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3 years ago

Carbon Textile Decorated with Pseudocapacitive VC/VxOy for High-Performance Flexible Supercapacitors

Carbon Textile Decorated with Pseudocapacitive VC/VxOy for High-Performance Flexible Supercapacitors
Seung-Mo Lee, Do Van Lam, Hyung Cheoul Shim, Hak-Joo Lee, Jae-Hyun Kim
It is demonstrated that, via V2O5 coating by low temperature atomic layer deposition and subsequent pyrolysis, ubiquitous cotton textile can readily turn into high-surface-area carbon textile fully decorated with pseudocapacitive VxOy/VC widely usable as electrodes of high-performance supercapacitor. It is found that carbothermic reduction of V2O5 (C + V2O5 C′ + VC + CO/CO2(g)) leads to chemical/mechanical activation of carbon textile, thereby producing high-surface-area conductive carbon textile. In addition, sequential phase transformation and carbide formation (V2O5 VxOy VC) occurred by carbothermic reduction trigger decoration of the carbon textile with redox-active VxOy/VC. Thanks to the synergistic effect of electrical double layer and pseudocapacitance, the supercapacitors made of the hybrid carbon textile exhibit far better energy density (over 30-fold increase) with excellent cycling stability than the carbon textile simply undergone pyrolysis. The method can open up a promising and facile way to synthesize hybrid electrode materials for electrochemical energy storages possessing advantages of both electrical double layer and pseudocapacitive material. Atomic layer deposition of V2O5 on cotton cloth and subsequent simple pyrolysis can be a potential way to produce high-surface-area carbon textiles fully decorated with pseudocapacitive vanadium compounds for high-performance flexible supercapacitor.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201702702

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