Effects of Anion Carriers on Capacitance and Self-Discharge Behaviors of Zinc Ion Capacitors
Effects of Anion Carriers on Capacitance and Self-Discharge Behaviors of Zinc Ion Capacitors
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DOI：
10.1002/anie.202012202
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发表时间：
2020-11-03
影响因子：
16.6
通讯作者：
Zhi, Chunyi
中科院分区：
文献类型：
--
作者：
Huang, Zhaodong;Wang, Tairan;Zhi, Chunyi
赝电容行为和离子混合电容器可以提高超级电容器的能量密度，但研究仅考虑了电化学过程中阳离子的反应，导致对机理的理解有缺陷。研究了不同阴离子载体对氮化钛基锌离子电容器（Zn-TiN电容器）电化学性能的影响。DFT计算揭示了TiN-SO 4吸附过程后的稳定结构，使SO 42-参与电化学过程，构建了两步吸附和插层储能机制，提高了Zn-TiN电容器的电容量和抗自放电能力，其传递489.8F·g（-1）的电容，并且即使在500小时静置时间后仍保持83.92%的电容。在电化学过程中引入阴离子的储能体系可以提高离子混合电容器的容量和抗自放电能力。
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.