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Intercalation Pseudocapacitive Zn 2+ Storage with Hydrated Vanadium Dioxide toward Ultrahigh Rate Performance
Author(s) -
Liu Nannan,
Wu Xian,
Fan Lishuang,
Gong Shan,
Guo Zhikun,
Chen Aosai,
Zhao Chenyang,
Mao Yachun,
Zhang Naiqing,
Sun Kening
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201908420
Subject(s) - pseudocapacitance , intercalation (chemistry) , materials science , vanadium , diffusion , van der waals force , electrochemistry , ion , density functional theory , vanadium dioxide , chemical engineering , inorganic chemistry , nanotechnology , supercapacitor , chemistry , molecule , electrode , computational chemistry , thermodynamics , organic chemistry , thin film , physics , engineering , metallurgy
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 .