Simultaneous formation of Prussian Blue and copper hexacyanoferrate from a solution of Cu²⁺ and K₃[Fe(CN)₆] in presence of HAuCl₄
2013
Sharma, Manoj K. | Aggarwal, Suresh K.
An investigation predominantly by electrochemical techniques is conducted on copper hexacyanoferrate (CuHCF) film deposition on glassy carbon (GC) electrode from a solution of Cu²⁺ and [Fe(CN)₆]³⁻ ions in presence of HAuCl₄. We observed that the potentiodynamic electrosynthesis of CuHCF from KNO₃ solution containing Cu²⁺ and [Fe(CN)₆]³⁻ ions resulted in the co-deposition of Prussian Blue (PB), if HAuCl₄ was present in the solution. The observations were supported by electrochemical techniques and UV–Visible spectroscopy. Recently, Yu et al. (J. Electroanal. Chem., 2010) reported potentiodynamic electrosynthesis of compact and uniform CuHCF nanoparticles on GC electrode under the synergic action of EDTA and HAuCl₄ from a solution containing Cu²⁺, K₃[Fe(CN)₆], EDTA and HAuCl₄ by cycling the electrode potential between 0.9V and −0.2V. HAuCl₄ was used to improve the deposition of CuHCF on the electrode surface. However, Yu et al. did not report the formation of PB during the potential cycling on GC electrode in a supporting electrolyte solution containing Cu²⁺, K₃[Fe(CN)₆], EDTA and HAuCl₄. Therefore, the present investigation is of more interest and importance as the potentiodynamic electrosynthesis of PB on GC electrode was reported from an acidic solution of K₃[Fe(CN)₆] in presence of HAuCl₄ by cycling the potential between 0.0V and 1.0V (Senthil Kumar et al. Chem. Mater., 2007). These finding demonstrated that it is not possible to electrosynthesise a “pure” CuHCF by potentiodynamic method from a solution of Cu²⁺, [Fe(CN)₆]³⁻ and AuCl₄ ⁻ ions, because PB is deposited during the synthesis.
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