Acoustic wave-driven oxidized liquid metal-based energy harvester Jinpyo Jeon, Sang Kug Chung, Jeong-Bong Lee, Seok Joo Doo and Daeyoung Kim Eur. Phys. J. Appl. Phys., 81 2 (2018) 20902 Published online: 08 June 2018 DOI: 10.1051/epjap/2018180011