Biomass waste-derived mesopore-dominant porous carbon for high-efficiency capacitive energy storage

Mesopore-dominant porous carbon was fabricated from poplar catkin bio-wastes with a facile and mild one-pot strategy. Some fabrication parameters (i.e., H3PO4 dosage and activation temperature) were optimized based on the capacitive behavior of the obtained materials. The optimal carbon (denoted as PCC-3-60 0), which was prepared under the conditions of H3PO4 solution (15.0 wt%) 3 mL and activation temperature 600 degrees C, achieved a specific capacitance of 316.5 F g(-1) at a current density of 0.5 A g(-1) and still kept as 182.0 F g(-1) at 20.0 A g(-1) in the three-electrode configuration. The PCC-3-600//PCC-3-60 0 symmetric device provided an appealing energy density (E) of 25.93 Wh kg(-1) with the power density (P) of 240 W kg(-1), and maintained as high as 15.33 Wh kg(-1) with P = 8000 W kg(-1). Aside from this, the assembled symmetric configuration delivered excellent cycling stability with a 103.67% retention in capacitance even in the 30,000th cycle at 1.0 A g(-1). Compared with many carbon materials in literature, the obtained PCC-3-60 0 provides superior capacitive energy storage behavior, which is presumably due to its unique mesoporedominant porous structure with a large surface area of 2011 m(2) g(-1) as well as the presence of heteroatoms (i.e., N, O and P). Our work paves a facile avenue for the efficient usage of bio-wastes in advanced electric energy storage devices. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

In this study, mesopore-dominant porous carbon was fabricated from poplar catkin bio-wastes using a facile and mild one-pot strategy, with optimized fabrication parameters leading to superior capacitive energy storage behavior. The carbon material exhibited high specific capacitance, energy density, power density, and cycling stability, making it a promising candidate for advanced electric energy storage devices.