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In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
Published on: January 17, 2017
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Plasmon-Enhanced Photocurrent using Gold Nanoparticles on a Three-Dimensional TiO2 Nanowire-Web Electrode
Yin-Cheng Yen1, Jau-An Chen1, Sheng Ou1
1Department of Chemistry, National Chung Hsing University, Taichung 40227, Taiwan, Republic of China.
Scientific Reports
|February 11, 2017
Summary
This study synthesized gold nanoparticle-decorated mixed-phase titanium dioxide hierarchical networks (Au/TiO2 ARHN) for enhanced photo-electrochemical (PEC) performance. The novel material demonstrated a significant 4.5-fold increase in photocurrent for PEC water splitting applications.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Titanium dioxide (TiO2) is a key material in photocatalysis.
- Improving light harvesting and charge carrier dynamics is crucial for enhancing TiO2 performance in photo-electrochemical (PEC) cells.
- Mixed-phase TiO2 and noble metal nanoparticle decoration are strategies to boost photocatalytic activity.
Purpose of the Study:
- To synthesize a novel anatase/rutile mixed-phase titanium dioxide hierarchical network decorated with gold nanoparticles (Au/TiO2 ARHN).
- To investigate the structural and photo-electrochemical properties of the synthesized Au/TiO2 ARHN.
- To elucidate the mechanism behind the enhanced photocurrent in PEC water splitting.
Main Methods:
- Facile hydrothermal synthesis followed by calcination to create the Au/TiO2 ARHN.
- Electrochemical measurements using a three-electrode system in 1 M NaOH electrolyte.
- Solar illumination under AM1.5G conditions to evaluate PEC performance.
Main Results:
- Successful synthesis of anatase/rutile mixed-phase TiO2 hierarchical network with deposited Au nanoparticles.
- Au/TiO2 ARHN exhibited a remarkable 4.5-fold enhancement in photocurrent compared to pure TiO2 nanowires.
- The enhanced performance is attributed to improved light harvest and charge transport/separation.
Conclusions:
- The synthesized Au/TiO2 ARHN shows significant potential for applications in PEC water splitting.
- The hierarchical mixed-phase structure with Au nanoparticles effectively enhances photo-electrochemical efficiency.
- A proposed mechanism explains the superior photocurrent generation in the developed material.
