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Issue 4, 2018
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Influence of dimensionality and crystallization on visible-light hydrogen production of Au@TiO2 core–shell photocatalysts based on localized surface plasmon resonance

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Abstract

Localized surface plasmon resonance (LSPR) of Au nanostructures has been applied to enhance the visible absorption and efficiency of TiO2. However, to date, most reports on photocatalysts based on Au LSPR properties have mainly focused on zero dimensional (0D) Au nanoparticles. Herein, we investigated the effect of the dimensionality of Au and the crystallinity of TiO2 in Au@TiO2 core–shell photocatalysts on visible-light H2 production. We prepared Au@TiO2 core–shell nanostructures with four different dimensionalities of Au, nanoparticles (NPs, 0D), nanorods [one dimensional (1D)], nanoprisms [two dimensional (2D)] and nanostars [three dimensional (3D)]; meanwhile we used a hydrothermal treatment method to crystallize amorphous TiO2 instead of the widely used annealing at high temperatures. The results indicate that both higher dimensionality and anisotropy of the Au core and good crystallinity of the TiO2 shell significantly enhance the visible-light catalytic activity towards H2 generation. Among these four Au@TiO2 nanostructures, Au nanostars wrapped with crystalline TiO2 show the best catalytic activity with a H2 generation rate of 76.6 μmol g−1 h−1. The analysis of these Au@TiO2 nanostructures via the finite-difference time-domain (FDTD) method indicates that both high dimensionality of Au and high crystallinity of TiO2 can lead to large electromagnetic (EM) field enhancements, which ensures an increased population of hot electrons close to the interface between the Au and the TiO2. This work may provide a facile strategy to improve the catalytic activity of visible-light plasmonic photocatalysts.

Graphical abstract: Influence of dimensionality and crystallization on visible-light hydrogen production of Au@TiO2 core–shell photocatalysts based on localized surface plasmon resonance

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Publication details

The article was received on 12 Oct 2017, accepted on 07 Jan 2018 and first published on 09 Jan 2018


Article type: Paper
DOI: 10.1039/C7CY02083J
Citation: Catal. Sci. Technol., 2018,8, 1094-1103
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    Influence of dimensionality and crystallization on visible-light hydrogen production of Au@TiO2 core–shell photocatalysts based on localized surface plasmon resonance

    B. Liu, Y. Jiang, Y. Wang, S. Shang, Y. Ni, N. Zhang, M. Cao and C. Hu, Catal. Sci. Technol., 2018, 8, 1094
    DOI: 10.1039/C7CY02083J

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