Preparation of Nano-Ag-TiO2 Composites by Co-60 Gamma Irradiation to Enhance the Photocurrent of Dye-Sensitized Solar Cells

Author:

Huynh Le Thanh Nguyen12ORCID,Le Viet Hai3,Vo Thanh Long1,Nguyen Thi Kim Lan4,Nguyen Quoc Hien4ORCID,Nguyen Thai Hoang12ORCID

Affiliation:

1. Department of Physical Chemistry, Faculty of Chemistry, VNUHCM-University of Science, Ho Chi Minh City, Vietnam

2. Applied Physical Chemistry Laboratory, VNUHCM-University of Science, Ho Chi Minh City, Vietnam

3. Faculty of Materials Science and Technology, VNUHCM-University of Science, Ho Chi Minh City, Vietnam

4. Research and Development Center for Radiation Technology, Vietnam Atomic Energy Institute (VAEI), Ho Chi Minh City, Vietnam

Abstract

Nano-silver-titanium dioxide (Ag-TiO2) composites were prepared from commercial TiO2 (P25, Degussa) and silver nitrate (AgNO3) by gamma Co-60 irradiation method with various initial concentrations of AgNO3. The nano-AgTiO2 composites are utilized as the photoanode for dye-sensitized solar cells (DSCs). Under full sunlight illumination (1000 W/m2, AM 1.5), the efficiency of DSCs has improved significantly despite the Ag content of below 1%. The DSC—assembled with 0.75 Ag-TiO2 (0.75% Ag) photoanode—showed that the photocurrent was significantly enhanced from 8.1 mA.cm−2 to 9.5 mA.cm−2 compared to the DSCs using bared TiO2 photoanode. The unchanged open-circuit voltage resulted in the overall energy conversion efficiency to be increased by 25% from 3.75% to 4.86%. Electrochemical impedance spectroscopy (EIS) analysis showed that the charge transfer resistance is reduced when increasing Ag content, demonstrating that the charge transfer at TiO2/dye interface was enhanced in the presence of silver nanoparticles.

Funder

Vietnam National University Ho Chi Minh City

Publisher

Hindawi Limited

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment,Atomic and Molecular Physics, and Optics,General Chemistry

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