An Electrochemical Sensor for Hydrazine Based on <italic>In Situ</italic> Grown Cobalt Hexacyanoferrate Nanostructured Film

Abstract

There is a growing demand for simple, cost-effective, and accurate analytical tools to determine the concentrations of biological and environmental compounds. In this study, a stable electroactive thin film of cobalt hexacyanoferrate (Cohcf) was prepared as an in situ chemical precipitant using electrostatic adsorption of Co 2 + on a silicate sol-gel matrix (SSG)-modified indium tin oxide electrode pre-adsorbed with [Fe(CN) 6 ] 3 − ions. The modified electrode was characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical techniques. Electrocatalytic oxidation of hydrazine on the modified electrode was studied. An electrochemical sensor for hydrazine was constructed on the SSG-Cohcf-modified electrode. The oxidation peak currents showed a linear relationship with the hydrazine concentration. This study provides insight into the in situ growth and stability behavior of Cohcf nanostructures and has implications for the design and development of advanced electrode materials for fuel cells and sensor applications.

Interfacing Silicate Layer Between MoO3 Ribbon and Pt Metaldots Boosts Methanol Oxidation Reaction

“…4. STEM-EDX elemental composition analysis of MoO agent the metal precursors were reduced into sub-2 nm sized Pt MDs and stabilized/embedded by the silicate layer since the 3D silicate sol-gel matrices are well-known candidates for offering a stable environment for metal NPs [24][25][26][27][28][29][30][31]. In addition, porous channels of the silicate layer would enhance mass transport from a electrolyte and electronic access between bare MoO 3 and Pt.…”

Shape‐controlled Electrodeposition of Standing Pt Nanoplates on Gold Substrates as a Sensor Platform for Nitrite Ions

“…20 Ultimately, electrodeposition technique would come into the picture and due to the intricacy of the electrode/electrolyte boundary and nonuniformity of the resultant materials; shape-controlled electrodeposition remains a prodigious task. However, for specific applications, e.g., miniature device and sensor platforms are in need of active immobilization, good electrical contact and crystal facets exposed onto the substrates.…”

“…However, for specific applications, e.g ., miniature device and sensor platforms are in need of active immobilization, good electrical contact and crystal facets exposed onto the substrates. Thus, straight forward deposition of nanomaterials onto the solid support is more reasonable rather than processing with the solution phase synthesized nanomaterials . Ultimately, electrodeposition technique would come into the picture and due to the intricacy of the electrode/electrolyte boundary and non‐uniformity of the resultant materials; shape‐controlled electrodeposition remains a prodigious task.…”

Electrodeposition of AuPt Alloy Nanostructures on a Biotemplate with Hierarchically Assembled M13 Virus Film Used for Methanol Oxidation Reaction

“…Extensive research has shown the utility of gold (Au), platinum (Pt) and AuPt alloy nanoparticles (NPs) as the highly active and stable catalytic materials for various applications [13][14][15][16]. In particular, AuPt NPs are of widely studied as catalysts for fuel cells, hydrogenation and oxidation of organic compounds, degrading the environment pollutants and electrochemical oxidation of small organic molecules which are suitable for fuel cell applications [10].…”