A High-Performance Electrochemical Sensor based on FeTiO3 Synthesis Coated on Conductive Substrates

Conductor substrate-coating ilmenite (FeTiO3) electrodes developed for electrochemical sensors was investigated to high the photocurrent response, which influenced by transfer of electrons for photoelectrocatalytic processes. A highly ordered electrochemical process to obtain the electron response was employed as modeling reduction-oxidation (redox) reactions on working electrodes. This study utilized conductor substrates, i.e., indium tin oxide (ITO), titanium (Ti) plate, and TiO2/Ti then coated with FeTiO3 sol-gel. The results investigated the resistivity determined in ITO, Ti plate, TiO2/Ti, FeTiO3/ITO, FeTiO3/Ti, and FeTiO3.TiO2/Ti electrodes were 21.30 Ω, 0.37 Ω, 5.17 Ω, 117.04 Ω, 31.07 Ω, and 51.24 Ω, respectively. The Ti plate was a better conductor substrate than ITO was indicated by the highest performance with linear sweep voltammetry (LSV) and cyclic voltammetry (CV) methods. The FeTiO3.TiO2/Ti electrode performance had the highest activity compared with TiO2/Ti electrode as shown by photocurrent values of 1200 µA and 600 µA, respectively. This phenomenon indicates the photocurrent response of FeTiO3.TiO2/Ti possesses voltammogram stability for modeling the redox reactions. More importantly, this study to approach of chemical oxygen demand (COD) determination using FeTiO3 synthesized as modeling natural FeTiO3 extracted from mineral sands.