Wang Peng, Chen Wenqian, Wang Zihan, Tang Ya, Shi Wenyan, Tang Liang
Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai 200444, PR China.
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China.
Dalton Trans. 2021 Nov 16;50(44):16076-16083. doi: 10.1039/d1dt02069b.
Tantalum-based layered perovskites have always been an interesting topic in photocatalysis, but limited information has been reported in terms of their layer factor. In this work, we have synthesized Dion-Jacobson layered perovskites (A'[ATaO]) of LaTaO, KLaTaO, and KCaTaO with = 1, 2, and 3, respectively. With the modification of 1 wt% Pt co-catalysts, the photocatalytic analysis showed that the performance order of these layered perovskites with different layers is KLaTaO ( = 2) > KCaTaO ( = 3) ≫ LaTaO ( = 1) with both methanol and NaI as the sacrificial agents. This suggested the importance of interlayer K for high photocatalytic performance. We further analyzed the layered perovskites in detail by BET, photoelectrochemical analysis, Mott-Schottky, and VB-XPS test. The combined results indicated that the positions of the conduction band are the dominant factors for the photocatalytic performance of tantalum-based Dion-Jacobson layered perovskites with = 2 and 3. This work sheds new light on the field of layered perovskites as efficient photocatalysts.
