A Route to Surface-bound Metalloporphyrins as Models for Oxygen Reduction Catalysts

Author

Stephen J. Van Wyck, University of VermontFollow

Date of Completion

2017

Document Type

Honors College Thesis

Department

Chemistry

Thesis Type

Honors College

First Advisor

William E. Geiger

Keywords

porphyrins, oxygen reduction, surface-bound

Abstract

The attachment nonmetal and magnesium ethynyl terminated porphyrin (TEPP and MgTEPP) to glassy carbon electrode was achieved through voltammetry. These attached porphyrins were studied by cyclic voltammetry (CV) and UV-visible spectroscopy. Surface-bound TEPP displayed reversible oxidation and reduction (E_1/2 = 0.52 V and E_1/2 = -1.74 V vs. ferrocene), and absorbance peak of 425 nm on indium tin oxide (ITO). While surface-bound MgTEPP possessed two reversible oxidations (E_1/2 = 0.61 V and E_1/2 = 0.97 V vs. Ag/AgCl) and an irreversible (E_pc = -1.65 V vs. Ag/AgCl). MgTEPP had an absorbance maximum at 431 nm on ITO. Both porphyrins had irreversible pre-waves, which could be regenerated. This is the first example of covalently-bound Mg porphyrin to an electrode surface.

Creative Commons License

This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

Recommended Citation

Van Wyck, Stephen J., "A Route to Surface-bound Metalloporphyrins as Models for Oxygen Reduction Catalysts" (2017). UVM Patrick Leahy Honors College Senior Theses. 179.
https://scholarworks.uvm.edu/hcoltheses/179