Issue 11, 2022

Green synthesis of N-doped porous carbon/carbon dot composites as metal-free catalytic electrode materials for iodide-mediated quasi-solid flexible supercapacitors

Abstract

P-Nitroaniline has been adopted as a versatile precursor for the selective preparation of N-doped porous carbon (PC) and carbon dots (CDs) with rich N functionalities. Furthermore, the CDs are anchored on PC to yield PC-CDs composites with the assistance of ultrasonication. Due to the catalytic effect of the pyridinic- and pyrrolic-N sites within the CDs as well as the high specific surface area and conductivity of PC, the optimized PC-CDs-1.5% composite (containing 1.5% CDs) could substantially promote the redox reaction of the acidic KI electrolyte. Therefore, the PC-CDs-1.5%-based supercapacitor demonstrated high specific capacitance (Cs, 1783 F g−1 at 1 A g−1), good rate capability (800 F g−1 at 6 A g−1) and excellent cycling stability (84.7% Cs retention upon 10 000 charge–discharge cycles). Moreover, when employed as the electrode in a flexible supercapacitor, the PC-CDs-1.5% composite also exhibits good capacitive performance in the PVA-H2SO4-KI gel electrolyte, and a high energy density (Ecell) of 13.85 W h kg−1 at a power density (Pcell) of 97.00 W kg−1 is also delivered. In addition, the flexible device shows good electrochemical cycling stability and the Cs of the flexible device could be well maintained under bending and twisting deformations.

Graphical abstract: Green synthesis of N-doped porous carbon/carbon dot composites as metal-free catalytic electrode materials for iodide-mediated quasi-solid flexible supercapacitors

Supplementary files

Article information

Article type
Research Article
Submitted
04 जनवरी 2022
Accepted
03 अप्रैल 2022
First published
07 अप्रैल 2022

Inorg. Chem. Front., 2022,9, 2530-2543

Green synthesis of N-doped porous carbon/carbon dot composites as metal-free catalytic electrode materials for iodide-mediated quasi-solid flexible supercapacitors

R. Wang, H. Wang, Y. Zhou, Z. Gao, Y. Han, K. Jiang, W. Zhang and D. Wu, Inorg. Chem. Front., 2022, 9, 2530 DOI: 10.1039/D2QI00017B

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