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Influence of dimension and crystallization on visible-light hydrogen production of Au@TiO2 core-shell photocatalysts based on localized surface plasmon resonance

Abstract

Localized surface plasmon resonance (LSPR) of Au nanostructures has been applied to enhance visible absorption and efficiency of TiO2. However, till today, most of photocatalysts based on Au LSPR properties mainly focus on zero dimensional (0D) Au nanoparticles. Herein, we investigated the effect of the dimension of Au and the crystallization of TiO2 in Au@TiO2 core-shell photocatalysts on visible-light H2 production. We prepared Au@TiO2 core-shell nanostructures with four different dimensions of Au, nanoparticles (NPs, 0D), nanorods [one dimensional (1D)], nanoprisms [two dimensional (2D)] and nanostars [three dimensional (3D)] and meanwhile we used hydrothermal treatment method to crystallize amorphous TiO2 instead of widely used annealing at high temperature. The results indicate that higher-dimensional anisotropy of the Au core and good crystallization of the TiO2 shell both significantly enhance the visible-light catalytic activity towards H2 generation. Among these four Au@TiO2 nanostructures, Au nanostars wrapped with crystalline TiO2 shows the best catalytic activity with H2 generation rate of 76.6 μmol g−1 h−1. The analysis on these Au@TiO2 nanostructures via finite-difference time-domain (FDTD) method indicates that high dimension of Au and high crystallinity of TiO2 both 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 of the catalytic activity of the visible-light plasmonic photocatalysts.

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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, Accepted Manuscript
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    Influence of dimension 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, Accepted Manuscript , DOI: 10.1039/C7CY02083J

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