Biomass-derived nitrogen-self-doped carbon was prepared by a simple and green approach based on the direct pyrolysis of pork heart using KOH as an activation reagent at controlled temperatures (700–900 ℃). The obtained samples displayed a specific surface area up to 1718.84 m² g^-1, high content of nitrogen (3.03%) and interconnected porous structure, which is able to expose abundant active sites and promote mass transfer. Electrochemical measurements showed that our catalyst possessed a high electrocatalytic activity for oxygen reduction reaction in alkaline solution that is equivalent to that of commercial Pt/C. The sample carbonized at 700 ℃ (PC-APHs-700) with the onset potential of 0.92 V and half-wave potential of 0.80 V possessed the highest concentrations of graphite and pyridine nitrogen and exhibited the best performance among the PC-APHs-T samples. In addition, PC-APHs-700 had a higher long-term stability and stronger methanol tolerance than commercial Pt/C. This work demonstrates that it is a promising approach to develop and utilize carbon materials with added value as effective metal-free cathode catalysts for alkaline fuel cells based on economic and environmental friendly renewable biomass.

通过简单，绿色的方法，在控制温度（700–900℃）下，使用KOH作为活化剂，直接对猪肉心进行热解，制备了生物质衍生的氮自掺杂碳。所得样品的比表面积最大为1718.84 m ² g ^-1，高含量的氮（3.03％）和相互连接的多孔结构，能够暴露出丰富的活性位点并促进传质。电化学测量表明，我们的催化剂对碱性溶液中的氧还原反应具有很高的电催化活性，与商业化的Pt / C相当。在700℃碳化的样品（PC-APHs-700）的起始电位为0.92 V，半波电位为0.80 V，具有最高的石墨和吡啶氮浓度，并且在PC-APHs-T样品中表现最佳。此外，PC-APHs-700具有比商业Pt / C更高的长期稳定性和更强的甲醇耐受性。