High performance supercapacitor electrodes based on B/N Co-doped biomass porous carbon materials by KOH activation and hydrothermal treatment. (13th September 2021)

• Record Type: Journal Article
• Authors: Luo, Lu; Luo, Lingcong; Deng, Jianping; Chen, Tingting; Du, Guanben; Fan, Mizi; Zhao, Weigang
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 63(2021)
• Page Start: 31927
• Page End: 31937
• Publication Date: 2021-09-13
• Subjects: Boron-nitrogen co-doping -- Hierarchical porous carbon -- Post-treatment -- Supercapacitor -- Energy storage; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.06.211
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The N and B co-doped hierarchical porous carbon with excellent textured properties by using two-step of activation and hydrothermal post-treatment process using ammonium pentaborate tetrahydrate (NH4 B5 O8 ·4H2 O) as both nitrogen and boron source are developed. The results showed that BNAC-3 has the maximum surface area (2471 m 2 /g) caused by the highest degree of micro/mesopores (0.82 and 0.35 cm 3 /g) and the linked 3D network are advantageous for the circulation of electrolytes and electrostatic adsorption. The contribution of Faradaic pseudocapacitance may be caused by high B (3.12 wt percent) and N (2.02 wt percent) contents of BNAC-3. Additionally, BNAC-3 exhibits excellent electrochemical efficiency with an ultra-high specific ability of 369 F/g at 1 A/g current density (CD) and maintains 240 F/g at 20 A/g in three-electrode systems. Notably, in a two-electrode device, maximum energy density can be almost 12.0 W h/kg at a power density (PD) of 375 W/kg. Graphical abstract: Image 1 Highlights: Both B and N have been successfully doped into the carbon framework. Excellent electrochemical performance of 369 F/g at 1.0 A/g were obtained. An assembled supercapacitor shows energy density of 12.0 W h/kg at the power density of 375 W/kg. The capacitance was retained at 99.0% after 10, 000 charge-discharge cycles at 10 A/g.