Rose-petals-derived hemispherical micropapillae carbon with cuticular folds for super potassium storage

Potassium-ion batteries (PIBs) have attracted tremendous attention in emerging energy storage, while carbonaceous anode materials challenged by low specific capacity and poor cycling stability. Herein, hemispherical micropapillae carbon with cuticular folds (HMC@CFs) derived from rose petals is prepared as anode for PIBs. The HMC@CFs architecture provides a hemispherical micropapillae, stable and dense cuticular folds, loose lamellar interlayer and in-situ N-S codoping. When applied as anode for PIBs, the HMC@CFs delivers a high reversible capacity of 288.8 mAh g(-1) at 100 mA g(-1) and a good cycling stability at 500 mA g(-1) over 800 cycles with a capacity retention as high as 92.5%. Besides, a high discharge capacity of 134.6 mAhg(-1) at a high current density of 1000 mA g(-1) is achieved. This work provides a cost-effective and sustainable strategy to fabricate carbon-based materials as electrode for super potassium storage and other energy storage systems. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

The study prepared carbon materials with HMC@CFs structure derived from rose petals as the anode for potassium-ion batteries, showing excellent reversible capacity and cycling stability. The research provides a cost-effective and sustainable new strategy for fabricating carbon-based materials as electrode for super potassium storage and other energy storage systems.