报告题目：
Dealloying of Lithium-based alloys and spontaneous evolution of nanoporous structures
报告时间：2014年1月3日下午1：30
报告地点：曹光彪楼326会议室
联系人：潘洪革教授
报告摘要：
Dealloying, the selective dissolution of one or more of the elemental components from an alloy, is an important corrosion mechanism and a technologically relevant process used to fabricate nanoporous metals for a variety of applications including catalysis, sensing, actuation and super capacitors. The majority of dealloying research so far has focused on noble-metalalloys with miniscule solid-state diffusivity, in which dissolution occurs via interplay between atomic percolation and surface diffusion. Given the wide exploration of Li alloys as Li-ion battery anodes, it becomes necessary to incorporate bulk diffusion into the study of dealloying. Here, we examine dealloying of Li from Li-Sn alloys and show that depending on alloy composition, particle size and dealloying rate, all known dealloyed morphologies evolve including bicontinuous nanoporous structures with different length scales, hollow core–shell particles and Kirkendall voids. Furthermore, we elucidate the role of bulk diffusion in morphology evolution using various electrochemical techniques. Our results provide implications for lithium-ion battery development while significantly broadening the spectrum of nanostructure fabrication.
报告人简介：
Qing Chen received his PhD degree in Arizona State University in 2013 under the advisory of Prof. Karl Sieradzki. His research centers on alloy electrochemistry, dealloying theory and its application to energy-storage materials. He has recently authored and co-authored works that appeared in journals including Nature Materials, Journal of Electrochemical Society and Physical Review Letters.
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金属材料研究所
2012.12.31
