材料科学
超级电容器
电化学
水溶液
钒
电解质
化学工程
插层(化学)
钴
储能
无机化学
溶解
电极
化学
有机化学
冶金
物理化学
功率(物理)
物理
量子力学
工程类
作者
Qiang Chen,Zheyu Tang,Hang Li,Wenlong Liang,Yi Zeng,Jianli Zhang,Guangya Hou,Yiping Tang
标识
DOI:10.1021/acsami.3c19534
摘要
Aqueous ammonium ion hybrid supercapacitor (A-HSC) is an efficient energy storage device based on nonmetallic ion carriers (NH4+), which combines advantages such as low cost, safety, and sustainability. However, unstable electrode structures are prone to structural collapse in aqueous electrolytes, leading to fast capacitance decay, especially in host materials represented by vanadium-based oxidation. Here, the Co2+ preintercalation strategy is used to stabilize the VO2 tunnel structure and improve the electrochemical stability of the fast NH4+ storage process. In addition, the understanding of the NH4+ storage mechanism has been deepened through ex situ structural characterization and electrochemical analysis. The results indicate that Co2+ preintercalation effectively enhances the conductivity and structural stability of VO2, and inhibits the dissolution of V in aqueous electrolytes. In addition, the charge storage mechanisms of NH4+ intercalation/deintercalation and the reversible formation/fracture of hydrogen bonds were revealed.
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