Quantum Dot Photoelectrocatalysis
Hani Sobhi, Sam Tanabe
Department of Chemistry & Biochemistry
Faculty Supervisor: Micheal Enright
Quantum dot photocatalysis has been extensively studied for its ability to drive energy-conversion reactions, including hydrogen evolution and lignin biomass conversion for renewable fuel production. However, its efficiency is limited by high electron–hole recombination rates and poor photocatalyst stability. A promising strategy to address these challenges is the integration of quantum dots into photoelectrochemical (PEC) systems, where an applied electrical bias promotes charge separation and enhances interfacial charge transfer. Compared to conventional photocatalysis employing sacrificial donors, PEC systems can reduce recombination losses and improve overall catalytic efficiency. Furthermore, photoelectrode stability may be enhanced in PEC configurations by mitigating photocorrosion from reactive electrolytic species. To determine the feasibility of quantum dot-based photoelectrocatalysis, cadmium selenide (CdSe) quantum dots underwent terephthalic acid ligand exchange and were deposited onto conductive substrates, including carbon paper and indium-doped tin oxide (ITO), via drop-casting and spin-coating techniques. Successful ligand exchange was confirmed using UV–Vis spectroscopy and nuclear magnetic resonance (NMR). These findings establish a foundation for incorporating CdSe quantum dots into PEC systems for improved renewable fuel generation.