Constructing micropore‐rich nitrogen‐doped carbon for high‐performance supercapacitor and adsorption of carbon dioxide

Abstract

Summary Design of advanced highly porous heteroatom‐doped carbon is desirable for their wide presence in applications like electrochemical energy storage systems, gas adsorption, and separation processes. In this work, porous nitrogen‐doped carbon was developed from ethylenediamine via an in situ self‐doping solvothermal process followed by pyrolysis and KOH activation under high temperature. Micropore‐rich nitrogen‐containing carbon materials were prepared through variation of the KOH/C ratio during activation and their electrochemical performance in alkaline electrolyte as well as CO2 sorption behaviour was evaluated. The porous carbon developed using KOH/C ratio of 2 delivered highest supercapacitor performance in 6 M KOH achieving high specific capacitance of 353 F g−1 with 1 A g−1 of current due to its high pore volume and micropore rich surface. The functionalized carbon delivered CO2 uptake capacities of 4.48 and 3.0 mmol g−1 under temperatures of 273 and 298 K, respectively, at 1 bar pressure with a good CO2/N2 selectivity of 20.58 and CO2/CH4 selectivity of 3.83. The existence of nitrogen functional groups, high surface area, and micropore‐rich porous structures may be the essential reasons behind superior electrode performance and CO2 capture capacity of the material. This work hopefully offers a simple development of N‐doped carbon for effective energy storage and CO2 adsorption systems.

Recent Advances on Nitrogen‐Doped Porous Carbons Towards Electrochemical Supercapacitor Applications

“…[137] According to research conducted by Wei et al, a practical approach utilizing dual-hydroxide activation linked to the self-temple was identified as the most effective method for producing hierarchical NPC using waste shells. [144] The resulting material has a morphology like a honeycomb, an SSA of 246 m 2 g À 1 , a specific capacitance value of 300 F g À 1 , a high graphitization degree, an appropriate doping ratio and stability of 79.8 % over 50000 cycles. These factors collectively contribute to its favorable characteristics of rapid ions/ electron transport, ample charge storage, and notable pseudocapacitance.…”

“…The exceptional supercapacitor response (353 F g À 1 ) was due to successfully tuning the material's structure. [144] Hua et al utilized Zn-bioMOF to synthesize NPC material using the etchants-free method. [150] Etchantfree method refers to a process or technique that does not involve using any etchant or chemical substance that removes material from a surface.…”

“…The materials′ unique composition and properties, including an acceptable distribution of pore sizes and adequate electrochemically active sites, were responsible for these impressive results [137] . According to research conducted by Wei et al ., a practical approach utilizing dual‐hydroxide activation linked to the self‐temple was identified as the most effective method for producing hierarchical NPC using waste shells [144] . The resulting material has a morphology like a honeycomb, an SSA of 246 m 2 g −1 , a specific capacitance value of 300 F g −1 , a high graphitization degree, an appropriate doping ratio and stability of 79.8 % over 50000 cycles.…”

One-Dimensional Ni-MIL-77 Metal–Organic Framework as an Efficient Electrode Nanomaterial for Asymmetric Supercapacitors

“…Although conductive polymers and carbon materials exhibit outstanding rate performance, their applications are constrained by their low specific capacitance. 12 Owing to their impressive specific capacitance and high ED, much research has been done on metal sulfides and oxides as positive electrodes for supercapacitors. 13 However, there are challenges in synthesizing metal-oxide-based high-performance supercapacitors due to their low rate performances, less electrical conductivity, and volume expansion during cycling.…”

“…The performance of supercapacitors is expected to be most significantly enhanced by electrode materials. Although conductive polymers and carbon materials exhibit outstanding rate performance, their applications are constrained by their low specific capacitance . Owing to their impressive specific capacitance and high ED, much research has been done on metal sulfides and oxides as positive electrodes for supercapacitors .…”