Abstract
AbstractIn this study, a novel one‐dimensional iron‐based nitrogen‐doped carbon nanotube (N‐CNT) nanocomposite (Fe/Fe2.5C/Fe3N/N‐CNT) was successfully synthesized in situ by using a facile and low‐cost method. In alkaline media, the typical product (Fe/Fe2.5C/Fe3N/N‐CNT‐30) showed an good onset potential (Eonset=0.93 V vs RHE), half‐wave potential (E1/2=0.79 V vs RHE), and current density (J=6.62 mA cm−2 at 0.2 V vs RHE), especially compared to the commercial 20 % Pt/C catalyst (0.95 V, 0.82 V, 5.61 mA cm−2, respectively). In acidic medium, it also exhibits a good oxygen reduction reaction (ORR) activity. Moreover, Fe/Fe2.5C/Fe3N/N‐CNT‐30 exhibited superior long‐term durability and methanol tolerance compared to Pt/C in both alkaline and acidic media. The excellent electrocatalytic performance of this material is attributed to the abundant carbon defects in the carbon structure, the high content doping of pyridinic N and graphitic N into the CNTs, the multi‐model Fe species as active sites, and the fact that most Fe species within the CNTs avoid corrosion from electrolyte. This study paves a new way for highly active ORR electrocatalysts and promotes the rapid development of CNTs in some frontier fields.
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