Poster Title

The Visible-light Responsive TiO2/Graphene Heterojunction Materials

Grade Level at Time of Presentation

Sophomore

Institution

Western Kentucky University

KY House District #

59

KY Senate District #

26

Department

department of chemistry

Abstract

The Visible-light Responsive TiO2/Graphene Heterojunction Materials

Logan Parker, Ying Chen, Hongyan Gao, Yan Cao*

Institute for Combustion Science and Environmental Technology, Department of Chemistry, Western Kentucky University, Bowling Green, KY 42101

Titanium dioxide is a known photocatalyst, but can only be responsive to the UV light spectrum of the sun’s emitted light. Previous research has shown that combining graphene with titanium dioxide highly enhances the photocatalytic ability of the Dye Sensitized Solar Cell (DSSC) by allowing the solar cell to access the visible light spectrum, which is majority of the sun’s emitted light. This project studied the effects of the size of the titanium dioxide nanoparticle on the photocatalytic ability of the solar cell, assuming that smaller titanium dioxide nanoparticles would have greater contact with graphene sheets, which would create a higher photocatalytic ability. Through a modified hydrothermal method (Chae et. al., 2003), titanium dioxide was synthesized with varying sizes, this was followed to be combined with reduced graphene sheets using a modified hydrothermal method. To determine the photo-responsibility of obtained composite materials, we used the photodegradation tests of rhodamine B to demonstrate their effectiveness. It was found that the smaller the size of the titanium dioxide nanoparticle, the greater the degradation of rhodamine B, which validated the project hypothesis.

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The Visible-light Responsive TiO2/Graphene Heterojunction Materials

The Visible-light Responsive TiO2/Graphene Heterojunction Materials

Logan Parker, Ying Chen, Hongyan Gao, Yan Cao*

Institute for Combustion Science and Environmental Technology, Department of Chemistry, Western Kentucky University, Bowling Green, KY 42101

Titanium dioxide is a known photocatalyst, but can only be responsive to the UV light spectrum of the sun’s emitted light. Previous research has shown that combining graphene with titanium dioxide highly enhances the photocatalytic ability of the Dye Sensitized Solar Cell (DSSC) by allowing the solar cell to access the visible light spectrum, which is majority of the sun’s emitted light. This project studied the effects of the size of the titanium dioxide nanoparticle on the photocatalytic ability of the solar cell, assuming that smaller titanium dioxide nanoparticles would have greater contact with graphene sheets, which would create a higher photocatalytic ability. Through a modified hydrothermal method (Chae et. al., 2003), titanium dioxide was synthesized with varying sizes, this was followed to be combined with reduced graphene sheets using a modified hydrothermal method. To determine the photo-responsibility of obtained composite materials, we used the photodegradation tests of rhodamine B to demonstrate their effectiveness. It was found that the smaller the size of the titanium dioxide nanoparticle, the greater the degradation of rhodamine B, which validated the project hypothesis.