Zheng Yanmei, Luo Yi, Ruan Qiushi, Yu Jin, Guo Xinli, Zhang Weijie, Xie Hang, Zhang Zheng, Zhao Jianjie, Huang Ying
Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.
Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.
J Colloid Interface Sci. 2022 Mar;609:75-85. doi: 10.1016/j.jcis.2021.12.006. Epub 2021 Dec 2.
Graphitic carbon nitride (CN) is a promising photocatalyst for sustainable energy conversion. Meanwhile, N vacancies are useful for HO generation; however, they are hard to control. In this study, the N vacancy CN sphere (NVCNS) is synthesized by H plasma treatment to tune the NV. The as-synthesized NVCNS exhibits an efficient and stable photocatalytic HO yield of 4413.1 μmol gh, which is 2.5 and 4.6 times higher than that of CNS (1766.4 μmol gh) and bulk CN (956.6 μmol gh), respectively, using a Xe lamp with an intensity of 100 mWcm. In particular, the charges recombination rate is remarkably reduced by introducing N defect state, promoting electron accumulation and O adsorption, through theoretical calculation and experiments. Furthermore, the NV creates abundant unsaturated sites and induces strong interlayer interactions, leading to effective electronic excitation and the promotion of charge transport.
石墨相氮化碳（CN）是一种用于可持续能源转换的很有前景的光催化剂。同时，氮空位有助于羟基生成；然而，它们很难控制。在本研究中，通过氢等离子体处理合成了氮空位CN球（NVCNS）以调节氮空位。所合成的NVCNS表现出高效且稳定的光催化羟基产率，为4413.1 μmol g⁻¹ h⁻¹，使用强度为100 mW cm⁻²的氙灯时，分别是CNS（1766.4 μmol g⁻¹ h⁻¹）和块状CN（956.6 μmol g⁻¹ h⁻¹）的2.5倍和4.6倍。特别是，通过理论计算和实验表明，引入氮缺陷态可显著降低电荷复合率，促进电子积累和氧吸附。此外，氮空位产生了大量不饱和位点并诱导了强烈的层间相互作用，从而导致有效的电子激发并促进电荷传输。
