研究目的
Investigating the effect of thermal condensation temperature on the electrochemical capacitive properties of g-C3N4 supported on reduced TiO2 nanowires/nanotubes array for supercapacitor applications.
研究成果
The CN(450)/rTWTA/Ti electrode demonstrated the highest specific capacitance (22 mF/cm2) and excellent cyclic stability (96.8% retention after 500 cycles), attributed to higher nitrogen content, more active sites, improved hydrophilicity, and three-dimensional morphology. This identifies 450 °C as the optimal thermal condensation temperature for g-C3N4 in supercapacitors, suggesting future research should focus on scaling and application in energy storage systems.
研究不足
The study is limited to specific temperature ranges (450-650 °C) and materials (melamine-derived g-C3N4 on rTWTA/Ti); potential optimizations could include exploring other precursors, temperatures, or support materials to enhance performance.
1：Experimental Design and Method Selection:
The study involved synthesizing g-C3N4 materials at different temperatures (450, 550, 650 °C) via thermal condensation of melamine, depositing them on electrochemically reduced TiO2 nanowires/nanotubes arrays (rTWTA)/Ti substrate, and evaluating their supercapacitive performance using electrochemical measurements.
2：Sample Selection and Data Sources:
Samples included g-C3N4 materials (CN(450), CN(550), CN(650)) and rTWTA/Ti electrodes, prepared as described. Data were obtained from characterization techniques and electrochemical tests.
3：List of Experimental Equipment and Materials:
Equipment included a muffle furnace for thermal condensation, electrochemical cells for reduction and measurements, FESEM (TeScan-Mira III), XRD (Bruker D8 Advanced), FTIR (Bruker VERTEX 70), elemental analyzer (Vario max, Elementar), and electrochemical workstations (SAMA 500, Ivium potentiostat/galvanostat). Materials included melamine, Ti plates, ethylene glycol, NH4F, H2O, Na2SO4, isopropanol, Nafion solution.
4：Experimental Procedures and Operational Workflow:
Steps included preparation of rTWTA/Ti electrode by anodization and electrochemical reduction, synthesis of g-C3N4 by heating melamine at specified temperatures, fabrication of g-C3N4/rTWTA/Ti electrodes by drop-casting, and characterization via FESEM, XRD, FTIR, elemental analysis, CV, GCD, and EIS.
5：Data Analysis Methods:
Specific capacitance was calculated from CV and GCD curves using standard equations; EIS data were fitted with an equivalent circuit to determine resistances and capacitances.
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