Investigating the Effects of Electrode Type and Current Density on the Color Removal Efficiency of Lanthanum Nickelate-based Photoanode

This study explores the photoelectrochemical (PEC) degradation of Methyl Orange (MO) dye in a three-electrode configuration cell consisting of an FTO glass substrate as the working electrode, a platinum counter electrode, and an Ag/AgCl reference electrode. Lanthanum Nickelate (LaNiO₃, LNO) nanostructures were synthesized via electrochemical deposition (ED) and employed as an efficient photoanode in PEC, demonstrating superior dye degradation performance. Critical parameters influencing dye removal including substrate material (Pt, and FTO), operational modes (potentiostat (PS) and galvanostat (GS)), and anodic current density were systematically investigated. The FTO/LNO-PS electrode outperformed the Pt/LNO-PS electrode, achieving higher dye removal efficiency due to its enhanced electron-hole separation and greater active surface area. Moreover, an optimal anodic current density of 1.0 mA/cm² was identified, ensuring efficient dye degradation while mitigating recombination losses. PEC systems using FTO-based electrodes and LNO nanostructures have the potential to provide sustainable and effective wastewater treatment.

Investigating the Effects of Electrode Type and Current Density on the Color Removal Efficiency of Lanthanum Nickelate-based Photoanode Keywords:

Perovskite oxide , LaNieO 3 , Electrochemical deposition , Photoelectrochemical Oxidation , Type of electrode , Current