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Co/CoO x Nanoparticles Embedded on Carbon for Efficient Catalysis of Oxygen Evolution and Oxygen Reduction Reactions
Author(s) -
Li Min,
Bai Lu,
Wu Shujie,
Wen Xudong,
Guan Jingqi
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201800489
Subject(s) - electrocatalyst , catalysis , oxygen evolution , pyrolysis , electrochemistry , reversible hydrogen electrode , carbon fibers , materials science , chemical engineering , cobalt , nanoparticle , amorphous solid , amorphous carbon , limiting current , oxygen , inorganic chemistry , chemistry , nanotechnology , electrode , working electrode , organic chemistry , composite number , composite material , engineering
The oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are important electrochemical reactions to realize clean energy technologies. Herein, we prepared a hybrid electrocatalyst consisting of Co/CoO x nanoparticles embedded in amorphous carbon through the simple pyrolysis of cobalt‐based zeolitic terephthalate frameworks. The pyrolysis temperature significantly influenced the structure morphology and catalytic behavior. Good contact between Co/CoO x and amorphous carbon resulted in a high catalytic efficiency. The hybrid obtained under pyrolysis temperature of 600 °C exhibited the highest performance for OER, offering a stable current density of 10 mA cm −2 at 277 mV in basic media. Besides good OER behavior, it also showed good ORR performance [onset potential: ∼0.87 V vs. the reversible hydrogen electrode (RHE), diffusion‐limiting current density: ∼4.9 mA cm −2 ]. This work describes a novel and efficient catalyst, and greatly expands the scope of low‐cost Co‐based electrocatalysts for various electrochemical reactions without the need for N‐containing ligands.