N-doped porous carbon from Sargassum spp. As efficient metal-free electrocatalysts for O2 reduction in alkaline fuel cells
This work reports the synthesis of N-doped porous carbon (NPC) with a high surface area from Sargassum spp. as a low-cost alternative for electrocatalyst production for the oxygen reduction reaction (ORR). Sargassum spp. was activated with potassium hydroxide at different temperatures (700, 750, and 800 °C) and then doped with pyridine (N700, N750, and N800). As a result of the activation process, the 800 °C sample showed a high surface area (2765 m 2 g −1 ) and good onset potential (0.870 V) and current density (4.87 mA cm −2 ). The ORR performance of the electrocatalysts in terms of their current density was N800 > N750 > N700 > 750 > 800 > 700, while the onset potential decreased in the following order: N800 > 800 > 750 > 700 > N700 > N750. The fuel cell performance of the membrane electrode assembly (MEA) prepared with electrocatalyst synthesized at 750 °C and doped with pyridine was 12.72 mW cm −2 , which was close to that from Pt/C MEA on both the anode and cathode (14.42 mW cm −2 ). These results indicate that NPCs are an alternative to the problem of Sargassum spp. accumulation in the Caribbean due to their high efficiency as electrocatalysts for ORR.
| Main Authors: | , , , , , |
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| Format: | info:eu-repo/semantics/article biblioteca |
| Language: | eng |
| Subjects: | info:eu-repo/classification/Autores/N-DOPED POROUS CARBON, info:eu-repo/classification/Autores/SARGASSUM SPP., info:eu-repo/classification/Autores/OXYGEN REDUCTION REACTION, info:eu-repo/classification/Autores/ALKALINE FUEL CELL, info:eu-repo/classification/cti/7, |
| Online Access: | http://cicy.repositorioinstitucional.mx/jspui/handle/1003/1543 |
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