Electrodeposition Ni(OH)۲-rGO nanoparticles on carbon paste electrode as a new electrocatalyst for electro oxidation of formaldehyde in Liquid Detergents

We prepared a novel nickel (II) hydroxide modified carbon paste electrode (Ni(OH)۲-rGO/CPE) for the electrocatalytic oxidation of formaldehyde. The electrode was prepared by a simple method without the use of linking chemicals.The prepared (Ni(OH)۲-rGO/CPE) material was characterized by scanning electron microscopy and energy dispersive X‐ray spectrometry. The electrochemical performance of the proposed electrode was investigated using cyclic voltammetry, electrochemical impedance spectroscopy, and chronoamperometry. The results indicate that (Ni(OH)۲-rGO/CPE) exhibits good electrocatalytic activity with regards to formaldehyde oxidation owing to its nanoporous structure and the large surface area of reduced graphene oxide. The values of the electron transfer coefficient and the catalytic rate constant were ۰.۸ and ۵.۱ × ۱۰۴ cm۳/(mol·s), respectively. Therefore, the proposed electrode, which showed remarkable electroactivity with regards to formaldehyde oxidation with long‐term stability and good reproducibility, could be useful in fuel cells.