Advanced materials for energy harvesting, storage, sensing and environmental engineering II Mohammed El Ganaoui, Mohamed El Jouad, Rachid Bennacer and Jean-Michel Nunzi Eur. Phys. J. Appl. Phys., 93 1 (2021) 10902 Published online: 06 January 2021 DOI: 10.1051/epjap/2020200364