradability.…”