Synthesis of a Novel Petal‐Shaped Biomass‐Derived Carbon Material with Controlled Pore Structure and Nitrogen Content for Use in Supercapacitors

Abstract

Controllably adjusting the porosity and the heteroatom content has become extremely attractive for increasing the energy storage capacity of carbon materials. In this work, petal‐shaped N‐doping carbon materials with super‐high specific surface area (2752 m2 g−1) and enriched micropores (90.1 %) have been synthesized by using renewable spikes of terminalia catappa as raw materials via a facile and feasible method. The results confirmed that the prepared N‐doping carbon material exhibits outstanding electrochemical performances. The specific capacitance reaches up to 503 F g−1 at 0.5 A g−1 and 306 F g−1 at 50 A g−1; cycling stability maintains 100.2 % after 10000 cycles. The fabricated symmetric supercapacitor shows an attractive energy density of 30.5 W h Kg−1 at a power density of 492.4 W Kg−1 in 1 M Na2SO4 electrolyte. Moreover, this study opens up a new way to enhance the micropore proportion and N content of carbon materials and displays the unique petal‐shaped nano‐flakes morphology that can maximally expose the surface of carbon materials.

Preparation of porous carbon by physical-chemical activation for high-performance supercapacitors

“…Porous carbon as one of the main supercapacitor electrode materials has many advantages such as large specific surface area, well-developed pore structure and excellent electrical conductivity [1][2][3].However, commercial carbon electrode materials usually result in low energy densities of supercapacitors, cannot meet the growing power demand of mobile electronics and new energy vehicles [4]. Hierarchical pore carbon with abundant ion storage sites and fast ion transport channels can provide high energy densities and power densities for the double layer capacitor.…”

Tobacco‐Stem‐Derived Nitrogen‐Enriched Hierarchical Porous Carbon for High‐Energy Supercapacitor

“…Among all precursors for NHPCs, biomass has been extensively concerned to prepare NHPC for SCs due to sustainability, low cost and heteroatom‐enrich [12] . Humic acids, [5b] bean dregs, [7a] bamboo bagasse, [7b] gelatin [2b] were used to prepare carbon materials for SCs. As an common economic crop, the main components of tobacco are lignin and cellulose, which make tobacco suitable for the preparation of porous carbons.…”