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Core–Ring Structured NiCo 2 O 4 Nanoplatelets: Synthesis, Characterization, and Electrocatalytic Applications
Author(s) -
Cui Bai,
Lin Hong,
Li JianBao,
Li Xin,
Yang Jun,
Tao Jie
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200700982
Subject(s) - materials science , coprecipitation , electrocatalyst , electrolysis , electrode , hydroxide , nanostructure , ring (chemistry) , electrochemistry , chemical engineering , nanotechnology , inorganic chemistry , chemistry , electrolyte , organic chemistry , engineering
An innovative nanostructure, namely the core–ring structure, is reported in this paper. It occurs in NiCo 2 O 4 nanoplatelets, synthesized by the coprecipitation decomposition method using sodium hydroxide as the precipitant. The yield of core–ring hexagonal NiCo 2 O 4 nanoplatelets is greater than 80% at 200 °C. A high‐resolution transmission electron microscopy and energy dispersive spectroscopy investigation reveals the typical core–ring nanostructure, which shows a strong enrichment of Co in the core with a Co content higher than 80%. A mechanism for the core–ring structure formation is proposed. The core–ring NiCo 2 O 4 can be used as an electrocatalyst for an oxygen evolution reaction (OER) in alkaline water electrolysis. Compared with the electrodes of ordinary NiCo 2 O 4 and Co 3 O 4 , or other NiCo 2 O 4 electrodes prepared by alternate methods, the electrode coated by core‐ring NiCo 2 O 4 nanoplatelets exhibits the greatest electrocatalytic properties, with an over‐potential of 0.315 V at a current density of 100 mA cm −2 .