Journal
ADVANCED MATERIALS
Volume 32, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201908420
Keywords
defective structures; intercalation pseudocapacitance; vanadium dioxide
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Funding
- National Natural Science Foundation of China [21646012]
- China Postdoctoral Science Foundation [2016M600253, 2017T100246]
- Postdoctoral Foundation of Heilongjiang Province [LBH-Z16060]
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The weak van der Waals interactions enable ion-intercalation-type hosts to be ideal pseudocapacitive materials for energy storage. Here, a methodology for the preparation of hydrated vanadium dioxide nanoribbon (HVO) with moderate transport pathways is proposed. Out of the ordinary, the intercalation pseudocapacitive reaction mechanism is discovered for HVO, which powers high-rate capacitive charge storage compared with the battery-type intercalation reaction. The main factor is that the defective crystalline structure provides suitable ambient spacing for rapidly accommodating and transporting cations. As a result, the HVO delivers a fast Zn(2+)ion diffusion coefficient and a low Zn(2+)diffusion barrier. The electrochemical results with intercalation pseudocapacitance demonstrate a high reversible capacity of 396 mAh g(-1)at 0.05 A g(-1), and even maintain 88 mAh g(-1)at a high current density of 50 A g(-1).
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