Yunfeng Zhai has over 10 years of experience in developing and testing membranes and electrocatalysts for proton exchange membrane fuel cells (PEMFCs). He was awarded a PhD in Chemical Engineering by Chinese Academy of Sciences, Dalian Institute of Chemical Physics, in 2008. His Ph.D. dissertation was based on studies of performance degradation of H3PO4/PBI high temperature PEMFC and development of high temperature proton conductive membranes. He joined the Hawaii Natural Energy Institute at the University of Hawaii at Manoa as a postdoctoral fellow in November 2007. He has been working on the effect of air pollutants and system contaminants on durability and degradation of PEMFCs, and the degradation and contamination mechanisms of PEMFCs for 8 years. He is also interested in the development of electrolytes and electrocatalysts materials and electrode structures for energy storage and electrochemical technologies. He is a reviewer of several journals in electrochemical and energy field, and member of The Electrochemical Society and American Chemical Society.