Kim, Hyun Soo Hur, Sunghoon Lee, Dong-Gyu Shin, Joonchul Qiao, Huimin Mun, Seunguk Lee, Hoontaek Moon, Wonkyu Kim, Yunseok Baik, Jeong Min Kang, Chong-Yun Jung, Jong Hoon Song, Hyun-Cheol 2024-01-19T12:32:12Z 2024-01-19T12:32:12Z 2022-04-05 2022-03 1754-5692 https://pubs.kist.re.kr/handle/201004/115570 As demands for portable electronic devices grow, wireless energy transfer (WET) has started to become readily available. Until now, studies on WET have been mainly based on the electromagnetic (EM) induction method using EM waves. However, it is still challenging to utilize current EM wave mediated WET in those areas where it is most needed: underwater, body-implant, and EM-shielded cases (liquid/metals). Acoustic energy transfer (AET) can be an alternative to EM-wave based WET. Here, we present a simple but powerful triboelectric AET module by tuning the work function of the triboelectric layer via the large polarization of the embedded relaxor single crystal. Additionally, uniform displacement, a quasi-mode oscillation, across the flexible electrode surface in response to the square wave has improved energy transfer efficiency. A systematic investigation was conducted for energy transferring conditions of receiving angle and ferroelectric polarization. We successfully demonstrated the transmission of 8 mW electric power at a distance of 6 cm underwater, which is sufficient to use in most demanding but inaccessible areas. In addition, AET is demonstrated and discussed in both liquids (underwater and in-body), and solids (metal, wood, and plastic). We anticipate that our approach will enable current next-level AET technology to be utilized in the actual field. English Royal Society of Chemistry Ferroelectrically augmented contact electrification enables efficient acoustic energy transfer through liquid and solid media Article 10.1039/d1ee02623b 1 Energy & Environmental Science, v.15, no.3, pp.1243 - 1255 Energy & Environmental Science 15 3 1243 1255 N scie scopus 000751968500001 Chemistry, Multidisciplinary Energy & Fuels Engineering, Chemical Environmental Sciences Chemistry Energy & Fuels Engineering Environmental Sciences & Ecology Article ULTRASOUND DESIGN