Solar Energy Conversion using Hybrid Photocatalysts

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Presentation transcript:

Solar Energy Conversion using Hybrid Photocatalysts where Molecular Catalysis meets Surface Chemistry and Materials Science The Group, Department of Chemistry & Materials Science Program University of New Hampshire, Durham, NH 03824 Motivation: Solar Fuel Generation via CO2 Reduction Solar energy is the most abundant renewable energy source available, yet we still lack efficient and robust devices for solar energy conversion; Carbon dioxide is a renewable C1 feedstock for the production of chemicals, materials, and fuels; Molecular catalysts based on metal-ligand complexes are highly efficient in mediating multi-electron CO2 reduction (CO2 + 2e- + 2H+  CO + H2O); Combining molecular catalysts with nanostructured surfaces improves catalyst stability, enhances reactivity & enables novel reaction pathways. Our Approach: Bridging Molecular Catalysis with Surface Chemistry Homogeneous Molecular Catalysts Heterogeneous Surface Catalysts Project #1: Heterogenization of Molecular Catalysts Project #3: Exploring Highly Active Catalytic Sites in Metal/TiO2 Nanocomposites CO-Cu+ Cu e- e- hv hv e- h+ h+ TiO2 TiO2 Highly active, tunable Molecular understanding Poor stability/recyclability Very stable, recyclable Inexpensive, easy to prepare Lack of molecular understanding Surface metal sites inhibit charge recombination (dotted line) and serve as hotspots for CO2 reduction IR spectra of CO adsorbed on two Cu/TiO2 photocatalysts Project #4: Environmental Photocatalysis Dye Degradation Molecular Catalyst Time hv Light Absorbing Linkage SiO2 TiO2 Collaborators Dr. Richard Johnson, UNH Dr. Dunwei Wang, Boston College Dr. N. Aaron Deskins, WPI Dr. Jay Agarwal, Univ. of Georgia Dr. Etsuko Fujita, Brookhaven Dr. Tijana Rajh, Argonne Project #2: Coupling Catalysts with Energy Sources Electron Sink Li Lab Instruments Transmission FTIR Spectrometer DRIFTS Spectrometer UV-Vis Spectrophotometer Electrochemical Station BET Surface Area Analyzer Gas Chromatograph CO2 CO e- h+ hv D+ D Photocatalysis Outreach Activities: Solar Energy Workshops for High School Teachers e- hv Conditions: TEOA/MeOH UV light D h+ D+ Photoelectrochemical CO2 Reduction Funding NSF CAREER Award (#CHE-1352437) 2014-2019 NSF #CBET-1510810 2015-2018 Contact Information Gonghu Li, Associate Professor Department of Chemistry & Materials Science Program Phone: 603-862-0607 Email: gonghu.li@unh.edu Silicon Nanowires (courtesy of Dr. Dunwei Wang)