Improvement in Efficiency of the Electrocatalytic Reduction of Hydrogen Peroxide by Prussian Blue Produced from the [Fe(CN)5(mpz)]2– Complex

• Published in: European journal of inorganic chemistry Vol. 2017; no. 13; pp. 1979 - 1988
• Main Authors: Monteiro, Marcio C., Toledo, Kalil C. F., Pires, Bruno M., Wick, René, Bonacin, Juliano A.
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 03-04-2017
• Subjects: Efficiency; Electrochemistry; Iron; Ligands; Reduction; Thin films
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201601540

Hydrogen peroxide is one of the most important molecules in chemical signaling in living organisms. Because of this, its sensing is indispensable for the diagnosis of many diseases. Among the materials used for the detection and quantification of H2O2, Prussian Blue (PB) has been highlighted due to its performance. Therefore, the search for alternatives or the improvement of PB performance is a challenge. In this context, our motivation was to evaluate how the ligand N‐methylpyrazinium affects the structure and reactivity of Prussian Blue films produced from [Fe(CN)5(mpz)]2– (PB‐mpz). Based on the results, it was possible to conclude that the ligand is coordinated to the complex inside the PB framework and consequently contributes to the generation of a noncrystalline structure. The ions contained in buffer solutions can react with Prussian Blue by binding to Fe3+ and breaking the structure. In addition, a PB‐mpz film in HCl/KCl showed higher sensitivity towards H2O2 than a PB film.
Molecular films of Prussian Blue produced from the [Fe(CN)5(mpz)]2– complex have a noncrystalline structure that permits their use in the detection of hydrogen peroxide with an improved electrochemical response when compared with Prussian Blue films obtained by traditional methods.