Presenter：Yiying Wu
Department ofChemistry, Ohio State University
Topic：SuperoxideBatteries: Oxygen Redox without Catalysts
Time： 09：00AM, June 15th
Location：909-B
Abstract
Oxygen is a crucial component in emerging technologies inenergy conversion and storage. For example, Li�O2 battery isregarded as one of the most promising energy storage systems for futureapplications. However, its energy efficiency is greatly undermined by the largeoverpotentials of the discharge (formation of Li2O2) andcharge (oxidation of Li2O2) reactions. The parasiticreactions of electrolyte and carbon electrode induced by the high chargingpotential cause the decay of capacity and limit the battery life. Here, I willpresent our systematic investigation of a K�O2 battery that uses K+ ions to capture superoxide (O2-) to form thethermodynamically stable KO2 product. This allows for the battery tooperate through the facile one-electron redox process of O2/ O2-.Without the use of catalysts, the battery shows a low discharge/chargepotential gap of less than 50 mV at a modest current density. The similar ideahas also been applied to Na-O2 batteries. I will also present our recent progress in “solarbattery”, which possesses the dual functions of solar energy harvesting andstorage in a single device. An example is 'lithium−iodinesolar flow battery' that brings together a lithium�iodine redox-flow batteryand a dye-sensitized photoelectrode. The photoexcitedelectron transfer between the photoelectrode and the iodine catholyte enablessolar-assisted charging of the flow battery. Such a hybrid device has promisingapplications in building integrated solar harvesting/storage, solar farms andsolar fuelling stations.
Biography
YiyingWu received his B.S. in chemical physics from the University of Science andTechnology of China in 1998, and his Ph.D. in chemistry from the University ofCalifornia at Berkeley in 2003 with Prof. Peidong Yang. He then did hispostdoctoral research with Prof. Galen D. Stucky at the University ofCalifornia, Santa Barbara, and joined the chemistry faculty at The Ohio StateUniversity in the summer of 2005. He was promoted to associate professor withtenure in 2011 and to full professor in 2014. He has been serving as an associateeditor for ACS Applied Materials and Interfaces since 2013. His group focuseson materials chemistry for energy conversion and storage. He is the inventor ofthe one-electron K-O2 battery and pioneered solar batteries that integratesolar harvesting with energy storage. He received Cottrell Scholar Award in2008, NSF CAREER Award in 2010, CAPA Biomatik DistinguishedFaculty Award in 2014, and Midwest Energy News “40 under 40” in 2015. His invention of K-air battery received DOE Clean EnergyPrize in 2014.
Contact: Yanguang Li
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