Effects of Anion Carriers on Capacitance and Self-Discharge Behaviors of Zinc Ion Capacitors

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Original languageEnglish
Journal / PublicationAngewandte Chemie - International Edition
Publication statusOnline published - 23 Sep 2020


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-SO4 after adsorbed process, enabling SO42- 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.

Research Area(s)

  • anions, anti-self-discharge, titanium nitride, zinc ion capacitors, HIGH-PERFORMANCE, HYBRID SUPERCAPACITOR, ENERGY-STORAGE, ARRAYS, CHARGE, CYCLABILITY, DESIGN, LIFE

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