Abstract
Boron-doped porous carbon impregnated with manganese oxide were synthesized from sodium borohydride (NaBH4) and carbon dioxide (CO2) under a moderate experimental condition (1 bar and 500 ℃) by a facile two-step method. The boron-manganese oxide-carbon nanocomposites exhibited enhanced electrochemical properties in both electrocatalysts for oxygen reduction reaction (ORR) and electrode materials for supercapacitors. The composites showed a four electron transfer pathway and had electrocatalytic activity comparable to that of commercial platinum-carbon catalyst. They also provided a high capacitance (150 F g-1 at 1.0 A g-1 and 136 F g-1 at 10.0 A g-1) compared to that of bare boron-doped carbon (58 F g-1 at 1.0 A g-1 and 15 F g-1 at 10.0 A g-1) due to generation of new active sites, increase in specific surface area, and reduction of overall resistance by efficient interaction within the composites.
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