title: Isolated Single Iron Atoms Anchored on N-Doped Porous Carbon as an Efficient Electrocatalyst for the Oxygen Reduction Reaction.
abstract: The development of low-cost, efficient, and stable electrocatalysts for the oxygen reduction reaction (ORR) is desirable but remains a great challenge. Herein, we made a highly reactive and stable isolated single-atom Fe/N-doped porous carbon (ISA Fe/CN) catalyst with Fe loading up to 2.16 wt %. The catalyst showed excellent ORR performance with a half-wave potential (E1/2) of 0.900 V, which outperformed commercial Pt/C and most non-precious-metal catalysts reported to date. Besides exceptionally high kinetic current density (Jk) of 37.83 mV cm-2at 0.85 V, it also had a good methanol tolerance and outstanding stability. Experiments demonstrated that maintaining the Fe as isolated atoms and incorporating nitrogen was essential to deliver the high performance. First principle calculations further attributed the high reactivity to the high efficiency of the single Fe atoms in transporting electrons to the adsorbed OH species.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Yuanjun
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Shufang
authors.initials: S
authors.lastname: Ji
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Yanggang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.
authors.forename: Juncai
authors.initials: J
authors.lastname: Dong
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Wenxing
authors.initials: W
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Rongan
authors.initials: R
authors.lastname: Shen
authors.affiliation: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.
authors.forename: Lirong
authors.initials: L
authors.lastname: Zheng
authors.affiliation: State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
authors.forename: Zhongbin
authors.initials: Z
authors.lastname: Zhuang
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Dingsheng
authors.initials: D
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, 100084, China.
authors.forename: Yadong
authors.initials: Y
authors.lastname: Li
keywords: electrocatalysts; iron; oxygen reduction reaction; porous carbons; single-atom catalysts