Wu Boyuan, Sun Tiankai, Liu Ning, Lu Lele, Zhang Ruizhe, Shi Wei, Cheng Peng
Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE) and Renewable Energy Conversion and Storage Centre (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China.
Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China.
ACS Appl Mater Interfaces. 2022 Jun 15;14(23):26742-26751. doi: 10.1021/acsami.2c04729. Epub 2022 May 31.
Fabricating heterojunction photocatalysts for H production is promising for the development of clean energy. For boosting the photocatalytic activity, modulating the heterojunction interface can facilitate the electron-hole separation and solar energy utilization, but it is highly challenging in synthesis. In this work, by facilely exfoliating the bulk CN, ultrathin CN nanosheets (N-CN) with large surface area, improved light absorption, and efficient charge transport were synthesized and further applied to the construction of NH-UiO-66/N-CN heterojunctions. The optimized NH-UiO-66/N-CN-2 exhibits high hydrogen evolution rate and cycling stability with Pt as the cocatalyst. Combined with the experimental results, the density functional theory calculation reveals that the high photocatalytic performance is attributed to the promoted photogenerated carrier transfer by the formation of well-contacted and stable Z-scheme heterojunction interface. This contribution renders an insight into the modulation of the heterojunction interface for enhancing the activity of MOF-based photocatalysts.
制备用于制氢的异质结光催化剂对清洁能源的发展具有重要意义。为了提高光催化活性，调控异质结界面可以促进电子-空穴分离和太阳能利用，但在合成过程中极具挑战性。在这项工作中，通过简单地剥离块状CN，合成了具有大表面积、改善的光吸收和高效电荷传输的超薄CN纳米片（N-CN），并进一步将其应用于构建NH-UiO-66/N-CN异质结。以Pt作为助催化剂，优化后的NH-UiO-66/N-CN-2表现出高的析氢速率和循环稳定性。结合实验结果，密度泛函理论计算表明，高光催化性能归因于通过形成良好接触且稳定的Z型异质结界面促进了光生载流子的转移。这一贡献为调控异质结界面以增强基于MOF的光催化剂的活性提供了见解。
