Functionalized Cobalt Triarylcorrole Covalently Bonded with Graphene Oxide: A Selective Catalyst of the Two-or Four-Electron Reduction of Oxygen
Document Type
Article
Publication Date
8-7-2017
Department
Chemistry and Biochemistry
School
Mathematics and Natural Sciences
Abstract
A cobalt triphenylcorrole (CorCo) was covalently bonded to graphene oxide (GO), and the resulting product, represented as GO-CorCo, was characterized by UV–vis, FT-IR, and micro-Raman spectroscopy as well as by HRTEM, TGA, XRD, XPS, and AFM. The electrocatalytic activity of GO-CorCo toward the oxygen reduction reaction (ORR) was then examined in air-saturated 0.1 M KOH and 0.5 M H2SO4 solutions by cyclic voltammetry and linear sweep voltammetry using a rotating disk electrode and/or a rotating ring-disk electrode. An overall 4-electron reduction of O2 is obtained in alkaline media while under acidic conditions a 2-electron process is seen. The ORR results thus indicate that covalently bonded GO-CoCor can be used as a selective catalyst for either the 2- or 4-electron reduction of oxygen, the prevailing reaction depending upon the acidity of the solution.
Publication Title
Inorganic Chemistry
Volume
56
Issue
15
First Page
8954
Last Page
8963
Recommended Citation
Tang, J.,
Qu, Z.,
Guo, R.,
Fang, Y.,
Huang, D.,
Zhang, J.,
Guo, S.,
McFarland, F. M.,
Kadish, K. M.
(2017). Functionalized Cobalt Triarylcorrole Covalently Bonded with Graphene Oxide: A Selective Catalyst of the Two-or Four-Electron Reduction of Oxygen. Inorganic Chemistry, 56(15), 8954-8963.
Available at: https://aquila.usm.edu/fac_pubs/15245