Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand.
Synchrotron Light Research Institute, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand.
Nanoscale. 2023 May 25;15(20):9003-9013. doi: 10.1039/d3nr00898c.
Zinc (Zn) is an excellent material for use as an anode for rechargeable batteries in water-based electrolytes. Nevertheless, the high activity of water leads to Zn corrosion and hydrogen evolution, along with the formation of dendrites on the Zn surface during repeated charge-discharge (CD) cycles. To protect the Zn anode and limit parasitic side reactions, an artificial solid electrolyte interphase (ASEI) protective layer is an effective strategy. Herein, an ASEI made of a covalent organic framework (COFs: HqTp and BpTp) was fabricated on the surface of a Zn anode Schiff base reactions of aldehyde and amine linkers. It is seen that COFs can regulate the Zn-ion flux, resulting in dendritic-free Zn. COFs can also mitigate the formation of an irreversible passive layer and the hydrogen evolution reaction (HER). Zn plating/stripping tests using a symmetrical cell suggest that HqTpCOF@Zn shows superior stability and greater coulombic efficiency (CE) compared to bare Zn. The full cell having COFs@Zn also displays much improved cyclability. As a result, the COF proves to be a promising ASEI material to enhance the stability of the Zn anode in aqueous media.
锌（Zn）是一种出色的材料，可用作水基电解质中可充电电池的阳极。然而，水的高活性会导致 Zn 腐蚀和析氢，以及在反复充放电（CD）循环期间在 Zn 表面形成枝晶。为了保护 Zn 阳极并限制寄生副反应，人工固体电解质界面（ASEI）保护层是一种有效的策略。在此，通过醛和胺链接剂的席夫碱反应，在 Zn 阳极表面制备了共价有机框架（COFs：HqTp 和 BpTp）组成的 ASEI。结果表明，COFs 可以调节 Zn 离子通量，从而形成无枝晶的 Zn。COFs 还可以减轻不可逆钝化层和析氢反应（HER）的形成。使用对称电池进行的 Zn 电镀/剥离测试表明，与裸 Zn 相比，HqTpCOF@Zn 表现出更高的稳定性和更高的库仑效率（CE）。具有 COFs@Zn 的全电池也显示出更好的循环稳定性。因此，COF 被证明是一种很有前途的 ASEI 材料，可以提高 Zn 阳极在水介质中的稳定性。
