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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. [ABSTRACT FROM AUTHOR]

Correction for 'Wasted rose-derived porous carbons with unique hierarchical heteroatom-enriched structures as a high-performance supercapacitor electrode' by Amir Mahdi Homayounfard et al., J. Mater. Chem. A, 2024, 12, 22045–22060. [ABSTRACT FROM AUTHOR]