| Abstract |
| In this study, a novel single-electrode system integrating a WO₃ photoanode and a CNTs cathode on an FTO substrate (WO₃/FTO/CNTs) was developed to maximize electrode surface utilization. Structural analysis revealed that the synthesized WO₃ possessed a particle size of approximately 40-80 nm with a total thickness of 1.45 μm, while the CNTs exhibited diameters of 50-60 nm with an electrode thickness ranging from 2 to 15 μm. The performance of this integrated system was rigorously evaluated under various electrochemical (EC) and photoelectrochemical (PEC) conditions, with a specific focus on the impact of external oxygen (O₂) injection. Under dark conditions (EC), both the generation of reactive oxygen species (ROS) and phenol degradation efficiency were found to be negligible. Although the introduction of oxygen (EC + O₂) increased H2O₂ production to 2.19 μmol, the phenol degradation rate remained insufficient at 16%. In contrast, the PEC process significantly enhanced the degradation efficiency to 67% by facilitating the photocatalytic conversion of H2O₂ into highly reactive hydroxyl radicals (·OH) under light irradiation. The PEC + O₂ process demonstrated the superior performance, yielding 2.52 μmol of H2O₂ and achieving degradation rates of 55% for p-CBA and 88% for phenol. This enhanced efficiency is attributed to the synergistic effect of photostimulation and a continuous oxygen supply, which collectively maximized radical generation for effective pollutant degradation. |
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| Key Words |
| 탄소나노튜브, 페놀 분해, 활성산소종, 단일전극, WO₃, Carbon Nonotube, Phenol Degradation, Reactive Oxygen Species, Single Electrode |
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