High-temperature pyrolyzed FeN_x/C catalyst is one of the most promising nonprecious metal electrocatalysts for oxygen reduction reaction (ORR). However, it suffers from two challenging problems: insufficient ORR activity and unclear active site structure. Herein, we report a FeN_x/C catalyst derived from poly-m-phenylenediamine (PmPDA-FeN_x/C) that possesses high ORR activity (11.5 A g^–1 at 0.80 V vs RHE) and low H₂O₂ yield (<1%) in acid medium. The PmPDA-FeN_x/C also exhibits high catalytic activity for both reduction and oxidation of H₂O₂. We further find that the ORR activity of PmPDA-FeN_x/C is not sensitive to CO and NO_x but can be suppressed significantly by halide ions (e.g., Cl^–, F^–, and Br^–) and low valence state sulfur-containing species (e.g., SCN^–, SO₂, and H₂S). This result reveals that the active sites of the FeN_x/C catalyst contains Fe element (mainly as Fe^III at high potentials) in acid medium.

                我的代表作，间苯二胺用于氧还原电催化剂的制备。