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Aligned Arrays of Na 2 Ti 3 O 7 Nanobelts and Nanowires on Carbon Nanofiber as High‐Rate and Long‐Cycling Anodes for Sodium‐Ion Hybrid Capacitors
Author(s) -
Wang Huanwen,
Xu Dongming,
Qiu Ruyun,
Tang Shasha,
Li Shuai,
Wang Rui,
He Beibei,
Gong Yansheng,
Fan Hong Jin
Publication year - 2021
Publication title -
small structures
Language(s) - English
Resource type - Journals
ISSN - 2688-4062
DOI - 10.1002/sstr.202000073
Subject(s) - materials science , anode , electrochemistry , cathode , carbon nanofiber , nanowire , nanofiber , sodium ion battery , nanotechnology , energy storage , chemical engineering , carbon fibers , battery (electricity) , sodium , electrode , capacitor , carbon nanotube , composite material , voltage , composite number , faraday efficiency , power (physics) , electrical engineering , chemistry , physics , quantum mechanics , metallurgy , engineering
Sodium‐ion capacitors (SICs) have attracted extensive attentions due to their integration of high‐energy battery and high‐power capacitor as well as the naturally abundant sodium resource. A major challenge of current SICs is to achieve high rate performance and long‐cycle stability of the battery‐type anode. Herein, fast sodium storage is achieved from sodium titanate (Na 2 Ti 3 O 7 ) arrays that are uniformly grown on highly conductive carbon nanofiber networks with a high mass loading of 5.6 mg cm −2 . Nanowires and nanobelts of Na 2 Ti 3 O 7 are both synthesized, and their Na‐ion storage properties are compared. Both arrays can be used as binder‐free and flexible electrodes, but the nanobelts exhibit higher specific capacity and better rate performance than the nanowires with similar mass loading. The difference between two types of nanostructures is ascribed to their different kinetics in ion/charge transport, according to the electrochemical impedance data. SIC full devices consisting of the Na 2 Ti 3 O 7 nanobelt anode and biomass‐derived porous carbon cathode are constructed, which show pretty high specific energy and power performance.