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From biological waste to honeycomb-like porous carbon for high energy density supercapacitor
- Wang, Yahui, Zhao, Ziyu, Song, Weiwei, Wang, Zhichao, Wu, Xiaoliang
- Journal of materials science 2019 v.54 no.6 pp. 4917-4927
- Helianthus annuus, capacitance, carbon, electrochemistry, electrodes, electrolytes, energy density, oxygen, potassium hydroxide, surface area, wastes
- We develop a facile and sustainable method for the synthesis of three-dimensional (3D) interconnected honeycomb-like porous carbon (HPC) derived from sunflowers stem. The optimized sample has large specific surface area with 3D interconnected honeycomb-like porous structure and high oxygen content. Due to their synergistic effect, the HPC-2 material shows a high specific capacitance of 349 F g⁻¹ at 1 A g⁻¹, good rate capability (247 F g⁻¹ at 50 A g⁻¹) and excellent cycling stability (retaining 98.6% after 10000 cycles) in 6 M KOH aqueous electrolyte. Moreover, the HPC-2//HPC-2/MnO₂ asymmetric supercapacitor shows a high energy density of 58.8 W h kg⁻¹ and good electrochemical stability (83.1% of initial capacitance retention after 10000 cycles). Therefore, these unique properties enable the material to become a promising high-performance electrode material for supercapacitors.