Unveiling Electrochemical Frontiers: Enhanced Hydrazine Sensing with Na₃[Fe(CN)₅(PZT)] Modified Electrodes

Author(s)

Toledo, Kalil Cristhian Figueiredo ; Bonacin, Juliano Alves

• Document type: Journal article
• Source: INORGANICS; v. 13, n. 3, p. 21-pg., 2025-03-15.

Abstract

This study presents the synthesis, electrochemical characterization, and sensor application of Na3[Fe(CN)5(PZT)], a novel pentacyanidoferrate-based coordination compound incorporating 2-pyrazinylethanethiol (PZT) as a ligand. Unlike conventional Prussian blue analogues, this system exhibits enhanced electrocatalytic properties due to its unique ligand framework, which contributes to increased charge transfer efficiency and stability. The complex was synthesized via a controlled ligand substitution reaction, followed by UV-Vis and IR spectroscopy confirmation of its successful formation. The electrochemical properties of the Na3[Fe(CN)5(PZT)] complex were investigated using cyclic voltammetry (CV), differential pulse voltammetry (DPV), square-wave voltammetry (SWV), and electrochemical impedance spectroscopy (EIS). Notably, the modified electrodes exhibited improved charge transfer kinetics and catalytic activity, making them promising candidates for electrochemical sensing applications. The Na3[Fe(CN)5(PZT)]-modified electrode demonstrated outstanding electrocatalytic performance towards hydrazine oxidation, exhibiting a low detection limit of 7.38 x 10-6 M, a wide linear response range from 5 to 64 mu mol L-1, and high sensitivity. The proposed system enables precise quantification of hydrazine with high selectivity, positioning Na3[Fe(CN)5(PZT)] as an effective electrochemical mediator for advanced sensing platforms. These findings provide new insights into the design of next-generation Prussian blue analogue-based sensors with superior analytical performance. (AU)

• FAPESP's process: 18/21489-1 - Supramolecular nanotechnology: design, materials and devices
• Grantee: Henrique Eisi Toma
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/11631-2 - CINE: computational materials design based on atomistic simulations, meso-scale, multi-physics, and artificial intelligence for energy applications
• Grantee: Juarez Lopes Ferreira da Silva
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 21/09016-3 - Structural and electronic characterization of biogenic molecules emitted by the Amazon flora
• Grantee: Kaline Rabelo Coutinho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/04523-1 - Activation of OER catalysts based on binuclear ruthenium complexes by hydrogen bonding groups
• Grantee: Kalil Cristhian Figueiredo Toledo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/50129-0 - Hybrid nanomaterials and nanosystems for solar fuel production
• Grantee: Koiti Araki
• Support Opportunities: Regular Research Grants