研究目的
To prepare and study the properties of Co3O4-doped TiO2 nanotube array electrodes for supercapacitor applications, focusing on the effects of Co content, annealing temperature, and testing electrolyte on electrochemical performance.
研究成果
Co3O4 doping significantly enhances the areal capacitance of TiO2 nanotube arrays. Optimal conditions are 9% Co content, 100 °C annealing, and 0.5 M Na2SO4 electrolyte, yielding a high capacitance of 937.9 μF cm?2 at 10 mV s?1, good rate performance, and 92.3% capacitance retention after 3000 cycles. This method improves conductivity and stability for supercapacitor electrodes.
研究不足
The study is limited to specific Co contents (3%, 6%, 9%), annealing temperatures (100–500 °C), and electrolytes (Na2SO4, KOH). The method may not be scalable for industrial applications, and the performance in other electrolytes or under different conditions was not explored.
1：Experimental Design and Method Selection:
Co3O4-doped TiO2 nanotube arrays were prepared by anodizing Co–Ti alloys in an ethylene glycol solution containing NH4F and H2O, using a platinum foil cathode. The anodization was conducted at 30 V and 40 °C for 3 hours with stirring. Samples were annealed at various temperatures and characterized for morphology, composition, structure, and electrochemical properties.
2：Sample Selection and Data Sources:
Co–Ti alloys with Co contents of 3%, 6%, and 9% (mole ratio) were prepared by powder metallurgy, cut into foils, polished, and cleaned. Pure TiO2 nanotube arrays were also prepared for comparison.
3：List of Experimental Equipment and Materials:
Equipment includes SEM (Quanta 450 FEG), XPS (ESCALAB 250Xi), XRD (D/MAX-2500), electrochemical workstation (CHI660e), platinum foil, saturated calomel electrode (SCE), and magnetic stirrer. Materials include ethylene glycol, NH4F, H2O, Na2SO4, KOH, and deionized water.
4：Experimental Procedures and Operational Workflow:
Anodization was performed, followed by rinsing and drying. Samples were annealed at different temperatures (100–500 °C). Characterization involved SEM, XPS, XRD, and electrochemical tests (CV, GCD, EIS) in a three-electrode setup with Na2SO4 or KOH electrolyte.
5：Data Analysis Methods:
Areal capacitance was calculated from CV curves. EIS data were fitted to equivalent circuits to determine charge-transfer resistance and Warburg impedance. Cycling performance was evaluated over 3000 cycles.
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