Electrochemical Analysis: Fabrication and evaluation of Ag/Ni catalysts based on TiO2 nanotubes for sodium borohydride oxidation

In this research, titanium dioxide nanotubes (TiO2-NTs) were synthesized by anodization on a titanium (Ti) sheet. Then, nickel (Ni), silver (Ag), and Ag/Ni nanoparticles were deposited on TiO2-NTs via electrochemical deposition. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the synthesis of TiO2-NTs and nanoparticles deposited on TiO2-NTs. SEM images and XRD data indicated that the nanotubes were well synthesized, and the Ni, Ag, and Ag(Ni) particles were well dispersed on their surfaces. In the next step, the electrocatalytic activity of the synthesized catalysts (TiO2-NTs, Ni/TiO2-NTs, Ag/TiO2-NTs and Ag (Ni)/TiO2-NTs) in relation to NaBH4 (at four concentrations 0.00, 0.01, 0.03 and 0.05 M of NaBH4) oxidation were examined by various methods including: chronoamperometry (CA), chornopotantiometry (CP), cyclic voltametry (CV), linear sweep voltametry (LSV). These experiments showed that bimetallic electrocatalysts (Ag(Ni)/TiO2-NTs) are more efficient than monometallic electrocatalysts. The results showed that bimetallic electrodes are more efficient in the electrooxidation of borohydrate.