Ultra‐High Surface Area Nitrogen‐Doped Carbon Aerogels Derived From a Schiff‐Base Porous Organic Polymer Aerogel for CO₂ Storage and Supercapacitors

Abstract

Nitrogen-doped carbon aerogels (NCAs) have received great attention for a wide range of applications, from thermal electronics to waste water purification, heavy metal or gas adsorption, energy storage, and catalyst supports. Herein NCAs are developed via the synthesis of a Schiff-base porous organic polymer aerogel followed by pyrolysis. By controlling the pyrolysis temperature, the polymer aerogel can be simply converted into porous NCAs with a low bulk density (5 mg cm −3 ), high surface area (2356 m 2 g −1 ), and high bulk porosity (70%). The NCAs containing 1.8-5.3 wt% N atoms exhibit remarkable CO 2 uptake capacities (6.1 mmol g −1 at 273 K and 1 bar, 33.1 mmol g −1 at 323 K and 30 bar) and high ideal adsorption solution theory selectivity (47.8) at ambient pressure. Supercapacitors fabricated with NCAs display high specific capacitance (300 F g −1 at 0.5 A g −1 ), fast rate (charge to 221 F g −1 within only 17 s), and high stability (retained >98% capacity after 5000 cycles). Asymmetric supercapacitors assembled with NCAs also show high energy density and power density with maximal values of 30.5 Wh kg −1 and 7088 W kg −1 , respectively. The outstanding CO 2 uptake and energy storage abilities are attributed to the ultra-high surface area, N-doping, conductivity, and rigidity of NCA frameworks.

A Carbocationic Triarylmethane‐Based Porous Covalent Organic Network

“…PowderX -ray diffraction( PXRD) analysiss hows al ow crystallinity profile for RIO-70 ( Figure 2d). Similarb ehavior was reported by Liao et al [21,22] for other polymericm aterials based on pararosaniline base dye. The as-synthesized material presented two broad peaks in 2q % 6.38 and 2q % 118,t hat may be assigned to the (100) and (2-10) planes, respectively,b ased on the simulated structures with AA packing.T wo broad peaks are also observed at 2q % 208 and 2q % 258,w hich is consistent with the plane (001) of non-ionized and ionizedf orms of RIO-70,r espectively.T he low crystallinity may be due to turbostratic disorder and smallc rystallites, both typical of 2D CONs.…”

High performance fully paper‐based all‐solid‐state supercapacitor fabricated by a papermaking process with silver nanoparticles and reduced graphene oxide‐modified pulp fibers

“…As shown in Figure 3A, the cyclic voltammetry (CV) curve of Ag‐Cell/RGO‐Cell paper presents a quasi‐rectangular shape, demonstrating the formation of electrolytic double layer capacitance, 53,54 while the inset‐area of the CV curves of RGO‐Cell paper and Ag film/RGO‐Cell paper decreased obviously. The area of the CV curve represents the capacitance of the electrode 55,56 . So, the results confirm the effect of Ag‐modified fibers as the 3D current collector on the electrochemical performance of RGO on the surface of cellulose fiber.…”

Recent advances in carbon-based supercapacitors

“…14,128 Conjugated polymer networks assembled via the covalent bonding of multifunctional aromatic building blocks allow a wealth of choices of heteroatom incorporations with targeted locations, and the intensive inter-/intrachain p-p interactions of the robust conjugated skeleton guarantee smooth conversion into porous carbon nanoarchitectures by direct calcination. 15,65,[129][130][131][132] Wang's group fabricated a novel class of multi-heteroatomdoped porous carbons based on the in situ dehalogenation of heteroatom-containing nucleophiles with halogenated conjugated dienes (Fig. 9b).…”