Hierarchical structure N, O-co-doped porous carbon/carbon nanotube composite derived from coal for supercapacitors and CO₂ capture

Abstract

The energy and environmental crises have forced us to search for a new green energy source and develop energy storage and environmental restoration technologies.

Coal-Derived Activated Carbon for Electrochemical Energy Storage: Status on Supercapacitor, Li-Ion Battery, and Li–S Battery Applications

“…From the above research studies, we have achieved a good understanding of the interrelationship between the chemistry of active materials such as specific surface area, porosity, and the electrochemical performance of a supercapacitor. Currently, enormous research findings have focused on the design of porous activated carbon from novel electrode materials like coal could bring high specific capacitance with low internal resistance with excellent electrochemical performing supercapacitors, which is the ultimate goal for the energy storage device system. ,− …”

“…With the rapid growth of energy storage devices, a single material will not be able to meet demand, and research into composite material will need to be accelerated. , Hao et al first adopted the functionalization of coal-based porous carbon with carbon nanotubes (CNTs) and ionic liquid to fabricate 3D hierarchical porous structures with N, O codoped porous carbon/carbon nanotubes composites. The optimized product showed a specific surface area of 2164 m 2 g –1 with a high amount of N/O dopants (8.0 and 3 atom %).…”

A high energy flexible symmetric supercapacitor fabricated using N-doped activated carbon derived from palm flowers

“…In addition, the surface modification of carbon materials by hetero atom substitution will greatly affect the physical and chemical properties of the resulting materials. Doping hetero atom 'X' (X= B, N, O, S, F) in carbon matrix can introduce C-X polar bond and improve the wettability of carbon surface [3,[14][15][16][17][18]. Improvement of wettability in turn enhances the conductivity of carbon material and also the contact between electrode and electrolyte.…”

Yeast-Based Porous Carbon with Superior Electrochemical Properties

“…Generally, the former is a common and effective pathway. Chemical activators such as NaOH, KOH, Na 2 CO 3 and K 2 CO 3 are the most commonly used for the preparation of target materials. − However, traditional activators are mostly toxic and corrosive, and it is often etched quantity of the carbon substrate and mass production during activation, which will undoubtedly lead to the collapse of the pore structure, low yield, and broken morphology. − Therefore, one of the promising but challenging research directions is to maintain a large surface area without sacrificing the natural structure of biomass-based carbon during the preparation of porous carbon. New strategies that prepare biomass-derived carbon materials with a good pore structure and high surface area should be continued to be developed.…”