Chen Qiang, Tang Zheyu, Li Hang, Liang Wenlong, Zeng Yuquan, Zhang Jianli, Hou Guangya, Tang Yiping
College of Material Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
ACS Appl Mater Interfaces. 2024 Apr 17;16(15):18824-18832. doi: 10.1021/acsami.3c19534. Epub 2024 Apr 2.
Aqueous ammonium ion hybrid supercapacitor (A-HSC) is an efficient energy storage device based on nonmetallic ion carriers (NH), 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 Co preintercalation strategy is used to stabilize the VO tunnel structure and improve the electrochemical stability of the fast NH storage process. In addition, the understanding of the NH storage mechanism has been deepened through ex situ structural characterization and electrochemical analysis. The results indicate that Co preintercalation effectively enhances the conductivity and structural stability of VO, and inhibits the dissolution of V in aqueous electrolytes. In addition, the charge storage mechanisms of NH intercalation/deintercalation and the reversible formation/fracture of hydrogen bonds were revealed.
水合铵离子混合超级电容器（A-HSC）是一种基于非金属离子载体（NH）的高效储能装置，它兼具低成本、安全和可持续等优点。然而，不稳定的电极结构在水性电解质中容易发生结构坍塌，导致电容快速衰减，尤其是在以钒基氧化物为代表的主体材料中。在此，采用钴预嵌入策略来稳定VO隧道结构，并提高快速NH存储过程的电化学稳定性。此外，通过非原位结构表征和电化学分析加深了对NH存储机制的理解。结果表明，钴预嵌入有效地提高了VO的导电性和结构稳定性，并抑制了V在水性电解质中的溶解。此外，还揭示了NH嵌入/脱嵌的电荷存储机制以及氢键的可逆形成/断裂。
