Synthesis of Hollow Co–Fe Prussian Blue Analogue Cubes by using Silica Spheres as a Sacrificial Template

Alowasheeir Azhar, Mohamed B. Zakaria, El Zeiny M. Ebeid, Toyohiro Chikyow, Yoshio Bando, Abdulmohsen Ali Alshehri, Yousef Gamaan Alghamdi, Ze Xing Cai, Nanjundan Ashok Kumar, Jianjian Lin, Hansu Kim, Yusuke Yamauchi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)599-603
Number of pages5
Issue number8
Publication statusPublished - 2018 Aug
Externally publishedYes


  • Prussian blue analogues
  • batteries
  • coordination polymers
  • crystal growth
  • hollow structures

ASJC Scopus subject areas

  • Chemistry(all)


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