Effect of layers on the photocatalytic hydrogen evolution in Dion–Jacobson layered-tantalum perovskites. Issue 44 (12th October 2021)

• Record Type: Journal Article
• Authors: Wang, Peng; Chen, Wenqian; Wang, Zihan; Tang, Ya; Shi, Wenyan; Tang, Liang
• Is Part Of: Dalton transactions. Volume 50:Issue 44(2021)
• Page Start: 16076
• Page End: 16083
• Publication Date: 2021-10-12
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt02069b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The photocatalytic activity of KLaTa2 O7 ( n = 2) is the best due to the existence of interlayer cations and the highest conduction band edge potential. Abstract : 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′[A n −1 Ta n O3 n +1 ]) of LaTaO4, KLaTa2 O7, and KCa2 Ta3 O10 with n = 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 KLaTa2 O7 ( n = 2) > KCa2 Ta3 O10 ( n = 3) ≫ LaTaO4 ( n = 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 n = 2 and 3. This work sheds new light on the field of layered perovskites as efficient photocatalysts.