Iron and nitrogen co-doped two-dimensional (2D) porous carbon-flakes have been fabricated by using foam-like Medulla stachyuri (MS, the stem pith of tetrapanax papyrifer) as both carbon precursor and template and ammonium ferric citrate as iron and nitrogen precursor. The ammonium ferric citrate-impregnated foams are subsequently converted into iron and nitrogen co-doped 2D porous carbon-flakes by pyrolysis at high temperature in an inert atmosphere. The porous carbon-flakes fabricated at 900 °C (MS-Fe-900) possess high surface area (1140.9 m² g⁻¹) and effective Fe/N co-doping (0.22 at.% Fe and 2.02 at.% N). In comparison with Pt/C, MS-Fe-900 exhibits superior ORR activity (E₀ = 968 mV; E_1/2 = 830 mV vs RHE), preferable methanol/CO tolerance and better stability. Furthermore, the MS-Fe-900-based electrode presents high-rate performance (80.1% capacitance retention from 1 to 100 A g⁻¹), and good cycling stability for over 10000 cycles in 6 M KOH electrolyte. This work takes full advantage of the unique structure of biomass and provides a feasible approach to develop cost-efficient and high performance activated carbon materials for ORR electrocatalysis and supercapacitors.

铁和氮共掺杂的二维（2D）多孔碳薄片是通过使用泡沫状的Medulla stachyuri（MS，四叶草的茎髓）作为碳前体和模板以及柠檬酸铁铵作为铁和氮而制得的前体。柠檬酸铁铵浸渍的泡沫随后通过在惰性气氛中高温下热解而转化为铁和氮共掺杂的二维多孔碳薄片。在900°C（MS-Fe-900）制成的多孔碳薄片具有高表面积（1140.9 m ²  g ^-1）和有效的Fe / N共掺杂（0.22 at。％Fe和2.02 at。％N） 。与Pt / C相比，MS-Fe-900表现出优异的ORR活性（E ₀  = 968 mV；Ë _1/2  = 830毫伏VS RHE），优选甲醇/ CO耐受性和更好的稳定性。此外，基于MS-Fe-900的电极在6 M KOH电解质中具有高倍率性能（从1到100 A g ^-1保持80.1％的电容），并具有超过10000次循环的良好循环稳定性。这项工作充分利用了生物质的独特结构，并为开发用于ORR电催化和超级电容器的经济高效的高性能活性炭材料提供了可行的方法。