Molten-salt-composite of Pyrite and Silver Nanoparticle as Electrocatalyst for Hydrogen Peroxide Sensing

Abstract

A conductive molten salt was synthesized by using natural pyrite (PR) and silver nanoparticles (Ag) at 450°C using a molten salt method. The molten-salt-composite (PR/Ag) was used as an electrocatalyst to detect hydrogen peroxide (H2O2). The as-prepared PR/Ag possessed higher conductivity than natural PR. It exhibited a high sensitivity of 603.54 μA mM -1 cm -2 for the detection of H2O2, with a linear range of 0.1 to 30 mM, and a detection limit of 0.02 mM (S/N = 3). In addition, the PR/Ag sensor exhibited good selectivity to H2O2, resisting interference from other potential interferent compounds (e.g. uric acid, glucose, fructose and common metal ions (K + , Mg 2+ , Na + )). The approach is considered to provide a sensitive, selective, and reliable tool for highly detection of H2O2.

A Carbon Black-Doped Chalcopyrite-Based Electrochemical Sensor for Determination of Hydrogen Peroxide

“…Alkaline is not suitable for H 2 O 2 based electrochemical sensors because of the extra reactions between base and H 2 O 2 which interferes the detection accuracy. In addition, strong acidic and alkaline solutions are not desirable from the view point of application [43]. Therefore, pH 7 was chosen in the following experiments.…”