Portland State University. Department of Chemistry
Date of Award
Master of Science (M.S.) in Chemistry
1 online resource (vii, 52 pages)
Tellurium, Catalysis, Hydrogen peroxide -- Synthesis, Photoelectrochemistry
Growing concerns over climate change and demand for energy worldwide have made development and implementation of alternative energy sources more necessary than ever. Many of the leading energy alternatives suffer from inconsistent energy production due to fluctuations in availability of natural resources, and the current methods of addressing the issue have tremendous ecological and social ramifications of their own. While fuels like hydrogen gas are providing some promise of relief, the scope of infrastructure changes necessary for implementation and the implicit hazards of the use of such fuels complicate their application as an immediate solution. However, hydrogen peroxide carries far fewer direct hazards than hydrogen gas, while producing comparable output. Additionally, since it exists as a liquid at room temperature and atmospheric pressure its potential application with existing infrastructure is far more attainable. While already in use in certain rocket technologies, peroxide fuel cells are still periphery energy production technology mainly due to the relatively high cost of producing hydrogen peroxide. In order for peroxide fuel cells to enter the mainstream and fulfill their potential as an alternative energy source, better and more efficient catalytic methods must be found for synthesis of hydrogen peroxide.
A class of chromophores known as tellurorhodamines have shown promise of providing an alternative approach to production of hydrogen peroxide. Specifically, 3,6-diamino-9-mesityl-telluroxanthylium, in a class of chromophores known as tellurorhodamines, has been shown to produce hydrogen peroxide by photocatalysis. This work describes the combination of properties that make tellurorhodamines viable for photochemical catalytic production of hydrogen peroxide as well as in-operando production of a working current via electrochemical reduction of the catalyst within the same system, effectively creating a photoelectrochemical cathode. The amalgamation of photocatalytic and electrochemical methods in the simultaneous production and storage of energy is extremely desirable, though unprecedented, in the field of alternative energy. In that way, tellurorhodamines present a unique opportunity among existing photoelectrochemical systems, which if applied could represent a new approach to addressing the looming energy crisis.
Lohman, James Eliott, "Photoelectrochemical Catalysis of Hydrogen Peroxide with Tellurium Containing Chromophores" (2019). Dissertations and Theses. Paper 5307.
Available for download on Friday, June 05, 2020