Xu, Tao (Professor of chemistry)
Ph.D. (Doctor of Philosophy)
Department of Chemistry and Biochemistry
Catalysis; Photoelectrochemistry; Electric batteries; Renewable energy sources; Inorganic chemistry
This dissertation investigates two separate clean energy applications, emphasizing material applications and electrochemistry techniques. The first section examines environmentally friendly alternatives for water purification to avoid carcinogenic by-products. To diminish such possibilities, research has shifted towards photoelectrochemical catalysts, such as titanium dioxide (TiO2), because pure TiO2 has limited absorption in the ultraviolet region. Therefore, Ti3+, a self-dopant, has become an attractive candidate for environmentally friendly alternatives. This dissertation demonstrates a novel oxidation procedure to form self-doped Ti3+ in the bulk of rutile TiO2. A brief overview of the work will be given and supporting data including material, methods, structural characterization, photocatalytic activity, and wastewater applications will be discussed. These results displayed a photoactive shift to the visible-light region due to Ti3+ being present within the bulk of the sample, while utilizing a simple industrialization process.||The second section of this dissertation investigates the clean energy application of fuel cells to decrease fossil fuel dependency. Currently, polymer electrolyte fuel cells (PEMFCs) and alkaline fuel cells (AFCs) are the leading candidates for transportation applications due to their capability of producing a high power density, operating at low temperatures, and achieving sufficient travel range between fuel refills. The oxygen reduction reaction (ORR) at the cathode is the rate-limiting reaction for PEMFCs and AFCs versus the hydrogen oxidation reaction at the anode. Thus, the cathode requires a significantly higher electrocatalyst load of platinum (Pt), which is known to be scarce and costly.||The Department of Energy (DOE) has been actively involved in developing highly active, low-cost non-PGM catalysts using metal-organic frameworks (MOFs) as precursors. The second section of this dissertation examines the impact of ORR catalytic activity by MOF-based precursors with various nitrogen-containing organic ligands. The catalyst synthesis, processing, and performance evaluation in both acidic and alkaline media will be discussed. Ligand effects were investigated within MOF -- based precursors to determine their capability of impacting PEMFC and AFC performance. These findings suggest ligands have the ability to enhance catalytic activity, further the improvements of an ORR active catalyst, and eventually replace costly Pt.
Grabstanowicz, Lauren Rae, "The syntheses, characterizations, and applications of novel photo- and electrochemical catalysts" (2014). Graduate Research Theses & Dissertations. 6331.
Northern Illinois University
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