Prof. Tinghai Cheng received the B.S., M.S., and Ph.D. degrees from Harbin Institute of Technology in 2006, 2008, and 2013, respectively. He was a visiting scholar in the School of Materials Science and Engineering at Georgia Institute of Technology from 2017 to 2018. Currently, he is a professor of Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences. His research interests are triboelectric nanogenerators, piezoelectric energy harvester, and piezoelectric actuators.