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The use of Sargassum spp. as raw material for the synthesis of metal-free electrocatalyst was studied. Besides, it offers an interesting alternative to low cost commercial activated carbons with applications in generation and storage energy. In this work, physicochemical and electrochemical properties of pyrolyzed, activated and doped carbons synthesized from this abundant seaweed have been studied. Graphitic carbon formation after pyrolysis was confirmed by Raman spectroscopy. SBET increase after activation and doping treatment was corroborated by BET. Electrochemical analyses demonstrated that the SAC sample exhibits the highest ORR activity and showed a current density (4.78 mA cm⁻²) close to commercial 20 wt% Pt/C (5.6 mA cm⁻²) evaluated at the same conditions. Moreover, SDO sample shows the better onset potential (0.852 V vs. RHE), which is in accordance with the content of N-pyridinic …