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Synergistic effect of porous structure and heteroatoms in carbon materials to boost high‐performance supercapacitor
Author(s) -
Zhu Chen,
Liu Ying,
Zhang Haonan,
Yang Hao,
Yin Xitao,
Li Zhigang,
Ma Xiaoguang
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6579
Subject(s) - heteroatom , supercapacitor , carbon fibers , materials science , power density , hydrothermal circulation , sulfur , electrochemistry , chemical engineering , capacitance , etching (microfabrication) , electrode , nitrogen , porosity , doping , hydrothermal synthesis , analytical chemistry (journal) , nanotechnology , chemistry , composite material , optoelectronics , organic chemistry , metallurgy , composite number , engineering , ring (chemistry) , power (physics) , layer (electronics) , quantum mechanics , physics
Summary In this work, the porous carbon (PC) materials with nitrogen and sulfur atoms doping (PC‐NS) are prepared by KOH activation and a hydrothermal process. Among them, the biomass (fig seeds) is used as carbon precursors, the KOH etching process is controlled to optimize pores of PC‐NS materials; the hydrothermal reactions introduce nitrogen and sulfur atoms to modify the carbon materials. Results show that the PC‐NS‐3 (the ratio of fig seeds to KOH is 4:5) electrode has excellent capacitance data performance (189 F g −1 at 1 A g −1 and retains 51.9% at 80 A g −1 ). At the same time, it also has a stable cycling performance (almost no attenuation after 50 000 cycles at 40 A g −1 ). The PC‐NS‐3 assembled symmetrical device delivers an energy density of 9.6 Wh kg −1 , when the power density is 699.5 W kg −1 . In addition, it delivers a maximum power density of 53.8 kW kg −1 , when the energy density is 3.5 Wh kg −1 . The excellent electrochemical behavior of PC‐NS‐3 electrode can attribute to the synergistic effect of optimal pore distribution and heteroatoms doping.