Nogai A, Nogai EA, Akimbaeva DD, et al. Electrocapacitive properties of cathode materials based on Na3Fe2(PO4)3 polycrystals synthesised by solid-phase and melt-hardening methods. Eur. J. Phys. Funct. Mater. 2026;9(2). Accessed March 10, 2026. https://ephys.kz/index.php/journal/article/view/39