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In-situ stabilizing surface oxygen vacancies of TiO2 nanowire array photoelectrode by N-doped carbon dots for enhanced photoelectrocatalytic activities under visible light
Journal of Catalysis ( IF 6.5 ) Pub Date : 2020-01-09 , DOI: 10.1016/j.jcat.2019.12.030
Shanpeng Li , Chunlei Liu , Ping Chen , Wenying Lv , Guoguang Liu

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 (Vo) remains a considerable challenge. Herein, a N-doped carbon dots/Vo-rich TiO2 nanowire array (NCDs/TiO2 NA-Vo) photoelectrode with a stable oxygen vacancy layer in TiO2 energy band was constructed successfully by doping with NCDs. This optimized NCDs/TiO2 NA-Vo photoelectrode exhibited high activity and durability with a degradation reaction constant that was ∼ two and three fold higher than that of TiO2 NA-Vo and TiO2 NA electrodes, respectively, and maintained a high degradation efficiency after eight consecutive degradation cycles. Moreover, the NCDs/TiO2 NA-Vo 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.



中文翻译:

N掺杂碳点原位稳定TiO 2纳米线阵列光电极的表面氧空位,提高可见光下的光电催化活性

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。

更新日期:2020-01-11
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