学　术

　　由基础与前沿研究院主办的基础论坛第186期邀请瑞士洛桑联邦理工学院（EPFL）光电子纳米材料分子工程实验室（LIMNO）高被引学者Prof.KevinSivula来校作学术交流。具体安排如下，欢迎师生们参加。

　　主　题：Materials for Robust, Inexpensive and High Performance Photoelectrochemical Fuel Production

　　时　间：2019年9月19日（周四）15:00

　　地　点：沙河校区通信楼818

　　主讲人：洛桑联邦理工学院Kevin Sivula 教授

　　主讲人简介：

　　Originally from the United States, Prof. Sivula studied at the University of Minnesota, obtaining a Bachelor degree in Chemical Engineering in 2002, and at the University of California, Berkeley, completing a doctorate in 2007 under the direction of Prof. Jean Fréchet. He then joined Prof. Michael Grätzel’s group at EPFL as a postdoc, and in 2011 he began an independent research program in the Institute of Chemical Sciences and Engineering at EPFL, where he was promoted to Associate Professor of Chemical Engineering in 2018. He directs the Laboratory for molecular engineering of optoelectronic nanomaterials (LIMNO), and teaches courses in transport phenomena, chemical product design, and solar energy conversion.

　　报告摘要：

　　The development of robust and inexpensive semiconducting materials that operate at high efficiency are needed to make the direct solar-to-fuel energy conversion by photoelectrochemical (PEC) cells economically viable. In this presentation the strategy of PEC solar fuel production is introduced and our laboratory’s progress in the development new light absorbing materials and co-catalysts will be discussed along with the application toward overall solar water splitting tandem cells for H2 production (Figure 1). Specifically, this talk will highlight recent results with the ternary oxides (CuFeO2 and ZnFe2O4) 2D transition metal dichalcogenides, and organic (π-conjugated) semiconductors as solution-processed photoelectrodes. With respect to ternary oxides, in our recent work we demonstrate state-of-the-art photocurrent with optimized nanostructuring and addressing interfacial recombination by the electrochemical characterization of the surface states and attached co-catalysts. In addition, we report an advance in the performance of solution processed two-dimensional (2-D) WSe2 for high-efficiency solar water reduction by gaining insight into charge transport and recombination by varying the 2D flake size and passivating defect sites. Finally, with respect to π-conjugated organic semiconductors, in our recent work we demonstrate a π-conjugated organic semiconductor for the sustained direct solar water oxidation reaction. Aspects of catalysis and charge-carrier separation/transport are discussed.

　　　　　　　　　　　　　　　　　　　　　　　　　基础与前沿研究院

　　　　　　　　　　　　　　　　　　　　　　　　　　2019年9月16日