One-step Route to Fabrication of Pd Nanoparticles Modified Au Electrode and Its Electrocatalytic Activity for Dissolved Oxygen

In this article, we reported a one-step facile route to fabricate Pd-modified porous Au electrode. During fabrication, the surface of a pristine Au microdisk array electrode underwent oxidation, reduction, and Pd deposition while applying three potentials (high, low, or lower, respectively). We optimized the preparation conditions, such as buffer pH and oxidation time. On a preparation condition that 90 s oxidation in phosphate buffer saline solution with pH 7, we obtained a 42-fold larger electroactive surface area at porous electrode than that of bare electrode. Pd nanoparticles (PdNPs) were modified on the porous electrode subsequently, and the loading of Pd could be easily tuned by varying the deposition time. The as-prepared Pd-modified electrode was used for electrocatalytic reduction of dissolved oxygen, and this showed a sensitivity of 0.1 mA L cm−2 mg−1. The one-step facile route of fabrication is convenient, environmentally benign, and a promising method to prepare PdNPs-modified porous Au electrode.