Electrochemistry of TiO2–iron hexacyanocobaltate composite electrodes

• Titanium dioxide–Iron hexacyanocobaltate composite electrode synthesis is proposed.
• Titanium dioxide semiconductor is a suitable electronic and structural mediator.
• The stability and adherence of iron hexacyanocobaltate is considerably increased.
• TiO2 in anatase phase is interesting in photocatalytic and photovoltaic devices.
• Iron hexacyanocobaltate and cobalt hexacyanoferrate electrochemistry is compared.

In this paper we investigate the electrochemical behavior of iron hexacyanocobaltate (FeHCC) in comparison to the cobalt hexacyanoferrate (CoHCF). The best results were achieved on electrochemical synthesized film of FeHCC on the TiO2 modified electrodes. The chemical and physical characterizations confirm the formation of the FeHCC with the classical cubic crystal structure of the Prussian blue analogs, with cell parameter a very close to 10 Å, as well as the formation of micro aggregates of TiO2 covered by FeHCC. The synthesis was performed on various substrates such as glassy carbon (GC), graphite foil (GF) and indium tin oxide (ITO) in order to develop new technological applications.