High-performance supercapacitor based on self-heteroatom-doped porous carbon electrodes fabricated from Mikania micrantha

Abstract

Applications, economic advantage, and effective waste management have sparked much interest in porous carbon compounds synthesized from renewable and biowaste resources. Self-heteroatom-doped carbon compounds have recently been made using various biological precursors. This study investigates the ease of preparing biomass-derived porous carbon (BPC) matrices from raw and verdant Mikania micrantha leaves using a direct activation and pyrolysis procedure. With the aid of preactivation and pyrolysis, BPC materials can be synthesised with a high surface area and pore volume. At a current density of 1 A/g, the BPC materials MM-700 exhibit a speci c capacitance of 393 F/g. Interestingly, the MM-700 BPC materials have a greater capacitive contribution to charge accumulation during the electrochemical reaction. The BPC material MM-700 solid-state device manufactured with a PVA-H 2 SO 4 gel electrolyte has a speci c capacitance of 119 F/g at 1 A/g current density and a power density of 13,284 kW/kg at 30 A/g current density. Even at a high current density of 30 A/g, the synthesized porous carbon materials retain a high speci c capacitance. Moreover, the MM-700 BPC material exhibits outstanding stability in both three-and two-electrode systems in strong acidic electrolyte.

Oxygen-rich hierarchical porous carbon nanosheets derived from the KOH/KNO3 co-activation treatment of soybean straw for high-performance supercapacitors

“…In recent years, the conversion of biomass into carbon nanomaterials with a large specific surface area for electrical energy storage via simple chemical treatment has received significant attention because of is high compatibility with the concept of green chemistry, typically involving three steps of “pyrolysis-carbonization-activation”. 15–17 Moreover, the natural texture of biomass can be utilized as a template to replicate the target product, resulting in the formation of a well-organized structure. 18 With the advancement of synthetic techniques, a two-step or even one-step conversion method has been successfully developed recently to construct the target products with a shorter treatment period, reduced preparation cost, and improved utilization rate of raw materials.…”

Mn Cluster-Embedded N/F Co-Doped Carbon toward Mild Aqueous Supercapacitors

“…At present, intensive research has been conducted in transition metal oxides, hydroxide, and sulfide electrode materials [7][8][9]. Among them, carbon materials stand out as potential electrode materials for supercapacitors, offering the dual advantages of exceptional electrical conductivity and cost-effectiveness [10][11][12]. However, the electric double-layer energy storage mechanism prevents the carbon material application in various scenarios, especially in the field of high-energy storage [13].…”