Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 18, Pages 16647-16655Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03830
Keywords
V2O5; PEDOT; oxygen vacancies; tunable; supercapacitors
Funding
- National Natural Science Foundation of China [U1503292, 51472182, 51872204]
- Fundamental Research Funds for the Central Universities
- National Key Research and Development Program of China [2017YFA0204600]
- China Scholarship Council (CSC)
- National Science Foundation [1803256, NNCI-1542101]
- International Scientific Partnership Program at King Saud University [ISPP-139]
- National Institute of Standards and Technology
- University of Washington
- Molecular Engineering & Sciences Institute
- Clean Energy Institute
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1803256] Funding Source: National Science Foundation
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Oxygen vacancies (Vo) play a crucial role in energy storage materials. Oxygen-vacancy-enriched vanadium pentoxide/poly(3,4-ethylenedioxythiophene) (Vo-V2O5/PEDOT) nanocables were prepared through the one-pot oxidative polymerization of PEDOT. PEDOT is used to create tunable concentrations of Vo in the surface layer of V2O5, which has been confirmed by X-ray absorption near edge structure (XANES) analysis and X-ray photoelectron spectroscopy (XPS) measurements. Applied as electrode materials for supercapacitors, the electrochemical performance of Vo-V2O5/PEDOT is improved by the synergistic effects of Vo in V2O5 cores and PEDOT shells with rapid charge transfer and fast Na+ ion diffusion; however, it is compromised subsequently by excessive Vo in consuming more V5+ cations for Faradic reactions. Consequently, the specific capacitance and the energy density of Vo-V2O5/PEDOT nanocables are significantly enhanced when the overall concentration of Vo is 1.3%. The migration of Vo renders an increased capacitance (105% retention) after 10 000 cycles, which is verified and corroborated with density functional theory simulations and XANES analysis. This work provides an illumination for the fabrication of high-performance electrode materials in the energy storage field through Vo.
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