Nitrogen-/Boron-Doped Carbon from Poplar Powder and Carbon Nanotube Composite as Electrode Material for Supercapacitors

Abstract

This study presents a relatively easy method to use bioderived carbon material from poplar and carbon nanotubes as electrode materials in supercapacitors. After delignification, poplar powder was intercalated with acidized multiwalled carbon nanotubes, boric acid, and melamine. Subsequently, after carbonization and activation treatment, electrode materials in a supercapacitor exhibiting high electrochemical characteristics were prepared. The obtained multistage porous carbon material achieved a pore volume reaching 0.86 cm3 g–1 as well as a specific surface area reaching 1500.5 m2 g–1. The specific capacitance reached >432.31 F g–1, and the capacitance retention rate was still 95.7% after 3000 cycles of charge and discharge under a current density of 0.5 A g–1. A good power density was achieved by the symmetrical supercapacitor in 6 M KOH electrolyte (11.67 W h kg–1 at 300 W kg–1, 7.74 W h kg–1 at 1485 W kg–1) as well as a remarkable cycle stability (88.3% capacitance retention after 5000 cycles).

Flexible Wood Enhanced Poly(acrylic acid-co-acrylamide)/Quaternized Gelatin Hydrogel Electrolytes for High-Energy-Density Supercapacitors

“…Electrochemical performance of SC-PGW-SINCH at the high potential window. (a) CV curves and (b) GCD profiles within 0–2 V. (c) Ragone plots of SC-PGW-SINCH and performance comparison with previously reported supercapacitors. − (d) CV curves at 50 mV s –1 and (e) GCD profiles at 1.0 A g –1 within different potential windows. (f) Specific capacitances at 1.0 A g –1 within different potential windows (inset: series-connected supercapacitors charge smartphone).…”

Post-modified biomass derived carbon materials for energy storage supercapacitors: a review

“…128,129 Carbon nanotubes have been widely used in biosensors, drug delivery applications, biomedical imaging fields and supercapacitors. 130 Ren 131 proposed a relatively simple method, using biologically derived carbon materials from poplar and carbon nanotubes as electrode materials for supercapacitors. The pore volume of the obtained multi-stage porous carbon material reaches 0.86 cm 3 g −1 and the specific surface area reaches 1500.5 m 2 g −1 .…”

B/P-Codoped Porous Carbon Electrode for Supercapacitors with Ultrahigh Energy Density

“…Inclusion of O atoms is invariably associated with any carbonization process, and hence there is a certain content of O atoms in the carbon samples depending on the carbonization conditions. However, reports on the doping of heteroatoms like B or P into the carbon structures have been relatively rare. − …”