Erratic charge transfer dynamics of Au/ZnTiO3 nanocomposites under UV and visible light irradiation and their related photocatalytic activities

Nanoscale
K Hemalata ReddyKulamani Parida

Abstract

The present article presents an in-depth discussion on the state-of-the-art multifarious roles of Au nanoparticles and their associated charge anti-recombination process in burgeoning photocatalysis research. Hexagonal-phase ZnTiO3 was fabricated through a sol-gel auto-combustion method by optimizing the calcination temperatures. To further improve the charge separation efficiency and visible light induced photocatalytic activity of pristine ZnTiO3, we designed a new type of Au/ZnTiO3 nanocomposite by a precipitation-deposition method. The photocatalytic activities of the Au/ZnTiO3 nanocomposites were substantiated by evaluating the rate of hydrogen evolution under both UV and visible light illumination. The photocatalytic activity of the Au/ZnTiO3 nanocomposites rises proportionally with an increase in Au content up to 1.5 wt% under UV light illumination and it produce around 285 μmol h-1 of H2 which is approximately 2.6 times higher than that produced by pristine ZnTiO3. Therefore, the Au nanoparticles present on the surface of ZnTiO3 act as electron acceptors, leading to an increase in the rate of generation and separation of charge carriers. This process helps to enhance the congregation of electrons on Au nanoparticles thr...Continue Reading

References

Apr 4, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Xiao-Feng WuYun-Fa Chen
Jul 15, 2009·Journal of Hazardous Materials·Ji-Zhou KongDi Wu
Jun 19, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Manca LogarDanilo Suvorov
Oct 28, 2011·ACS Applied Materials & Interfaces·Nayane UdawatteDongil Lee
Jan 17, 2013·ACS Applied Materials & Interfaces·Jiye ZhangJiaguo Yu
Nov 30, 2013·Physical Chemistry Chemical Physics : PCCP·Jingxiang LowBei Cheng

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Methods Mentioned

BETA
surface plasmon resonance
X-ray
scanning
transmission electron microscopy

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