Multifunctional CeO2:Fe3+ electrodes: Superior uric acid sensing and high-efficiency supercapacitor application

• Published in: Inorganic chemistry communications 2024-12, Vol.170, p.113449, Article 113449
• Main Authors: Nadar, Nandini Robin, Deepak, J., Sharma, S.C., Radha Krushna, B.R., Pruthviraj, I.S., Shivaraj Maidur, Rev, Sridhar, Chitathoor, Ray, Subashree, Sudarmani, R., Ravi Kumar, R., Nagabhushana, H.
• Format: Article
• Language: English
• Subjects: Electrochemical sensors; Energy storage; Iron-doped CeO2; Modified electrodes; Uric acid detection
• ISSN: 1387-7003
• DOI: 10.1016/j.inoche.2024.113449

[Display omitted] •Fe doped CeO2 (FCO) nanoparticles are synthesized via combustion technique.•FCO MCPE shows a 29 % higher anodic peak current than BCPE in CV.•Excellent UA detection with LOD at 0.132 µM and R2 = 0.999 using DPV method.•Specific capacitance of 200.43 F g−1 with 87.5 % retention after 5000 cycles. This study investigates the versatile capabilities of iron-doped CeO2-modified carbon paste electrodes (FCO MCPE) for both enhanced uric acid (UA) detection and efficient energy storage applications. Iron-doped CeO2 nanoparticles were synthesized via combustion synthesis. Cyclic voltammetry (CV) showed a 29 % increase in anodic peak current (2.05 µA) with the FCO MCPE compared to bare carbon paste electrodes (BCPE) (1.59 µA), indicating improved catalytic properties. Analysis of scan rates revealed a diffusion-controlled oxidation process. Differential pulse voltammetry (DPV) demonstrated excellent linearity (R2 = 0.999) and low detection limits (LOD: 0.132 µM, LOQ: 0.442 µM). Selectivity tests confirmed the superior ability of the FCO MCPE to differentiate UA from dopamine (DA), with a high linearity (R2 = 0.998). Stability tests showed only an 11 % decrease in performance after 15 cycles. In super capacitor evaluations, FCO materials exhibited a high specific capacitance of 200.43 F g−1 at 2 mV/s and impressive cycling stability with 87.5 % capacitance retention after 5000 cycles. Electrochemical impedance spectroscopy (EIS) revealed efficient charge transfer with a peak specific capacitance of 52.39 F g−1 at 0.01 Hz. These findings underscore the potential of FCO MCPEs for both effective UA detection and efficient super capacitor applications.