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Hollow Carbon Nanobelts Codoped with Nitrogen and Sulfur via a Self‐Templated Method for a High‐Performance Sodium‐Ion Capacitor
Author(s) -
Cui Chunyu,
Wang Heng,
Wang Meng,
Ou Xuewu,
Wei Zengxi,
Ma Jianmin,
Tang Yongbing
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201902659
Subject(s) - materials science , pseudocapacitance , cathode , anode , chemical engineering , electrolyte , carbon fibers , capacitor , tin , energy storage , foil method , power density , nanotechnology , supercapacitor , electrochemistry , electrode , composite material , voltage , chemistry , electrical engineering , composite number , power (physics) , physics , quantum mechanics , engineering , metallurgy
Sodium‐ion capacitors (SICs) have attracted enormous attention due to their high energy density and high power density. In this work, N and S codoped hollow carbon nanobelts (N/S‐HCNs) are synthesized by a self‐templated method. The as‐synthesized carbon nanobelts exhibit excellent performance in pseudocapacitance and electric double layer anions adsorption. After pairing the N/S‐HCNs cathode with a tin foil anode in a carbonate electrolyte, the obtained SIC achieves a high specific capacity of 400 mAh g −1 at 1 A g −1 (based on the mass of cathode material) and energy density of 250.35 Wh kg −1 at 676 W kg −1 (based on the total mass of cathode and anode materials). Besides, the presented SIC also demonstrates high cycling stability with almost 100% capacity retention after 10 000 cycles, which is among the best results of the reported SICs, suggesting the potential for high‐performance energy storage applications.