Dissertation/Thesis Abstract

Photoelectrochemical Catalysis of Hydrogen Peroxide with Tellurium Containing Chromophores
by Lohman, James Eliott, M.S., Portland State University, 2019, 62; 13812446
Abstract (Summary)

Growing concerns over climate change and demand for energy world-wide have made development and implementation of alternative energy sources more necessary than ever. Many of the leading energy alternatives suffer from in-consistent energy production due to fluctuations in availability of natural re-sources, and the current methods of addressing the issue have tremendous ecolog-ical 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. Ad-ditionally, 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 cat-alytic 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 tellu-rorhodamines viable for photochemical catalytic production of hydrogen peroxide as well as in-operando production of a working current via electrochemical reduc-tion of the catalyst within the same system, effectively creating a photoelectro-chemical cathode. The amalgamation of photocatalytic and electrochemical meth-ods in the simultaneous production and storage of energy is extremely desirable, though unprecedented, in the field of alternative energy. In that way, tellu-rorhodamnies present a unique opportunity among existing photoelectrochemical systems, which if applied could represent a new approach to addressing the loom-ing energy crisis.

Indexing (document details)
Advisor: McCormick, Theresa
Commitee: Goforth, Andrea, Barbera, Jack
School: Portland State University
Department: Chemistry
School Location: United States -- Oregon
Source: MAI 81/6(E), Masters Abstracts International
Subjects: Chemistry
Keywords: Electrochemistry, Energy, Peroxide, Photocathode, Photochemistry, Tellurium
Publication Number: 13812446
ISBN: 9781392482285
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