Electrochemical investigations of NpO₂²⁺/NpO₂⁺ redox couple at single walled carbon nanotube modified glassy carbon electrode (SWCNT-GC)

Electrochemistry of NpO₂²⁺/NpO₂⁺ couple in 1 M H₂SO₄ was studied on bare and modified glassy carbon (GC) electrodes by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). The modified electrode (SWCNTs-GC) was characterized by scanning electron microscopy (SEM). Electrocatalysis of NpO₂²⁺/NpO₂⁺ redox reaction was observed on SWCNT-GC electrode. The lower charge transfer resistance at SWCNT-GC reflects faster rate of electron transfer reaction of Np(VI)/Np(V) couple. These results are interesting to develop electroanalytical methodologies for neptunium determination using SWCNT modified electrode. To the best of our knowledge, this is the first study on the electrocatalysis of neptunium on SWCNT modified electrode. (author)