Issue 33, 2024

Wasted rose-derived porous carbons with unique hierarchical heteroatom-enriched structures as a high-performance supercapacitor electrode

Abstract

High-quality and low-cost activated carbons (ACs) are highly considered as high-performance electrode materials for next-generation supercapacitors. Herein, self-heteroatom-doped nanoporous activated carbon (AC) powders were prepared from wasted rose flowers via two different activation approaches, namely, a typical acidic approach with H3PO4 (AC-T) and a green self-activation approach (AC-S). Based on morphological characterizations, the typical activation method resulted in ACs with a surface area of 1124 m2 g−1, while the ACs prepared by the AC-S method retained the initial hierarchical porous rose structure with a higher surface area of 1556 m2 g−1. High-resolution transmission electron microscopy (HRTEM) images revealed extensive graphitized regions in the porous microstructure of the AC-S powders. Electrochemical analysis results demonstrated an outstanding gravimetric capacitance of 539 F g−1 at 1 A g−1 for AC-S in a three-electrode system. In addition, the prepared electrode with AC-S exhibited excellent stability with 95.4% capacitance retention after 6000 cycles. The symmetric supercapacitor device based on this sample also exhibited a high gravimetric capacitance up to 365 F g−1 and an ultra-high energy density of 50.7 W h kg−1 at a power density of 500 W kg−1.

Graphical abstract: Wasted rose-derived porous carbons with unique hierarchical heteroatom-enriched structures as a high-performance supercapacitor electrode

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
05 May 2024
Accepted
04 Jul 2024
First published
25 Jul 2024

J. Mater. Chem. A, 2024,12, 22045-22060

Wasted rose-derived porous carbons with unique hierarchical heteroatom-enriched structures as a high-performance supercapacitor electrode

A. M. Homayounfard, M. Maleki, H. Banna Motejadded Emrooz, H. Ghanbari, S. Mohammadi and A. Shokrieh, J. Mater. Chem. A, 2024, 12, 22045 DOI: 10.1039/D4TA03118K

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