Preparation of Nitrogen and Sulfur Co‐doped and Interconnected Hierarchical Porous Biochar by Pyrolysis of Mantis Shrimp in CO₂ Atmosphere for Symmetric Supercapacitors

Abstract

A porous functional biochar (MSCs) rich in N and S heteroatom doping was prepared by pyrolyzing mantis shrimp shells as the biomass source of the typical processing seafood waste in CO2 atmosphere. The physical and chemical properties of carbon materials were adjusted by the control of the pyrolysis temperature. In this study, maximum specific surface area (SSA) and pore volume of 484.5 m2 g−1 and 0.291 cm3 g−1, respectively of the MSCs material were reached at 700 °C. Moreover, it was found in the characterization test that heteroatoms, such as N and S were successfully introduced into the carbon microstructure. MSC‐750 contains N of up to 9.46 % and 0.52 % of S. Although its SSA is only 431.6 m2 g−1, the specific capacitance of the 6 M KOH symmetrical supercapacitor at 1 A g−1 reaches the maximum value of 144.2 F g−1 among all samples due to the pseudocapacitance generated by its high content of heteroatomic functional groups.

N/O Co-doped hierarchical nanoporous biochar derived from waste polypropylene nonwoven for high-performance supercapacitors

“…13,14 Amongst them, functionalized porous biochar has gained much attention owing to it advantages of wide in raw materials, easy to modify, and high sustainability. 15,16…”

“…13,14 Amongst them, functionalized porous biochar has gained much attention owing to it advantages of wide in raw materials, easy to modify, and high sustainability. 15,16 Doping with heteroatoms (N, O, P, and S) can further improve the specic capacitance and cyclic stability of carbon materials. 17,18 The presence of heteroatoms affects the electrochemical interfacial state and electric double-layer capacitive properties of carbon materials.…”

Lignin-Based/Polypyrrole Carbon Nanofiber Electrode With Enhanced Electrochemical Properties by Electrospun Method

“…However, porous carbon has gained wide raw material sources, low cost, well-developed pores, and an easy-to-control structure ( Li et al, 2020 ). Moreover, the large amount of oxygen functional groups such as -OH and -COOH in these materials as another advantage provided interesting attention for better superior charge storage ( Ding et al, 2021 ). Like the latest report, Xu et al (2022 ) prepared dung beetle forewing carbon materials with a hierarchical porous structure, self-doped nitrogen, oxygen, and a large specific surface area, which obtained a specific capacitance of 348 F g −1 .…”