Abstract
Ag-decorated TiO2 nanowire arrays were facilely prepared by H2O2 corrosion of Ti and subsequent photodeposition of Ag. Array structures and photoelectric properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis absorption spectroscopy and electrochemical methods. These results show that Ag quantum dots are evenly distributed on the surface of TiO2 nanowires. With an Ag content of 0.4 at%, the electrode's photocurrent density and photoconversion efficiency obtained optimum values of 0.29 mA/cm2 and 8.55%, respectively. The enhanced photoelectrochemical properties with Ag modification can be attributed to the extended visible light absorption range and improved separation of photo-generated carriers. Additionally, the modified nanowire arrays exhibited much stronger photoelectrocatalytic reduction activity toward hydrogen peroxide in comparison with pure TiO2 arrays or previously reported Ag electrodes.
Original language | English (US) |
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Pages (from-to) | 111-115 |
Number of pages | 5 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 211 |
DOIs | |
State | Published - May 2015 |
Keywords
- Photodeposition
- Photoelectrochemical property
- Silver
- TiO NW arrays
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry