N‐Doped Porous Carbon Derived from Solvent‐Free Synthesis of Cross‐Linked Triazine Polymers for Simultaneously Achieving CO₂ Capture and Supercapacitors

Abstract

It is highly desirable to design advanced heteroatomic doped porous carbon for wide application. Herein, Ndoped porous carbon (NPC) was developed via the fabrication of high nitrogen cross-linked triazine polymers followed by pyrolysis and activation with controllable porous structure. The as-synthesized NPC at the pyrolysis temperature of 700°C possessed rich nitrogen content (up to 11.51 %) and high specific surface area (1353 m 2 g À 1 ), which led to a high CO 2 adsorption capability at 5.67 mmol g À 1 at 298.15 K and 5 bar pressure and excellent stability. When the activation temperature was at 600°C, such NPC exhibited a superior electrochemical performance as anode for supercapacitors with a specific capacitance of 158.8 and 113 F g À 1 in 6 M KOH at a current density of 1 and 10 A g À 1 , respectively. Notably, it delivered an excellent stability with capacity retention of 97.4 % at 20 A g À 1 after 6000 cycles.

Single-Step Preparation of Ultrasmall Iron Oxide-Embedded Carbon Nanotubes on Carbon Cloth with Excellent Superhydrophilicity and Enhanced Supercapacitor Performance

“…The Raman spectrum of FeO−CNT-20 (Figure S1) shows three peaks at 221, 255, 290, and 485 cm −1 , 20,21 implying the formation of Fe 2 O 3 , and two broad peaks at 1368 and 1592 cm −1 , corresponding to the D and G bands, respectively. 37,38 The intensity ratio of the D to G band (I D / I G ) is determined to be 0.91, higher than that of previous reported CNTs, 28,39,40 suggesting defective CNTs with an unordered structure. The generation of disordered and defective CNTs is due to the relatively low combustion 32,41 Notably, the O 2− of Fe 2 O 3 has a large proportion of 42%, which is much higher than the previous reported Fe 2 O 3 /CNTs that were directly obtained under the inert atmosphere.…”

“…The peaks at 33.2, 35.6, 49.5, and 62.4° are ascribed to (104), (110), (024), and (214) of α-Fe 2 O 3 , respectively. ,, Notably, the characteristic peak of γ-Fe 2 O 3 cannot be detected, which is possibly due to the poor crystallinity under such low temperature combustion. The Raman spectrum of FeO–CNT-20 (Figure S1) shows three peaks at 221, 255, 290, and 485 cm –1 , , implying the formation of Fe 2 O 3 , and two broad peaks at 1368 and 1592 cm –1 , corresponding to the D and G bands, respectively. , The intensity ratio of the D to G band ( I D / I G ) is determined to be 0.91, higher than that of previous reported CNTs, ,, suggesting defective CNTs with an unordered structure. The generation of disordered and defective CNTs is due to the relatively low combustion temperature under the air atmosphere compared with the traditional CVD technologies.…”

Nitrogen-Doped Porous Carbon Materials Derived from Graphene Oxide/Melamine Resin Composites for CO2 Adsorption

“…Up to now, two commonly used ways have been reported to synthesize the NPCM, one is direct pyrolysis and activation of nitrogenous organic precursors, the other is to introduce nitrogen element by using nitrogenous activating agents during the activation at elevated temperatures [16][17][18][19]. Because the nitrogen is derived from the precursor itself, the former method is more conducive to the formation of abundant nitrogen species in the framework of the NPCM.…”

MWCNT Decorated Rich N-Doped Porous Carbon with Tunable Porosity for CO2 Capture

“…In addition, P-phenylenediamine grafted onto MWCNTs showed a 250% improvement of CO 2 adsorption, and the CO 2 adsorption capacity reached 0.59 mmol g −1 at 303.15 K and 200 kPa [ 17 ]. Recently, much attention was focused on N-doped porous carbons (NPCs), due to their large surface area and dense active nitrogen with negative charge, which can offer more active sites for CO 2 uptake [ 18 , 19 , 20 ].…”