A mesoporous carbon-based catalyst derived from cobalt and boron co-doped melamine formaldehyde gel for oxygen reduction reaction

摘要

Non-precious metal catalysts are playing an increasingly important role in research on oxygen reduction reaction (ORR) catalysts for fuel cells due to their relatively low cost. In this work, a novel mesoporous catalyst derived from cobalt- and boron-co-doped melamine formaldehyde (MF) gel (Co, B-MF) was successfully synthesized by a facile self-assembly pyrolysis method. It was found that doping of Co and B could provide various active sites and an appropriate pyrolysis temperature was beneficial to increase the number of active sites. As a result, the obtained Co, B-MF-900 catalyst (pyrolyzed at 900 degrees C) exhibited an outstanding ORR performance in 0.1 M KOH solution with a high onset potential of 1.1 V versus reversible hydrogen electrode (vs RHE), which was 0.1 V higher than that of the commercial Johnson Matthey Pt/C. Additionally, Co, B-MF-900 displayed good stability and superior methanol tolerance. The superior ORR performance of Co, B-MF-900 can be attributed to its mesoporous structure, the synergistic effect of active sites, and the excellent conductivity of the carbon carrier. (C) 2019 Elsevier Ltd. All rights reserved.