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Iron‐Nitrogen Co‐doped Carbon with a Tunable Composition as Efficient Electrocatalysts for Oxygen Reduction
Author(s) -
Liu Wendong,
Zhang Chenghui,
Zhang Yuxuan,
Jiang Yuanyuan,
Chen Chuanxia,
Ni Pengjuan,
Wang Bo,
Lu Yizhong
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202001485
Subject(s) - carbon fibers , catalysis , pyrolysis , oxygen reduction , methanol , electrocatalyst , materials science , metal , oxygen , nitrogen , oxygen reduction reaction , chemical engineering , doping , inorganic chemistry , chemistry , metallurgy , electrode , electrochemistry , composite material , composite number , organic chemistry , optoelectronics , engineering
Understanding the relationship between composition and activity is essential for the rational design of metal‐nitrogen‐Carbon (M−N−C) electrocatalysts for the oxygen reduction reaction (ORR). Here, a series of Fe‐N co‐doped porous carbon (Fe‐N−C) electrocatalysts are successfully prepared through the pyrolysis of ZIF‐8 doped with different amount of hemin. The catalyst (Fe 55 ‐N−C) exhibits impressive ORR performance with an onset potential ( E onset ) of 1.02 V (vs. RHE) and a half‐wave potential ( E 1/2 ) of 0.892 V in alkaline media, outperforming commercial Pt/C. Meanwhile, the average kinetic current density ( J k ) of Fe 55 ‐N−C at 0.850 V is 17.5 mA cm −2 , which is 3.3‐fold higher than that of commercial Pt/C. Besides, it also delivers anti‐methanol poisoning ability and high durability. The high performance stems from the hierarchical porous structure, large specific surface area, and high dispersion of Fe‐N x active sites in Fe 55 ‐N−C. These findings could inspire new perspectives for rationally designing and synthesizing economical and practical non‐precious‐metal oxygen reduction electrocatalysts.