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Monodispersed Silica@Nickel Silicate Hydroxide Core–Shell Spheres for Supercapacitor Electrodes
Author(s) -
Yang Tao,
Lu Qingshan,
Zhao Shifeng
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900395
Subject(s) - supercapacitor , nickel , materials science , hydroxide , electrochemistry , chemical engineering , silicate , shell (structure) , hydrothermal circulation , electrode , capacitance , porosity , redox , nanotechnology , composite material , chemistry , metallurgy , engineering
Monodispersed silica@nickel silicate hydroxide core–shell microspheres are prepared using a hydrothermal method. The core–shell microsphere with an average diameter of 525 nm displays a hierarchical structure. The shell with an average thickness of about 40 nm consists of Ni 3 Si 2 O 5 (OH) 4 nanosheets yielding porous surface. Surface‐dependent electrochemical property exhibits a specific capacitance of 356.7 F g −1 at 0.5 A g −1 and a good rate performance, which is attributed to the special core–shell hierarchical structures not only providing abundant electroactive sites for redox reaction but also shortening ion/electron transportation path. The current study provides a simple and efficient way to design low‐cost electrodes for supercapacitors.