Fe-Induced Electronic Modulation In α-MnO2: A DFT + U Study for Advanced Cathode MaterialsFatima-ezzahra Loudifa, Ikrame Nague, Hajar Atmani and Ahmed JouaitiE3S Web Conf., 649 (2025) 01009DOI: https://doi.org/10.1051/e3sconf/202564901009