Pyroelectric energy harvesting optimization using PU-xPZT composite Yassine Tabbai, Rjafallah Abdelkader, Abdelhadi Mortadi, Adil Boukhlifi, Fouad Belhora, Reddad El Moznine and Abdessamad El Ballouti Matériaux & Techniques, 111 5-6 (2023) 504 Published online: 22 March 2024 DOI: 10.1051/mattech/2024010