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Hollow Carbon@NiCo 2 O 4 Core–Shell Microspheres for Efficient Electrocatalytic Oxygen Evolution
Author(s) -
Wu Xiujuan,
Wu Xingqiang,
Lee Husileng,
Ye Qilun,
Wang Xiaoxiao,
Zhao Yimeng,
Sun Licheng
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800919
Subject(s) - tafel equation , overpotential , oxygen evolution , nanosheet , materials science , chemical engineering , conductivity , carbon fibers , electrical resistivity and conductivity , catalysis , transition metal , current density , oxygen , nanotechnology , electrode , chemistry , electrochemistry , composite material , physics , electrical engineering , organic chemistry , quantum mechanics , composite number , engineering , biochemistry
Earth‐abundant transition metal oxides are considered one of the most promising oxygen evolution reaction (OER) catalysts. However, their intrinsically low electrical conductivity inhibits the fast kinetics for OER. To overcome this drawback, hollow carbon@NiCo 2 O 4 core–shell microspheres (C@NiCo 2 O 4 HSs) are synthesized with enhanced electrocatalytic activity and stability toward OER. The prepared C@NiCo 2 O 4 /Ni foam delivers a current density of 10 mA cm −2 at a small overpotential of 268 mV and exhibits a low Tafel slope of 54 mV dec −1 . The enhanced OER performance is attributed to the enlarged specific surface area induced by the combination effect between the 1D nanosheet structure and the 3D hollow microsphere structure, and the improved electrical conductivity is ascribed to the carbon core support.