Improve harvesting efficiency of tri-stable energy harvester by tailoring potential energy Wangzheng Deng, Weiyang Qin, Jianan Pan, Shijie Shang and Haitao Li Eur. Phys. J. Plus, 137 2 (2022) 268 Published online: 24 February 2022 DOI: 10.1140/epjp/s13360-022-02471-7