Hu Shengliang, Yang Wenliang, Li Ning, Wang Huiqi, Yang Jinlong, Chang Qing
North University of China, School of Energy and Power Engineering, School of Material Science and Engineering, Taiyuan, 030051, P. R. China.
State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, P. R. China.
Small. 2018 Nov;14(44):e1803447. doi: 10.1002/smll.201803447. Epub 2018 Oct 4.
A photocatalytic reaction is always governed by energy band configuration of the catalyst, but its modulation is challenging. Here, the adjustment of band-edge positions of Ag PO through fluorescent carbon dots is reported for the first time. Both Ag PO and carbon dots which keep the similar sizes constitute a heterojunction. Such heterostructure not only promotes visible light absorption, photogenerated charge separation, and transfer, but it also transforms photocatalytic activity of Ag PO from photooxidation to photoreduction due to the huge changes of band-edge positions. In addition, the heterojunction structure of carbon dots and Ag PO exhibits unique temperature-responsive photocatalytic activities and higher photocatalytic stability than the pure Ag PO . According to the contrast experiments and related characterizations, the possible mechanism of photocatalytic reaction is proposed. Therefore, this work offers an alternative route for adjusting energy band positions or tuning photocatalytic performance as well as for preparing novel carbon-dot-based heterostructure.
光催化反应总是受催化剂的能带结构支配，但其调控具有挑战性。在此，首次报道了通过荧光碳点对Ag₃PO₄的带边位置进行调节。尺寸相近的Ag₃PO₄和碳点构成了一个异质结。这种异质结构不仅促进了可见光吸收、光生电荷分离和转移，而且由于带边位置的巨大变化，还将Ag₃PO₄的光催化活性从光氧化转变为光还原。此外，碳点与Ag₃PO₄的异质结结构表现出独特的温度响应光催化活性，且比纯Ag₃PO₄具有更高的光催化稳定性。根据对比实验和相关表征，提出了光催化反应的可能机理。因此，这项工作为调整能带位置或调节光催化性能以及制备新型碳点基异质结构提供了一条替代途径。
