报告人：Professor Yiying Wu，Leet Endowed Chair（Department of Chemistry and Biochemistry, The Ohio State University）
K-air batteries have advantages in low cost. Normally metal-air batteries are hindered by the sluggish kinetics of oxygen reduction and evolution reactions (ORR/OER) and reliance on electrocatalysts. In a K-air battery, oxygen is reduced only to superoxide (O2??), the anion formed by adding a single electron to a diatomic oxygen molecule. Therefore, O2/ O2?? is a unique single-electron ORR/OER process. We have selected potassium for building the superoxide battery due to the fact that it is the lightest alkali metal cation to form the thermodynamically stable superoxide (KO2) product. This allows the battery to operate through the proposed facile one-electron redox process of O2/ KO2. This strategy provides an elegant solution to the long-lasting kinetic challenge of ORR/OER in metal-oxygen batteries without using any electrocatalysts. In this talk, I will retrospect our advances and understanding towards the chemistry in superoxide batteries, with an emphasis on our systematic investigation of K-O2 batteries since its invention by my group in 2013. Furthermore, the advancements in electrodes and electrolytes can be used in other potassium secondary batteries such as potassium-ion and potassium-sulfur batteries.
Yiying Wu received his B.S. in chemical physics from the University of Science and Technology of China in 1998, and his Ph.D. in chemistry from the University of California at Berkeley in 2003 with Prof. Peidong Yang. He then did his postdoctoral research with Prof. Galen D. Stucky at the University of California, Santa Barbara, and joined the chemistry faculty at The Ohio State University in the summer of 2005. He was promoted to associate professor with tenure in 2011 and to full professor in 2014. Since 2017, he has been appointed as the Leet Endowed Chair. He has been serving as an associate editor for ACS Applied Materials and Interfaces since 2013. His group focuses on materials chemistry and interface synthesis for energy conversion and storage. He is the inventor of the one-electron K-O2 battery and pioneered solar batteries that integrate solar harvesting with energy storage. He received Cottrell Scholar Award in 2008, NSF CAREER Award in 2010, CAPA Biomatik Distinguished Faculty Award in 2014, and Midwest Energy News “40 under 40” in 2015. His invention of K-air battery received DOE Clean Energy Prize in 2014.