Sulfur doped biocarbon obtained from Sargassum spp. for the oxygen reduction reaction |
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Affiliation: | 1. Centro de Investigación Científica de Yucatán, Carretera Sierra Papacal-Chuburná Puerto, Km 5, Sierra Papacal, México;2. Cinvestav-Saltillo. Grupo SRNyE, México, Parque Industrial Saltillo-Ramos Arizpe, Ramos Arizpe, Coahuila, 25900, México;3. CONACYT, Centro de Investigación Científica de Yucatán, Carretera Sierra Papacal-Chuburná Puerto, Km 5, Sierra Papacal, México |
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Abstract: | Sulfured doped carbon electrocatalysts is synthesized from the waste biomass Sargassum spp. Two doping procedures are examined to determine which is better for Oxygen Reduction Reaction (ORR); one by doping biocarbon obtained from the pyrolysis of the biomass and the second through a process of in situ doping in autoclave. The electrocatalyst are obtained from pyrolysis of the sample at 700 °C, which is finally characterized as a metal free electrocatalyst for the ORR. The electrocatalyst are characterized by BET surface area analysis, Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and the electrochemical characterization is determined in 0.1 M KOH. The sample SSKPT-1 exhibits a promising electrocatalytic activity with an onset potential of 0.896 V vs RHE and a current density of 5 mA cm?2 (at 0.2 V vs. RHE) which could be partly attributed to its high BET surface area of 2755 m2 g?1. |
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Keywords: | Sulfur doped Metal free electrocatalyst Oxygen reduction reaction |
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