Issue 45, 2022

Preparation of porous biochar and its application in supercapacitors

Abstract

In this study, economical porous biochar was prepared from an apricot shell and used as an electrode material for a supercapacitor, showing excellent capacitance, cycling stability and rate performance. KOH was used as the activator for preparing the biochar, and the effects of different activator concentrations on the specific surface area, pore volume, morphology and the electrochemical properties of the prepared biochar material were investigated. The results showed that increasing the KOH concentration from 0 mol L−1 to 4 mol L−1 changed the surface morphology of the prepared biochar from a smooth and non-porous structure to a porous honeycomb structure. The specific surface area and pore volume of the porous biochar increased first and then decreased and reached a maximum value (2452.7 m2 g−1, and 1.613 cm3 g−1) at a KOH concentration of 3 mol L−1. After assembling the supercapacitor with the prepared biochar, the specific capacitance (Cs) was 216 F g−1 at 0.5 A g−1 and the Cs could still reach a high capacity of 189 F g−1 at 20 A g−1, which was 87.5% of the Cs at 0.5 A g−1. Meanwhile, the assembled supercapacitor showed a high capacity retention rate of 99.5% after 10 000 cycles of charging and discharging at 5 A g−1 and a high energy density of 7.48 W h kg−1 at 125 W kg−1 power density.

Graphical abstract: Preparation of porous biochar and its application in supercapacitors

Article information

Article type
Paper
Submitted
13 Jul 2022
Accepted
24 Oct 2022
First published
26 Oct 2022

New J. Chem., 2022,46, 21788-21797

Preparation of porous biochar and its application in supercapacitors

M. Ding, Z. Ma, H. Su, Y. Li, K. Yang, L. Dang, F. Li and B. Xue, New J. Chem., 2022, 46, 21788 DOI: 10.1039/D2NJ03455G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements