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Single Cobalt Atoms with Precise N‐Coordination as Superior Oxygen Reduction Reaction Catalysts
Author(s) -
Yin Peiqun,
Yao Tao,
Wu Yuen,
Zheng Lirong,
Lin Yue,
Liu Wei,
Ju Huanxin,
Zhu Junfa,
Hong Xun,
Deng Zhaoxiang,
Zhou Gang,
Wei Shiqiang,
Li Yadong
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201604802
Subject(s) - catalysis , cobalt , bimetallic strip , electrocatalyst , carbonization , materials science , carbon fibers , thermal stability , pyrolysis , atomic units , metal , chemical engineering , nanotechnology , chemistry , scanning electron microscope , organic chemistry , composite material , metallurgy , composite number , quantum mechanics , electrochemistry , engineering , electrode , physics
A new strategy for achieving stable Co single atoms (SAs) on nitrogen‐doped porous carbon with high metal loading over 4 wt % is reported. The strategy is based on a pyrolysis process of predesigned bimetallic Zn/Co metal–organic frameworks, during which Co can be reduced by carbonization of the organic linker and Zn is selectively evaporated away at high temperatures above 800 °C. The spherical aberration correction electron microscopy and extended X‐ray absorption fine structure measurements both confirm the atomic dispersion of Co atoms stabilized by as‐generated N‐doped porous carbon. Surprisingly, the obtained Co‐N x single sites exhibit superior ORR performance with a half‐wave potential (0.881 V) that is more positive than commercial Pt/C (0.811 V) and most reported non‐precious metal catalysts. Durability tests revealed that the Co single atoms exhibit outstanding chemical stability during electrocatalysis and thermal stability that resists sintering at 900 °C. Our findings open up a new routine for general and practical synthesis of a variety of materials bearing single atoms, which could facilitate new discoveries at the atomic scale in condensed materials.