Interface Engineering V2O5 Nanofibers for High‐Energy and Durable Supercapacitors

A local electric field is induced to engineer the interface of vanadium pentoxide nanofibers (V2O5‐NF) to manipulate the charge transport behavior and obtain high‐energy and durable supercapacitors. The interface of V2O5‐NF is modified with oxygen vacancies (Vö) in a one‐step polymerization process...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2019-08, Vol.15 (31), p.n/a
Main Authors: Bi, Wenchao, Wang, Jichao, Jahrman, Evan P., Seidler, Gerald T., Gao, Guohua, Wu, Guangming, Cao, Guozhong
Format: Article
Language:English
Subjects:
Capacitance
Charge distribution
Charge transfer
Charge transport
Coated electrodes
Electric fields
Electrode materials
Energy storage
interfaces
local electric fields
Nanofibers
Nanotechnology
polyaniline
Polyanilines
Storage systems
Supercapacitors
Transport phenomena
Vanadium pentoxide
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Summary:A local electric field is induced to engineer the interface of vanadium pentoxide nanofibers (V2O5‐NF) to manipulate the charge transport behavior and obtain high‐energy and durable supercapacitors. The interface of V2O5‐NF is modified with oxygen vacancies (Vö) in a one‐step polymerization process of polyaniline (PANI). In the charge storage process, the local electric field deriving from the lopsided charge distribution around Vö will provide Coulombic forces to promote the charge transport in the resultant Vö‐V2O5/PANI nanocable electrode. Furthermore, an ≈7 nm porous PANI coating serves as the external percolated charge transport pathway. As the charge transfer kinetics are synergistically enhanced by the dual modifications, Vö‐V2O5/PANI‐based supercapacitors exhibit an excellent specific capacitance (523 F g−1) as well as a long cycling lifespan (110% of capacitance remained after 20 000 cycles). This work paves an effective way to promote the charge transfer kinetics of electrode materials for next‐generation energy storage systems. Interface modification of V2O5 nanofibers is achieved by inducing oxygen vacancies in one‐step polymerization of polyaniline (PANI) for use in supercapacitors. Charge transfer kinetics of the obtained Vö‐V2O5/PANI nanocables is synergistically enhanced by the local electric field caused by oxygen vacancies and porous PANI shells, leading to an excellent energy density and long cycling life.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201901747