Evaluation of activity and stability of platinum-titanium nanoparticles supported on carbon versus oxygen reduction reaction

This study presents a comprehensive analysis of the electrochemical behavior of platinum-carbon (Pt-C) catalysts in the context of the Oxygen Reduction Reaction (ORR) using Rotating Disk Electrode (RDE) methodology. The investigation was conducted in environments saturated with Argon and Oxygen to understand the catalyst's activity and stability under ORR conditions. The experimental setup included the preparation of catalyst inks, deposition on electrodes, and electrochemical measurement using a three-electrode system in HClO4 0.1 M saturated solution. A series of techniques such as Linear Sweep Voltammetry (LSV), Cyclic Voltammetry (CV), and Electrochemical Impedance Spectroscopy (EIS) were employed to evaluate the catalyst's performance. Key parameters like kinetic current, Mass Activity (MA), Specific Activity (SA), and Electrochemical Platinum Surface Area (EPSA) were thoroughly analyzed to determine the catalyst's efficiency and reaction kinetics. The study also delved into the Tafel plot analysis and Koutecky-Levich Equation to comprehend the fundamental mechanisms and electron transfer processes governing the ORR. The findings highlight the catalyst's behavior under different operational conditions, offering insights into the Pt-C catalyst's electrochemical properties and its potential implications for fuel cell technology. This research contributes to the broader understanding of Pt-C catalysts in ORR applications, emphasizing the need for advanced materials and techniques to enhance energy conversion systems' efficiency and sustainability.