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Self‐Supported ZIF‐Derived Co 3 O 4 Nanoparticles‐Decorated Porous N‐Doped Carbon Fibers as Oxygen Reduction Catalyst
Author(s) -
Song Li,
Tang Jing,
Wang Tao,
Wu Chao,
Ide Yusuke,
He Jianping,
Yamauchi Yusuke
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201900197
Subject(s) - catalysis , materials science , aqueous solution , nanoparticle , electrocatalyst , electrochemistry , chemical engineering , electrolyte , oxygen , electrospinning , carbon fibers , inorganic chemistry , chemistry , nanotechnology , electrode , composite material , organic chemistry , composite number , polymer , engineering
Oxygen reduction is a significant cathodic reaction in the state‐of‐art clean energy devices such as fuel cell and metal–oxygen battery. Here, ZIF‐incorporated hybrid polymeric fibres have been fabricated by using a dual‐phase electrospinning method. These are then transformed into Co 3 O 4 ‐nanoparticle‐decorated porous N‐doped carbon fibres (ZIF‐Co 3 O 4 /NCF) through multi‐step annealing treatment. The resultant ZIF‐Co 3 O 4 /NCF is interweaved into a self‐supported film and can be used as a bi‐functional catalyst for catalysing oxygen reduction in both aqueous and non‐aqueous electrolytes. Electrochemical tests demonstrate that ZIF‐Co 3 O 4 /NCF displays a high catalytic activity for oxygen reduction with a half‐wave potential ( E 1/2 ) of 0.813 V (vs. RHE) and an almost favourable four‐electron reduction pathway in alkaline medium. ZIF‐Co 3 O 4 /NCF catalyst only shows 4 mV negative shift of E 1/2 after 5000 continuous CV cycles. In addition, the ZIF‐Co 3 O 4 /NCF can be applied as the cathode catalyst of non‐aqueous Li–O 2 battery, exhibiting a remarkable ORR activity in LiPF 6 contained 1,2‐dimethoxyethane electrolyte. The excellent electrocatalytic performance of ZIF‐Co 3 O 4 /NCF is probably due to the abundance of active sites of graphitic carbon‐wrapped Co 3 O 4 nanoparticles, as well as the cross‐linked fibrous nitrogen‐doped carbon texture.