Han, Jeonghoon Shin, Seongjong Oh, Seungtae Hwang, Hee Jae Choi, Dukhyun Lee, Choongyeop Nam, Youngsuk 2024-08-23T08:30:28Z 2024-08-23T08:30:28Z 2024-08-22 2024-07 2211-2855 https://pubs.kist.re.kr/handle/201004/150480 Recent studies on water-based pyroelectric generators (PEGs), which convert thermal energy to electrical energy, have focused on different operational modes like water evaporation, water stream, and droplet sliding. However, the development of sustainable, high-powered generators and comprehensive theoretical models has been limited. In response, our research introduces a droplet-based superhydrophobic pyroelectric generator (S-DPEG), exploiting the characteristics of lead magnesium niobate-lead titanate (PMN-0.3PT) coated with titanium dioxide nanoparticles. We analyzed power density by considering the phase transient temperature that maximizes the pyroelectric coefficient of PMN-0.3PT, testing various Weber numbers and droplet diameters within a moderate operating temperature range of 40 degrees C to 80 degrees C. Considering the dynamic characteristics of water droplet on superhydrophobic surfaces, we suggest a peak current model that can accurately predict the peak current within similar to 15 % of error. Also, the maximum power density of 54.5 mu W/cm(2) at a droplet diameter of 3.6 mm and a temperature of 80 degrees C, a noteworthy improvement over 3 times higher than previous water-based PEGs. Our results enhance the understanding of the pyroelectric effect coupled with drop impact dynamics and outline novel strategies for designing high-performance water-based PEGs. English Elsevier BV High-powered superhydrophobic pyroelectric generator via droplet impact Article 10.1016/j.nanoen.2024.109682 1 Nano Energy, v.126 Nano Energy 126 N scie scopus 001288554800001 2-s2.0-85192072677 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article WASTE HEAT ORGANIC FRAMEWORKS RENEWABLE ENERGY CONVERSION STORAGE Pyroelectric generator Droplet impact Superhydrophobic surface Energy conversion