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Effects of Anion Carriers on Capacitance and Self‐Discharge Behaviors of Zinc Ion Capacitors
Author(s) -
Huang Zhaodong,
Wang Tairan,
Song Hao,
Li Xinliang,
Liang Guojin,
Wang Donghong,
Yang Qi,
Chen Ze,
Ma Longtao,
Liu Zhuoxin,
Gao Biao,
Fan Jun,
Zhi Chunyi
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202012202
Subject(s) - capacitance , supercapacitor , capacitor , tin , electrochemistry , materials science , ion , pseudocapacitance , energy storage , inorganic chemistry , chemistry , electrode , voltage , electrical engineering , metallurgy , thermodynamics , organic chemistry , engineering , power (physics) , physics
Pseudocapacitive behavior and ion hybrid capacitors can improve the energy density of supercapacitors, but research has only considered the reaction of cations during the electrochemical process, leading to a flawed mechanistic understanding. Here, the effects of various anions carriers on the electrochemical behaviors of titanium nitride‐based zinc ion capacitor (Zn‐TiN capacitor) were explored. DFT calculations revealed the stable structure of TiN‐SO 4 after adsorbed process, enabling SO 4 2− participate in the electrochemical process and construct a two‐step adsorption and intercalation energy storage mechanism, improving the capacitance and anti‐self‐discharge ability of the Zn‐TiN capacitor, which delivered an ultrahigh capacitance of 489.8 F g −1 and retained 83.92 % of capacitance even after 500 h resting time. An energy storage system involving anions in the electrochemical process can improve capacitance and anti‐self‐discharge ability of ion hybrid capacitors.