Hierarchically 1D CdS decorated on 2D perovskite-type La 2 Ti 2 O 7 nanosheet hybrids with enhanced photocatalytic perfo
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ORIGINAL ARTICLE
Hierarchically 1D CdS decorated on 2D perovskite-type La2Ti2O7 nanosheet hybrids with enhanced photocatalytic performance Liang Mao, Xiao-Yan Cai, Ming-Shan Zhu*
Received: 19 July 2020 / Revised: 2 August 2020 / Accepted: 11 August 2020 Ó GRINM Bohan (Beijing) Publishing Co., Ltd 2020
Abstract In this paper, a heterojunction of hierarchically one-dimensional (1D) cadmium sulfide (CdS) nanowires decorated on the two-dimensional (2D) La2Ti2O7 (LTO) has been fabricated by a simple two-step hydrothermal process. The structure, morphology and surface chemical composition of CdS/LTO were studied by a variety of characterizations, in which the X-ray photoelectron spectroscopy (XPS) results showed a strong interaction between CdS and LTO through S–O bonds. The type II band alignment of CdS/LTO for favorable electron transfer from CdS to LTO and hole transfer from LTO to CdS was clarified by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy and Mott–Schottky (M–S) plot measurements. In the absence of any co-catalyst, H2 production from water splitting and Rhodamine B (RhB) decomposition in aqueous solution were carried out to evaluate the photocatalytic activities, showing that the photocatalytic performance of CdS/LTO was superior to that of pure LTO and CdS under visible light and simulated sunlight. The optimal CdS content in the CdS/LTO system was
L. Mao, X.-Y. Cai School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China L. Mao, X.-Y. Cai Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipment, China University of Mining and Technology, Xuzhou 221116, China M.-S. Zhu* School of Environment, Jinan University, Guangzhou 511443, China e-mail: [email protected]
determined to be 7.5 wt%. The present results show an effective pathway to design a 1D/2D heterojunction photocatalyst in the face of overwhelming problems of energy crisis and environmental pollution. Keywords Cadmium sulfide; Lanthanum titanium oxide; Heterojunction; H2 production; Dyes degradation
1 Introduction Nowadays, the overwhelming problems of energy crisis and environmental pollution call for urgent steps in the development of highly efficient yet low-cost and environmentally friendly energy source [1]. Solar energy, a clean, free and inexhaustible resource, has long been considered as one of the most promising renewable energy sources [2]. In the past five decades, various semiconductors photocatalysts have been developed for the conversion of solar energy to chemical energy in the applications of water splitting, water treatment, solar cells and so on [3]. Generally, the photocatalytic performances of these semiconductor photocatalysts are strong dependent on their morphology [4–6]. This is because of the distinct different surface-to-volume ratio of nanostructure of different morphologies together with the different crystal facets exposed by a nanostructure with anisotropic shape, which bring about variations in
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