Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 1, Pages 668-677Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01676
Keywords
gradient oxygen vacancies; vanadium pentoxide; PEDOT; nanocables; supercapacitors
Funding
- National Natural Science Foundation of China [U1503292, 51472182]
- Fundamental Research Funds for the Central Universities
- National Key Research and Development Program of China [2017YFA0204600]
- National Science Foundation [DMR 1505902, 1803256]
- China Scholarship Council (CSC)
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1803256] Funding Source: National Science Foundation
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V2O5/poly(3,4-ethylenedioxythiophene) nanocables with oxygen vacancies gradually decreasing from the surface to the core (G-V2O5/PEDOT nanocables) were prepared as electrodes for supercapacitors. Gradient oxygen vacancies formed when 3,4-ethylenedioxythiophene monomers polymerized conformally on the surface of V2O5 nanofibers, providing G-V2O5/PEDOT nanocables with much improved charge storage kinetics and structural durability. The role of gradient oxygen vacancies in enhancing charge transfer/transport was also evidenced by means of density functional theory calculations. G-V2O5/PEDOT nanocable-based supercapacitors showed excellent electrochemical performance with a high specific capacitance of 614 F g(-1) and energy density of 85 W h kg(-1) in neutral aqueous electrolyte. The synergistic combination of gradient oxygen vacancies and polymer shell provided the G-V2O5/PEDOT nanocable-based supercapacitors with an excellent long cycling life with 122% capacitance retention after 50 000 cycles. Without any additional oxidizing agent, this simple synthesis method is cost competitive and ready for scale up manufacturing for such energy storage electrode materials.
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