Keywords and Phrases
Biosensing; Electrochemistry; Metal Chalcogenides; Oxygen Evolution Reaction; Oxygen Reduction Reaction
"Generation of hydrogen and oxygen through catalyst-aided water splitting which has immense applications in metal air batteries, PEM fuel cells and solar to fuel energy production, has been one of the critical topics in recent times. The state of art oxygen evolution reaction (OER), oxygen reduction reaction (ORR), hydrogen evolution reaction (HER) catalysts are mostly comprised of precious metals. The current challenge lies in replacing these precious metal-based catalysts with non-precious earth-abundant materials without compromising catalytic efficiency.
This research explores mixed metal selenides containing Fe-Ni, Fe-Co and RhSe which were hydrothermally synthesized and/or electrodeposited and tested for OER and ORR catalytic activity in alkaline medium. This spinel class of compounds generically referred to as AB2Se4 where A and B are divalent and trivalent cations respectively. Interestingly, FeCo2Se4 and FeNi2Se4, both showed highly efficient catalytic activity with low overpotential. Increase in performance was observed when these two spinel compositions were mixed with conducting carbon matrix, which decreased the overpotential significantly and increased the stability.
Finally, the metal selenides were also applied towards electrochemical bio sensing of dopamine and glucose. Electrodeposited and hydrothermally synthesized CuSe was studied towards detection of ultralow concentrations of dopamine in neutral phosphate buffer solution. The electrodeposited CuSe was also active towards detection of glucose in alkaline electrolyte. CuSe showed low detection limit, high sensitivity and selectivity towards these biomolecules"--Abstract, page v.
Whitefield, Philip D.
Ph. D. in Chemistry
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Iron phosphide nanoparticles as an efficient electrocatalyst for OER in alkaline solution
- FeNi₂Se₄ - Reduced Graphene Oxide Nanocomposite: Enhancing Bifunctional Electrocatalytic Activity for Oxygen Evolution and Reduction through Synergistic Effects
- High efficiency electrochemical dopamine sensor based on transition metal selenides
- Nanostructured copper selenide as an ultrasensitive and selective non enzymatic glucose biosensor
- FeCo₂Se₄ - Functionalized onion like carbon as an efficient catalyst for oxygen evolution and oxygen reduction reaction
xvii, 205 pages
© 2020 Siddesh Umapathi, All rights reserved.
Dissertation - Open Access
Umapathi, Siddesh, "Transition metal chalcogenide hybrid systems as catalysts for energy conversion and biosensing" (2020). Doctoral Dissertations. 3044.