Structural Morphological and Electrochemical Investigations of Pristine Ceria and Pt-Doped Ceria Electrocatalyst for Enhanced Supercapacitor Performance

This research article focuses on the facile fabrication of pristine cerium oxide (p-CeO2) and platinum-doped cerium oxide (Pt-CeO2) electrocatalyst via chemical reduction method to achieve enhanced specific capacitance for supercapacitor applications in energy storage devices. X-ray diffraction and Scanning Electron Microscopy describe the crystallite size 22 nm of porous heterostructure Pt-CeO2. Electrochemical investigations of the synthesized Pt-CeO2 showed excellent performance as an electrode material for supercapacitor devices. The Pt-CeO2 electrode showed a specific capacity of 542.5 C g−1 and a specific capacitance of 1550 F g−1 at a current density of 0.5 A g−1 compared to p-CeO2 (51 C g−1 and 145 F g−1, respectively). The material also depicts the minimum charge transfer resistance of 618.42 mΩ. The kinetic analysis (b = 0.62, R2 = 0.98) was performed to clarify the super capacitive charge storage mechanism, indicating that the process was predominantly diffusion control. The Pt-CeO2 exhibited remarkable diffusive contributions of 82% and capacitive contributions of 18% at a scan rate of 5 mV s−1. The electrode showed significant cycling stability, retaining 97.16% of its original capacitance after 5000 Galvanic charge discharge cycles (GCD).