Nitrogen-Doped High Surface Area Porous Carbon Material Derived from Biomass and Ionic Liquid for High-Performance Supercapacitors

Abstract

In this work, bioderived high surface area, porous activated carbons (ACs) are synthesized from dried Sterculia foetida (SF) fruit shells via KOH activation. Further, for highperformance supercapacitor (SC) application, the nitrogen-doped AC (NAC) has been derived by pyrolysis of a nitrogen-enriched ionic liquid (IL) and AC mixture. Herein, aprotic 1-ethyl-3-methyl-imidazolium dicyanamide ([EMIM][DCN]) IL is used as a nitrogen precursor. A series of NACs has been successfully developed by tuning the weight ratio of IL and AC. The optimized NAC (2:1) exhibits suitable graphitization degree, hierarchical micromesopores to ensure effective electrolyte diffusion, high surface area, and enhanced wettability. Further, in a three-electrode configuration, the NAC (2:1) electrode shows a high specific capacitance of 567 F g −1 at 0.5 A g −1 . Moreover, a symmetric two-electrode SC device was constructed, providing excellent specific energy of 13 Wh kg −1 at 300 W kg −1 . Overall, this study presents the positive aspects of an IL as a nitrogen precursor to synthesize high surface area NACs as a promising electrode material for SC applications.

A comparative study on porous activated carbon derived from waste biomass with varying oxygen functionalities as supercapacitor electrodes

“…The CV depicted a rectangular‐shaped plot for both the batches at all the scan rates and current densities, and the GCD appeared a triangle‐shaped plot. These profiles are typically observed for SCs, 4,5 and correspond to capacitive behavior in carbon‐based SCs with fast charging‐discharging capability 32 . The coulomb efficiency of ACRS‐700 is more than 100% at lower current density, for example, at 0.5 A g −1 , which has been discussed in Section S3, Supporting Information.…”

“…These profiles are typically observed for SCs, 4,5 and correspond to capacitive behavior in carbon-based SCs with fast charging-discharging capability. 32 The coulomb efficiency of ACRS-700 is more than 100% at lower current density, for example, at 0.5 A g À1 , which has been discussed in Section S3, Supporting Information. With increase in scan rate, the area of CV curve increases and it is consistent with the Randles-Sevcik equation.…”

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

“…ILs have a wide range of applications. ILs are used as catalysts, − pharmaceuticals, − biopolymer processing, − stabilization of biomolecules, , CO 2 capture, , sensors, antimicrobial, in batteries, as solvents, − in separation and detection of polycyclic aromatic hydrocarbons, and in supercapacitors as electrolyte. , Mainly their use as a solvent has a specific emphasis. In synthesis or any organic reactions, organic solvents are used which are highly volatile, and some are flammable.…”

Borocarbonitride‐Based Emerging Materials for Supercapacitor Applications: Recent Advances, Challenges, and Future Perspectives

“…Graphene has been explored in the doped form with N and B. Their prepared composites, nitrides, [22][23][24][25][26] and borides [27][28][29][30][31][32] have unveiled high theoretical and experimental specific capacitance. The hexagonal boron nitride (h-BN) has followed a line of investigation in its composite form with various metals, materials like poly-aniline, MXenes, etc.…”