High levels of Iron-nitrogen doped porous carbon materials are obtained from MOF-253 using a step-by-step post-synthetic modification strategy. MOF-253 possessing of open 2, 2’- bipyridine nitrogen sites not only serves as precursor but also provides chelate bonding sites for Fe2+. Followed by further impregnation of 1, 10-phenanthroline, high surafce area porous carbon materials are obtained. For comparison, when Iron- 1,10-phenanthroline specie as whole are incorporated into MOF-253, carbon materials with less active sites, low surfacec area are obtained. The porous carbon materials derived from MOF-253 by using the step-by-step post-synthetic modification strategy demonstrate excellent ORR activity, high selectivity (direct 4e- reduction of oxygen to water) and stability in both alkaline and acidic condition. The onset potential of the porous carbon material in alkaline conditions (980 mV) is the same as that of Pt/ C (20 wt%) (980 mV) and the half-wave potentials (E1/2) is 840 mV, which is 20 mV more than that of Pt/ C (20 wt%). In acidic conditions, the onset potential and the half-wave potential are only 20 mV and 30 mV less than those of Pt/C (20 wt%). The developed step-by-step post-synthetic modification route of MOFs has expanded the ways to prepare functionalized porous carbon for energy related applications.

Nanoporous carbon derived from a functionalized metal–organic framework as highly efficient oxygen reduction electrocatalyst

253rd National Meeting (2017)

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