4.7 Article

The construction of 3D hierarchical CdS/NiAl-LDH photocatalyst for efficient hydrogen evolution

期刊

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 48, 期 6, 页码 2200-2210

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.10.099

关键词

CdS; NiAl-LDH; 3D hierarchical; Photocatalytic H2 evolution; Heterojunction

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A novel 3D hierarchical CdS/NiAl-LDH photocatalyst consisting of 1D CdS nanorods and 3D flower-like NiAl-LDH microspheres was successfully fabricated by an electrostatic assembly strategy. The CNA-20 hierarchical photocatalyst exhibited the optimum hydrogen evolution rate of 3.24 mmol g-1 h-1 under visible irradiation, which was 6.23 times higher than that of pure CdS. A type-II charge transfer mechanism was proposed based on energy band structures and first-principles calculation. The designed synergistic 1D/3D interface interaction effectively promoted the rapid separation and migration of photogenerated charges, thus facilitating H2 evolution.
The development of excellent photocatalysts for hydrogen evolution is of great significance to solving the global energy crisis. In this work, a novel 3D hierarchical CdS/NiAl-LDH photocatalyst was fabricated by a facile electrostatic assembly strategy, which was composed of 1D CdS nanorods and 3D flower-like NiAl-LDH microspheres. Under the visible irradiation, the CNA-20 hierarchical photocatalyst presents the optimum hydrogen evolution rate achieved to 3.24 mmol g-1 h-1, which is improved 6.23-fold in comparison with the pure CdS. Through the analysis of energy band structures and first-principles calculation, the type-II charge transfer mechanism was proposed. Driven by the built-in electric field, as well as the effect of intimate interface contact of CdS and NiAl-LDH, the photogenerated charge could be achieved rapidly separate and migrate, which effectively promotes the H2 evolution. This well-designed synergistic 1D/3D interface interaction and provides an economic approach to rationally developing metal-free photocatalysts for hydrogen production. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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