277714 Enhancing Photocatalytic Reduction of CO2 by Using Bimetallic Co-Catalyst and Plasmonic Nanoparticles

Monday, October 29, 2012: 9:10 AM
317 (Convention Center )
Bijith Mankidy, Chemical & Biomedical Engineering, University of South Florida, Tampa, FL, Babu Joseph, Chemical and Biomedical Engineering, Clean Energy Research Center, University of South Florida, Tampa, FL and Vinay Gupta, Chemical and Biomedical Engineering, University of South Florida, Tampa, FL

Novel methods to fabricate nanostructured composites have inspired the design and development of new nanocomposites for advanced applications in catalysis, sensors, and medicine. We will demonstrate a colloidal route to synthesize TiO2 based nanocomposites for photocatalytic reduction of carbon dioxide and water to synthetic hydrocarbons. Here, plasmonic Ag@SiO2 core-shell nanoparticles were synthesized to increase the number of electron-hole pair generation. Metal nanoparticles of Ag, Pt and bimetallic Ag-Pt were used as co-catalysts to assist quick transferring of photo-excited charge carriers to the electrolyte. Photocatalytic reduction experiments were carried out in a home-built reactor fitted with two IR transparent windows that allowed direct monitoring of CH4 and CO gaseous product formation during photoreduction of CO2. The nanocomposites were characterized using a combination of several techniques such as dynamic light scattering technique, UV-vis absorption spectroscopy, and transmission electron microscopy.  We find a nearly 10-fold increase in catalytic conversion when both plasmonic and co-catalytic nanoparticles were used synergistically. Synthesis, material characterization, and photo-reduction experimental details will be discussed in the presentation.

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See more of this Session: Nanoscale Materials as Catalysts I
See more of this Group/Topical: Catalysis and Reaction Engineering Division