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In this study, three catalysts (BC-Zn, BC-HP and BC-Na) were prepared by pyrolyzing corn stalk biomass with ZnCl2, H3PO4 and NaOH acting as activator. We compare and summarize the structure and electrocatalytic activity of these carbon materials for oxygen reduction reaction (ORR). A highperformance doped carbon catalyst (BC-Na) with a BET surface area of up to 1337.27 m g was prepared by using NaOH as an activating agent. For ORR in alkaline media, BC-Zn exhibited a more negative shift of -0.42 V (vs Hg/HgO) in contrast to BC-HP (-0.31 V) and BC-Na (-0.31 V). Even though BC-Na showed a negative ORR onset potential (E=-0.21 V) in comparison with Pt/C (E=0.09V), its current density reached up to 5.72 mA·cm, which is much higher than Pt/C (3.25 mA·cm). It is supposed that the excellent electrocatalytic property of BC-Na originated from the combined effect of high specific surface area and N doping. The low-cost and simple approach used in study provides a straightforward route for the preparation of ORR electrocatalysts from biomass.

Porous nitrogen doped carbon materials as High-Active Oxygen Reduction Catalysts Derived from Biomass (Corn Stalk)