Journal
JOURNAL OF ENERGY STORAGE
Volume 41, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.102988
Keywords
Biomass; Ionic liquid; Hierarchical porous carbon; Supercapacitor; High specific energy
Categories
Funding
- National Natural Science Foundation of China [21873026, 21573058, 21573061]
- Education Department of Henan Prov-ince [18A150031]
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In this study, carbon material with hierarchical porous structure derived from honeysuckle flowers showed high specific capacitance in IL electrolyte. The assembled symmetric SCs exhibited high specific energy at specific power and maintained superior cyclability, demonstrating the potential of honeysuckle flowers as a sustainable carbon source for efficient electrode materials in high-performance supercapacitors.
As an electrode material, biomass-derived porous carbon has been extensively investigated for supercapacitors (SCs) due to its abundant resources, low cost, and sustainability. It is an important strategy to boost the energy capacity of SCs by using high-capacitance electrodes and widening electrochemical stability potential window (ESPW). In this work, a carbon material with hierarchical porous structure has been prepared by using honeysuckle flowers as the raw material and KOH as the chemical activator. The porous size distribution can be easily controlled by regulating the dosage of KOH to match the size of ionic liquid (IL) electrolyte. The honeysuckle derived carbon (HC) electrode material exhibits a high specific capacitance of 186 F g(-1) at 1 A g(-1) in 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF4) IL electrolyte. Moreover, the assembled symmetric SCs can provide a high specific energy of 93 Wh kg(-1) at a specific power of 954 W kg(-1), and its specific energy still remains 64 Wh kg(-1) at 23 kW kg(-1). Benefiting from the persevering architecture, the fabricated SCs also show a superior cyclability (83% of its initial value after 7500 cycles). Consequently, the investigation proves honeysuckle flowers are a promising sustainable carbon source for producing efficient electrode materials of high-performance supercapacitors.
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