Pd nanoparticle-modified electrodes for nonenzymatic hydrogen peroxide detection

Abstract

A hydrogen peroxide (H 2 O 2) sensor based on Pd nanoparticles (NPs) and glassy carbon electrodes (GCEs) is fabricated. Pd NPs are deposited on GCEs by using a gas phase cluster beam deposition technique. The NP-deposited electrodes show enhanced electrocatalytic activity in reduction of H 2 O 2. The electrode with an optimized NP coverage of 85 % has a high selective and stable nonenzymatic sensing ability of H 2 O 2 with a low detection limit (3.4 × 10 −7 M), high sensitivity (50.9 μA mM −1), and a wide linear range (from 1.0 × 10 −6 to 6.0 × 10 −3 M). The reduction peak potential of the electrode is close to −0.12 V, which enables high selective amperometric detection of H 2 O 2 at a low applied potential.