Issue 32, 2022

Facile preparation of 3D porous agar-based heteroatom-doped carbon aerogels for high-energy density supercapacitors

Abstract

The fabrication of heteroatom-doped porous carbon materials with high electrical conductivity and large specific surface area via an environmentally friendly route is critical and challenging. Herein, nitrogen and oxygen co-doped agar porous carbon (APC) was developed for supercapacitors via a one-step carbonization method with agar as the raw material and ammonia as the activator and nitrogen source. APC outperformed pectin porous carbon, tamarind porous carbon, and the previously reported carbon-based supercapacitors with a high capacitance retention of 72% even from 0.5 A g−1 to 20 A g−1 and excellent cycling stability in 6 M KOH solution (retained after 10 000 cycles) with a rate of over 98.5%. Furthermore, the APC electrode-based symmetric device exhibited an impressive energy density of 20.4 W h kg−1 and an ultra-high power density of 449 W kg−1 in 1 M Na2SO4 electrolyte together with excellent cycling stability (103.2% primary capacitance retentivity after 10 000 cycles). This study offers a novel method for the synthesis of nitrogen heteroatom-doped hierarchical porous carbon materials for performance-enhanced energy storage devices.

Graphical abstract: Facile preparation of 3D porous agar-based heteroatom-doped carbon aerogels for high-energy density supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
15 Jun 2022
Accepted
04 Jul 2022
First published
21 Jul 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 20975-20982

Facile preparation of 3D porous agar-based heteroatom-doped carbon aerogels for high-energy density supercapacitors

K. Xie, K. Xia, X. Ding, L. Fang, X. Liu and X. Zhang, RSC Adv., 2022, 12, 20975 DOI: 10.1039/D2RA03685A

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