Kone, Issa Xie, Ao Tang, Yang Chen, Yu Liu, Jia Chen, Yongmei Sun, Yanzhi Yang, Xiaojin Wan, Pingyu Hierarchical Porous Carbon Doped with Iron/Nitrogen/Sulfur for Efficient Oxygen Reduction Reaction Hierarchical porous Fe/N/S-doped carbon with a high content of graphitic nitrogen (FeNS/HPC) has been successfully synthesized by a facile dual-template method. FeNS/HPC shows not only macropores resulting from the dissolution of the SiO<sub>2</sub> template, but abundant mesopores were also obtained after removing the in situ generated Fe<sub>2</sub>O<sub>3</sub> nanoparticles on the ultrathin (∼4 nm) carbon shell of the macropores. Moreover, micropores are produced during the thermal pyrolysis of the carbon precursors. With respect to the electrochemical performance in the oxygen reduction reaction (ORR), FeNS/HPC not only exceeds other prepared porous carbon materials completely but also shows higher onset potential (0.97 vs 0.93 V), half-wave potentials (0.87 vs 0.83 V), and diffusion current density (5.5 vs 5.3 mA cm<sup>–2</sup>) than those of Pt/C. Furthermore, FeNS/HPC also exhibits outstanding stability and methanol tolerance, making it a competent candidate for ORR. The following aspects contribute to its excellent ORR performance. (1) High content of graphitic N (5.1%) and codoping of pyridinic N species, thiophene-S, FeN<i><sub>x</sub></i>, and graphitic carbon-encapsulated iron nanoparticles, providing highly active sites. (2) The hierarchical porous mesh structure with micro-, meso-, and macroporosity, accelerating the mass transfer and facilitating full utilization of the active sites. (3) The high specific surface area (1148 m<sup>2</sup> g<sup>–1</sup>) of the graphitic carbon shell, assuring a large interface and rapid electron conduction for ORR. Efficient Oxygen Reduction Reaction Hierarchical;dual-template method;carbon shell;mesh structure;graphitic nitrogen;Fe 2 O 3 nanoparticles;FeNS;carbon materials;content;graphitic carbon shell;oxygen reduction reaction;electrochemical performance;SiO 2 template;mass transfer;FeN x;electron conduction;carbon precursors;graphitic carbon-encapsulated iron nanoparticles;pyridinic N species;macropore;vs;Hierarchical Porous Carbon Doped;site;ORR performance;methanol tolerance 2017-05-17
    https://acs.figshare.com/articles/journal_contribution/Hierarchical_Porous_Carbon_Doped_with_Iron_Nitrogen_Sulfur_for_Efficient_Oxygen_Reduction_Reaction/5102815
10.1021/acsami.7b02306.s001