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Carbon Textile Decorated with Pseudocapacitive VC/V x O y for High‐Performance Flexible Supercapacitors
Author(s) -
Van Lam Do,
Shim Hyung Cheoul,
Kim JaeHyun,
Lee HakJoo,
Lee SeungMo
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201702702
Subject(s) - supercapacitor , pseudocapacitance , materials science , carbon fibers , pyrolysis , chemical engineering , textile , electrochemistry , nanotechnology , electrode , composite material , composite number , chemistry , engineering
It is demonstrated that, via V 2 O 5 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 V x O y /VC widely usable as electrodes of high‐performance supercapacitor. It is found that carbothermic reduction of V 2 O 5 (C + V 2 O 5 → C′ + VC + CO/CO 2 (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 (V 2 O 5 → V x O y → VC) occurred by carbothermic reduction trigger decoration of the carbon textile with redox‐active V x O y /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.