Two‐photon Absorption in a Defect‐engineered Carbon Nitride Polymer Drives Red‐light Photocatalysis,ChemCatChem

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Two‐photon Absorption in a Defect‐engineered Carbon Nitride Polymer Drives Red‐light Photocatalysis
ChemCatChem ( IF 3.8 ) Pub Date : 2020-05-12 , DOI: 10.1002/cctc.202000803
Peng Wang ₁ , Lin Tian ₁ , Xinhua Gao ₂ , Yan Xu ₁ , Pengju Yang ₃

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Exploiting photocatalysts that harvest the solar spectrum as broadly as possible remains a high‐priority target, but is a grand challenge. Herein, for the first time, we found that bulky polymer carbon nitride (denoted as PCN) possessed excellent two‐photon absorption behavior and confirmed that the bulky PCN can efficiently drive red‐light photocatalysis by two‐photon absorption processes. Long‐wavelength‐excited fluorescence measurements and confocal laser scanning microscopy clearly revealed the existence of two‐photon absorption in PCN. Moreover, we created nitrogen vacancies on the PCN surface by increasing the polymerization temperature and confirmed the nitrogen vacancies can efficiency accelerate charge separation. As a result, bulky PCN with nitrogen vacancies showed unexpected pollutant degradation and water splitting activity under 660 nm. Additionally, PCN obtained from other precursors also exhibited competent red‐light photocatalytic performance. This work represents an important step toward developing two‐photon‐absorption PCN photocatalysts for wide solar‐spectrum utilization.

中文翻译：

缺陷工程氮化碳聚合物中的双光子吸收驱动红色光催化作用

开发尽可能广泛地收集太阳光谱的光催化剂仍然是一个高度优先的目标，但这是一个巨大的挑战。在这里，我们首次发现大体积的聚合物碳氮化物（表示为PCN）具有出色的双光子吸收行为，并证实了大体积的PCN可以通过双光子吸收过程有效地驱动红光光催化。长波长激发荧光测量和共聚焦激光扫描显微镜清楚地揭示了PCN中存在双光子吸收。此外，我们通过提高聚合温度在PCN表面上创建了氮空位，并确认了氮空位可以有效地加速电荷分离。结果是，具有氮空位的大体积PCN在660 nm下显示出意外的污染物降解和水分解活性。此外，从其他前体获得的PCN还表现出出色的红光光催化性能。这项工作代表了开发可广泛吸收太阳光谱的两光子吸收PCN光催化剂的重要一步。

更新日期：2020-05-12

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