电子传输和离子传输是液/液界面电化学两个基本的电荷转移现象。传统的单极化液/液界面系统面临着电位窗限制的挑战，前期我们提出了双极化液/液界面概念，基于电子耦合离子传输机制拓展了电位窗，解决了离子传输测定的难题。针对目前电荷存储能源领域同样所面临电位窗限制的挑战，本项目将双极化液/液界面的概念拓展到这一领域，提出在原有固/液界面电子传输基础之上，耦合液/液界面离子传输的方式，来调节电荷存储电位窗。一方面，我们将调节传输离子种类，另一方面调节正负极氧化还原电对种类，以最大化电位窗和电荷存储的能量密度。与此同时，我们将采用纳米管模式的扫描电化学显微镜（SECM）研究电子耦合离子传输机制，阐明这一本质现象。通过本项目，拟将为电化学能源存储领域电位窗拓展打开新的思路，同时为液/液界面电化学的发展探索新的应用领域。

Electron transfer (ET) and ion transfer (IT) are the fundamental charge transfers at liquid/liquid (L/L) interface. A long-lasting challenge for L/L interface electrochemistry is the narrow polarized potential window (PPW) to limit the measurement of ion transfers. We previously proposed a concept of two-polarized L/L interface instead of traditional single-polarized interface to resolve the PPW issue by virtue of a coupled ET-IT mechanism. Focusing on the same challenge in charge storage energy field, we follow this concept and developed an ion transfer way combining with the original ET at solid/liquid interface to enlarge the PPW. Different ion transfers at L/L interface and redox probes at positive and negative electrodes will be examined to maximize the PPW and energy density. The scanning electrochemical microscopy based on nanopipette will be used for illustrating the ET-IT mechanism. This project overall aims at developing a new route for improving electrochemical energy storage but also exploring new application fields for L/L interface electrochemistry.