Aluminosilicate nanoparticles decorated by copper hexacyanoferrate as a good electrocatalyst for non-enzymatic hydrogen peroxide sensing

In this work, porous amorphous aluminosilicates nanoparticles (PAS NPs) have been synthesized by the sol-gel method. The crystals particle sizes of PAS NPs were about 90 nm by SEM. Carbon paste modified PAS NPs/Cu (CPE/PAS NPs/Cu) was placed into a potassium hexacyanoferrate solution by continuous cycling of the potential for deposition of copper hexacyanoferrate (CuHCF) at the surface of CPE/PAS NPs/Cu. The cyclic voltammograms of CPE/PAS NPs/CuHCF show two pairs (Fe(CN)(6)(3-)/Fe(CN)(6)(4-) and Cu2+/Cu+) of redox couples due to the system. The total surface coverage of immobilized CuHCF was calculated at about 1.65 x 10(-7) mol cm(-2). Finally, this modified electrode responded to the different concentrations of hydrogen peroxide. The linear range and limit of detection (LOD) were 0.8-1.8 x 10(2) mu mol L-1 and 0.65 mu mol L-1, respectively. The fabrication of this electrode is easy and it is simple and low-cost. The stability, reproducibility, and repeatability of this modified electrode are acceptable.