Fundamentals of Energy Electrochemistry 面向电化学能源体系的基础研究

Recently，our research interests extend to fundamental investigations of electrochemical energy systems. By combined in-situ STM and Raman techniques, we devote ourselves in the characterization of interfacial processes of energy conversion and storages devices such as dye-sensitized solar cell (DSSC) and lithium ion batteries (LIB).

On one hand, taking advantages of localized surface plasmon resonance of noble metal nanopartices by interaction with light and thus created million times enhancement of Raman signals, we synthesized Ag@TiO2 core-shell nanoparticles as the electrodes and are developing method, in collaboration with Prof. Zhong-Qun Tian’ team, for investigation of interfacial processes by Raman spectroscopy. In addition, by optimizing the configuration and materials of the core-shell nanoparticles and employing ionic liquids, we hope that photon conversion efficiency as well as the stability of DSSC can be improved. Meanwhile, investigations on the enhancement mechanisms of surface plasmon in DSSC will be carried out.

On the other hand, focusing on the safety issue in LIB, we study the formation of solid electrolyte interphase, electrodeposition of lithium by using electrochemical methods, scanning tunneling microscopy(STM) as well as Raman spectroscopy.  Meanwhile, we explore the feasibility and advantages of ionic liquid as media for LIB.  In addition, we use powder microelectrode techniques to estimate the active electrode materials and for design of novel type of battery systems.

最近，我们的研究兴趣拓展到电化学能源体系的基础研究，结合原位STM和Raman光谱技术，致力于染料敏化太阳能电池(DSSC)和锂离子电池(LIB)体系的表、界面过程的原位表征。

一方面，我们利用Ag纳米颗粒在可见光区发生局域表面等离子体共振及产生的百万倍增强的Raman信号的特点，以Ag@TiO₂核壳结构为电极，通过与我院田中群教授团队合作，发展Raman光谱技术研究DSSC界面电荷转移的方法，并从尺寸和壳层材质等角度涉及和优化纳米结构电极，同时运用离子液体作为介质，提高DSSC光转换效率和稳定性，并研究表面等离子体在DSSC中的各种增强机制。

另一方面，针对锂离子电池的安全性问题，运用传统电化学方法、扫描隧道显微镜以及拉曼光谱， 研究固体电解质界面层（SEI）膜的形成机理、锂在石墨基底上电化学沉积，并探索离子液体作为电解液的可行性；同时，我们运用粉末微电极技术研究，表征各种LIB电极材料，尝试设计新型的电池体系。