Rational Design of Ni Nanoparticles on N-Rich Ultrathin Carbon Nanosheets for High-Performance Supercapacitor Materials: Embedded- Versus Anchored-Type Dispersion

Facile Synthesis of A 3D Flower-Like Mesoporous Ni@C Composite Material for High-Energy Aqueous Asymmetric Supercapacitors

A 3D flower-like mesoporous Ni@C composite material has been synthesized by using a facile and economical one-pot hydrothermal method. This unique 3D flower-like Ni@C composite, which exhibited a high surface area (522.4 m²  g^-1 ), consisted of highly dispersed Ni nanoparticles on mesoporous carbon flakes. The effect of calcination temperature on the electrochemical performance of the Ni@C composite was systematically investigated. The optimized material (Ni@C 700) displayed high specific capacity (1306 F g^-1 at 2 A g^-1 ) and excellent cycling performance (96.7 % retention after 5000 cycles). Furthermore, an asymmetric supercapacitor (ASC) that contained Ni@C 700 as cathode and mesoporous carbon (MC) as anode demonstrated high energy density (60.4 W h kg^-1 at a power density of 750 W kg^-1 ).

A new strategy to tailor the structure of sustainable 3D hierarchical porous N-self-doped carbons from renewable biomass for high-performance supercapacitors and CO2 capture

A new method was employed to obtain 3D hierarchical porous N-self-doped carbons with different porous structures from chitosan for high-performance supercapacitors and CO₂ capture without using porogens, catalysts or activators.