Oxygen vacancy was considered to act as electron scavengers, delaying electron-hole pair recombination for their critical impacts on the electronic-band structural modulation and optical absorption of a semiconductor. However, the generation and stabilization of oxygen vacancies (V_o) remains a considerable challenge. Herein, a N-doped carbon dots/V_o-rich TiO₂ nanowire array (NCDs/TiO₂ NA-V_o) photoelectrode with a stable oxygen vacancy layer in TiO₂ energy band was constructed successfully by doping with NCDs. This optimized NCDs/TiO₂ NA-V_o photoelectrode exhibited high activity and durability with a degradation reaction constant that was ∼ two and three fold higher than that of TiO₂ NA-V_o and TiO₂ NA electrodes, respectively, and maintained a high degradation efficiency after eight consecutive degradation cycles. Moreover, the NCDs/TiO₂ NA-V_o photoelectrode demonstrated a photocurrent density of 0.56 mA cm⁻², which was more than three times that of TiO₂ NA electrode. These excellent visible light-driven photoelectrocatalysis (PEC) activities could be attributed to the stabilized and regulated oxygen vacancy layer induced by NCDs, which further accelerated the interfacial charge separation to generate more free radicals (e.g., OH, O₂⁻, and ¹O₂) confirmed by electron-spin resonance (ESR) and Photoluminescence Spectra (PL). Our work provides an effective strategy to regulate the defected TiO₂ electrodes in the applications of visible light-driven wastewater treatment.

氧空位被认为是电子清除剂，由于其对半导体的电子带结构调制和光吸收的关键影响而延迟了电子-空穴对的重组。然而，氧空位（V _o）的产生和稳定仍然是相当大的挑战。在此，N型掺杂碳的点/ V _ö富含的TiO ₂纳米线阵列（非传染性疾病/的TiO ₂ NA-V _ø与以TiO稳定氧空位层）光电极₂能带已经成功地由慢性非传染性疾病掺杂构成。经过优化的NCD / TiO ₂ NA-V _o光电极表现出高的活性和耐久性，这是〜两个和三个比的TiO倍高的降解反应常数₂ NA-V _ö和TiO ₂ NA电极，分别与保持八个连续降解次循环后的高降解效率。此外，NCDs / TiO ₂ NA-V _o光电极的光电流密度为0.56 mA cm ^-2，是TiO _2的三倍以上。NA电极。这些优异的可见光光驱动光电催化（PEC）的活动可以归因于由非传染性疾病，这进一步加速了界面电荷分离，以产生更多的自由基（引发的稳定和调节的氧空位层例如，OH，O- ₂ ^- ，和¹ ö ₂）由电子自旋共振（ESR）和光致发光光谱（PL）确认。我们的工作为在可见光驱动的废水处理应用中调节有缺陷的TiO ₂电极提供了有效的策略。