9月3日境外来访专家学术报告—Prof. Song Jin

报告题目

Dislocation-Driven Nanomaterial Growth and Solar Energy Conversion Using Earth-Abundant Nanomaterials

报告时间

2013年9月3日上午10:00

报告地点

合肥微尺度物质科学国家实验室一楼科技报告厅

摘要

The scale of renewable energy challenge not only calls for highly efficient technologies but also abundant, inexpensive, and robust materials. Nanomaterials such as one-dimensional (1D) nanowires can help to mitigate the poor properties of earth-abundant semiconductors to enhance solar energy conversion. I will first discuss a new growth mechanism of nanowires, in which screw dislocation defects provide the self-perpetuating steps to enable anisotropic crystal growth. Dislocations can further drive the spontaneous formation of nanotubes, 2D plates, and other nanomaterial morphologies for many different materials synthesized via various methods.

Our discovery and understanding of the crystal growth theory have enabled the low-cost synthesis of nanomaterials for large scale renewable energy applications. For example, we have developed rational synthesis of nanomaterials of earth-abundant semiconductors, such as hematite (-Fe2O3) and pyrite (FeS2), and investigated their photoelectrochemical (PEC) and photovoltaic (PV) properties. Doping and 3D nanostructuring strategies are further developed to overcome the conflicting requirements by light harvesting and carrier collection. Furthermore, by controlling the nanostructures and polymorphs of two-dimensional (2D) layered MX2 (M = Mo, W; X = S, Se) materials, we have significant enhanced their catalytic activity in hydrogen evolution reaction for PEC water splitting.

报告人

Prof. Song Jin,

Department of Chemistry, University of Wisconsin-Madison

报告人简介：⑴现在工作单位及职称 ⑵主要研究方向 ⑶学术成就简述（100字以内）

Song Jin is the professor of chemistry at the University of Wisconsin-Madison. He received his Ph.D. in 2002 from Cornell University under the direction of Prof. Francis J. DiSalvo and carried out his postdoctoral research under the direction of Prof. Charles M. Lieber at Harvard University. Prof. Jin is interested in the chemistry and physics of nanoscale materials and solid state materials and their applications, especially in renewable energy.Prof. Jin developed innovative synthesis of a variety of nanomaterials including metal silicides, oxides and chalcogenides, and developed fundamental understanding of screw dislocation-driven growth of nanomaterials in the context of crystal growth theory. Building on the understanding of novel physical properties, Jin advances the interdisciplinary exploitation of (nano)materials for photovoltaic and photoelectrochemical solar energy conversion, thermoelectric energy conversion, energy storage, nanospintronics, and biotechnology. The unifying theme of Jin’s energy research is the focus on earth-abundant materials. Prof. Jin has authored or co-authored 4 patents and 87 publications. He has been recognized with a NSF CAREER Award, a Research Corporation Cottrell Scholar Award and as one of world’s top 35 innovators under the age of 35 (TR35 Award) by the MIT Technology Review Magazine, the ACS ExxonMobil Solid State Chemistry Fellowship, and the Alfred P. Sloan Research Fellowship. Most recently he received the Research Corporation SciaLog Award for Solar Energy Conversion and U. of Wisconsin-Madison Vilas Associate award and Romnes Faculty Fellowship.

参加者：所有感兴趣的老师和学生

主办单位：微尺度、化学与材料科学学院、外事办