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Coexisting Single‐Atomic Fe and Ni Sites on Hierarchically Ordered Porous Carbon as a Highly Efficient ORR Electrocatalyst
Author(s) -
Zhu Zhengju,
Yin Huajie,
Wang Yun,
Chuang ChengHao,
Xing Lei,
Dong Mengyang,
Lu YingRui,
CasillasGarcia Gilberto,
Zheng Yonglong,
Chen Shan,
Dou Yuhai,
Liu Porun,
Cheng Qilin,
Zhao Huijun
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202004670
Subject(s) - electrocatalyst , materials science , carbon fibers , chemical engineering , mesoporous material , metal , porosity , catalysis , nanotechnology , inorganic chemistry , electrode , electrochemistry , chemistry , metallurgy , composite material , composite number , organic chemistry , engineering
The development of oxygen reduction reaction (ORR) electrocatalysts based on earth‐abundant nonprecious materials is critically important for sustainable large‐scale applications of fuel cells and metal–air batteries. Herein, a hetero‐single‐atom (h‐SA) ORR electrocatalyst is presented, which has atomically dispersed Fe and Ni coanchored to a microsized nitrogen‐doped graphitic carbon support with unique trimodal‐porous structure configured by highly ordered macropores interconnected through mesopores. Extended X‐ray absorption fine structure spectra confirm that Fe‐ and Ni‐SAs are affixed to the carbon support via FeN 4 and NiN 4 coordination bonds. The resultant Fe/Ni h‐SA electrocatalyst exhibits an outstanding ORR activity, outperforming SA electrocatalysts with only Fe‐ or Ni‐SAs, and the benchmark Pt/C. The obtained experimental results indicate that the achieved outstanding ORR performance results from the synergetic enhancement induced by the coexisting FeN 4 and NiN 4 sites, and the superior mass‐transfer capability promoted by the trimodal‐porous‐structured carbon support.