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-CeO 2 ) and platinum-doped cerium oxide (Pt-CeO 2 ) 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-CeO 2 . Electrochemical investigations of the synthesized Pt-CeO 2 showed excellent performance as an electrode material for supercapacitor devices. The Pt-CeO 2 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-CeO 2 (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, R 2 = 0.98) was performed to clarify the super capacitive charge storage mechanism, indicating that the process was predominantly diffusion control. The Pt-CeO 2 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).