Open AccessSynthesis of Hollow Co–Fe Prussian Blue Analogue Cubes by using Silica Spheres as a Sacrificial Template
Author(s) -
Azhar Alowasheeir,
Zakaria Mohamed B.,
Ebeid ElZeiny M.,
Chikyow Toyohiro,
Bando Yoshio,
Alshehri Abdulmohsen Ali,
Alghamdi Yousef Gamaan,
Cai ZeXing,
Kumar Nanjundan Ashok,
Lin Jianjian,
Kim Hansu,
Yamauchi Yusuke
Publication year - 2018
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.201800120
Subject(s) - prussian blue , materials science , electrochemistry , hydrofluoric acid , template , nanostructure , nanotechnology , electrode , electrolyte , chemical engineering , etching (microfabrication) , chemistry , metallurgy , layer (electronics) , engineering
Herein, we report a novel method for the formation of hollow Prussian blue analogue (CoFe–PBA) nanocubes, using spherical silica particles as sacrificial templates. In the first step, silica cores are coated by a CoFe–PBA shell and then removed by etching with hydrofluoric acid (HF). The cubic shape of CoFe–PBA is well‐retained even after the removal of the silica cores, resulting in the formation of hollow CoFe–PBA cubes. The specific capacity of the hollow CoFe–PBA nanocubes electrodes is about two times higher than that of solid CoFe–PBA nanocubes as storage materials for sodium ions. Such an improvement in the electrochemical properties can be attributed to their hollow internal nanostructure. The hollow architecture can offer a larger interfacial area between the electrolyte and the electrode, leading to an improvement in the electrochemical activity. This strategy can be applied to develop PBAs with hollow interiors for a wide range of applications.