Abstract
Flue gas was directly converted into carbon materials with the doping of iron, boron and nitrogen atom. The B-N doping was achieved in a single step with the carbonization of flue gas and subsequently, the Fe atom was incorporated into the material using the iron precursor (FeCl3). The synthesized Fe-N-B co-doped carbon materials showed enhanced electrochemical activity for oxygen reduction reaction (ORR), which is comparable to that of commercial platinum catalysts. The effect of various FeN/C ratios by varying the amount of iron species in the synthesis step was investigated, and the clear correlation between the doping of Fe/N and electrochecmical activity was confirmed. The optimized iron weight ratio was 33 % due to the existence of Fe-N pyridinic bonding in the carbon lattices without agglomeration of Fe species. The high electrocatalytic activity toward ORR and long-term durability for 10,000 cycles of synthesized Fe-N-C composites indicate that flue gas itself can be an effective precursor for efficient carbon-based electrocatalysts.
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