期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137919
关键词
P codoped foamy -like carbons; Osmanthus flowers; Zinc ion hybrid capacitors
资金
- Natural Science Research Project of Department of Education of Anhui Province [KJ2021A1093]
- Scientific Research Startup Funding of Chuzhou University [2020qd51]
N, P codoped foamy-like carbons (NPFC) with abundant defect sites were prepared from osmanthus flowers using a simply and confined pyrolysis method. NPFC exhibited high electrical conductivity and porous structures, providing abundant defects and active sites for ion adsorption and electron transfer. As a cathode material for hybrid capacitors, NPFC showed large energy density and long cycle life in aqueous electrolyte.
To achieve high value-added use of biomass waste is still a big challenge. Besides, heteroatom-doped carbon materials have been charmed enormous interests due to their high conductivity and abundant defect sites. Herein, a simply and confined pyrolysis method is innovated to prepare N, P codoped foamy-like carbons (NPFC) with abundant defect sites from osmanthus flowers. The NPFC features uniform N, P doped, porous structures and big electric conductivity, which provide abundant defects and additional active sites for ion adsorption, shorten ion transfer distance, enhance transfer kinetics and supply highways for electron transfer. As cathode for zinc ion hybrid capacitor (ZHC), NPFC exhibits large energy density (85.7 Wh kg- 1) with long cycle life (remains 97.4% after 20,000 cycles) in aqueous electrolyte. More interestingly, NPFC-based quasi-solid-state ZHC presents extremely big capacity of 163.6 mAh g-1 at 0.1 A g-1 and excellent power density of 35.9 kW kg- 1. This study offers a universal method to synthesize heteroatom-doped carbon materials from biomass waste for hybrid capacitors.
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